[ { "sku": "7300", "brand": "GENERIC-ISO", "series": "7300-series", "type": "angular_contact", "d_mm": 10, "D_mm": 35, "B_mm": 11, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 50, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7300-series (ISO 15 diameter series 3) the last two digits encode the bore: 7300 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6300 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "fans and blowers", "hand tool rotors", "small precision gearboxes", "instrument spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7300 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 73xx medium section gains axial and radial rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier balls also trade away speed versus a 7200 angular contact.", "Angular-contact 7300 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7300 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7300 angular-contact bearing?", "a": "A 7300 single-row angular-contact ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 50 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7300 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7300 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7300?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7300 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7300 compare with a deep-groove 6300?", "a": "Both share the 10×35×11 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7300 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6300." } ], "cross_ref": [ { "equiv_sku": "7300-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7300", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7000", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 10, "D_mm": 26, "B_mm": 8, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 18, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7000 carries bore code 00 = 10 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6000 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 10 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small precision gearboxes", "instrument spindles", "miniature pump rotors", "servo drive shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7000 fits a 10 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 10 mm bore uses a 26 mm OD; axial capacity is lower than a 7200, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7000 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7000 angular-contact bearing?", "a": "A 7000 single-row angular-contact ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 18 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7000 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7000 with code 00 has a 10 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7000?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7000 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7000 compare with a deep-groove 6000?", "a": "Both share the 10×26×8 mm ISO 15 envelope (8.0 mm radial section), but the angular-contact 7000 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6000." } ], "cross_ref": [ { "equiv_sku": "7000-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7000", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7001", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 12, "D_mm": 28, "B_mm": 8, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 21, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7001 carries bore code 01 = 12 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6001 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 12 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "instrument spindles", "miniature pump rotors", "servo drive shafts", "fans and blowers" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7001 fits a 12 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 12 mm bore uses a 28 mm OD; axial capacity is lower than a 7201, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7001 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7001 angular-contact bearing?", "a": "A 7001 single-row angular-contact ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 21 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7001 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7001 with code 01 has a 12 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7001?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7001 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7001 compare with a deep-groove 6001?", "a": "Both share the 12×28×8 mm ISO 15 envelope (8.0 mm radial section), but the angular-contact 7001 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6001." } ], "cross_ref": [ { "equiv_sku": "7001-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7001", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7002", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 15, "D_mm": 32, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 29, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7002 carries bore code 02 = 15 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6002 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 15 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "miniature pump rotors", "servo drive shafts", "fans and blowers", "hand tool rotors" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7002 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 15 mm bore uses a 32 mm OD; axial capacity is lower than a 7202, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7002 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7002 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7002 angular-contact bearing?", "a": "A 7002 single-row angular-contact ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 29 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7002 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7002 with code 02 has a 15 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7002?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7002 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7002 compare with a deep-groove 6002?", "a": "Both share the 15×32×9 mm ISO 15 envelope (8.5 mm radial section), but the angular-contact 7002 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6002." } ], "cross_ref": [ { "equiv_sku": "7002-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7002", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7003", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 17, "D_mm": 35, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 38, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7003 carries bore code 03 = 17 mm. Codes 00–03 follow the 10/12/15/17 mm exception table rather than code × 5. Outside diameter 35 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6003 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 17 mm shaft, specify a j5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo drive shafts", "fans and blowers", "hand tool rotors", "small precision gearboxes" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Bore codes 00–03 use the exception table: 7003 fits a 17 mm shaft — the code × 5 mnemonic does not apply below code 04.", "The 70xx extra-light section at 17 mm bore uses a 35 mm OD; axial capacity is lower than a 7203, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7003 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7003 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7003 angular-contact bearing?", "a": "A 7003 single-row angular-contact ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 38 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "Why does 7003 not follow the bore-code × 5 rule?", "a": "Codes 00–03 use the exception table (10, 12, 15 and 17 mm): 7003 with code 03 has a 17 mm bore. The code × 5 convention starts at code 04 (20 mm)." }, { "q": "What is the contact angle of 7003?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7003 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7003 compare with a deep-groove 6003?", "a": "Both share the 17×35×10 mm ISO 15 envelope (9.0 mm radial section), but the angular-contact 7003 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6003." } ], "cross_ref": [ { "equiv_sku": "7003-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7003", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7004", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 20, "D_mm": 42, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 66, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7004 carries bore code 04 = 20 mm. Outside diameter 42 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6004 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 20 mm bore uses a 42 mm OD; axial capacity is lower than a 7204, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7004 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7004 where a deep-groove 6004 would do: same 20×42×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7004 angular-contact bearing?", "a": "A 7004 single-row angular-contact ball bearing has a 20 mm bore, 42 mm outer diameter and 12 mm width (0.787 × 1.654 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 66 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7004 bore code work?", "a": "The last two digits of 7004 are bore code 04, giving 04 × 5 = 20 mm bore. The 42 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 6004 deep-groove envelope." }, { "q": "What is the contact angle of 7004?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7004 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7004 compare with a deep-groove 6004?", "a": "Both share the 20×42×12 mm ISO 15 envelope (11.0 mm radial section), but the angular-contact 7004 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6004." } ], "cross_ref": [ { "equiv_sku": "7004-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7005", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 25, "D_mm": 47, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 76, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7005 carries bore code 05 = 25 mm. Outside diameter 47 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6005 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 25 mm bore uses a 47 mm OD; axial capacity is lower than a 7205, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7005 where a deep-groove 6005 would do: same 25×47×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7005 angular-contact bearing?", "a": "A 7005 single-row angular-contact ball bearing has a 25 mm bore, 47 mm outer diameter and 12 mm width (0.984 × 1.85 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 76 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7005 bore code work?", "a": "The last two digits of 7005 are bore code 05, giving 05 × 5 = 25 mm bore. The 47 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 6005 deep-groove envelope." }, { "q": "What is the contact angle of 7005?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7005 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7005 compare with a deep-groove 6005?", "a": "Both share the 25×47×12 mm ISO 15 envelope (11.0 mm radial section), but the angular-contact 7005 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6005." } ], "cross_ref": [ { "equiv_sku": "7005-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7006", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 30, "D_mm": 55, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 111, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7006 carries bore code 06 = 30 mm. Outside diameter 55 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6006 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 30 mm bore uses a 55 mm OD; axial capacity is lower than a 7206, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7006 angular-contact bearing?", "a": "A 7006 single-row angular-contact ball bearing has a 30 mm bore, 55 mm outer diameter and 13 mm width (1.181 × 2.165 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 111 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7006 bore code work?", "a": "The last two digits of 7006 are bore code 06, giving 06 × 5 = 30 mm bore. The 55 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 6006 deep-groove envelope." }, { "q": "What is the contact angle of 7006?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7006 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7006 compare with a deep-groove 6006?", "a": "Both share the 30×55×13 mm ISO 15 envelope (12.5 mm radial section), but the angular-contact 7006 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6006." } ], "cross_ref": [ { "equiv_sku": "7006-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7007", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 35, "D_mm": 62, "B_mm": 14, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 147, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7007 carries bore code 07 = 35 mm. Outside diameter 62 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6007 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 35 mm bore uses a 62 mm OD; axial capacity is lower than a 7207, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7007 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7007 angular-contact bearing?", "a": "A 7007 single-row angular-contact ball bearing has a 35 mm bore, 62 mm outer diameter and 14 mm width (1.378 × 2.441 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 147 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7007 bore code work?", "a": "The last two digits of 7007 are bore code 07, giving 07 × 5 = 35 mm bore. The 62 mm outside diameter and 14 mm width follow the ISO 15 diameter series, shared with the 6007 deep-groove envelope." }, { "q": "What is the contact angle of 7007?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7007 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7007 compare with a deep-groove 6007?", "a": "Both share the 35×62×14 mm ISO 15 envelope (13.5 mm radial section), but the angular-contact 7007 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6007." } ], "cross_ref": [ { "equiv_sku": "7007-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7008", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 40, "D_mm": 68, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 182, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7008 carries bore code 08 = 40 mm. Outside diameter 68 mm and width 15 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6008 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 40 mm bore uses a 68 mm OD; axial capacity is lower than a 7208, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7008 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7008 angular-contact bearing?", "a": "A 7008 single-row angular-contact ball bearing has a 40 mm bore, 68 mm outer diameter and 15 mm width (1.575 × 2.677 × 0.591 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 182 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7008 bore code work?", "a": "The last two digits of 7008 are bore code 08, giving 08 × 5 = 40 mm bore. The 68 mm outside diameter and 15 mm width follow the ISO 15 diameter series, shared with the 6008 deep-groove envelope." }, { "q": "What is the contact angle of 7008?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7008 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7008 compare with a deep-groove 6008?", "a": "Both share the 40×68×15 mm ISO 15 envelope (14.0 mm radial section), but the angular-contact 7008 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6008." } ], "cross_ref": [ { "equiv_sku": "7008-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7009", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 45, "D_mm": 75, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 231, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7009 carries bore code 09 = 45 mm. Outside diameter 75 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6009 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 70xx extra-light section at 45 mm bore uses a 75 mm OD; axial capacity is lower than a 7209, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7009 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7009 angular-contact bearing?", "a": "A 7009 single-row angular-contact ball bearing has a 45 mm bore, 75 mm outer diameter and 16 mm width (1.772 × 2.953 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 231 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7009 bore code work?", "a": "The last two digits of 7009 are bore code 09, giving 09 × 5 = 45 mm bore. The 75 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6009 deep-groove envelope." }, { "q": "What is the contact angle of 7009?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7009 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7009 compare with a deep-groove 6009?", "a": "Both share the 45×75×16 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7009 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6009." } ], "cross_ref": [ { "equiv_sku": "7009-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7010", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 50, "D_mm": 80, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 250, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7010 carries bore code 10 = 50 mm. Outside diameter 80 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6010 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 50 mm bore uses a 80 mm OD; axial capacity is lower than a 7210, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7010 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7010 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7010 angular-contact bearing?", "a": "A 7010 single-row angular-contact ball bearing has a 50 mm bore, 80 mm outer diameter and 16 mm width (1.969 × 3.15 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 250 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7010 bore code work?", "a": "The last two digits of 7010 are bore code 10, giving 10 × 5 = 50 mm bore. The 80 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 6010 deep-groove envelope." }, { "q": "What is the contact angle of 7010?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7010 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7010 compare with a deep-groove 6010?", "a": "Both share the 50×80×16 mm ISO 15 envelope (15.0 mm radial section), but the angular-contact 7010 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6010." } ], "cross_ref": [ { "equiv_sku": "7010-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7011", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 55, "D_mm": 90, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 366, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7011 carries bore code 11 = 55 mm. Outside diameter 90 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6011 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 55 mm bore uses a 90 mm OD; axial capacity is lower than a 7211, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7011 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7011 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7011 angular-contact bearing?", "a": "A 7011 single-row angular-contact ball bearing has a 55 mm bore, 90 mm outer diameter and 18 mm width (2.165 × 3.543 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 366 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7011 bore code work?", "a": "The last two digits of 7011 are bore code 11, giving 11 × 5 = 55 mm bore. The 90 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6011 deep-groove envelope." }, { "q": "What is the contact angle of 7011?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7011 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7011 compare with a deep-groove 6011?", "a": "Both share the 55×90×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7011 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6011." } ], "cross_ref": [ { "equiv_sku": "7011-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7012", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 60, "D_mm": 95, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 391, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7012 carries bore code 12 = 60 mm. Outside diameter 95 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6012 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 60 mm bore uses a 95 mm OD; axial capacity is lower than a 7212, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7012 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7012 where a deep-groove 6012 would do: same 60×95×18 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7012 angular-contact bearing?", "a": "A 7012 single-row angular-contact ball bearing has a 60 mm bore, 95 mm outer diameter and 18 mm width (2.362 × 3.74 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 391 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7012 bore code work?", "a": "The last two digits of 7012 are bore code 12, giving 12 × 5 = 60 mm bore. The 95 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6012 deep-groove envelope." }, { "q": "What is the contact angle of 7012?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7012 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7012 compare with a deep-groove 6012?", "a": "Both share the 60×95×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7012 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6012." } ], "cross_ref": [ { "equiv_sku": "7012-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7013", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 65, "D_mm": 100, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 417, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7013 carries bore code 13 = 65 mm. Outside diameter 100 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6013 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 65 mm bore uses a 100 mm OD; axial capacity is lower than a 7213, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7013 where a deep-groove 6013 would do: same 65×100×18 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7013 angular-contact bearing?", "a": "A 7013 single-row angular-contact ball bearing has a 65 mm bore, 100 mm outer diameter and 18 mm width (2.559 × 3.937 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 417 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7013 bore code work?", "a": "The last two digits of 7013 are bore code 13, giving 13 × 5 = 65 mm bore. The 100 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 6013 deep-groove envelope." }, { "q": "What is the contact angle of 7013?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7013 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7013 compare with a deep-groove 6013?", "a": "Both share the 65×100×18 mm ISO 15 envelope (17.5 mm radial section), but the angular-contact 7013 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6013." } ], "cross_ref": [ { "equiv_sku": "7013-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7014", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 70, "D_mm": 110, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 577, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7014 carries bore code 14 = 70 mm. Outside diameter 110 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6014 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 70 mm bore uses a 110 mm OD; axial capacity is lower than a 7214, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 20 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7014 angular-contact bearing?", "a": "A 7014 single-row angular-contact ball bearing has a 70 mm bore, 110 mm outer diameter and 20 mm width (2.756 × 4.331 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 577 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7014 bore code work?", "a": "The last two digits of 7014 are bore code 14, giving 14 × 5 = 70 mm bore. The 110 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6014 deep-groove envelope." }, { "q": "What is the contact angle of 7014?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7014 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7014 compare with a deep-groove 6014?", "a": "Both share the 70×110×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7014 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6014." } ], "cross_ref": [ { "equiv_sku": "7014-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7015", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 75, "D_mm": 115, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 609, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7015 carries bore code 15 = 75 mm. Outside diameter 115 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6015 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gearbox output shafts", "printing and textile machinery", "medium motor drives", "machine tool spindles" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 70xx extra-light section at 75 mm bore uses a 115 mm OD; axial capacity is lower than a 7215, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7015 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7015 angular-contact bearing?", "a": "A 7015 single-row angular-contact ball bearing has a 75 mm bore, 115 mm outer diameter and 20 mm width (2.953 × 4.528 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 609 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7015 bore code work?", "a": "The last two digits of 7015 are bore code 15, giving 15 × 5 = 75 mm bore. The 115 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 6015 deep-groove envelope." }, { "q": "What is the contact angle of 7015?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7015 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7015 compare with a deep-groove 6015?", "a": "Both share the 75×115×20 mm ISO 15 envelope (20.0 mm radial section), but the angular-contact 7015 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6015." } ], "cross_ref": [ { "equiv_sku": "7015-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7016", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 80, "D_mm": 125, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 813, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7016 carries bore code 16 = 80 mm. Outside diameter 125 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6016 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 80 mm bore uses a 125 mm OD; axial capacity is lower than a 7216, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "A single 7016 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7016 angular-contact bearing?", "a": "A 7016 single-row angular-contact ball bearing has a 80 mm bore, 125 mm outer diameter and 22 mm width (3.15 × 4.921 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 813 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7016 bore code work?", "a": "The last two digits of 7016 are bore code 16, giving 16 × 5 = 80 mm bore. The 125 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6016 deep-groove envelope." }, { "q": "What is the contact angle of 7016?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7016 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7016 compare with a deep-groove 6016?", "a": "Both share the 80×125×22 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7016 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6016." } ], "cross_ref": [ { "equiv_sku": "7016-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7017", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 85, "D_mm": 130, "B_mm": 22, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 853, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7017 carries bore code 17 = 85 mm. Outside diameter 130 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6017 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 85 mm bore uses a 130 mm OD; axial capacity is lower than a 7217, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7017 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7017 angular-contact bearing?", "a": "A 7017 single-row angular-contact ball bearing has a 85 mm bore, 130 mm outer diameter and 22 mm width (3.346 × 5.118 × 0.866 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 853 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7017 bore code work?", "a": "The last two digits of 7017 are bore code 17, giving 17 × 5 = 85 mm bore. The 130 mm outside diameter and 22 mm width follow the ISO 15 diameter series, shared with the 6017 deep-groove envelope." }, { "q": "What is the contact angle of 7017?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7017 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7017 compare with a deep-groove 6017?", "a": "Both share the 85×130×22 mm ISO 15 envelope (22.5 mm radial section), but the angular-contact 7017 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6017." } ], "cross_ref": [ { "equiv_sku": "7017-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7018", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 90, "D_mm": 140, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1106, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7018 carries bore code 18 = 90 mm. Outside diameter 140 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6018 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "heavy machine tool spindles", "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 90 mm bore uses a 140 mm OD; axial capacity is lower than a 7218, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Angular-contact 7018 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7018 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7018 angular-contact bearing?", "a": "A 7018 single-row angular-contact ball bearing has a 90 mm bore, 140 mm outer diameter and 24 mm width (3.543 × 5.512 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1106 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7018 bore code work?", "a": "The last two digits of 7018 are bore code 18, giving 18 × 5 = 90 mm bore. The 140 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6018 deep-groove envelope." }, { "q": "What is the contact angle of 7018?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7018 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7018 compare with a deep-groove 6018?", "a": "Both share the 90×140×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7018 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6018." } ], "cross_ref": [ { "equiv_sku": "7018-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7019", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 95, "D_mm": 145, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1154, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7019 carries bore code 19 = 95 mm. Outside diameter 145 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6019 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "large gearboxes and reducers", "mill and crane drives", "pulp and paper machinery", "cement and mining drives" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 95 mm bore uses a 145 mm OD; axial capacity is lower than a 7219, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Preload class matters: a 7019 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7019 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7019 angular-contact bearing?", "a": "A 7019 single-row angular-contact ball bearing has a 95 mm bore, 145 mm outer diameter and 24 mm width (3.74 × 5.709 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1154 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7019 bore code work?", "a": "The last two digits of 7019 are bore code 19, giving 19 × 5 = 95 mm bore. The 145 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6019 deep-groove envelope." }, { "q": "What is the contact angle of 7019?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7019 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7019 compare with a deep-groove 6019?", "a": "Both share the 95×145×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7019 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6019." } ], "cross_ref": [ { "equiv_sku": "7019-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7020", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 100, "D_mm": 150, "B_mm": 24, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1202, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7020 carries bore code 20 = 100 mm. Outside diameter 150 mm and width 24 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6020 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "mill and crane drives", "pulp and paper machinery", "cement and mining drives", "power transmission shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 100 mm bore uses a 150 mm OD; axial capacity is lower than a 7220, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7020 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7020 where a deep-groove 6020 would do: same 100×150×24 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7020 angular-contact bearing?", "a": "A 7020 single-row angular-contact ball bearing has a 100 mm bore, 150 mm outer diameter and 24 mm width (3.937 × 5.906 × 0.945 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1202 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7020 bore code work?", "a": "The last two digits of 7020 are bore code 20, giving 20 × 5 = 100 mm bore. The 150 mm outside diameter and 24 mm width follow the ISO 15 diameter series, shared with the 6020 deep-groove envelope." }, { "q": "What is the contact angle of 7020?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7020 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7020 compare with a deep-groove 6020?", "a": "Both share the 100×150×24 mm ISO 15 envelope (25.0 mm radial section), but the angular-contact 7020 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6020." } ], "cross_ref": [ { "equiv_sku": "7020-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7021", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 105, "D_mm": 160, "B_mm": 26, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1519, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7021 carries bore code 21 = 105 mm. Outside diameter 160 mm and width 26 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6021 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 105 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pulp and paper machinery", "cement and mining drives", "power transmission shafts", "heavy machine tool spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 105 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 105 mm bore uses a 160 mm OD; axial capacity is lower than a 7221, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Do not run a single 7021 where a deep-groove 6021 would do: same 105×160×26 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 26 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7021 angular-contact bearing?", "a": "A 7021 single-row angular-contact ball bearing has a 105 mm bore, 160 mm outer diameter and 26 mm width (4.134 × 6.299 × 1.024 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1519 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7021 bore code work?", "a": "The last two digits of 7021 are bore code 21, giving 21 × 5 = 105 mm bore. The 160 mm outside diameter and 26 mm width follow the ISO 15 diameter series, shared with the 6021 deep-groove envelope." }, { "q": "What is the contact angle of 7021?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7021 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7021 compare with a deep-groove 6021?", "a": "Both share the 105×160×26 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7021 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6021." } ], "cross_ref": [ { "equiv_sku": "7021-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7022", "brand": "GENERIC-ISO", "series": "7000-series", "type": "angular_contact", "d_mm": 110, "D_mm": 170, "B_mm": 28, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1885, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7000-series (ISO 15 diameter series 0) the last two digits encode the bore: 7022 carries bore code 22 = 110 mm. Outside diameter 170 mm and width 28 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6022 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 110 mm shaft, specify a m6 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "cement and mining drives", "power transmission shafts", "heavy machine tool spindles", "large gearboxes and reducers" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 110 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 70xx extra-light section at 110 mm bore uses a 170 mm OD; axial capacity is lower than a 7222, so do not substitute a failed 72-series spindle bearing with a 70 without re-rating the thrust.", "Shaft and housing fillets must clear the bearing chamfer so the 28 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7022 angular-contact bearing?", "a": "A 7022 single-row angular-contact ball bearing has a 110 mm bore, 170 mm outer diameter and 28 mm width (4.331 × 6.693 × 1.102 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1885 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7022 bore code work?", "a": "The last two digits of 7022 are bore code 22, giving 22 × 5 = 110 mm bore. The 170 mm outside diameter and 28 mm width follow the ISO 15 diameter series, shared with the 6022 deep-groove envelope." }, { "q": "What is the contact angle of 7022?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7022 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7022 compare with a deep-groove 6022?", "a": "Both share the 110×170×28 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7022 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6022." } ], "cross_ref": [ { "equiv_sku": "7022-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "7022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7404", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 20, "D_mm": 72, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 364, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7404 carries bore code 04 = 20 mm. Outside diameter 72 mm and width 19 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6404 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 20 mm bore (72 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7404 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7404 angular-contact bearing?", "a": "A 7404 single-row angular-contact ball bearing has a 20 mm bore, 72 mm outer diameter and 19 mm width (0.787 × 2.835 × 0.748 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 364 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7404 bore code work?", "a": "The last two digits of 7404 are bore code 04, giving 04 × 5 = 20 mm bore. The 72 mm outside diameter and 19 mm width follow the ISO 15 diameter series, shared with the 6404 deep-groove envelope." }, { "q": "What is the contact angle of 7404?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7404 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7404 compare with a deep-groove 6404?", "a": "Both share the 20×72×19 mm ISO 15 envelope (26.0 mm radial section), but the angular-contact 7404 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6404." } ], "cross_ref": [ { "equiv_sku": "7404", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7405", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 25, "D_mm": 80, "B_mm": 21, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 486, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7405 carries bore code 05 = 25 mm. Outside diameter 80 mm and width 21 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6405 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "conveyor head pulleys", "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 25 mm bore (80 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "A single 7405 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7405 angular-contact bearing?", "a": "A 7405 single-row angular-contact ball bearing has a 25 mm bore, 80 mm outer diameter and 21 mm width (0.984 × 3.15 × 0.827 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 486 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7405 bore code work?", "a": "The last two digits of 7405 are bore code 05, giving 05 × 5 = 25 mm bore. The 80 mm outside diameter and 21 mm width follow the ISO 15 diameter series, shared with the 6405 deep-groove envelope." }, { "q": "What is the contact angle of 7405?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7405 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7405 compare with a deep-groove 6405?", "a": "Both share the 25×80×21 mm ISO 15 envelope (27.5 mm radial section), but the angular-contact 7405 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6405." } ], "cross_ref": [ { "equiv_sku": "7405", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7406", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 30, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 664, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7406 carries bore code 06 = 30 mm. Outside diameter 90 mm and width 23 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6406 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "pump and compressor shafts", "small machine tool spindles", "servo and stepper drives", "gear reducers" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 30 mm bore (90 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7406 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7406 angular-contact bearing?", "a": "A 7406 single-row angular-contact ball bearing has a 30 mm bore, 90 mm outer diameter and 23 mm width (1.181 × 3.543 × 0.906 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 664 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7406 bore code work?", "a": "The last two digits of 7406 are bore code 06, giving 06 × 5 = 30 mm bore. The 90 mm outside diameter and 23 mm width follow the ISO 15 diameter series, shared with the 6406 deep-groove envelope." }, { "q": "What is the contact angle of 7406?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7406 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7406 compare with a deep-groove 6406?", "a": "Both share the 30×90×23 mm ISO 15 envelope (30.0 mm radial section), but the angular-contact 7406 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6406." } ], "cross_ref": [ { "equiv_sku": "7406", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7407", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 35, "D_mm": 100, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 879, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7407 carries bore code 07 = 35 mm. Outside diameter 100 mm and width 25 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6407 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "small machine tool spindles", "servo and stepper drives", "gear reducers", "electric motor shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 35 mm bore (100 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Angular-contact 7407 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 7407 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 7407 angular-contact bearing?", "a": "A 7407 single-row angular-contact ball bearing has a 35 mm bore, 100 mm outer diameter and 25 mm width (1.378 × 3.937 × 0.984 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 879 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7407 bore code work?", "a": "The last two digits of 7407 are bore code 07, giving 07 × 5 = 35 mm bore. The 100 mm outside diameter and 25 mm width follow the ISO 15 diameter series, shared with the 6407 deep-groove envelope." }, { "q": "What is the contact angle of 7407?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7407 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7407 compare with a deep-groove 6407?", "a": "Both share the 35×100×25 mm ISO 15 envelope (32.5 mm radial section), but the angular-contact 7407 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6407." } ], "cross_ref": [ { "equiv_sku": "7407", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7408", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 40, "D_mm": 110, "B_mm": 27, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7408 carries bore code 08 = 40 mm. Outside diameter 110 mm and width 27 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6408 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "servo and stepper drives", "gear reducers", "electric motor shafts", "conveyor head pulleys" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 40 mm bore (110 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Preload class matters: a 7408 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7408 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 7408 angular-contact bearing?", "a": "A 7408 single-row angular-contact ball bearing has a 40 mm bore, 110 mm outer diameter and 27 mm width (1.575 × 4.331 × 1.063 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7408 bore code work?", "a": "The last two digits of 7408 are bore code 08, giving 08 × 5 = 40 mm bore. The 110 mm outside diameter and 27 mm width follow the ISO 15 diameter series, shared with the 6408 deep-groove envelope." }, { "q": "What is the contact angle of 7408?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7408 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7408 compare with a deep-groove 6408?", "a": "Both share the 40×110×27 mm ISO 15 envelope (35.0 mm radial section), but the angular-contact 7408 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6408." } ], "cross_ref": [ { "equiv_sku": "7408", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7409", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 45, "D_mm": 120, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1438, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7409 carries bore code 09 = 45 mm. Outside diameter 120 mm and width 29 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6409 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "gear reducers", "electric motor shafts", "conveyor head pulleys", "pump and compressor shafts" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 74xx heavy section at 45 mm bore (120 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 7409 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 7409 where a deep-groove 6409 would do: same 45×120×29 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 7409 angular-contact bearing?", "a": "A 7409 single-row angular-contact ball bearing has a 45 mm bore, 120 mm outer diameter and 29 mm width (1.772 × 4.724 × 1.142 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1438 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7409 bore code work?", "a": "The last two digits of 7409 are bore code 09, giving 09 × 5 = 45 mm bore. The 120 mm outside diameter and 29 mm width follow the ISO 15 diameter series, shared with the 6409 deep-groove envelope." }, { "q": "What is the contact angle of 7409?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7409 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7409 compare with a deep-groove 6409?", "a": "Both share the 45×120×29 mm ISO 15 envelope (37.5 mm radial section), but the angular-contact 7409 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6409." } ], "cross_ref": [ { "equiv_sku": "7409", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7410", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 50, "D_mm": 130, "B_mm": 31, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 1789, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7410 carries bore code 10 = 50 mm. Outside diameter 130 mm and width 31 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6410 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "printing and textile machinery", "medium motor drives", "machine tool spindles", "centrifugal pumps" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 50 mm bore (130 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Do not run a single 7410 where a deep-groove 6410 would do: same 50×130×31 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 7410 angular-contact bearing?", "a": "A 7410 single-row angular-contact ball bearing has a 50 mm bore, 130 mm outer diameter and 31 mm width (1.969 × 5.118 × 1.22 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 1789 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7410 bore code work?", "a": "The last two digits of 7410 are bore code 10, giving 10 × 5 = 50 mm bore. The 130 mm outside diameter and 31 mm width follow the ISO 15 diameter series, shared with the 6410 deep-groove envelope." }, { "q": "What is the contact angle of 7410?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7410 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7410 compare with a deep-groove 6410?", "a": "Both share the 50×130×31 mm ISO 15 envelope (40.0 mm radial section), but the angular-contact 7410 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6410." } ], "cross_ref": [ { "equiv_sku": "7410", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7411", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 55, "D_mm": 140, "B_mm": 33, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2192, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7411 carries bore code 11 = 55 mm. Outside diameter 140 mm and width 33 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6411 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medium motor drives", "machine tool spindles", "centrifugal pumps", "industrial compressors" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 55 mm bore (140 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Shaft and housing fillets must clear the bearing chamfer so the 33 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 7411 angular-contact bearing?", "a": "A 7411 single-row angular-contact ball bearing has a 55 mm bore, 140 mm outer diameter and 33 mm width (2.165 × 5.512 × 1.299 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2192 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7411 bore code work?", "a": "The last two digits of 7411 are bore code 11, giving 11 × 5 = 55 mm bore. The 140 mm outside diameter and 33 mm width follow the ISO 15 diameter series, shared with the 6411 deep-groove envelope." }, { "q": "What is the contact angle of 7411?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7411 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7411 compare with a deep-groove 6411?", "a": "Both share the 55×140×33 mm ISO 15 envelope (42.5 mm radial section), but the angular-contact 7411 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6411." } ], "cross_ref": [ { "equiv_sku": "7411", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7412", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 60, "D_mm": 150, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 2651, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7412 carries bore code 12 = 60 mm. Outside diameter 150 mm and width 35 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6412 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "machine tool spindles", "centrifugal pumps", "industrial compressors", "gearbox output shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 60 mm bore (150 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 7412 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 7412 angular-contact bearing?", "a": "A 7412 single-row angular-contact ball bearing has a 60 mm bore, 150 mm outer diameter and 35 mm width (2.362 × 5.906 × 1.378 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 2651 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7412 bore code work?", "a": "The last two digits of 7412 are bore code 12, giving 12 × 5 = 60 mm bore. The 150 mm outside diameter and 35 mm width follow the ISO 15 diameter series, shared with the 6412 deep-groove envelope." }, { "q": "What is the contact angle of 7412?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7412 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7412 compare with a deep-groove 6412?", "a": "Both share the 60×150×35 mm ISO 15 envelope (45.0 mm radial section), but the angular-contact 7412 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6412." } ], "cross_ref": [ { "equiv_sku": "7412", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7413", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 65, "D_mm": 160, "B_mm": 37, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 3169, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7413 carries bore code 13 = 65 mm. Outside diameter 160 mm and width 37 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6413 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "centrifugal pumps", "industrial compressors", "gearbox output shafts", "printing and textile machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 65 mm bore (160 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "A single 7413 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 7413 angular-contact bearing?", "a": "A 7413 single-row angular-contact ball bearing has a 65 mm bore, 160 mm outer diameter and 37 mm width (2.559 × 6.299 × 1.457 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 3169 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7413 bore code work?", "a": "The last two digits of 7413 are bore code 13, giving 13 × 5 = 65 mm bore. The 160 mm outside diameter and 37 mm width follow the ISO 15 diameter series, shared with the 6413 deep-groove envelope." }, { "q": "What is the contact angle of 7413?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7413 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7413 compare with a deep-groove 6413?", "a": "Both share the 65×160×37 mm ISO 15 envelope (47.5 mm radial section), but the angular-contact 7413 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6413." } ], "cross_ref": [ { "equiv_sku": "7413", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "7414", "brand": "GENERIC-ISO", "series": "7400-series", "type": "angular_contact", "d_mm": 70, "D_mm": 180, "B_mm": 42, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 4629, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 7400-series (ISO 15 diameter series 4) the last two digits encode the bore: 7414 carries bore code 14 = 70 mm. Outside diameter 180 mm and width 42 mm come from the ISO 15 boundary-dimensions general plan, shared with the 6414 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "industrial compressors", "gearbox output shafts", "printing and textile machinery", "medium motor drives" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 74xx heavy section at 70 mm bore (180 mm OD) is built for high combined load at lower speed; specifying it in a high-rpm spindle gives excess heat and short grease life — use 72/73 there.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 7414 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 7414 angular-contact bearing?", "a": "A 7414 single-row angular-contact ball bearing has a 70 mm bore, 180 mm outer diameter and 42 mm width (2.756 × 7.087 × 1.654 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 4629 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 7414 bore code work?", "a": "The last two digits of 7414 are bore code 14, giving 14 × 5 = 70 mm bore. The 180 mm outside diameter and 42 mm width follow the ISO 15 diameter series, shared with the 6414 deep-groove envelope." }, { "q": "What is the contact angle of 7414?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 7414 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How does 7414 compare with a deep-groove 6414?", "a": "Both share the 70×180×42 mm ISO 15 envelope (55.0 mm radial section), but the angular-contact 7414 has an asymmetric raceway and 40° contact angle: it carries higher combined axial+radial load and runs with controlled preload, but is slower, noisier and needs pairing — it is not a drop-in replacement for a deep-groove 6414." } ], "cross_ref": [ { "equiv_sku": "7414", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71804", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 20, "D_mm": 32, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 18, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71804 carries bore code 04 = 20 mm. Outside diameter 32 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61804 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 20 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7204.", "With a 6.0 mm radial section on a 20 mm bore, the 71804 ring has little stiffness of its own: it copies the seat geometry, so grind the 20 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 32 mm housing.", "A single 71804 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71804 angular-contact bearing?", "a": "A 71804 single-row angular-contact ball bearing has a 20 mm bore, 32 mm outer diameter and 7 mm width (0.787 × 1.26 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 18 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71804 bore code work?", "a": "The last two digits of 71804 are bore code 04, giving 04 × 5 = 20 mm bore. The 32 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61804 deep-groove envelope." }, { "q": "What is the contact angle of 71804?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71804 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71804?", "a": "On a 20 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 6.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71804", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71805", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 25, "D_mm": 37, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 21, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71805 carries bore code 05 = 25 mm. Outside diameter 37 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61805 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 25 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7205.", "Draw-up on a thin-section 71805 is lighter than on a 72/73 bearing of the same bore: a 7 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71805 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71805 angular-contact bearing?", "a": "A 71805 single-row angular-contact ball bearing has a 25 mm bore, 37 mm outer diameter and 7 mm width (0.984 × 1.457 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 21 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71805 bore code work?", "a": "The last two digits of 71805 are bore code 05, giving 05 × 5 = 25 mm bore. The 37 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61805 deep-groove envelope." }, { "q": "What is the contact angle of 71805?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71805 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71805 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 6.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 25 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71805", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71806", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 30, "D_mm": 42, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 24, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71806 carries bore code 06 = 30 mm. Outside diameter 42 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61806 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 30 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7206.", "The 42 mm outer ring of 71806 is only 6.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 7 mm-wide raceway long before the load rating is reached.", "Angular-contact 71806 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71806 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71806 angular-contact bearing?", "a": "A 71806 single-row angular-contact ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 24 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71806 bore code work?", "a": "The last two digits of 71806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61806 deep-groove envelope." }, { "q": "What is the contact angle of 71806?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71806 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71806 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 30 mm bore the 71806 envelope is 30×42×7 mm with a 6.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71806", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71807", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 35, "D_mm": 47, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 28, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71807 carries bore code 07 = 35 mm. Outside diameter 47 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61807 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 35 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7207.", "Pair thin-section 71807 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 6.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 35 mm spindle seat.", "Preload class matters: a 71807 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71807 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71807 angular-contact bearing?", "a": "A 71807 single-row angular-contact ball bearing has a 35 mm bore, 47 mm outer diameter and 7 mm width (1.378 × 1.85 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 28 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71807 bore code work?", "a": "The last two digits of 71807 are bore code 07, giving 07 × 5 = 35 mm bore. The 47 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61807 deep-groove envelope." }, { "q": "What is the contact angle of 71807?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71807 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71807?", "a": "On a 35 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 6.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71807", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71808", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 40, "D_mm": 52, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 31, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71808 carries bore code 08 = 40 mm. Outside diameter 52 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61808 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 40 mm bore has only a 6.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7208.", "With a 6.0 mm radial section on a 40 mm bore, the 71808 ring has little stiffness of its own: it copies the seat geometry, so grind the 40 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 52 mm housing.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71808 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71808 where a deep-groove 61808 would do: same 40×52×7 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71808 angular-contact bearing?", "a": "A 71808 single-row angular-contact ball bearing has a 40 mm bore, 52 mm outer diameter and 7 mm width (1.575 × 2.047 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 31 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71808 bore code work?", "a": "The last two digits of 71808 are bore code 08, giving 08 × 5 = 40 mm bore. The 52 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61808 deep-groove envelope." }, { "q": "What is the contact angle of 71808?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71808 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71808 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 6.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 40 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71808", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71809", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 45, "D_mm": 58, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 38, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61809 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 718xx thin section at 45 mm bore has only a 6.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7209.", "Draw-up on a thin-section 71809 is lighter than on a 72/73 bearing of the same bore: a 7 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Do not run a single 71809 where a deep-groove 61809 would do: same 45×58×7 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71809 angular-contact bearing?", "a": "A 71809 single-row angular-contact ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 38 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71809 bore code work?", "a": "The last two digits of 71809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61809 deep-groove envelope." }, { "q": "What is the contact angle of 71809?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71809 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71809 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 45 mm bore the 71809 envelope is 45×58×7 mm with a 6.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71809", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71810", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 50, "D_mm": 65, "B_mm": 7, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 48, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71810 carries bore code 10 = 50 mm. Outside diameter 65 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61810 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7210.", "The 65 mm outer ring of 71810 is only 7.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 7 mm-wide raceway long before the load rating is reached.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71810 angular-contact bearing?", "a": "A 71810 single-row angular-contact ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 48 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71810 bore code work?", "a": "The last two digits of 71810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, shared with the 61810 deep-groove envelope." }, { "q": "What is the contact angle of 71810?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71810 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71810?", "a": "On a 50 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 7 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 7.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71810", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71811", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 55, "D_mm": 72, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 78, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71811 carries bore code 11 = 55 mm. Outside diameter 72 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61811 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 55 mm bore has only a 8.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7211.", "Pair thin-section 71811 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 8.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 55 mm spindle seat.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71811 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71811 angular-contact bearing?", "a": "A 71811 single-row angular-contact ball bearing has a 55 mm bore, 72 mm outer diameter and 9 mm width (2.165 × 2.835 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 78 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71811 bore code work?", "a": "The last two digits of 71811 are bore code 11, giving 11 × 5 = 55 mm bore. The 72 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61811 deep-groove envelope." }, { "q": "What is the contact angle of 71811?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71811 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71811 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 8.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 55 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71811", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71812", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 60, "D_mm": 78, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 100, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71812 carries bore code 12 = 60 mm. Outside diameter 78 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61812 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 60 mm bore has only a 9.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7212.", "With a 9.0 mm radial section on a 60 mm bore, the 71812 ring has little stiffness of its own: it copies the seat geometry, so grind the 60 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 78 mm housing.", "A single 71812 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71812 angular-contact bearing?", "a": "A 71812 single-row angular-contact ball bearing has a 60 mm bore, 78 mm outer diameter and 10 mm width (2.362 × 3.071 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 100 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71812 bore code work?", "a": "The last two digits of 71812 are bore code 12, giving 12 × 5 = 60 mm bore. The 78 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61812 deep-groove envelope." }, { "q": "What is the contact angle of 71812?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71812 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71812 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 60 mm bore the 71812 envelope is 60×78×10 mm with a 9.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71812", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71813", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 65, "D_mm": 85, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 120, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71813 carries bore code 13 = 65 mm. Outside diameter 85 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61813 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 65 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7213.", "Draw-up on a thin-section 71813 is lighter than on a 72/73 bearing of the same bore: a 10 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71813 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71813 angular-contact bearing?", "a": "A 71813 single-row angular-contact ball bearing has a 65 mm bore, 85 mm outer diameter and 10 mm width (2.559 × 3.346 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 120 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71813 bore code work?", "a": "The last two digits of 71813 are bore code 13, giving 13 × 5 = 65 mm bore. The 85 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61813 deep-groove envelope." }, { "q": "What is the contact angle of 71813?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71813 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71813?", "a": "On a 65 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71813", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71814", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 70, "D_mm": 90, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 128, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71814 carries bore code 14 = 70 mm. Outside diameter 90 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61814 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 70 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7214.", "The 90 mm outer ring of 71814 is only 10.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 10 mm-wide raceway long before the load rating is reached.", "Angular-contact 71814 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71814 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71814 angular-contact bearing?", "a": "A 71814 single-row angular-contact ball bearing has a 70 mm bore, 90 mm outer diameter and 10 mm width (2.756 × 3.543 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 128 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71814 bore code work?", "a": "The last two digits of 71814 are bore code 14, giving 14 × 5 = 70 mm bore. The 90 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61814 deep-groove envelope." }, { "q": "What is the contact angle of 71814?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71814 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71814 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 10.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 70 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71814", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71815", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 75, "D_mm": 95, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 136, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71815 carries bore code 15 = 75 mm. Outside diameter 95 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61815 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 718xx thin section at 75 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7215.", "Pair thin-section 71815 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 10.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 75 mm spindle seat.", "Preload class matters: a 71815 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71815 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71815 angular-contact bearing?", "a": "A 71815 single-row angular-contact ball bearing has a 75 mm bore, 95 mm outer diameter and 10 mm width (2.953 × 3.74 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 136 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71815 bore code work?", "a": "The last two digits of 71815 are bore code 15, giving 15 × 5 = 75 mm bore. The 95 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61815 deep-groove envelope." }, { "q": "What is the contact angle of 71815?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71815 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71815 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 75 mm bore the 71815 envelope is 75×95×10 mm with a 10.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71815", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71816", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 80, "D_mm": 100, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 144, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71816 carries bore code 16 = 80 mm. Outside diameter 100 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61816 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 80 mm bore has only a 10.0 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7216.", "With a 10.0 mm radial section on a 80 mm bore, the 71816 ring has little stiffness of its own: it copies the seat geometry, so grind the 80 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 100 mm housing.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71816 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71816 where a deep-groove 61816 would do: same 80×100×10 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71816 angular-contact bearing?", "a": "A 71816 single-row angular-contact ball bearing has a 80 mm bore, 100 mm outer diameter and 10 mm width (3.15 × 3.937 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 144 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71816 bore code work?", "a": "The last two digits of 71816 are bore code 16, giving 16 × 5 = 80 mm bore. The 100 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61816 deep-groove envelope." }, { "q": "What is the contact angle of 71816?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71816 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71816?", "a": "On a 80 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71816", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71817", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 85, "D_mm": 110, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 254, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61817 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 85 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7217.", "Draw-up on a thin-section 71817 is lighter than on a 72/73 bearing of the same bore: a 13 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Do not run a single 71817 where a deep-groove 61817 would do: same 85×110×13 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71817 angular-contact bearing?", "a": "A 71817 single-row angular-contact ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 254 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71817 bore code work?", "a": "The last two digits of 71817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61817 deep-groove envelope." }, { "q": "What is the contact angle of 71817?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71817 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71817 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 85 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71817", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71818", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 90, "D_mm": 115, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 267, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71818 carries bore code 18 = 90 mm. Outside diameter 115 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61818 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 90 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7218.", "The 115 mm outer ring of 71818 is only 12.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 13 mm-wide raceway long before the load rating is reached.", "Shaft and housing fillets must clear the bearing chamfer so the 13 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71818 angular-contact bearing?", "a": "A 71818 single-row angular-contact ball bearing has a 90 mm bore, 115 mm outer diameter and 13 mm width (3.543 × 4.528 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 267 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71818 bore code work?", "a": "The last two digits of 71818 are bore code 18, giving 18 × 5 = 90 mm bore. The 115 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61818 deep-groove envelope." }, { "q": "What is the contact angle of 71818?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71818 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71818 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 90 mm bore the 71818 envelope is 90×115×13 mm with a 12.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71818", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71819", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 95, "D_mm": 120, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 280, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71819 carries bore code 19 = 95 mm. Outside diameter 120 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61819 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 95 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7219.", "Pair thin-section 71819 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 12.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 95 mm spindle seat.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71819 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71819 angular-contact bearing?", "a": "A 71819 single-row angular-contact ball bearing has a 95 mm bore, 120 mm outer diameter and 13 mm width (3.74 × 4.724 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 280 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71819 bore code work?", "a": "The last two digits of 71819 are bore code 19, giving 19 × 5 = 95 mm bore. The 120 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61819 deep-groove envelope." }, { "q": "What is the contact angle of 71819?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71819 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71819?", "a": "On a 95 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 13 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 12.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71819", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71820", "brand": "GENERIC-ISO", "series": "71800-series", "type": "angular_contact", "d_mm": 100, "D_mm": 125, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 293, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71800-series (ISO 15 diameter series 8) the last two digits encode the bore: 71820 carries bore code 20 = 100 mm. Outside diameter 125 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61820 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 718xx thin section at 100 mm bore has only a 12.5 mm radial section height: it saves space but is highly sensitive to misalignment and deflection — verify spindle stiffness before choosing it over a 7220.", "With a 12.5 mm radial section on a 100 mm bore, the 71820 ring has little stiffness of its own: it copies the seat geometry, so grind the 100 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 125 mm housing.", "A single 71820 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71820 angular-contact bearing?", "a": "A 71820 single-row angular-contact ball bearing has a 100 mm bore, 125 mm outer diameter and 13 mm width (3.937 × 4.921 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 293 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71820 bore code work?", "a": "The last two digits of 71820 are bore code 20, giving 20 × 5 = 100 mm bore. The 125 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61820 deep-groove envelope." }, { "q": "What is the contact angle of 71820?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71820 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71820 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 100 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71820", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71904", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 20, "D_mm": 37, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 35, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71904 carries bore code 04 = 20 mm. Outside diameter 37 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61904 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 20 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "At a 20 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 20 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 8.5 mm radial section on a 20 mm bore, the 71904 ring has little stiffness of its own: it copies the seat geometry, so grind the 20 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 37 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71904 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71904 angular-contact bearing?", "a": "A 71904 single-row angular-contact ball bearing has a 20 mm bore, 37 mm outer diameter and 9 mm width (0.787 × 1.457 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 35 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71904 bore code work?", "a": "The last two digits of 71904 are bore code 04, giving 04 × 5 = 20 mm bore. The 37 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61904 deep-groove envelope." }, { "q": "What is the contact angle of 71904?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71904 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71904?", "a": "On a 20 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 9 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 8.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71904", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71905", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 25, "D_mm": 42, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 41, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71905 carries bore code 05 = 25 mm. Outside diameter 42 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61905 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 25 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "At a 25 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 25 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71905 is lighter than on a 72/73 bearing of the same bore: a 9 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Angular-contact 71905 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71905 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71905 angular-contact bearing?", "a": "A 71905 single-row angular-contact ball bearing has a 25 mm bore, 42 mm outer diameter and 9 mm width (0.984 × 1.654 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 41 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71905 bore code work?", "a": "The last two digits of 71905 are bore code 05, giving 05 × 5 = 25 mm bore. The 42 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61905 deep-groove envelope." }, { "q": "What is the contact angle of 71905?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71905 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71905 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 8.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 25 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71905", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71906", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 30, "D_mm": 47, "B_mm": 9, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 47, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71906 carries bore code 06 = 30 mm. Outside diameter 47 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61906 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 30 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "At a 30 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (8.5 mm section height at 30 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 47 mm outer ring of 71906 is only 8.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 9 mm-wide raceway long before the load rating is reached.", "Preload class matters: a 71906 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71906 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71906 angular-contact bearing?", "a": "A 71906 single-row angular-contact ball bearing has a 30 mm bore, 47 mm outer diameter and 9 mm width (1.181 × 1.85 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 47 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71906 bore code work?", "a": "The last two digits of 71906 are bore code 06, giving 06 × 5 = 30 mm bore. The 47 mm outside diameter and 9 mm width follow the ISO 15 diameter series, shared with the 61906 deep-groove envelope." }, { "q": "What is the contact angle of 71906?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71906 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71906 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 30 mm bore the 71906 envelope is 30×47×9 mm with a 8.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71906", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71907", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 35, "D_mm": 55, "B_mm": 10, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 72, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71907 carries bore code 07 = 35 mm. Outside diameter 55 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61907 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 35 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "At a 35 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (10.0 mm section height at 35 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71907 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 10.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 35 mm spindle seat.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71907 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71907 where a deep-groove 61907 would do: same 35×55×10 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71907 angular-contact bearing?", "a": "A 71907 single-row angular-contact ball bearing has a 35 mm bore, 55 mm outer diameter and 10 mm width (1.378 × 2.165 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 72 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71907 bore code work?", "a": "The last two digits of 71907 are bore code 07, giving 07 × 5 = 35 mm bore. The 55 mm outside diameter and 10 mm width follow the ISO 15 diameter series, shared with the 61907 deep-groove envelope." }, { "q": "What is the contact angle of 71907?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71907 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71907?", "a": "On a 35 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 10 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 10.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71907", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71908", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 40, "D_mm": 62, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 108, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71908 carries bore code 08 = 40 mm. Outside diameter 62 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61908 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 40 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "At a 40 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (11.0 mm section height at 40 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 11.0 mm radial section on a 40 mm bore, the 71908 ring has little stiffness of its own: it copies the seat geometry, so grind the 40 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 62 mm housing.", "Do not run a single 71908 where a deep-groove 61908 would do: same 40×62×12 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71908 angular-contact bearing?", "a": "A 71908 single-row angular-contact ball bearing has a 40 mm bore, 62 mm outer diameter and 12 mm width (1.575 × 2.441 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 108 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71908 bore code work?", "a": "The last two digits of 71908 are bore code 08, giving 08 × 5 = 40 mm bore. The 62 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61908 deep-groove envelope." }, { "q": "What is the contact angle of 71908?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71908 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71908 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 11.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 40 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71908", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71909", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 45, "D_mm": 68, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 125, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71909 carries bore code 09 = 45 mm. Outside diameter 68 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61909 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 45 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "At a 45 mm bore, shaft-seat finish and runout (target Ra ≤ 0.8 µm) govern angular-contact noise; a rough or out-of-round seat shows up as spindle runout before it shows as failure.", "The 719xx thin section (11.5 mm section height at 45 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71909 is lighter than on a 72/73 bearing of the same bore: a 12 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71909 angular-contact bearing?", "a": "A 71909 single-row angular-contact ball bearing has a 45 mm bore, 68 mm outer diameter and 12 mm width (1.772 × 2.677 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 125 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71909 bore code work?", "a": "The last two digits of 71909 are bore code 09, giving 09 × 5 = 45 mm bore. The 68 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61909 deep-groove envelope." }, { "q": "What is the contact angle of 71909?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71909 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71909 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 45 mm bore the 71909 envelope is 45×68×12 mm with a 11.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71909", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71910", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 50, "D_mm": 72, "B_mm": 12, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 129, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71910 carries bore code 10 = 50 mm. Outside diameter 72 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61910 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 50 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Thermal expansion on this 50 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (11.0 mm section height at 50 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 72 mm outer ring of 71910 is only 11.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 12 mm-wide raceway long before the load rating is reached.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71910 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71910 angular-contact bearing?", "a": "A 71910 single-row angular-contact ball bearing has a 50 mm bore, 72 mm outer diameter and 12 mm width (1.969 × 2.835 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 129 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71910 bore code work?", "a": "The last two digits of 71910 are bore code 10, giving 10 × 5 = 50 mm bore. The 72 mm outside diameter and 12 mm width follow the ISO 15 diameter series, shared with the 61910 deep-groove envelope." }, { "q": "What is the contact angle of 71910?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71910 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71910?", "a": "On a 50 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 12 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 11.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71910", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71911", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 55, "D_mm": 80, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 176, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71911 carries bore code 11 = 55 mm. Outside diameter 80 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61911 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 55 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Thermal expansion on this 55 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 55 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71911 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 12.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 55 mm spindle seat.", "A single 71911 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71911 angular-contact bearing?", "a": "A 71911 single-row angular-contact ball bearing has a 55 mm bore, 80 mm outer diameter and 13 mm width (2.165 × 3.15 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 176 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71911 bore code work?", "a": "The last two digits of 71911 are bore code 11, giving 11 × 5 = 55 mm bore. The 80 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61911 deep-groove envelope." }, { "q": "What is the contact angle of 71911?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71911 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71911 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 12.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 55 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71911", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71912", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 60, "D_mm": 85, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 189, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71912 carries bore code 12 = 60 mm. Outside diameter 85 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61912 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 60 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Thermal expansion on this 60 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 60 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 12.5 mm radial section on a 60 mm bore, the 71912 ring has little stiffness of its own: it copies the seat geometry, so grind the 60 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 85 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71912 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71912 angular-contact bearing?", "a": "A 71912 single-row angular-contact ball bearing has a 60 mm bore, 85 mm outer diameter and 13 mm width (2.362 × 3.346 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 189 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71912 bore code work?", "a": "The last two digits of 71912 are bore code 12, giving 12 × 5 = 60 mm bore. The 85 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61912 deep-groove envelope." }, { "q": "What is the contact angle of 71912?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71912 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71912 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 60 mm bore the 71912 envelope is 60×85×13 mm with a 12.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71912", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71913", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 65, "D_mm": 90, "B_mm": 13, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 202, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71913 carries bore code 13 = 65 mm. Outside diameter 90 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61913 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 65 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection" ], "pitfalls": [ "Thermal expansion on this 65 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (12.5 mm section height at 65 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71913 is lighter than on a 72/73 bearing of the same bore: a 13 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Angular-contact 71913 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian.", "Preload class matters: a 71913 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life." ], "faq": [ { "q": "What are the dimensions of a 71913 angular-contact bearing?", "a": "A 71913 single-row angular-contact ball bearing has a 65 mm bore, 90 mm outer diameter and 13 mm width (2.559 × 3.543 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 202 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71913 bore code work?", "a": "The last two digits of 71913 are bore code 13, giving 13 × 5 = 65 mm bore. The 90 mm outside diameter and 13 mm width follow the ISO 15 diameter series, shared with the 61913 deep-groove envelope." }, { "q": "What is the contact angle of 71913?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71913 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71913?", "a": "On a 65 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 13 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 12.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71913", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71914", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 70, "D_mm": 100, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 327, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71914 carries bore code 14 = 70 mm. Outside diameter 100 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61914 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 70 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating" ], "pitfalls": [ "Thermal expansion on this 70 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (15.0 mm section height at 70 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 100 mm outer ring of 71914 is only 15.0 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 16 mm-wide raceway long before the load rating is reached.", "Preload class matters: a 71914 in a DB pair is supplied as preload class light (L) for speed or heavy (H) for rigidity; mixing unmarked bearings in a pair gives uneven preload and short life.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71914 backwards loads the low shoulder and displaces the balls out of the raceway." ], "faq": [ { "q": "What are the dimensions of a 71914 angular-contact bearing?", "a": "A 71914 single-row angular-contact ball bearing has a 70 mm bore, 100 mm outer diameter and 16 mm width (2.756 × 3.937 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 327 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71914 bore code work?", "a": "The last two digits of 71914 are bore code 14, giving 14 × 5 = 70 mm bore. The 100 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61914 deep-groove envelope." }, { "q": "What is the contact angle of 71914?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71914 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71914 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 15.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 70 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71914", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71915", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 75, "D_mm": 105, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 346, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71915 carries bore code 15 = 75 mm. Outside diameter 105 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61915 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 75 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "precision rotary tables", "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes" ], "failure_modes": [ "edge loading and early spalling from shaft deflection or housing misalignment", "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway" ], "pitfalls": [ "Thermal expansion on this 75 mm bore consumes preload in a DB pair; size the preload class and clearance for the operating temperature, not the cold state.", "The 719xx thin section (15.0 mm section height at 75 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71915 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 15.0 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 75 mm spindle seat.", "Mounting direction is fixed by the asymmetric raceway — the marked side faces the axial load; installing 71915 backwards loads the low shoulder and displaces the balls out of the raceway.", "Do not run a single 71915 where a deep-groove 61915 would do: same 75×105×16 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing." ], "faq": [ { "q": "What are the dimensions of a 71915 angular-contact bearing?", "a": "A 71915 single-row angular-contact ball bearing has a 75 mm bore, 105 mm outer diameter and 16 mm width (2.953 × 4.134 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 346 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71915 bore code work?", "a": "The last two digits of 71915 are bore code 15, giving 15 × 5 = 75 mm bore. The 105 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61915 deep-groove envelope." }, { "q": "What is the contact angle of 71915?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71915 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71915 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 75 mm bore the 71915 envelope is 75×105×16 mm with a 15.0 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71915", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71916", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 80, "D_mm": 110, "B_mm": 16, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 365, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71916 carries bore code 16 = 80 mm. Outside diameter 110 mm and width 16 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61916 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 80 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "medical and lab spindles", "clutch and idler shafts", "semiconductor handling axes", "packaging machinery" ], "failure_modes": [ "electric pitting in VFD-driven spindles without shaft grounding protection", "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact" ], "pitfalls": [ "Mount this 80 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (15.0 mm section height at 80 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 15.0 mm radial section on a 80 mm bore, the 71916 ring has little stiffness of its own: it copies the seat geometry, so grind the 80 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 110 mm housing.", "Do not run a single 71916 where a deep-groove 61916 would do: same 80×110×16 mm envelope, but the angular contact trades speed and noise for axial capacity and needs pairing.", "Shaft and housing fillets must clear the bearing chamfer so the 16 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius." ], "faq": [ { "q": "What are the dimensions of a 71916 angular-contact bearing?", "a": "A 71916 single-row angular-contact ball bearing has a 80 mm bore, 110 mm outer diameter and 16 mm width (3.15 × 4.331 × 0.63 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 365 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71916 bore code work?", "a": "The last two digits of 71916 are bore code 16, giving 16 × 5 = 80 mm bore. The 110 mm outside diameter and 16 mm width follow the ISO 15 diameter series, shared with the 61916 deep-groove envelope." }, { "q": "What is the contact angle of 71916?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71916 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71916?", "a": "On a 80 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 16 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 15.0 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71916", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71917", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 85, "D_mm": 120, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 518, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71917 carries bore code 17 = 85 mm. Outside diameter 120 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61917 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 85 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "clutch and idler shafts", "semiconductor handling axes", "packaging machinery", "robotics joint arms" ], "failure_modes": [ "raceway spalling from axial overload exceeding the single-direction thrust rating", "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant" ], "pitfalls": [ "Mount this 85 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 85 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Draw-up on a thin-section 71917 is lighter than on a 72/73 bearing of the same bore: a 18 mm-wide ring clamps with a controlled light interference, and over-driving it bows the raceway — measure the mounted preload or runout rather than copying heavy-section fit tables.", "Shaft and housing fillets must clear the bearing chamfer so the 18 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat." ], "faq": [ { "q": "What are the dimensions of a 71917 angular-contact bearing?", "a": "A 71917 single-row angular-contact ball bearing has a 85 mm bore, 120 mm outer diameter and 18 mm width (3.346 × 4.724 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 518 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71917 bore code work?", "a": "The last two digits of 71917 are bore code 17, giving 17 × 5 = 85 mm bore. The 120 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61917 deep-groove envelope." }, { "q": "What is the contact angle of 71917?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71917 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71917 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 17.5 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 85 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71917", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71918", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 90, "D_mm": 125, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 543, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71918 carries bore code 18 = 90 mm. Outside diameter 125 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61918 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 90 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "semiconductor handling axes", "packaging machinery", "robotics joint arms", "precision rotary tables" ], "failure_modes": [ "preload loss after a paired set runs loose, letting the balls skid and smear the raceway", "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep" ], "pitfalls": [ "Mount this 90 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 90 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "The 125 mm outer ring of 71918 is only 17.5 mm thick over the raceway: the housing bore must be round and rigid and the abutments square, because edge stress on a thin section spalls the 18 mm-wide raceway long before the load rating is reached.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "A single 71918 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row." ], "faq": [ { "q": "What are the dimensions of a 71918 angular-contact bearing?", "a": "A 71918 single-row angular-contact ball bearing has a 90 mm bore, 125 mm outer diameter and 18 mm width (3.543 × 4.921 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 543 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71918 bore code work?", "a": "The last two digits of 71918 are bore code 18, giving 18 × 5 = 90 mm bore. The 125 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61918 deep-groove envelope." }, { "q": "What is the contact angle of 71918?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71918 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "Why is the 71918 ring section so thin?", "a": "The 718/719 dimension series save radial space: at a 90 mm bore the 71918 envelope is 90×125×18 mm with a 17.5 mm radial section. That trades absolute load capacity for compactness and weight in robotics, medical and rotary-table axes — capacity per mm of section is high, but the ratings sit below a 72-series bearing of the same bore." } ], "cross_ref": [ { "equiv_sku": "71918", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71919", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 95, "D_mm": 130, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 568, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71919 carries bore code 19 = 95 mm. Outside diameter 130 mm and width 18 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61919 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 95 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "packaging machinery", "robotics joint arms", "precision rotary tables", "medical and lab spindles" ], "failure_modes": [ "raceway smearing under marginal lubrication at start-up before oil climb reaches the contact", "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Mount this 95 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (17.5 mm section height at 95 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Pair thin-section 71919 units as a factory-matched set (universal SU/DU pairing): bench-pairing two singles with only 17.5 mm of section gives uncontrolled preload — order DB or DF pairs as one line item for the 95 mm spindle seat.", "A single 71919 angular-contact bearing takes axial load in ONE direction only — for bidirectional thrust, mount a matched pair (DB back-to-back or DF face-to-face), never rely on one row.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°." ], "faq": [ { "q": "What are the dimensions of a 71919 angular-contact bearing?", "a": "A 71919 single-row angular-contact ball bearing has a 95 mm bore, 130 mm outer diameter and 18 mm width (3.74 × 5.118 × 0.709 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 568 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71919 bore code work?", "a": "The last two digits of 71919 are bore code 19, giving 19 × 5 = 95 mm bore. The 130 mm outside diameter and 18 mm width follow the ISO 15 diameter series, shared with the 61919 deep-groove envelope." }, { "q": "What is the contact angle of 71919?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71919 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "What fits suit a thin-section 71919?", "a": "On a 95 mm shaft use the catalogue thin-section fit bands (typically j5/k5 shaft seats with H6/H7 housings) and keep shoulders minimal; because the 18 mm-wide rings are flexible, seat roundness and square abutment faces matter more than heavy interference for keeping the 17.5 mm section stable under load." } ], "cross_ref": [ { "equiv_sku": "71919", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "71920", "brand": "GENERIC-ISO", "series": "71900-series", "type": "angular_contact", "d_mm": 100, "D_mm": 140, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "weight_g": 769, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "In the 71900-series (ISO 15 diameter series 9) the last two digits encode the bore: 71920 carries bore code 20 = 100 mm. Outside diameter 140 mm and width 20 mm come from the ISO 15 boundary-dimensions general plan, shared with the 61920 deep-groove envelope. The '7' prefix marks a single-row angular-contact design with an asymmetric raceway and a nominal 40° contact angle (suffix C); a higher-angle variant carries more axial load, a 25° (E / A5) variant runs faster. For combined radial and axial load with a rotating inner ring on a 100 mm shaft, specify a k5 shaft seat with an H7 housing bore — verify against the load direction and magnitude, and pair two units (DB or DF) for bidirectional thrust.", "applications": [ "robotics joint arms", "precision rotary tables", "medical and lab spindles", "clutch and idler shafts" ], "failure_modes": [ "cage fracture from operation beyond the limiting speed with inadequate lubricant", "fretting corrosion on a loose shaft seat that lets the inner ring creep", "false brinelling from vibration while the shaft is stationary", "edge loading and early spalling from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount this 100 mm bore angular-contact pair by heating the inner rings (induction heater, max 120 °C) and clocking both faces; never drive a pair home through the outer rings.", "The 719xx thin section (20.0 mm section height at 100 mm bore) trades capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "With a 20.0 mm radial section on a 100 mm bore, the 71920 ring has little stiffness of its own: it copies the seat geometry, so grind the 100 mm shaft in one setup and check roundness — an out-of-round journal distorts the thin inner ring and reappears as vibration at the 140 mm housing.", "The 40° contact angle (suffix C) raises axial capacity but lowers speed versus a 25° (E / A5) variant; for high-speed spindles specify the 25° version, for heavy thrust specify 40°.", "Angular-contact 71920 tolerates only minutes of misalignment; a deflected shaft or a tilted housing face edge-loads the asymmetric raceway and spalls it early — align the seats to better than 0.001 radian." ], "faq": [ { "q": "What are the dimensions of a 71920 angular-contact bearing?", "a": "A 71920 single-row angular-contact ball bearing has a 100 mm bore, 140 mm outer diameter and 20 mm width (3.937 × 5.512 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with a nominal 40° contact angle. Geometry-based estimated mass is about 769 g for a brass-cage unit; catalogue masses vary with cage and ball complement." }, { "q": "How does the 71920 bore code work?", "a": "The last two digits of 71920 are bore code 20, giving 20 × 5 = 100 mm bore. The 140 mm outside diameter and 20 mm width follow the ISO 15 diameter series, shared with the 61920 deep-groove envelope." }, { "q": "What is the contact angle of 71920?", "a": "The nominal contact angle is 40° (suffix C): a higher angle carries more axial load but limits speed. A 25° (suffix E or A5) variant runs faster and is preferred for high-speed spindles; a 15° (suffix C7) version exists for very-high-speed duty. Confirm the angle and ball complement in the supplier catalogue." }, { "q": "Can a single 71920 take axial load in both directions?", "a": "No. A single-row angular-contact bearing carries axial load in one direction only. For bidirectional thrust, mount a matched pair — DB (back-to-back) for a rigid, moment-resisting arrangement with preload class light (L) for speed or heavy (H) for stiffness, DF (face-to-face) for thermal expansion tolerance, or DT (tandem) to share one-direction load." }, { "q": "How fast can a 71920 run?", "a": "Thin-section angular-contact bearings reach high speeds because the 20.0 mm section keeps the ball set light, but the practical limit is set by the lubricant and the precision of the 100 mm seat rather than the geometry alone; a 25° (E/A5) contact-angle variant and a light (L) preload class run faster than a 40° heavy-preloaded pair. Confirm the limiting speed in the supplier catalogue." } ], "cross_ref": [ { "equiv_sku": "71920", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.iso.org/obp/ui/en/#iso:std:iso:15:ed-4:v1:en", "catalog_ver": "iso15-ed4-geometry", "extracted_at": "2026-09-24", "last_verified": "2026-09-24", "confidence_score": 0.7, "status": "published", "aliases": [], "locale_variants": {}, "temp_min_c": -40, "temp_max_c": 150, "clearance_options": [ "CN", "C3" ] }, { "sku": "32204", "brand": "FAG", "manufacturer_designation": "32204-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 47, "B_mm": 19.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 165, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 40.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 5.5, "reference_speed_rpm": 9700, "limiting_speed_rpm": 20200, "max_rpm": 20200, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32204 is a single-row tapered roller bearing in the ISO 32200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by FAG in Schaeffler HR1 (2022 edition).Digit by digit, 32204 reads as bearing type 3 (single-row tapered roller), heavy section series 2, and bore reference 04 resolving to 20 mm; 47 mm OD and 19.25 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32204-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. At 9,700 r/min reference speed the 13.5 mm-section 32204 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 20,200 r/min as the mechanical ceiling. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32204 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "power-tool gear heads", "small automotive wheel hubs and trailer axles", "light-duty gearbox input/output shafts", "electric-motor pinion shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "At a 20 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 32204 shows up as gearbox vibration long before it fails.", "The 322 series at 20 mm bore (47×19.25 mm) is a wider, higher-capacity section than 30204; do not substitute without re-checking shaft shoulder diameters and pair setting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32204 mounting error.", "A single 32204 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Open 32204 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 40.5/36.5 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32204 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32204?", "a": "The 32204-XL is a single-row tapered roller bearing with 20 mm bore, 47 mm outer diameter and 19.25 mm width (0.787 × 1.85 × 0.758 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 40.5 kN, C0 36.5 kN, fatigue load limit Pu 5.5 kN, reference speed 9,700 r/min, limiting speed 20,200 r/min, mass about 165 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32204 bore code work?", "a": "The last two digits of 32204 are bore code 04, so 04 × 5 = 20 mm bore. The 47 mm OD and 19.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32204 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32204 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32204 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32204 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32204-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32204-XL" ], "locale_variants": {} }, { "sku": "32205", "brand": "FAG", "manufacturer_designation": "32205-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 52, "B_mm": 19.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 186, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 47.5, "static_load_kN": 45, "fatigue_load_limit_kN": 6.8, "reference_speed_rpm": 8000, "limiting_speed_rpm": 17500, "max_rpm": 17500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The 32205-XL is a 25×52×19.25 mm single-row tapered roller bearing — the heavy section entry in the 32200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Numbering ties the bearing to its envelope: 32205 means tapered-roller type 3, heavy section series 2, 25 mm bore — which is why the 52×19.25 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32205-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Speed planning uses two different ceilings: 8,000 r/min thermal reference and 17,500 r/min mechanical limiting speed. Because the contact line is tapered, one 32205 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 25 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "light-duty gearbox input/output shafts", "electric-motor pinion shafts", "steering knuckles and small differentials", "agricultural implement hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "At a 25 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 32205 shows up as gearbox vibration long before it fails.", "The 322 series at 25 mm bore (52×19.25 mm) is a wider, higher-capacity section than 30205; do not substitute without re-checking shaft shoulder diameters and pair setting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32205 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "At the 47.5 kN rating of 32205, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 17,500 r/min speed end and heavier preload only where moment stiffness dominates.", "Shaft and housing fillets must clear the bearing chamfer so the 19.25 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 47.5/45 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32205 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32205?", "a": "The 32205-XL is a single-row tapered roller bearing with 25 mm bore, 52 mm outer diameter and 19.25 mm width (0.984 × 2.047 × 0.758 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 47.5 kN, C0 45 kN, fatigue load limit Pu 6.8 kN, reference speed 8,000 r/min, limiting speed 17,500 r/min, mass about 186 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32205 bore code work?", "a": "The last two digits of 32205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 19.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32205 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32205 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32205 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32205 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32205-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32205-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32205-XL" ], "locale_variants": {} }, { "sku": "32206", "brand": "FAG", "manufacturer_designation": "32206-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 62, "B_mm": 21.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 292, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 63, "static_load_kN": 62, "fatigue_load_limit_kN": 9.9, "reference_speed_rpm": 6800, "limiting_speed_rpm": 14600, "max_rpm": 14600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In Schaeffler HR1 (2022 edition), 32206 appears as 32206-XL: an open, single-row tapered roller bearing in the heavy section of the 32200 dimension series, supplied with a pressed-steel cage as standard.On the FAG nameplate, 32206 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the heavy section, final digits 06 for the 30 mm bore. In Schaeffler notation 32206-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 63 kN and C0 62 kN, the 32206 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 14,600 r/min. For a 30 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32206 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32206 pair heats, loses setting control and smears the roller-rib contact.", "The 322 series at 30 mm bore (62×21.25 mm) is a wider, higher-capacity section than 30206; do not substitute without re-checking shaft shoulder diameters and pair setting.", "Setting is a design value, not an assembly feel: excessive preload in the 32206 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32206 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Catalogue reference speed and limiting speed are different limits: the 6,800 r/min reference is a thermal criterion under load, while the 14,600 r/min limiting value is the mechanical ceiling — observe both.", "The 63/62 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32206 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32206?", "a": "The 32206-XL is a single-row tapered roller bearing with 30 mm bore, 62 mm outer diameter and 21.25 mm width (1.181 × 2.441 × 0.837 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 63 kN, C0 62 kN, fatigue load limit Pu 9.9 kN, reference speed 6,800 r/min, limiting speed 14,600 r/min, mass about 292 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32206 bore code work?", "a": "The last two digits of 32206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 21.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32206 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32206 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32206 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32206 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32206-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32206-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32206-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32206-XL" ], "locale_variants": {} }, { "sku": "32207", "brand": "FAG", "manufacturer_designation": "32207-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 72, "B_mm": 24.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 449, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 84, "static_load_kN": 85, "fatigue_load_limit_kN": 13.7, "reference_speed_rpm": 6000, "limiting_speed_rpm": 12500, "max_rpm": 12500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32207-XL belongs to the FAG single-row tapered roller range — the 35 mm bore entry in the 32200 series, dimensioned 72 mm OD and 24.25 mm wide to the ISO 355 boundary plan.The code breaks down as type prefix 3 (tapered roller), series 2 (the heavy section), and bore code 07 = 35 mm; dimensions 35×72×24.25 mm therefore match the ISO 355 envelope. In Schaeffler notation 32207-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 13.7 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.01 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Mounting practice for 32207: the rotating cone takes the interference fit (k5 on a 35 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32207 pair heats, loses setting control and smears the roller-rib contact.", "The 322 series at 35 mm bore (72×24.25 mm) is a wider, higher-capacity section than 30207; do not substitute without re-checking shaft shoulder diameters and pair setting.", "A single 32207 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Do not mix brands or executions inside one 32207 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "The 32207 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 84/85 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32207 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32207?", "a": "The 32207-XL is a single-row tapered roller bearing with 35 mm bore, 72 mm outer diameter and 24.25 mm width (1.378 × 2.835 × 0.955 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 84 kN, C0 85 kN, fatigue load limit Pu 13.7 kN, reference speed 6,000 r/min, limiting speed 12,500 r/min, mass about 449 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32207 bore code work?", "a": "The last two digits of 32207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 24.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32207 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32207 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32207 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32207 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32207-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32207-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32207-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32207-XL" ], "locale_variants": {} }, { "sku": "32208", "brand": "FAG", "manufacturer_designation": "32208-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 80, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 550, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 94, "static_load_kN": 94, "fatigue_load_limit_kN": 15, "reference_speed_rpm": 5300, "limiting_speed_rpm": 11200, "max_rpm": 11200, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 40 mm shaft carrying combined load, FAG lists 32208 under catalogue execution 32208-XL: one open single-row tapered roller bearing in the heavy section of the 32200 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (heavy section), and the last two digits encode the 40 mm bore; the 80 mm OD and 24.75 mm width follow the ISO 355 general plan. In Schaeffler notation 32208-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Selection arithmetic: the C0/C ratio is about 1.00 (static 94 kN against dynamic 94 kN), typical of a tapered roller sized for axial capacity, and the 15 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Fit selection follows the rotating ring — interference on a rotating cone — and two 32208 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32208 pair heats, loses setting control and smears the roller-rib contact.", "The 322 series at 40 mm bore (80×24.75 mm) is a wider, higher-capacity section than 30208; do not substitute without re-checking shaft shoulder diameters and pair setting.", "At the 94 kN rating of 32208, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 11,200 r/min speed end and heavier preload only where moment stiffness dominates.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32208 mounting error.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 80 mm cup race release as noise within the first running hours.", "The 94/94 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32208 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32208?", "a": "The 32208-XL is a single-row tapered roller bearing with 40 mm bore, 80 mm outer diameter and 24.75 mm width (1.575 × 3.15 × 0.974 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 94 kN, C0 94 kN, fatigue load limit Pu 15 kN, reference speed 5,300 r/min, limiting speed 11,200 r/min, mass about 550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32208 bore code work?", "a": "The last two digits of 32208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 24.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32208 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32208 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32208 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32208 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32208-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32208-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32208-XL" ], "locale_variants": {} }, { "sku": "32209", "brand": "FAG", "manufacturer_designation": "32209-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 85, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 590, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 97, "static_load_kN": 100, "fatigue_load_limit_kN": 16.1, "reference_speed_rpm": 4850, "limiting_speed_rpm": 10300, "max_rpm": 10300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "FAG 32209 (32209-XL) is the heavy section tapered roller choice for a 45 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 85×24.75 mm ISO 355 envelope.Digit by digit, 32209 reads as bearing type 3 (single-row tapered roller), heavy section series 2, and bore reference 09 resolving to 45 mm; 85 mm OD and 24.75 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32209-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 20.0 mm radial section height ((85−45)/2) and 590 g catalogue mass frame a 45 mm bore bearing rated at 97 kN C — roughly 2.16 kN of dynamic capacity per millimetre of bore before application factors. A single 32209 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32209 pair heats, loses setting control and smears the roller-rib contact.", "The 322 series at 45 mm bore (85×24.75 mm) is a wider, higher-capacity section than 30209; do not substitute without re-checking shaft shoulder diameters and pair setting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32209 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32209 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 97/100 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32209 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32209?", "a": "The 32209-XL is a single-row tapered roller bearing with 45 mm bore, 85 mm outer diameter and 24.75 mm width (1.772 × 3.346 × 0.974 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 97 kN, C0 100 kN, fatigue load limit Pu 16.1 kN, reference speed 4,850 r/min, limiting speed 10,300 r/min, mass about 590 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32209 bore code work?", "a": "The last two digits of 32209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 24.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32209 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32209 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32209 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32209 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32209-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32209-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32209-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32209-XL" ], "locale_variants": {} }, { "sku": "32210", "brand": "FAG", "manufacturer_designation": "32210-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 90, "B_mm": 24.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 640, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 104, "static_load_kN": 110, "fatigue_load_limit_kN": 17.7, "reference_speed_rpm": 4500, "limiting_speed_rpm": 9700, "max_rpm": 9700, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 32210-XL in Schaeffler HR1 (2022 edition) denotes a single-row tapered roller bearing for a 50 mm shaft, heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.The code breaks down as type prefix 3 (tapered roller), series 2 (the heavy section), and bore code 10 = 50 mm; dimensions 50×90×24.75 mm therefore match the ISO 355 envelope. In Schaeffler notation 32210-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. At 4,500 r/min reference speed the 20.0 mm-section 32210 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 9,700 r/min as the mechanical ceiling. For a 50 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32210 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32210 pair heats, loses setting control and smears the roller-rib contact.", "The 322 series at 50 mm bore (90×24.75 mm) is a wider, higher-capacity section than 30210; do not substitute without re-checking shaft shoulder diameters and pair setting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32210 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32210 mounting error.", "Shaft and housing fillets must clear the bearing chamfer so the 24.75 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 104/110 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32210 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32210?", "a": "The 32210-XL is a single-row tapered roller bearing with 50 mm bore, 90 mm outer diameter and 24.75 mm width (1.969 × 3.543 × 0.974 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 104 kN, C0 110 kN, fatigue load limit Pu 17.7 kN, reference speed 4,500 r/min, limiting speed 9,700 r/min, mass about 640 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32210 bore code work?", "a": "The last two digits of 32210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 24.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32210 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32210 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32210 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32210 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32210-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32210-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32210-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32210-XL" ], "locale_variants": {} }, { "sku": "32211", "brand": "FAG", "manufacturer_designation": "32211-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 100, "B_mm": 26.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 870, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 130, "static_load_kN": 137, "fatigue_load_limit_kN": 21.6, "reference_speed_rpm": 4100, "limiting_speed_rpm": 8700, "max_rpm": 8700, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32211 is a single-row tapered roller bearing in the ISO 32200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by FAG in Schaeffler HR1 (2022 edition).Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (heavy section), and the last two digits encode the 55 mm bore; the 100 mm OD and 26.75 mm width follow the ISO 355 general plan. In Schaeffler notation 32211-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Speed planning uses two different ceilings: 4,100 r/min thermal reference and 8,700 r/min mechanical limiting speed. Mounting practice for 32211: the rotating cone takes the interference fit (k5 on a 55 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32211 pair heats, loses setting control and smears the roller-rib contact.", "The 322 series at 55 mm bore (100×26.75 mm) is a wider, higher-capacity section than 30211; do not substitute without re-checking shaft shoulder diameters and pair setting.", "Do not mix brands or executions inside one 32211 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32211 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Catalogue reference speed and limiting speed are different limits: the 4,100 r/min reference is a thermal criterion under load, while the 8,700 r/min limiting value is the mechanical ceiling — observe both.", "The 130/137 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32211 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32211?", "a": "The 32211-XL is a single-row tapered roller bearing with 55 mm bore, 100 mm outer diameter and 26.75 mm width (2.165 × 3.937 × 1.053 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 130 kN, C0 137 kN, fatigue load limit Pu 21.6 kN, reference speed 4,100 r/min, limiting speed 8,700 r/min, mass about 870 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32211 bore code work?", "a": "The last two digits of 32211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 26.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32211 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32211 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32211 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32211 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32211-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32211-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32211-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32211-XL" ], "locale_variants": {} }, { "sku": "32212", "brand": "FAG", "manufacturer_designation": "32212-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 110, "B_mm": 29.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1180, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 158, "static_load_kN": 171, "fatigue_load_limit_kN": 27.5, "reference_speed_rpm": 3850, "limiting_speed_rpm": 8000, "max_rpm": 8000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The 32212-XL is a 60×110×29.75 mm single-row tapered roller bearing — the heavy section entry in the 32200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Digit by digit, 32212 reads as bearing type 3 (single-row tapered roller), heavy section series 2, and bore reference 12 resolving to 60 mm; 110 mm OD and 29.75 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32212-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 158 kN and C0 171 kN, the 32212 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 8,000 r/min. Fit selection follows the rotating ring — interference on a rotating cone — and two 32212 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 60 mm bore 32212 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 60 mm bore (110×29.75 mm) is a wider, higher-capacity section than 30212; do not substitute without re-checking shaft shoulder diameters and pair setting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32212 mounting error.", "Setting is a design value, not an assembly feel: excessive preload in the 32212 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The 32212 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 158/171 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32212 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32212?", "a": "The 32212-XL is a single-row tapered roller bearing with 60 mm bore, 110 mm outer diameter and 29.75 mm width (2.362 × 4.331 × 1.171 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 158 kN, C0 171 kN, fatigue load limit Pu 27.5 kN, reference speed 3,850 r/min, limiting speed 8,000 r/min, mass about 1180 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32212 bore code work?", "a": "The last two digits of 32212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 29.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32212 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32212 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32212 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32212 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32212-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32212-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32212-XL" ], "locale_variants": {} }, { "sku": "32213", "brand": "FAG", "manufacturer_designation": "32213-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 120, "B_mm": 32.75, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1550, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 185, "static_load_kN": 202, "fatigue_load_limit_kN": 32.5, "reference_speed_rpm": 3600, "limiting_speed_rpm": 7200, "max_rpm": 7200, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In Schaeffler HR1 (2022 edition), 32213 appears as 32213-XL: an open, single-row tapered roller bearing in the heavy section of the 32200 dimension series, supplied with a pressed-steel cage as standard.Numbering ties the bearing to its envelope: 32213 means tapered-roller type 3, heavy section series 2, 65 mm bore — which is why the 120×32.75 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32213-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 32.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.09 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. A single 32213 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 65 mm bore 32213 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 65 mm bore (120×32.75 mm) is a wider, higher-capacity section than 30213; do not substitute without re-checking shaft shoulder diameters and pair setting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32213 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "A single 32213 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 120 mm cup race release as noise within the first running hours.", "The 185/202 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32213 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32213?", "a": "The 32213-XL is a single-row tapered roller bearing with 65 mm bore, 120 mm outer diameter and 32.75 mm width (2.559 × 4.724 × 1.289 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 185 kN, C0 202 kN, fatigue load limit Pu 32.5 kN, reference speed 3,600 r/min, limiting speed 7,200 r/min, mass about 1550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32213 bore code work?", "a": "The last two digits of 32213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 32.75 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32213 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32213 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32213 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32213 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32213-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32213-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32213-XL" ], "locale_variants": {} }, { "sku": "32214", "brand": "FAG", "manufacturer_designation": "32214-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 125, "B_mm": 33.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1650, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 194, "static_load_kN": 216, "fatigue_load_limit_kN": 34.5, "reference_speed_rpm": 3450, "limiting_speed_rpm": 6200, "max_rpm": 6200, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32214-XL belongs to the FAG single-row tapered roller range — the 70 mm bore entry in the 32200 series, dimensioned 125 mm OD and 33.25 mm wide to the ISO 355 boundary plan.On the FAG nameplate, 32214 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the heavy section, final digits 14 for the 70 mm bore. In Schaeffler notation 32214-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Selection arithmetic: the C0/C ratio is about 1.11 (static 216 kN against dynamic 194 kN), typical of a tapered roller sized for axial capacity, and the 34.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 32214 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 70 mm bore 32214 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 70 mm bore (125×33.25 mm) is a wider, higher-capacity section than 30214; do not substitute without re-checking shaft shoulder diameters and pair setting.", "Setting is a design value, not an assembly feel: excessive preload in the 32214 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "At the 194 kN rating of 32214, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 6,200 r/min speed end and heavier preload only where moment stiffness dominates.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 194/216 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32214 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32214?", "a": "The 32214-XL is a single-row tapered roller bearing with 70 mm bore, 125 mm outer diameter and 33.25 mm width (2.756 × 4.921 × 1.309 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 194 kN, C0 216 kN, fatigue load limit Pu 34.5 kN, reference speed 3,450 r/min, limiting speed 6,200 r/min, mass about 1650 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32214 bore code work?", "a": "The last two digits of 32214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 33.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32214 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32214 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32214 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32214 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32214-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32214-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32214-XL" ], "locale_variants": {} }, { "sku": "32215", "brand": "FAG", "manufacturer_designation": "32215-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 130, "B_mm": 33.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1750, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 201, "static_load_kN": 227, "fatigue_load_limit_kN": 37, "reference_speed_rpm": 3250, "limiting_speed_rpm": 6500, "max_rpm": 6500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 75 mm shaft carrying combined load, FAG lists 32215 under catalogue execution 32215-XL: one open single-row tapered roller bearing in the heavy section of the 32200 family.The code breaks down as type prefix 3 (tapered roller), series 2 (the heavy section), and bore code 15 = 75 mm; dimensions 75×130×33.25 mm therefore match the ISO 355 envelope. In Schaeffler notation 32215-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 27.5 mm radial section height ((130−75)/2) and 1750 g catalogue mass frame a 75 mm bore bearing rated at 201 kN C — roughly 2.68 kN of dynamic capacity per millimetre of bore before application factors. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32215 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 75 mm bore 32215 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 75 mm bore (130×33.25 mm) is a wider, higher-capacity section than 30215; do not substitute without re-checking shaft shoulder diameters and pair setting.", "A single 32215 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32215 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The 1750 g mass and 33.25 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32215.", "The 201/227 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32215 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32215?", "a": "The 32215-XL is a single-row tapered roller bearing with 75 mm bore, 130 mm outer diameter and 33.25 mm width (2.953 × 5.118 × 1.309 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 201 kN, C0 227 kN, fatigue load limit Pu 37 kN, reference speed 3,250 r/min, limiting speed 6,500 r/min, mass about 1750 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32215 bore code work?", "a": "The last two digits of 32215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 33.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32215 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32215 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32215 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32215 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32215-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32215-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32215-XL" ], "locale_variants": {} }, { "sku": "32216", "brand": "FAG", "manufacturer_designation": "32216-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 140, "B_mm": 35.25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 2140, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 234, "static_load_kN": 265, "fatigue_load_limit_kN": 41.5, "reference_speed_rpm": 3050, "limiting_speed_rpm": 6100, "max_rpm": 6100, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "FAG 32216 (32216-XL) is the heavy section tapered roller choice for a 80 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 140×35.25 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (heavy section), and the last two digits encode the 80 mm bore; the 140 mm OD and 35.25 mm width follow the ISO 355 general plan. In Schaeffler notation 32216-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Catalogue mass 2140 g for the 80×140×35.25 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Because the contact line is tapered, one 32216 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 80 mm bore 32216 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 80 mm bore (140×35.25 mm) is a wider, higher-capacity section than 30216; do not substitute without re-checking shaft shoulder diameters and pair setting.", "At the 234 kN rating of 32216, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 6,100 r/min speed end and heavier preload only where moment stiffness dominates.", "Do not mix brands or executions inside one 32216 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "Open 32216 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 234/265 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32216 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32216?", "a": "The 32216-XL is a single-row tapered roller bearing with 80 mm bore, 140 mm outer diameter and 35.25 mm width (3.15 × 5.512 × 1.388 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 234 kN, C0 265 kN, fatigue load limit Pu 41.5 kN, reference speed 3,050 r/min, limiting speed 6,100 r/min, mass about 2140 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32216 bore code work?", "a": "The last two digits of 32216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 35.25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32216 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32216 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32216 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32216 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32216-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32216-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32216-XL" ], "locale_variants": {} }, { "sku": "32217", "brand": "FAG", "manufacturer_designation": "32217-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 150, "B_mm": 38.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 2700, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 270, "static_load_kN": 305, "fatigue_load_limit_kN": 47.5, "reference_speed_rpm": 2950, "limiting_speed_rpm": 5700, "max_rpm": 5700, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 32217-XL in Schaeffler HR1 (2022 edition) denotes a single-row tapered roller bearing for a 85 mm shaft, heavy section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 32217 reads as bearing type 3 (single-row tapered roller), heavy section series 2, and bore reference 17 resolving to 85 mm; 150 mm OD and 38.5 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32217-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. At 2,950 r/min reference speed the 32.5 mm-section 32217 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 5,700 r/min as the mechanical ceiling. For a 85 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32217 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 85 mm bore 32217 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 85 mm bore (150×38.5 mm) is a wider, higher-capacity section than 30217; do not substitute without re-checking shaft shoulder diameters and pair setting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32217 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32217 mounting error.", "Shaft and housing fillets must clear the bearing chamfer so the 38.5 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 270/305 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32217 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32217?", "a": "The 32217-XL is a single-row tapered roller bearing with 85 mm bore, 150 mm outer diameter and 38.5 mm width (3.346 × 5.906 × 1.516 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 270 kN, C0 305 kN, fatigue load limit Pu 47.5 kN, reference speed 2,950 r/min, limiting speed 5,700 r/min, mass about 2700 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32217 bore code work?", "a": "The last two digits of 32217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 38.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32217 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32217 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32217 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32217 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32217-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32217-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32217-XL" ], "locale_variants": {} }, { "sku": "32218", "brand": "FAG", "manufacturer_designation": "32218-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 160, "B_mm": 42.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 3430, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 310, "static_load_kN": 360, "fatigue_load_limit_kN": 56, "reference_speed_rpm": 2850, "limiting_speed_rpm": 5300, "max_rpm": 5300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32218 is a single-row tapered roller bearing in the ISO 32200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by FAG in Schaeffler HR1 (2022 edition).Numbering ties the bearing to its envelope: 32218 means tapered-roller type 3, heavy section series 2, 90 mm bore — which is why the 160×42.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32218-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Speed planning uses two different ceilings: 2,850 r/min thermal reference and 5,300 r/min mechanical limiting speed. Mounting practice for 32218: the rotating cone takes the interference fit (k5 on a 90 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 90 mm bore 32218 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 90 mm bore (160×42.5 mm) is a wider, higher-capacity section than 30218; do not substitute without re-checking shaft shoulder diameters and pair setting.", "Do not mix brands or executions inside one 32218 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32218 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Catalogue reference speed and limiting speed are different limits: the 2,850 r/min reference is a thermal criterion under load, while the 5,300 r/min limiting value is the mechanical ceiling — observe both.", "The 310/360 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32218 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32218?", "a": "The 32218-XL is a single-row tapered roller bearing with 90 mm bore, 160 mm outer diameter and 42.5 mm width (3.543 × 6.299 × 1.673 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 310 kN, C0 360 kN, fatigue load limit Pu 56 kN, reference speed 2,850 r/min, limiting speed 5,300 r/min, mass about 3430 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32218 bore code work?", "a": "The last two digits of 32218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 42.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32218 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32218 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32218 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32218 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32218-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32218-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32218-XL" ], "locale_variants": {} }, { "sku": "32219", "brand": "FAG", "manufacturer_designation": "32219-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 170, "B_mm": 45.5, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 4220, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 355, "static_load_kN": 420, "fatigue_load_limit_kN": 64, "reference_speed_rpm": 2700, "limiting_speed_rpm": 4950, "max_rpm": 4950, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The 32219-XL is a 95×170×45.5 mm single-row tapered roller bearing — the heavy section entry in the 32200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the FAG nameplate, 32219 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the heavy section, final digits 19 for the 95 mm bore. In Schaeffler notation 32219-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 355 kN and C0 420 kN, the 32219 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 4,950 r/min. Fit selection follows the rotating ring — interference on a rotating cone — and two 32219 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 95 mm bore 32219 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 95 mm bore (170×45.5 mm) is a wider, higher-capacity section than 30219; do not substitute without re-checking shaft shoulder diameters and pair setting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32219 mounting error.", "Setting is a design value, not an assembly feel: excessive preload in the 32219 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The 32219 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 355/420 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32219 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32219?", "a": "The 32219-XL is a single-row tapered roller bearing with 95 mm bore, 170 mm outer diameter and 45.5 mm width (3.74 × 6.693 × 1.791 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 355 kN, C0 420 kN, fatigue load limit Pu 64 kN, reference speed 2,700 r/min, limiting speed 4,950 r/min, mass about 4220 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32219 bore code work?", "a": "The last two digits of 32219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 45.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32219 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32219 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32219 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32219 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32219-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32219-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32219-XL" ], "locale_variants": {} }, { "sku": "32220", "brand": "FAG", "manufacturer_designation": "32220-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 180, "B_mm": 49, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 5100, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 400, "static_load_kN": 475, "fatigue_load_limit_kN": 72, "reference_speed_rpm": 2600, "limiting_speed_rpm": 4650, "max_rpm": 4650, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In Schaeffler HR1 (2022 edition), 32220 appears as 32220-XL: an open, single-row tapered roller bearing in the heavy section of the 32200 dimension series, supplied with a pressed-steel cage as standard.Digit by digit, 32220 reads as bearing type 3 (single-row tapered roller), heavy section series 2, and bore reference 20 resolving to 100 mm; 180 mm OD and 49 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32220-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Selection arithmetic: the C0/C ratio is about 1.19 (static 475 kN against dynamic 400 kN), typical of a tapered roller sized for axial capacity, and the 72 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because the contact line is tapered, one 32220 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 100 mm bore 32220 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 100 mm bore (180×49 mm) is a wider, higher-capacity section than 30220; do not substitute without re-checking shaft shoulder diameters and pair setting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32220 mounting error.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32220 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 5100 g mass and 49 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32220.", "The 400/475 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32220 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32220?", "a": "The 32220-XL is a single-row tapered roller bearing with 100 mm bore, 180 mm outer diameter and 49 mm width (3.937 × 7.087 × 1.929 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 400 kN, C0 475 kN, fatigue load limit Pu 72 kN, reference speed 2,600 r/min, limiting speed 4,650 r/min, mass about 5100 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32220 bore code work?", "a": "The last two digits of 32220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 49 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32220 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32220 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32220 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32220 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32220-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32220-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32220-XL" ], "locale_variants": {} }, { "sku": "32221", "brand": "FAG", "manufacturer_designation": "32221-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 190, "B_mm": 53, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 6300, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 455, "static_load_kN": 550, "fatigue_load_limit_kN": 83, "reference_speed_rpm": 2550, "limiting_speed_rpm": 4400, "max_rpm": 4400, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32221-XL belongs to the FAG single-row tapered roller range — the 105 mm bore entry in the 32200 series, dimensioned 190 mm OD and 53 mm wide to the ISO 355 boundary plan.Numbering ties the bearing to its envelope: 32221 means tapered-roller type 3, heavy section series 2, 105 mm bore — which is why the 190×53 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32221-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 42.5 mm radial section height ((190−105)/2) and 6300 g catalogue mass frame a 105 mm bore bearing rated at 455 kN C — roughly 4.33 kN of dynamic capacity per millimetre of bore before application factors. For a 105 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 32221 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 105 mm bore 32221 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 105 mm bore (190×53 mm) is a wider, higher-capacity section than 30221; do not substitute without re-checking shaft shoulder diameters and pair setting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32221 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Setting is a design value, not an assembly feel: excessive preload in the 32221 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Open 32221 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 455/550 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32221 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32221?", "a": "The 32221-XL is a single-row tapered roller bearing with 105 mm bore, 190 mm outer diameter and 53 mm width (4.134 × 7.48 × 2.087 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 455 kN, C0 550 kN, fatigue load limit Pu 83 kN, reference speed 2,550 r/min, limiting speed 4,400 r/min, mass about 6300 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32221 bore code work?", "a": "The last two digits of 32221 are bore code 21, so 21 × 5 = 105 mm bore. The 190 mm OD and 53 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32221 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32221 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32221 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32221 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32221-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32221-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32221", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32221-XL" ], "locale_variants": {} }, { "sku": "32222", "brand": "FAG", "manufacturer_designation": "32222-XL", "series": "32200-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 200, "B_mm": 56, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 7200, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 490, "static_load_kN": 590, "fatigue_load_limit_kN": 88, "reference_speed_rpm": 2410, "limiting_speed_rpm": 4150, "max_rpm": 4150, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 110 mm shaft carrying combined load, FAG lists 32222 under catalogue execution 32222-XL: one open single-row tapered roller bearing in the heavy section of the 32200 family.On the FAG nameplate, 32222 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the heavy section, final digits 22 for the 110 mm bore. In Schaeffler notation 32222-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Catalogue mass 7200 g for the 110×200×56 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Mounting practice for 32222: the rotating cone takes the interference fit (m6 on a 110 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 110 mm bore 32222 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 322 series at 110 mm bore (200×56 mm) is a wider, higher-capacity section than 30222; do not substitute without re-checking shaft shoulder diameters and pair setting.", "Setting is a design value, not an assembly feel: excessive preload in the 32222 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "A single 32222 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Shaft and housing fillets must clear the bearing chamfer so the 56 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 490/590 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32222 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32222?", "a": "The 32222-XL is a single-row tapered roller bearing with 110 mm bore, 200 mm outer diameter and 56 mm width (4.331 × 7.874 × 2.205 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 490 kN, C0 590 kN, fatigue load limit Pu 88 kN, reference speed 2,410 r/min, limiting speed 4,150 r/min, mass about 7200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32222 bore code work?", "a": "The last two digits of 32222 are bore code 22, so 22 × 5 = 110 mm bore. The 200 mm OD and 56 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32222 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (heavy section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32222 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32222 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32222 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32222-DF", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "32222-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32222-XL" ], "locale_variants": {} }, { "sku": "32004", "brand": "FAG", "manufacturer_designation": "32004-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 20, "D_mm": 42, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 101, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 28.5, "static_load_kN": 29, "fatigue_load_limit_kN": 4.05, "reference_speed_rpm": 10700, "limiting_speed_rpm": 21900, "max_rpm": 21900, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32004-X-XL belongs to the FAG single-row tapered roller range — the 20 mm bore entry in the 32000 series, dimensioned 42 mm OD and 15 mm wide to the ISO 355 boundary plan.On the FAG nameplate, 32004 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the low-friction section, final digits 04 for the 20 mm bore. In Schaeffler notation 32004-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Speed planning uses two different ceilings: 10,700 r/min thermal reference and 21,900 r/min mechanical limiting speed. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32004 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "light-duty gearbox input/output shafts", "electric-motor pinion shafts", "steering knuckles and small differentials", "agricultural implement hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "At a 20 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 32004 shows up as gearbox vibration long before it fails.", "The 320 series at 20 mm bore (42×15 mm) is the low-friction, higher-speed section; it carries less thrust than a 30204 of the same bore, so verify the axial load share before swapping.", "Do not mix brands or executions inside one 32004 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32004 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Shaft and housing fillets must clear the bearing chamfer so the 15 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 28.5/29 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32004 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32004?", "a": "The 32004-X-XL is a single-row tapered roller bearing with 20 mm bore, 42 mm outer diameter and 15 mm width (0.787 × 1.654 × 0.591 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 28.5 kN, C0 29 kN, fatigue load limit Pu 4.05 kN, reference speed 10,700 r/min, limiting speed 21,900 r/min, mass about 101 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32004 bore code work?", "a": "The last two digits of 32004 are bore code 04, so 04 × 5 = 20 mm bore. The 42 mm OD and 15 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32004 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32004 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32004 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32004 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32004-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32004-X-XL" ], "locale_variants": {} }, { "sku": "32005", "brand": "FAG", "manufacturer_designation": "32005-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 47, "B_mm": 15, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 117, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 31.5, "static_load_kN": 34, "fatigue_load_limit_kN": 4.8, "reference_speed_rpm": 9000, "limiting_speed_rpm": 18900, "max_rpm": 18900, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 25 mm shaft carrying combined load, FAG lists 32005 under catalogue execution 32005-X-XL: one open single-row tapered roller bearing in the low-friction section of the 32000 family.The code breaks down as type prefix 3 (tapered roller), series 2 (the low-friction section), and bore code 05 = 25 mm; dimensions 25×47×15 mm therefore match the ISO 355 envelope. In Schaeffler notation 32005-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 31.5 kN and C0 34 kN, the 32005 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 18,900 r/min. Because the contact line is tapered, one 32005 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 25 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "steering knuckles and small differentials", "agricultural implement hubs", "small conveyor drive pulleys", "power-tool gear heads" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At a 25 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 32005 shows up as gearbox vibration long before it fails.", "The 320 series at 25 mm bore (47×15 mm) is the low-friction, higher-speed section; it carries less thrust than a 30205 of the same bore, so verify the axial load share before swapping.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32005 mounting error.", "Setting is a design value, not an assembly feel: excessive preload in the 32005 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Catalogue reference speed and limiting speed are different limits: the 9,000 r/min reference is a thermal criterion under load, while the 18,900 r/min limiting value is the mechanical ceiling — observe both.", "The 31.5/34 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32005 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32005?", "a": "The 32005-X-XL is a single-row tapered roller bearing with 25 mm bore, 47 mm outer diameter and 15 mm width (0.984 × 1.85 × 0.591 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 31.5 kN, C0 34 kN, fatigue load limit Pu 4.8 kN, reference speed 9,000 r/min, limiting speed 18,900 r/min, mass about 117 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32005 bore code work?", "a": "The last two digits of 32005 are bore code 05, so 05 × 5 = 25 mm bore. The 47 mm OD and 15 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32005 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32005 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32005 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32005 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32005-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32005-X-XL" ], "locale_variants": {} }, { "sku": "32006", "brand": "FAG", "manufacturer_designation": "32006-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 55, "B_mm": 17, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 173, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 46, "static_load_kN": 47, "fatigue_load_limit_kN": 7.1, "reference_speed_rpm": 7900, "limiting_speed_rpm": 16100, "max_rpm": 16100, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "FAG 32006 (32006-X-XL) is the low-friction section tapered roller choice for a 30 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 55×17 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (low-friction section), and the last two digits encode the 30 mm bore; the 55 mm OD and 17 mm width follow the ISO 355 general plan. In Schaeffler notation 32006-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 7.1 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.02 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. For a 30 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32006 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32006 pair heats, loses setting control and smears the roller-rib contact.", "The 320 series at 30 mm bore (55×17 mm) is the low-friction, higher-speed section; it carries less thrust than a 30206 of the same bore, so verify the axial load share before swapping.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32006 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "A single 32006 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The 32006 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 46/47 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32006 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32006?", "a": "The 32006-X-XL is a single-row tapered roller bearing with 30 mm bore, 55 mm outer diameter and 17 mm width (1.181 × 2.165 × 0.669 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 46 kN, C0 47 kN, fatigue load limit Pu 7.1 kN, reference speed 7,900 r/min, limiting speed 16,100 r/min, mass about 173 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32006 bore code work?", "a": "The last two digits of 32006 are bore code 06, so 06 × 5 = 30 mm bore. The 55 mm OD and 17 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32006 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32006 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32006 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32006 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32006-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32006-X-XL" ], "locale_variants": {} }, { "sku": "32007", "brand": "FAG", "manufacturer_designation": "32007-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 62, "B_mm": 18, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 228, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 54, "static_load_kN": 57, "fatigue_load_limit_kN": 9, "reference_speed_rpm": 7000, "limiting_speed_rpm": 14000, "max_rpm": 14000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 32007-X-XL in Schaeffler HR1 (2022 edition) denotes a single-row tapered roller bearing for a 35 mm shaft, low-friction section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 32007 reads as bearing type 3 (single-row tapered roller), low-friction section series 2, and bore reference 07 resolving to 35 mm; 62 mm OD and 18 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32007-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Selection arithmetic: the C0/C ratio is about 1.06 (static 57 kN against dynamic 54 kN), typical of a tapered roller sized for axial capacity, and the 9 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting practice for 32007: the rotating cone takes the interference fit (k5 on a 35 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32007 pair heats, loses setting control and smears the roller-rib contact.", "The 320 series at 35 mm bore (62×18 mm) is the low-friction, higher-speed section; it carries less thrust than a 30207 of the same bore, so verify the axial load share before swapping.", "Setting is a design value, not an assembly feel: excessive preload in the 32007 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "At the 54 kN rating of 32007, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 14,000 r/min speed end and heavier preload only where moment stiffness dominates.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 62 mm cup race release as noise within the first running hours.", "The 54/57 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32007 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32007?", "a": "The 32007-X-XL is a single-row tapered roller bearing with 35 mm bore, 62 mm outer diameter and 18 mm width (1.378 × 2.441 × 0.709 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 54 kN, C0 57 kN, fatigue load limit Pu 9 kN, reference speed 7,000 r/min, limiting speed 14,000 r/min, mass about 228 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32007 bore code work?", "a": "The last two digits of 32007 are bore code 07, so 07 × 5 = 35 mm bore. The 62 mm OD and 18 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32007 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32007 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32007 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32007 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32007-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32007-X-XL" ], "locale_variants": {} }, { "sku": "32008", "brand": "FAG", "manufacturer_designation": "32008-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 68, "B_mm": 19, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 279, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 63, "static_load_kN": 71, "fatigue_load_limit_kN": 11.2, "reference_speed_rpm": 6200, "limiting_speed_rpm": 12800, "max_rpm": 12800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32008 is a single-row tapered roller bearing in the ISO 32000 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by FAG in Schaeffler HR1 (2022 edition).Numbering ties the bearing to its envelope: 32008 means tapered-roller type 3, low-friction section series 2, 40 mm bore — which is why the 68×19 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32008-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 14.0 mm radial section height ((68−40)/2) and 279 g catalogue mass frame a 40 mm bore bearing rated at 63 kN C — roughly 1.57 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating cone — and two 32008 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32008 pair heats, loses setting control and smears the roller-rib contact.", "The 320 series at 40 mm bore (68×19 mm) is the low-friction, higher-speed section; it carries less thrust than a 30208 of the same bore, so verify the axial load share before swapping.", "A single 32008 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32008 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 63/71 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32008 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32008?", "a": "The 32008-X-XL is a single-row tapered roller bearing with 40 mm bore, 68 mm outer diameter and 19 mm width (1.575 × 2.677 × 0.748 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 63 kN, C0 71 kN, fatigue load limit Pu 11.2 kN, reference speed 6,200 r/min, limiting speed 12,800 r/min, mass about 279 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32008 bore code work?", "a": "The last two digits of 32008 are bore code 08, so 08 × 5 = 40 mm bore. The 68 mm OD and 19 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32008 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32008 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32008 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32008 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32008-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32008-X-XL" ], "locale_variants": {} }, { "sku": "32009", "brand": "FAG", "manufacturer_designation": "32009-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 75, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 354, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 72, "static_load_kN": 86, "fatigue_load_limit_kN": 13.5, "reference_speed_rpm": 5400, "limiting_speed_rpm": 11400, "max_rpm": 11400, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The 32009-X-XL is a 45×75×20 mm single-row tapered roller bearing — the low-friction section entry in the 32000 series, with an asymmetric raceway cut for thrust capacity and separable mounting.On the FAG nameplate, 32009 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the low-friction section, final digits 09 for the 45 mm bore. In Schaeffler notation 32009-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Catalogue mass 354 g for the 45×75×20 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. A single 32009 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32009 pair heats, loses setting control and smears the roller-rib contact.", "The 320 series at 45 mm bore (75×20 mm) is the low-friction, higher-speed section; it carries less thrust than a 30209 of the same bore, so verify the axial load share before swapping.", "At the 72 kN rating of 32009, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 11,400 r/min speed end and heavier preload only where moment stiffness dominates.", "Do not mix brands or executions inside one 32009 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "The 354 g mass and 20 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32009.", "The 72/86 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32009 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32009?", "a": "The 32009-X-XL is a single-row tapered roller bearing with 45 mm bore, 75 mm outer diameter and 20 mm width (1.772 × 2.953 × 0.787 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 72 kN, C0 86 kN, fatigue load limit Pu 13.5 kN, reference speed 5,400 r/min, limiting speed 11,400 r/min, mass about 354 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32009 bore code work?", "a": "The last two digits of 32009 are bore code 09, so 09 × 5 = 45 mm bore. The 75 mm OD and 20 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32009 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32009 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32009 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32009 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32009-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32009-X-XL" ], "locale_variants": {} }, { "sku": "32010", "brand": "FAG", "manufacturer_designation": "32010-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 80, "B_mm": 20, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 385, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 75, "static_load_kN": 94, "fatigue_load_limit_kN": 14.9, "reference_speed_rpm": 4950, "limiting_speed_rpm": 10500, "max_rpm": 10500, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In Schaeffler HR1 (2022 edition), 32010 appears as 32010-X-XL: an open, single-row tapered roller bearing in the low-friction section of the 32000 dimension series, supplied with a pressed-steel cage as standard.Digit by digit, 32010 reads as bearing type 3 (single-row tapered roller), low-friction section series 2, and bore reference 10 resolving to 50 mm; 80 mm OD and 20 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32010-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Speed planning uses two different ceilings: 4,950 r/min thermal reference and 10,500 r/min mechanical limiting speed. For a 50 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32010 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32010 pair heats, loses setting control and smears the roller-rib contact.", "The 320 series at 50 mm bore (80×20 mm) is the low-friction, higher-speed section; it carries less thrust than a 30210 of the same bore, so verify the axial load share before swapping.", "At the 75 kN rating of 32010, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 10,500 r/min speed end and heavier preload only where moment stiffness dominates.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32010 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Catalogue reference speed and limiting speed are different limits: the 4,950 r/min reference is a thermal criterion under load, while the 10,500 r/min limiting value is the mechanical ceiling — observe both.", "The 75/94 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32010 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32010?", "a": "The 32010-X-XL is a single-row tapered roller bearing with 50 mm bore, 80 mm outer diameter and 20 mm width (1.969 × 3.15 × 0.787 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 75 kN, C0 94 kN, fatigue load limit Pu 14.9 kN, reference speed 4,950 r/min, limiting speed 10,500 r/min, mass about 385 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32010 bore code work?", "a": "The last two digits of 32010 are bore code 10, so 10 × 5 = 50 mm bore. The 80 mm OD and 20 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32010 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32010 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32010 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32010 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32010-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32010-X-XL" ], "locale_variants": {} }, { "sku": "32011", "brand": "FAG", "manufacturer_designation": "32011-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 90, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 560, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 96, "static_load_kN": 118, "fatigue_load_limit_kN": 19.4, "reference_speed_rpm": 4600, "limiting_speed_rpm": 9300, "max_rpm": 9300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32011-X-XL belongs to the FAG single-row tapered roller range — the 55 mm bore entry in the 32000 series, dimensioned 90 mm OD and 23 mm wide to the ISO 355 boundary plan.Numbering ties the bearing to its envelope: 32011 means tapered-roller type 3, low-friction section series 2, 55 mm bore — which is why the 90×23 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32011-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 96 kN and C0 118 kN, the 32011 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 9,300 r/min. Mounting practice for 32011: the rotating cone takes the interference fit (k5 on a 55 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 32011 pair heats, loses setting control and smears the roller-rib contact.", "The 320 series at 55 mm bore (90×23 mm) is the low-friction, higher-speed section; it carries less thrust than a 30211 of the same bore, so verify the axial load share before swapping.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32011 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Do not mix brands or executions inside one 32011 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "The 32011 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 96/118 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32011 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32011?", "a": "The 32011-X-XL is a single-row tapered roller bearing with 55 mm bore, 90 mm outer diameter and 23 mm width (2.165 × 3.543 × 0.906 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 96 kN, C0 118 kN, fatigue load limit Pu 19.4 kN, reference speed 4,600 r/min, limiting speed 9,300 r/min, mass about 560 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32011 bore code work?", "a": "The last two digits of 32011 are bore code 11, so 11 × 5 = 55 mm bore. The 90 mm OD and 23 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32011 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32011 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32011 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32011 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32011-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32011-X-XL" ], "locale_variants": {} }, { "sku": "32012", "brand": "FAG", "manufacturer_designation": "32012-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 95, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 610, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 97, "static_load_kN": 124, "fatigue_load_limit_kN": 20.1, "reference_speed_rpm": 4350, "limiting_speed_rpm": 8800, "max_rpm": 8800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 60 mm shaft carrying combined load, FAG lists 32012 under catalogue execution 32012-X-XL: one open single-row tapered roller bearing in the low-friction section of the 32000 family.On the FAG nameplate, 32012 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the low-friction section, final digits 12 for the 60 mm bore. In Schaeffler notation 32012-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 20.1 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.28 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two 32012 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 60 mm bore 32012 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 60 mm bore (95×23 mm) is the low-friction, higher-speed section; it carries less thrust than a 30212 of the same bore, so verify the axial load share before swapping.", "Do not mix brands or executions inside one 32012 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32012 mounting error.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 95 mm cup race release as noise within the first running hours.", "The 97/124 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32012 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32012?", "a": "The 32012-X-XL is a single-row tapered roller bearing with 60 mm bore, 95 mm outer diameter and 23 mm width (2.362 × 3.74 × 0.906 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 97 kN, C0 124 kN, fatigue load limit Pu 20.1 kN, reference speed 4,350 r/min, limiting speed 8,800 r/min, mass about 610 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32012 bore code work?", "a": "The last two digits of 32012 are bore code 12, so 12 × 5 = 60 mm bore. The 95 mm OD and 23 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32012 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32012 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32012 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32012 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32012-X-XL" ], "locale_variants": {} }, { "sku": "32013", "brand": "FAG", "manufacturer_designation": "32013-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 100, "B_mm": 23, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 640, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 97, "static_load_kN": 125, "fatigue_load_limit_kN": 20.8, "reference_speed_rpm": 4150, "limiting_speed_rpm": 8300, "max_rpm": 8300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "FAG 32013 (32013-X-XL) is the low-friction section tapered roller choice for a 65 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 100×23 mm ISO 355 envelope.The code breaks down as type prefix 3 (tapered roller), series 2 (the low-friction section), and bore code 13 = 65 mm; dimensions 65×100×23 mm therefore match the ISO 355 envelope. In Schaeffler notation 32013-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Selection arithmetic: the C0/C ratio is about 1.29 (static 125 kN against dynamic 97 kN), typical of a tapered roller sized for axial capacity, and the 20.8 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 32013 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 65 mm bore 32013 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 65 mm bore (100×23 mm) is the low-friction, higher-speed section; it carries less thrust than a 30213 of the same bore, so verify the axial load share before swapping.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32013 mounting error.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32013 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 97/125 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32013 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32013?", "a": "The 32013-X-XL is a single-row tapered roller bearing with 65 mm bore, 100 mm outer diameter and 23 mm width (2.559 × 3.937 × 0.906 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 97 kN, C0 125 kN, fatigue load limit Pu 20.8 kN, reference speed 4,150 r/min, limiting speed 8,300 r/min, mass about 640 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32013 bore code work?", "a": "The last two digits of 32013 are bore code 13, so 13 × 5 = 65 mm bore. The 100 mm OD and 23 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32013 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32013 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32013 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32013 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32013-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32013-X-XL" ], "locale_variants": {} }, { "sku": "32014", "brand": "FAG", "manufacturer_designation": "32014-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 110, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 880, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 123, "static_load_kN": 159, "fatigue_load_limit_kN": 26.5, "reference_speed_rpm": 3800, "limiting_speed_rpm": 7600, "max_rpm": 7600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 32014-X-XL in Schaeffler HR1 (2022 edition) denotes a single-row tapered roller bearing for a 70 mm shaft, low-friction section, with an open pressed-steel-cage execution and one-direction axial capacity.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (low-friction section), and the last two digits encode the 70 mm bore; the 110 mm OD and 25 mm width follow the ISO 355 general plan. In Schaeffler notation 32014-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 20.0 mm radial section height ((110−70)/2) and 880 g catalogue mass frame a 70 mm bore bearing rated at 123 kN C — roughly 1.76 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 32014 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 70 mm bore 32014 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 70 mm bore (110×25 mm) is the low-friction, higher-speed section; it carries less thrust than a 30214 of the same bore, so verify the axial load share before swapping.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32014 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Setting is a design value, not an assembly feel: excessive preload in the 32014 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The 880 g mass and 25 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32014.", "The 123/159 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32014 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32014?", "a": "The 32014-X-XL is a single-row tapered roller bearing with 70 mm bore, 110 mm outer diameter and 25 mm width (2.756 × 4.331 × 0.984 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 123 kN, C0 159 kN, fatigue load limit Pu 26.5 kN, reference speed 3,800 r/min, limiting speed 7,600 r/min, mass about 880 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32014 bore code work?", "a": "The last two digits of 32014 are bore code 14, so 14 × 5 = 70 mm bore. The 110 mm OD and 25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32014 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32014 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32014 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32014 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32014-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32014-X-XL" ], "locale_variants": {} }, { "sku": "32015", "brand": "FAG", "manufacturer_designation": "32015-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 115, "B_mm": 25, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 920, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 124, "static_load_kN": 165, "fatigue_load_limit_kN": 27.5, "reference_speed_rpm": 3600, "limiting_speed_rpm": 7200, "max_rpm": 7200, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32015 is a single-row tapered roller bearing in the ISO 32000 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by FAG in Schaeffler HR1 (2022 edition).Digit by digit, 32015 reads as bearing type 3 (single-row tapered roller), low-friction section series 2, and bore reference 15 resolving to 75 mm; 115 mm OD and 25 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32015-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Catalogue mass 920 g for the 75×115×25 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32015 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 75 mm bore 32015 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 75 mm bore (115×25 mm) is the low-friction, higher-speed section; it carries less thrust than a 30215 of the same bore, so verify the axial load share before swapping.", "Setting is a design value, not an assembly feel: excessive preload in the 32015 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "A single 32015 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Open 32015 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 124/165 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32015 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32015?", "a": "The 32015-X-XL is a single-row tapered roller bearing with 75 mm bore, 115 mm outer diameter and 25 mm width (2.953 × 4.528 × 0.984 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 124 kN, C0 165 kN, fatigue load limit Pu 27.5 kN, reference speed 3,600 r/min, limiting speed 7,200 r/min, mass about 920 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32015 bore code work?", "a": "The last two digits of 32015 are bore code 15, so 15 × 5 = 75 mm bore. The 115 mm OD and 25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32015 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32015 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32015 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32015 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32015-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32015-X-XL" ], "locale_variants": {} }, { "sku": "32016", "brand": "FAG", "manufacturer_designation": "32016-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 125, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1290, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 162, "static_load_kN": 212, "fatigue_load_limit_kN": 34.5, "reference_speed_rpm": 3450, "limiting_speed_rpm": 6600, "max_rpm": 6600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The 32016-X-XL is a 80×125×29 mm single-row tapered roller bearing — the low-friction section entry in the 32000 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Numbering ties the bearing to its envelope: 32016 means tapered-roller type 3, low-friction section series 2, 80 mm bore — which is why the 125×29 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32016-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. At 3,450 r/min reference speed the 22.5 mm-section 32016 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 6,600 r/min as the mechanical ceiling. Because the contact line is tapered, one 32016 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 80 mm bore 32016 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 80 mm bore (125×29 mm) is the low-friction, higher-speed section; it carries less thrust than a 30216 of the same bore, so verify the axial load share before swapping.", "A single 32016 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "At the 162 kN rating of 32016, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 6,600 r/min speed end and heavier preload only where moment stiffness dominates.", "Shaft and housing fillets must clear the bearing chamfer so the 29 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 162/212 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32016 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32016?", "a": "The 32016-X-XL is a single-row tapered roller bearing with 80 mm bore, 125 mm outer diameter and 29 mm width (3.15 × 4.921 × 1.142 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 162 kN, C0 212 kN, fatigue load limit Pu 34.5 kN, reference speed 3,450 r/min, limiting speed 6,600 r/min, mass about 1290 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32016 bore code work?", "a": "The last two digits of 32016 are bore code 16, so 16 × 5 = 80 mm bore. The 125 mm OD and 29 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32016 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32016 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32016 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32016 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32016-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32016-X-XL" ], "locale_variants": {} }, { "sku": "32017", "brand": "FAG", "manufacturer_designation": "32017-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 130, "B_mm": 29, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1360, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 167, "static_load_kN": 224, "fatigue_load_limit_kN": 36.5, "reference_speed_rpm": 3250, "limiting_speed_rpm": 6300, "max_rpm": 6300, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In Schaeffler HR1 (2022 edition), 32017 appears as 32017-X-XL: an open, single-row tapered roller bearing in the low-friction section of the 32000 dimension series, supplied with a pressed-steel cage as standard.On the FAG nameplate, 32017 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the low-friction section, final digits 17 for the 85 mm bore. In Schaeffler notation 32017-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Speed planning uses two different ceilings: 3,250 r/min thermal reference and 6,300 r/min mechanical limiting speed. For a 85 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 32017 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 85 mm bore 32017 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 85 mm bore (130×29 mm) is the low-friction, higher-speed section; it carries less thrust than a 30217 of the same bore, so verify the axial load share before swapping.", "At the 167 kN rating of 32017, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 6,300 r/min speed end and heavier preload only where moment stiffness dominates.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32017 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Catalogue reference speed and limiting speed are different limits: the 3,250 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.", "The 167/224 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32017 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32017?", "a": "The 32017-X-XL is a single-row tapered roller bearing with 85 mm bore, 130 mm outer diameter and 29 mm width (3.346 × 5.118 × 1.142 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 167 kN, C0 224 kN, fatigue load limit Pu 36.5 kN, reference speed 3,250 r/min, limiting speed 6,300 r/min, mass about 1360 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32017 bore code work?", "a": "The last two digits of 32017 are bore code 17, so 17 × 5 = 85 mm bore. The 130 mm OD and 29 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32017 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32017 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32017 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32017 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32017-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32017-X-XL" ], "locale_variants": {} }, { "sku": "32018", "brand": "FAG", "manufacturer_designation": "32018-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 140, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1770, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 195, "static_load_kN": 255, "fatigue_load_limit_kN": 41, "reference_speed_rpm": 3200, "limiting_speed_rpm": 5900, "max_rpm": 5900, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32018-X-XL belongs to the FAG single-row tapered roller range — the 90 mm bore entry in the 32000 series, dimensioned 140 mm OD and 32 mm wide to the ISO 355 boundary plan.The code breaks down as type prefix 3 (tapered roller), series 2 (the low-friction section), and bore code 18 = 90 mm; dimensions 90×140×32 mm therefore match the ISO 355 envelope. In Schaeffler notation 32018-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 195 kN and C0 255 kN, the 32018 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 5,900 r/min. Mounting practice for 32018: the rotating cone takes the interference fit (k5 on a 90 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 90 mm bore 32018 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 90 mm bore (140×32 mm) is the low-friction, higher-speed section; it carries less thrust than a 30218 of the same bore, so verify the axial load share before swapping.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32018 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Do not mix brands or executions inside one 32018 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "The 32018 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 195/255 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32018 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32018?", "a": "The 32018-X-XL is a single-row tapered roller bearing with 90 mm bore, 140 mm outer diameter and 32 mm width (3.543 × 5.512 × 1.26 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 195 kN, C0 255 kN, fatigue load limit Pu 41 kN, reference speed 3,200 r/min, limiting speed 5,900 r/min, mass about 1770 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32018 bore code work?", "a": "The last two digits of 32018 are bore code 18, so 18 × 5 = 90 mm bore. The 140 mm OD and 32 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32018 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32018 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32018 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32018 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32018-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32018-X-XL" ], "locale_variants": {} }, { "sku": "32019", "brand": "FAG", "manufacturer_designation": "32019-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 145, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1850, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 201, "static_load_kN": 275, "fatigue_load_limit_kN": 43.5, "reference_speed_rpm": 3000, "limiting_speed_rpm": 5600, "max_rpm": 5600, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 95 mm shaft carrying combined load, FAG lists 32019 under catalogue execution 32019-X-XL: one open single-row tapered roller bearing in the low-friction section of the 32000 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (low-friction section), and the last two digits encode the 95 mm bore; the 145 mm OD and 32 mm width follow the ISO 355 general plan. In Schaeffler notation 32019-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 43.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.37 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two 32019 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 95 mm bore 32019 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 95 mm bore (145×32 mm) is the low-friction, higher-speed section; it carries less thrust than a 30219 of the same bore, so verify the axial load share before swapping.", "Do not mix brands or executions inside one 32019 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32019 mounting error.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 145 mm cup race release as noise within the first running hours.", "The 201/275 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32019 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32019?", "a": "The 32019-X-XL is a single-row tapered roller bearing with 95 mm bore, 145 mm outer diameter and 32 mm width (3.74 × 5.709 × 1.26 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 201 kN, C0 275 kN, fatigue load limit Pu 43.5 kN, reference speed 3,000 r/min, limiting speed 5,600 r/min, mass about 1850 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32019 bore code work?", "a": "The last two digits of 32019 are bore code 19, so 19 × 5 = 95 mm bore. The 145 mm OD and 32 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32019 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32019 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32019 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32019 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32019-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32019-X-XL" ], "locale_variants": {} }, { "sku": "32020", "brand": "FAG", "manufacturer_designation": "32020-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 150, "B_mm": 32, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 1910, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 205, "static_load_kN": 285, "fatigue_load_limit_kN": 44.5, "reference_speed_rpm": 2900, "limiting_speed_rpm": 5400, "max_rpm": 5400, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "FAG 32020 (32020-X-XL) is the low-friction section tapered roller choice for a 100 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 150×32 mm ISO 355 envelope.On the FAG nameplate, 32020 follows the ISO 355 convention: 3 for the tapered-roller type, 2 for the low-friction section, final digits 20 for the 100 mm bore. In Schaeffler notation 32020-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. The 25.0 mm radial section height ((150−100)/2) and 1910 g catalogue mass frame a 100 mm bore bearing rated at 205 kN C — roughly 2.05 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line is tapered, one 32020 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 100 mm bore 32020 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 100 mm bore (150×32 mm) is the low-friction, higher-speed section; it carries less thrust than a 30220 of the same bore, so verify the axial load share before swapping.", "Do not mix brands or executions inside one 32020 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "Do not mix brands or executions inside one 32020 pair — matched sets are ground for a specific setting, and pairing a FAG basic unit with a different suffix variant will not share the setting evenly.", "Open 32020 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 205/285 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32020 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32020?", "a": "The 32020-X-XL is a single-row tapered roller bearing with 100 mm bore, 150 mm outer diameter and 32 mm width (3.937 × 5.906 × 1.26 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 205 kN, C0 285 kN, fatigue load limit Pu 44.5 kN, reference speed 2,900 r/min, limiting speed 5,400 r/min, mass about 1910 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32020 bore code work?", "a": "The last two digits of 32020 are bore code 20, so 20 × 5 = 100 mm bore. The 150 mm OD and 32 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32020 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32020 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32020 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32020 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32020-X-XL" ], "locale_variants": {} }, { "sku": "32021", "brand": "FAG", "manufacturer_designation": "32021-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 160, "B_mm": 35, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 2440, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 238, "static_load_kN": 330, "fatigue_load_limit_kN": 51, "reference_speed_rpm": 2800, "limiting_speed_rpm": 5100, "max_rpm": 5100, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 32021-X-XL in Schaeffler HR1 (2022 edition) denotes a single-row tapered roller bearing for a 105 mm shaft, low-friction section, with an open pressed-steel-cage execution and one-direction axial capacity.The code breaks down as type prefix 3 (tapered roller), series 2 (the low-friction section), and bore code 21 = 105 mm; dimensions 105×160×35 mm therefore match the ISO 355 envelope. In Schaeffler notation 32021-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Catalogue mass 2440 g for the 105×160×35 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 105 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 32021 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 105 mm bore 32021 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 105 mm bore (160×35 mm) is the low-friction, higher-speed section; it carries less thrust than a 30221 of the same bore, so verify the axial load share before swapping.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32021 mounting error.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32021 mounting error.", "Shaft and housing fillets must clear the bearing chamfer so the 35 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 238/330 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32021 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32021?", "a": "The 32021-X-XL is a single-row tapered roller bearing with 105 mm bore, 160 mm outer diameter and 35 mm width (4.134 × 6.299 × 1.378 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 238 kN, C0 330 kN, fatigue load limit Pu 51 kN, reference speed 2,800 r/min, limiting speed 5,100 r/min, mass about 2440 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32021 bore code work?", "a": "The last two digits of 32021 are bore code 21, so 21 × 5 = 105 mm bore. The 160 mm OD and 35 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32021 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32021 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32021 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32021 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32021-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32021-X-XL" ], "locale_variants": {} }, { "sku": "32022", "brand": "FAG", "manufacturer_designation": "32022-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 170, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 3050, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 285, "static_load_kN": 395, "fatigue_load_limit_kN": 60, "reference_speed_rpm": 2650, "limiting_speed_rpm": 4750, "max_rpm": 4750, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "32022 is a single-row tapered roller bearing in the ISO 32000 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by FAG in Schaeffler HR1 (2022 edition).Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (low-friction section), and the last two digits encode the 110 mm bore; the 170 mm OD and 38 mm width follow the ISO 355 general plan. In Schaeffler notation 32022-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. At 2,650 r/min reference speed the 30.0 mm-section 32022 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 4,750 r/min as the mechanical ceiling. Mounting practice for 32022: the rotating cone takes the interference fit (m6 on a 110 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 110 mm bore 32022 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 320 series at 110 mm bore (170×38 mm) is the low-friction, higher-speed section; it carries less thrust than a 30222 of the same bore, so verify the axial load share before swapping.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32022 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32022 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Catalogue reference speed and limiting speed are different limits: the 2,650 r/min reference is a thermal criterion under load, while the 4,750 r/min limiting value is the mechanical ceiling — observe both.", "The 285/395 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32022 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32022?", "a": "The 32022-X-XL is a single-row tapered roller bearing with 110 mm bore, 170 mm outer diameter and 38 mm width (4.331 × 6.693 × 1.496 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 285 kN, C0 395 kN, fatigue load limit Pu 60 kN, reference speed 2,650 r/min, limiting speed 4,750 r/min, mass about 3050 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32022 bore code work?", "a": "The last two digits of 32022 are bore code 22, so 22 × 5 = 110 mm bore. The 170 mm OD and 38 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32022 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32022 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32022 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32022 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32022-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32022-X-XL" ], "locale_variants": {} }, { "sku": "32024", "brand": "FAG", "manufacturer_designation": "32024-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 120, "D_mm": 180, "B_mm": 38, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 3270, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 295, "static_load_kN": 420, "fatigue_load_limit_kN": 63, "reference_speed_rpm": 2460, "limiting_speed_rpm": 4450, "max_rpm": 4450, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "In Schaeffler HR1 (2022 edition), 32024 appears as 32024-X-XL: an open, single-row tapered roller bearing in the low-friction section of the 32000 dimension series, supplied with a pressed-steel cage as standard.Numbering ties the bearing to its envelope: 32024 means tapered-roller type 3, low-friction section series 2, 120 mm bore — which is why the 180×38 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In Schaeffler notation 32024-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 295 kN and C0 420 kN, the 32024 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 4,450 r/min. A single 32024 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "marine propulsion gearboxes", "large industrial mixer shafts", "offshore winch and drawworks drums", "rolling-mill roll-neck bearings" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 320 series at 120 mm bore (180×38 mm) is the low-friction, higher-speed section; it carries less thrust than a 30224 of the same bore, so verify the axial load share before swapping.", "A single 32024 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "A single 32024 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 180 mm cup race release as noise within the first running hours.", "The 295/420 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32024 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32024?", "a": "The 32024-X-XL is a single-row tapered roller bearing with 120 mm bore, 180 mm outer diameter and 38 mm width (4.724 × 7.087 × 1.496 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 295 kN, C0 420 kN, fatigue load limit Pu 63 kN, reference speed 2,460 r/min, limiting speed 4,450 r/min, mass about 3270 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32024 bore code work?", "a": "The last two digits of 32024 are bore code 24, so 24 × 5 = 120 mm bore. The 180 mm OD and 38 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32024 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32024 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32024 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32024 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32024-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32024-X-XL" ], "locale_variants": {} }, { "sku": "32026", "brand": "FAG", "manufacturer_designation": "32026-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 130, "D_mm": 200, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 5000, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 385, "static_load_kN": 550, "fatigue_load_limit_kN": 81, "reference_speed_rpm": 2320, "limiting_speed_rpm": 4000, "max_rpm": 4000, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "For a 130 mm shaft carrying combined load, FAG lists 32026 under catalogue execution 32026-X-XL: one open single-row tapered roller bearing in the low-friction section of the 32000 family.The code breaks down as type prefix 3 (tapered roller), series 2 (the low-friction section), and bore code 26 = 130 mm; dimensions 130×200×45 mm therefore match the ISO 355 envelope. In Schaeffler notation 32026-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Selection arithmetic: the C0/C ratio is about 1.43 (static 550 kN against dynamic 385 kN), typical of a tapered roller sized for axial capacity, and the 81 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32026 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "heavy-duty rolling-mill gearboxes", "large crusher and mineral-processing drives", "wind-turbine main shafts", "marine propulsion gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "At 130 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 320 series at 130 mm bore (200×45 mm) is the low-friction, higher-speed section; it carries less thrust than a 30226 of the same bore, so verify the axial load share before swapping.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32026 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 32026 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The 5000 g mass and 45 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 32026.", "The 385/550 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32026 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32026?", "a": "The 32026-X-XL is a single-row tapered roller bearing with 130 mm bore, 200 mm outer diameter and 45 mm width (5.118 × 7.874 × 1.772 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 385 kN, C0 550 kN, fatigue load limit Pu 81 kN, reference speed 2,320 r/min, limiting speed 4,000 r/min, mass about 5000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32026 bore code work?", "a": "The last two digits of 32026 are bore code 26, so 26 × 5 = 130 mm bore. The 200 mm OD and 45 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32026 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32026 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32026 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32026 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32026-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32026-X-XL" ], "locale_variants": {} }, { "sku": "32028", "brand": "FAG", "manufacturer_designation": "32028-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 140, "D_mm": 210, "B_mm": 45, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 5400, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 400, "static_load_kN": 590, "fatigue_load_limit_kN": 86, "reference_speed_rpm": 2180, "limiting_speed_rpm": 3800, "max_rpm": 3800, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "Ordering number 32028-X-XL in Schaeffler HR1 (2022 edition) denotes a single-row tapered roller bearing for a 140 mm shaft, low-friction section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 32028 reads as bearing type 3 (single-row tapered roller), low-friction section series 2, and bore reference 28 resolving to 140 mm; 210 mm OD and 45 mm width are the matching ISO 355 boundary values. In Schaeffler notation 32028-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. Catalogue mass 5400 g for the 140×210×45 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 140 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 32028 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "large industrial mixer shafts", "offshore winch and drawworks drums", "rolling-mill roll-neck bearings", "heavy-duty rolling-mill gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "At 140 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 320 series at 140 mm bore (210×45 mm) is the low-friction, higher-speed section; it carries less thrust than a 30228 of the same bore, so verify the axial load share before swapping.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32028 mounting error.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32028 mounting error.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 400/590 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32028 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32028?", "a": "The 32028-X-XL is a single-row tapered roller bearing with 140 mm bore, 210 mm outer diameter and 45 mm width (5.512 × 8.268 × 1.772 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 400 kN, C0 590 kN, fatigue load limit Pu 86 kN, reference speed 2,180 r/min, limiting speed 3,800 r/min, mass about 5400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32028 bore code work?", "a": "The last two digits of 32028 are bore code 28, so 28 × 5 = 140 mm bore. The 210 mm OD and 45 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32028 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32028 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32028 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32028 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32028-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32028-X-XL" ], "locale_variants": {} }, { "sku": "32030", "brand": "FAG", "manufacturer_designation": "32030-X-XL", "series": "32000-series", "type": "tapered_roller", "d_mm": 150, "D_mm": 225, "B_mm": 48, "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "material": "GCr15", "weight_g": 6500, "weight_estimated": false, "standard": "ISO 355", "dynamic_load_kN": 455, "static_load_kN": 680, "fatigue_load_limit_kN": 96, "reference_speed_rpm": 1990, "limiting_speed_rpm": 3550, "max_rpm": 3550, "temp_min_c": -40, "temp_max_c": 120, "naming_rule_text": "The 32030-X-XL is a 150×225×48 mm single-row tapered roller bearing — the low-friction section entry in the 32000 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 2 is the ISO 355 diameter/width series (low-friction section), and the last two digits encode the 150 mm bore; the 225 mm OD and 48 mm width follow the ISO 355 general plan. In Schaeffler notation 32030-X-XL is the basic X-life execution; B-suffix variants have a steeper contact angle and are not interchangeable with the base bearing. With C 455 kN and C0 680 kN, the 32030 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 3,550 r/min. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 32030 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "marine propulsion gearboxes", "large industrial mixer shafts", "offshore winch and drawworks drums", "rolling-mill roll-neck bearings" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "At 150 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 320 series at 150 mm bore (225×48 mm) is the low-friction, higher-speed section; it carries less thrust than a 30230 of the same bore, so verify the axial load share before swapping.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 32030 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 32030 mounting error.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 455/680 kN ratings are Schaeffler HR1 values for the X-life execution; the -XL suffix denotes the premium grade and is part of the order designation, so quote it in full when purchasing.", "Schaeffler lists 32030 in the X-life basic execution; variant executions with -B or other suffixes are separate order numbers and are not interchangeable with the basic X-life bearing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 32030?", "a": "The 32030-X-XL is a single-row tapered roller bearing with 150 mm bore, 225 mm outer diameter and 48 mm width (5.906 × 8.858 × 1.89 in) per ISO 355. From Schaeffler HR1 (2022 edition): basic dynamic load rating C 455 kN, C0 680 kN, fatigue load limit Pu 96 kN, reference speed 1,990 r/min, limiting speed 3,550 r/min, mass about 6500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 32030 bore code work?", "a": "The last two digits of 32030 are bore code 30, so 30 × 5 = 150 mm bore. The 225 mm OD and 48 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 32030 series and X-life execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 2 is the ISO 355 series (low-friction section). The FAG -XL suffix denotes X-life premium grade; the ISO 355 series code is interchangeable with other brands. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 32030 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 32030 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 32030 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "32030-SKF", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "32030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.de/std/1F9A", "catalog_ver": "Schaeffler HR1 (2022 ed.), Tapered roller bearings DIN/ISO 355", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "32030-X-XL" ], "locale_variants": {} }, { "sku": "21322", "brand": "FAG", "manufacturer_designation": "FAG 21322-E1-XL-TVPB", "series": "21300-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 600, "static_load_kN": 640, "fatigue_load_limit_kN": 70, "max_rpm": 4000, "reference_speed_rpm": 2700, "limiting_speed_rpm": 4000, "weight_g": 11060, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "21322 is a double-row spherical roller bearing in the 21300-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by FAG in Schaeffler catalogue HR1. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 110 mm bore; the 240 mm OD and 50 mm width follow the ISO 15 general plan. The FAG suffix chain reads E1 (X-life internal design with increased load ratings) plus TVPB (glass-fibre reinforced polyamide window cage); a K in the middle of the designation (e.g. 21322-E1-XL-K-TVPB) marks the 1:12 tapered-bore variant for adapter-sleeve mounting. Selection arithmetic: the C0/C ratio is about 1.07 (static 640 kN against dynamic 600 kN), typical of a spherical roller sized for heavy combined loads, and the 70 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After mounting, swing the outer ring to confirm free self-alignment: the 21322 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 110 mm bore 21322 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 110 mm bore (240×50 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Catalogue reference speed and limiting speed are different limits: the 2,700 r/min reference is a thermal criterion under load, while the 4,000 r/min limiting value is the mechanical ceiling — observe both.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21322 pits long before its L10 life.", "The 600/640 kN ratings are FAG catalogue values for this exact execution (21322-E1-XL-TVPB); FAG can revise internal geometry without changing the order number, so keep the catalogue version (Schaeffler catalogue HR1) with the specification and re-verify for critical drives.", "FAG lists several executions of 21322 (cylindrical bore as listed, tapered-bore 21322-E1-XL-K variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 21322-E1-XL-TVPB designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21322?", "a": "The 21322-E1-XL-TVPB is a double-row spherical roller bearing with 110 mm bore, 240 mm outer diameter and 50 mm width (4.331 × 9.449 × 1.969 in) per ISO 15. From Schaeffler catalogue HR1: basic dynamic load rating C 600 kN, C0 640 kN, fatigue load limit Pu 70 kN, reference speed 2,700 r/min, limiting speed 4,000 r/min, mass about 11060 g. It is an open, self-aligning bearing with a glass-fibre reinforced polyamide (PA66) window cage." }, { "q": "How does the 21322 bore code work?", "a": "The last two digits of 21322 are bore code 22, so 22 × 5 = 110 mm bore. The 240 mm OD and 50 mm width come from the ISO 15 dimension-series plan (dimension series 13 (heavy OD, normal width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the E1-XL-TVPB suffix mean on 21322?", "a": "E1-XL is the Schaeffler X-life internal design with increased load ratings, and TVPB marks a glass-fibre reinforced polyamide window cage rated to 120 °C. The K variant (21322-E1-XL-K-TVPB) has a 1:12 tapered bore for adapter-sleeve mounting." }, { "q": "Can 21322 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 21322K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 21322 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "21322-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "21322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/en/products-and-solutions/rolling-and-plain-bearings/", "catalog_ver": "Schaeffler HR1 (2022 ed.), spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21322", "21322-E1-XL-TVPB" ], "locale_variants": {} }, { "sku": "SL183004-XL", "brand": "FAG", "manufacturer_designation": "SL183004-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 42, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 30.5, "static_load_kN": 26, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 11400, "max_rpm": 11400, "reference_speed_rpm": 7500, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×42×16 mm with a 11.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 30.5 kN and C0 26 kN; with a C/C0 ratio of 1.17 the 16 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 4.55 kN, the limiting speed 11,400 r/min and the thermal reference speed 7,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.52 kN per millimetre of the 20 mm bore and 1.91 kN per millimetre of the 16 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 110 g (0.16 g per mm² of the 42×16 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 20 mm bore this size balances the 42 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value High radial rigidity at 30.5 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 26 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 42 mm outside diameter and 30.5 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 20 mm seat, and in rope drums and winch drums the 110 g mass suits the compact, space-optimised housing. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 16 mm width and the published 26 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL183004-XL?", "a": "The SL183004-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 42 mm outside diameter, 20 mm bore and 16 mm width, envelope 20×42×16 mm. Mass is 110 g." }, { "q": "What does the SL183004-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183004-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×42×16 mm and the catalogue ratings are C 30.5 kN, C0 26 kN, Cur 4.55 kN." }, { "q": "What is the load capacity of the SL183004-XL?", "a": "The basic dynamic load rating C is 30.5 kN and the basic static load rating C0 is 26 kN; the fatigue load limit Cur is 4.55 kN." }, { "q": "What is the maximum speed of the SL183004-XL?", "a": "The limiting speed is 11,400 r/min and the thermal reference speed is 7,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183004-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183004-XL", "SL183004-XL" ], "locale_variants": {} }, { "sku": "SL182204-XL", "brand": "FAG", "manufacturer_designation": "SL182204-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45.5, "static_load_kN": 37, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 10400, "max_rpm": 10400, "reference_speed_rpm": 6500, "weight_g": 160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×18 mm with a 13.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 45.5 kN and C0 37 kN; with a C/C0 ratio of 1.23 the 18 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 6.2 kN, the limiting speed 10,400 r/min and the thermal reference speed 6,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.27 kN per millimetre of the 20 mm bore and 2.53 kN per millimetre of the 18 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 160 g (0.19 g per mm² of the 47×18 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 20 mm bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 13.5 mm section height between the 20 mm bore and the 47 mm outside diameter In the 47 mm envelope the cageless pack raises C0 to 37 kN; the trade is the 10,400 r/min limiting speed, set by roller-to-roller sliding rather than by a cage As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 6.2 kN Cur value. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 47 mm outside diameter and 45.5 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 20 mm seat, and in hydraulic pumps and radial piston pumps the 160 g mass suits the compact, space-optimised housing. Designers also specify it for material handling conveyor pulleys, relying on the 18 mm width and the published 37 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182204-XL?", "a": "The SL182204-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 47 mm outside diameter, 20 mm bore and 18 mm width, envelope 20×47×18 mm. Mass is 160 g." }, { "q": "What does the SL182204-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182204-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×47×18 mm and the catalogue ratings are C 45.5 kN, C0 37 kN, Cur 6.2 kN." }, { "q": "What is the load capacity of the SL182204-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 37 kN; the fatigue load limit Cur is 6.2 kN." }, { "q": "What is the maximum speed of the SL182204-XL?", "a": "The limiting speed is 10,400 r/min and the thermal reference speed is 6,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182204-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182204", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182204-XL", "SL182204-XL" ], "locale_variants": {} }, { "sku": "SL183005-XL", "brand": "FAG", "manufacturer_designation": "SL183005-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 35, "static_load_kN": 32, "fatigue_load_limit_kN": 5.6, "limiting_speed_rpm": 9500, "max_rpm": 9500, "reference_speed_rpm": 6000, "weight_g": 120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×47×16 mm with a 11.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 35 kN and C0 32 kN; with a C/C0 ratio of 1.09 the 16 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 5.6 kN, the limiting speed 9,500 r/min and the thermal reference speed 6,000 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.40 kN per millimetre of the 25 mm bore and 2.19 kN per millimetre of the 16 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 120 g (0.16 g per mm² of the 47×16 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 25 mm bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range High radial rigidity at 35 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 32 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 47 mm outside diameter and 35 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 25 mm seat, and in rolling-mill and steel-industry drives the 120 g mass suits the compact, space-optimised housing. Designers also specify it for construction machinery slewing drives, relying on the 16 mm width and the published 32 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL183005-XL?", "a": "The SL183005-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 47 mm outside diameter, 25 mm bore and 16 mm width, envelope 25×47×16 mm. Mass is 120 g." }, { "q": "What does the SL183005-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183005-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×47×16 mm and the catalogue ratings are C 35 kN, C0 32 kN, Cur 5.6 kN." }, { "q": "What is the load capacity of the SL183005-XL?", "a": "The basic dynamic load rating C is 35 kN and the basic static load rating C0 is 32 kN; the fatigue load limit Cur is 5.6 kN." }, { "q": "What is the maximum speed of the SL183005-XL?", "a": "The limiting speed is 9,500 r/min and the thermal reference speed is 6,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183005-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183005-XL", "SL183005-XL" ], "locale_variants": {} }, { "sku": "SL182205-XL", "brand": "FAG", "manufacturer_designation": "SL182205-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 51, "static_load_kN": 44.5, "fatigue_load_limit_kN": 7.5, "limiting_speed_rpm": 9000, "max_rpm": 9000, "reference_speed_rpm": 5500, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×18 mm with a 13.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 51 kN and C0 44.5 kN; with a C/C0 ratio of 1.15 the 18 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 7.5 kN, the limiting speed 9,000 r/min and the thermal reference speed 5,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.04 kN per millimetre of the 25 mm bore and 2.83 kN per millimetre of the 18 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 180 g (0.19 g per mm² of the 52×18 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 25 mm bore this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 13.5 mm section height between the 25 mm bore and the 52 mm outside diameter SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 51 kN C rating and longer nominal life come without an envelope change. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 52 mm outside diameter and 51 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 25 mm seat, and in heavy industrial gearbox shafts the 180 g mass suits the compact, space-optimised housing. Designers also specify it for rope drums and winch drums, relying on the 18 mm width and the published 44.5 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL182205-XL?", "a": "The SL182205-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 52 mm outside diameter, 25 mm bore and 18 mm width, envelope 25×52×18 mm. Mass is 180 g." }, { "q": "What does the SL182205-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182205-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×52×18 mm and the catalogue ratings are C 51 kN, C0 44.5 kN, Cur 7.5 kN." }, { "q": "What is the load capacity of the SL182205-XL?", "a": "The basic dynamic load rating C is 51 kN and the basic static load rating C0 is 44.5 kN; the fatigue load limit Cur is 7.5 kN." }, { "q": "What is the maximum speed of the SL182205-XL?", "a": "The limiting speed is 9,000 r/min and the thermal reference speed is 5,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182205-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182205-XL", "SL182205-XL" ], "locale_variants": {} }, { "sku": "SL192305-XL", "brand": "FAG", "manufacturer_designation": "SL192305-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 73, "static_load_kN": 59, "fatigue_load_limit_kN": 9.6, "limiting_speed_rpm": 8100, "max_rpm": 8100, "reference_speed_rpm": 4800, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×62×24 mm with a 18.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 73 kN and C0 59 kN; with a C/C0 ratio of 1.24 the 24 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 9.6 kN, the limiting speed 8,100 r/min and the thermal reference speed 4,800 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.92 kN per millimetre of the 25 mm bore and 3.04 kN per millimetre of the 24 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 370 g (0.25 g per mm² of the 62×24 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 25 mm bore this size balances the 62 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 24 mm width versus 62 mm outside diameter gives this series its characteristic squat proportions and high tipping rigidity under eccentric loads As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 9.6 kN Cur value. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 62 mm outside diameter and 73 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 25 mm seat, and in rope drums and winch drums the 370 g mass suits the compact, space-optimised housing. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 24 mm width and the published 59 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL192305-XL?", "a": "The SL192305-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 62 mm outside diameter, 25 mm bore and 24 mm width, envelope 25×62×24 mm. Mass is 370 g." }, { "q": "What does the SL192305-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192305-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×62×24 mm and the catalogue ratings are C 73 kN, C0 59 kN, Cur 9.6 kN." }, { "q": "What is the load capacity of the SL192305-XL?", "a": "The basic dynamic load rating C is 73 kN and the basic static load rating C0 is 59 kN; the fatigue load limit Cur is 9.6 kN." }, { "q": "What is the maximum speed of the SL192305-XL?", "a": "The limiting speed is 8,100 r/min and the thermal reference speed is 4,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192305-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192305-XL", "SL192305-XL" ], "locale_variants": {} }, { "sku": "SL183006-XL", "brand": "FAG", "manufacturer_designation": "SL183006-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45, "static_load_kN": 42, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 8100, "max_rpm": 8100, "reference_speed_rpm": 5600, "weight_g": 200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×55×19 mm with a 12.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 45 kN and C0 42 kN; with a C/C0 ratio of 1.07 the 19 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 7.6 kN, the limiting speed 8,100 r/min and the thermal reference speed 5,600 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.50 kN per millimetre of the 30 mm bore and 2.37 kN per millimetre of the 19 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 200 g (0.19 g per mm² of the 55×19 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 30 mm bore this size balances the 55 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 12.5 mm section height between the 30 mm bore and the 55 mm outside diameter As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 7.6 kN Cur value. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 55 mm outside diameter and 45 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 30 mm seat, and in vibrating and oscillating machinery the 200 g mass suits the compact, space-optimised housing. Designers also specify it for marine and offshore winch arrangements, relying on the 19 mm width and the published 42 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL183006-XL?", "a": "The SL183006-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 55 mm outside diameter, 30 mm bore and 19 mm width, envelope 30×55×19 mm. Mass is 200 g." }, { "q": "What does the SL183006-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183006-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×55×19 mm and the catalogue ratings are C 45 kN, C0 42 kN, Cur 7.6 kN." }, { "q": "What is the load capacity of the SL183006-XL?", "a": "The basic dynamic load rating C is 45 kN and the basic static load rating C0 is 42 kN; the fatigue load limit Cur is 7.6 kN." }, { "q": "What is the maximum speed of the SL183006-XL?", "a": "The limiting speed is 8,100 r/min and the thermal reference speed is 5,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183006-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183006-XL", "SL183006-XL" ], "locale_variants": {} }, { "sku": "SL182206-XL", "brand": "FAG", "manufacturer_designation": "SL182206-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 70, "static_load_kN": 64, "fatigue_load_limit_kN": 10.4, "limiting_speed_rpm": 7400, "max_rpm": 7400, "reference_speed_rpm": 4550, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×20 mm with a 16.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 70 kN and C0 64 kN; with a C/C0 ratio of 1.09 the 20 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 10.4 kN, the limiting speed 7,400 r/min and the thermal reference speed 4,550 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.33 kN per millimetre of the 30 mm bore and 3.50 kN per millimetre of the 20 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 300 g (0.24 g per mm² of the 62×20 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 16.0 mm section height between the 30 mm bore and the 62 mm outside diameter -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 70 kN C rating and longer nominal life come without an envelope change. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 62 mm outside diameter and 70 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 30 mm seat, and in rope drums and winch drums the 300 g mass suits the compact, space-optimised housing. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 20 mm width and the published 64 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL182206-XL?", "a": "The SL182206-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 62 mm outside diameter, 30 mm bore and 20 mm width, envelope 30×62×20 mm. Mass is 300 g." }, { "q": "What does the SL182206-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182206-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×62×20 mm and the catalogue ratings are C 70 kN, C0 64 kN, Cur 10.4 kN." }, { "q": "What is the load capacity of the SL182206-XL?", "a": "The basic dynamic load rating C is 70 kN and the basic static load rating C0 is 64 kN; the fatigue load limit Cur is 10.4 kN." }, { "q": "What is the maximum speed of the SL182206-XL?", "a": "The limiting speed is 7,400 r/min and the thermal reference speed is 4,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182206-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182206-XL", "SL182206-XL" ], "locale_variants": {} }, { "sku": "SL192306-XL", "brand": "FAG", "manufacturer_designation": "SL192306-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 100, "static_load_kN": 87, "fatigue_load_limit_kN": 14.8, "limiting_speed_rpm": 6800, "max_rpm": 6800, "reference_speed_rpm": 4050, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×72×27 mm with a 21.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 100 kN and C0 87 kN; with a C/C0 ratio of 1.15 the 27 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 14.8 kN, the limiting speed 6,800 r/min and the thermal reference speed 4,050 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.33 kN per millimetre of the 30 mm bore and 3.70 kN per millimetre of the 27 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 560 g (0.29 g per mm² of the 72×27 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 30 mm bore this size balances the 72 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity At 6,800 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 100 kN dynamic rating As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 14.8 kN Cur value. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 72 mm outside diameter and 100 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 30 mm seat, and in rolling-mill and steel-industry drives the 560 g mass suits the compact, space-optimised housing. Designers also specify it for construction machinery slewing drives, relying on the 27 mm width and the published 87 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192306-XL?", "a": "The SL192306-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 72 mm outside diameter, 30 mm bore and 27 mm width, envelope 30×72×27 mm. Mass is 560 g." }, { "q": "What does the SL192306-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192306-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×72×27 mm and the catalogue ratings are C 100 kN, C0 87 kN, Cur 14.8 kN." }, { "q": "What is the load capacity of the SL192306-XL?", "a": "The basic dynamic load rating C is 100 kN and the basic static load rating C0 is 87 kN; the fatigue load limit Cur is 14.8 kN." }, { "q": "What is the maximum speed of the SL192306-XL?", "a": "The limiting speed is 6,800 r/min and the thermal reference speed is 4,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192306-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192306-XL", "SL192306-XL" ], "locale_variants": {} }, { "sku": "SL183007-XL", "brand": "FAG", "manufacturer_designation": "SL183007-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 55, "static_load_kN": 53, "fatigue_load_limit_kN": 9.6, "limiting_speed_rpm": 7100, "max_rpm": 7100, "reference_speed_rpm": 4950, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×62×20 mm with a 13.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 55 kN and C0 53 kN; with a C/C0 ratio of 1.04 the 20 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 9.6 kN, the limiting speed 7,100 r/min and the thermal reference speed 4,950 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.57 kN per millimetre of the 35 mm bore and 2.75 kN per millimetre of the 20 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 260 g (0.21 g per mm² of the 62×20 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 13.5 mm section height between the 35 mm bore and the 62 mm outside diameter Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 9.6 kN Cur value. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 62 mm outside diameter and 55 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 35 mm seat, and in hydraulic pumps and radial piston pumps the 260 g mass suits the compact, space-optimised housing. Designers also specify it for material handling conveyor pulleys, relying on the 20 mm width and the published 53 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL183007-XL?", "a": "The SL183007-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 62 mm outside diameter, 35 mm bore and 20 mm width, envelope 35×62×20 mm. Mass is 260 g." }, { "q": "What does the SL183007-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183007-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×62×20 mm and the catalogue ratings are C 55 kN, C0 53 kN, Cur 9.6 kN." }, { "q": "What is the load capacity of the SL183007-XL?", "a": "The basic dynamic load rating C is 55 kN and the basic static load rating C0 is 53 kN; the fatigue load limit Cur is 9.6 kN." }, { "q": "What is the maximum speed of the SL183007-XL?", "a": "The limiting speed is 7,100 r/min and the thermal reference speed is 4,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183007-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183007-XL", "SL183007-XL" ], "locale_variants": {} }, { "sku": "SL182207-XL", "brand": "FAG", "manufacturer_designation": "SL182207-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 88, "static_load_kN": 78, "fatigue_load_limit_kN": 12.9, "limiting_speed_rpm": 6400, "max_rpm": 6400, "reference_speed_rpm": 4250, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×72×23 mm with a 18.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 88 kN and C0 78 kN; with a C/C0 ratio of 1.13 the 23 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 12.9 kN, the limiting speed 6,400 r/min and the thermal reference speed 4,250 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.51 kN per millimetre of the 35 mm bore and 3.83 kN per millimetre of the 23 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 440 g (0.27 g per mm² of the 72×23 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 35 mm bore places this bearing in the medium band, where the 72 mm envelope already carries ratings in the tens of kilonewtons The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 18.5 mm section height between the 35 mm bore and the 72 mm outside diameter Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 88 kN C rating and longer nominal life come without an envelope change. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 72 mm outside diameter and 88 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 35 mm seat, and in rolling-mill and steel-industry drives the 440 g mass suits the compact, space-optimised housing. Designers also specify it for construction machinery slewing drives, relying on the 23 mm width and the published 78 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL182207-XL?", "a": "The SL182207-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 72 mm outside diameter, 35 mm bore and 23 mm width, envelope 35×72×23 mm. Mass is 440 g." }, { "q": "What does the SL182207-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182207-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×72×23 mm and the catalogue ratings are C 88 kN, C0 78 kN, Cur 12.9 kN." }, { "q": "What is the load capacity of the SL182207-XL?", "a": "The basic dynamic load rating C is 88 kN and the basic static load rating C0 is 78 kN; the fatigue load limit Cur is 12.9 kN." }, { "q": "What is the maximum speed of the SL182207-XL?", "a": "The limiting speed is 6,400 r/min and the thermal reference speed is 4,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182207-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182207-XL", "SL182207-XL" ], "locale_variants": {} }, { "sku": "SL192307-XL", "brand": "FAG", "manufacturer_designation": "SL192307-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 126, "static_load_kN": 110, "fatigue_load_limit_kN": 20.5, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3600, "weight_g": 740, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×80×31 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 126 kN and C0 110 kN; with a C/C0 ratio of 1.15 the 31 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 20.5 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,600 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.60 kN per millimetre of the 35 mm bore and 4.06 kN per millimetre of the 31 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 740 g (0.30 g per mm² of the 80×31 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 31 mm width as a standard mounting space At 5,800 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 126 kN dynamic rating SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 110 kN at 35 mm bore — for slow heavy positions As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 20.5 kN Cur value. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 80 mm outside diameter and 126 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 35 mm seat, and in planetary gear bearing positions the 740 g mass suits the compact, space-optimised housing. Designers also specify it for crane travelling-wheel mechanisms, relying on the 31 mm width and the published 110 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL192307-XL?", "a": "The SL192307-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 80 mm outside diameter, 35 mm bore and 31 mm width, envelope 35×80×31 mm. Mass is 740 g." }, { "q": "What does the SL192307-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192307-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×80×31 mm and the catalogue ratings are C 126 kN, C0 110 kN, Cur 20.5 kN." }, { "q": "What is the load capacity of the SL192307-XL?", "a": "The basic dynamic load rating C is 126 kN and the basic static load rating C0 is 110 kN; the fatigue load limit Cur is 20.5 kN." }, { "q": "What is the maximum speed of the SL192307-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192307-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192307-XL", "SL192307-XL" ], "locale_variants": {} }, { "sku": "SL183008-XL", "brand": "FAG", "manufacturer_designation": "SL183008-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 66, "static_load_kN": 67, "fatigue_load_limit_kN": 11.4, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 4350, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×68×21 mm with a 14.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 66 kN and C0 67 kN; with a C/C0 ratio of 0.99 the 21 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 11.4 kN, the limiting speed 6,300 r/min and the thermal reference speed 4,350 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.65 kN per millimetre of the 40 mm bore and 3.14 kN per millimetre of the 21 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 310 g (0.22 g per mm² of the 68×21 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 40 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 21 mm width as a standard mounting space Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value High radial rigidity at 66 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11.4 kN Cur value. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 68 mm outside diameter and 66 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 40 mm seat, and in construction machinery slewing drives the 310 g mass suits the compact, space-optimised housing. Designers also specify it for compact slow-speed agitator drives, relying on the 21 mm width and the published 67 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL183008-XL?", "a": "The SL183008-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 68 mm outside diameter, 40 mm bore and 21 mm width, envelope 40×68×21 mm. Mass is 310 g." }, { "q": "What does the SL183008-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183008-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×68×21 mm and the catalogue ratings are C 66 kN, C0 67 kN, Cur 11.4 kN." }, { "q": "What is the load capacity of the SL183008-XL?", "a": "The basic dynamic load rating C is 66 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 11.4 kN." }, { "q": "What is the maximum speed of the SL183008-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 4,350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183008-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183008-XL", "SL183008-XL" ], "locale_variants": {} }, { "sku": "SL182208-XL", "brand": "FAG", "manufacturer_designation": "SL182208-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 97, "static_load_kN": 91, "fatigue_load_limit_kN": 15.2, "limiting_speed_rpm": 5600, "max_rpm": 5600, "reference_speed_rpm": 3650, "weight_g": 550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×80×23 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 97 kN and C0 91 kN; with a C/C0 ratio of 1.07 the 23 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 15.2 kN, the limiting speed 5,600 r/min and the thermal reference speed 3,650 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.42 kN per millimetre of the 40 mm bore and 4.22 kN per millimetre of the 23 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 550 g (0.30 g per mm² of the 80×23 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 40 mm bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 40×80×23 mm envelope. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 80 mm outside diameter and 97 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 40 mm seat, and in vibrating and oscillating machinery the 550 g mass suits the compact, space-optimised housing. Designers also specify it for marine and offshore winch arrangements, relying on the 23 mm width and the published 91 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182208-XL?", "a": "The SL182208-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 80 mm outside diameter, 40 mm bore and 23 mm width, envelope 40×80×23 mm. Mass is 550 g." }, { "q": "What does the SL182208-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182208-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×80×23 mm and the catalogue ratings are C 97 kN, C0 91 kN, Cur 15.2 kN." }, { "q": "What is the load capacity of the SL182208-XL?", "a": "The basic dynamic load rating C is 97 kN and the basic static load rating C0 is 91 kN; the fatigue load limit Cur is 15.2 kN." }, { "q": "What is the maximum speed of the SL182208-XL?", "a": "The limiting speed is 5,600 r/min and the thermal reference speed is 3,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182208-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182208-XL", "SL182208-XL" ], "locale_variants": {} }, { "sku": "SL192308-XL", "brand": "FAG", "manufacturer_designation": "SL192308-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 170, "static_load_kN": 153, "fatigue_load_limit_kN": 29, "limiting_speed_rpm": 5000, "max_rpm": 5000, "reference_speed_rpm": 3050, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×90×33 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 170 kN and C0 153 kN; with a C/C0 ratio of 1.11 the 33 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 29 kN, the limiting speed 5,000 r/min and the thermal reference speed 3,050 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.25 kN per millimetre of the 40 mm bore and 5.15 kN per millimetre of the 33 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.01 kg (1010 g) (0.34 g per mm² of the 90×33 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 40 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 33 mm width as a standard mounting space Large SL1923 sizes in HR1 are typically the TB design with oxide-finished surfaces; the 1.01 kg mass reflects the thick, deformation-resistant rings At 5,000 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 170 kN dynamic rating -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 170 kN C rating and longer nominal life come without an envelope change. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 90 mm outside diameter and 170 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 40 mm seat, and in hydraulic pumps and radial piston pumps the 1.01 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 33 mm width and the published 153 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192308-XL?", "a": "The SL192308-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 90 mm outside diameter, 40 mm bore and 33 mm width, envelope 40×90×33 mm. Mass is 1.01 kg." }, { "q": "What does the SL192308-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192308-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×90×33 mm and the catalogue ratings are C 170 kN, C0 153 kN, Cur 29 kN." }, { "q": "What is the load capacity of the SL192308-XL?", "a": "The basic dynamic load rating C is 170 kN and the basic static load rating C0 is 153 kN; the fatigue load limit Cur is 29 kN." }, { "q": "What is the maximum speed of the SL192308-XL?", "a": "The limiting speed is 5,000 r/min and the thermal reference speed is 3,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192308-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192308-XL", "SL192308-XL" ], "locale_variants": {} }, { "sku": "SL183009-XL", "brand": "FAG", "manufacturer_designation": "SL183009-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 70, "static_load_kN": 74, "fatigue_load_limit_kN": 12.7, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 4200, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×75×23 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 70 kN and C0 74 kN; with a C/C0 ratio of 0.95 the 23 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 12.7 kN, the limiting speed 5,800 r/min and the thermal reference speed 4,200 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.56 kN per millimetre of the 45 mm bore and 3.04 kN per millimetre of the 23 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 400 g (0.23 g per mm² of the 75×23 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 45 mm bore places this bearing in the medium band, where the 75 mm envelope already carries ratings in the tens of kilonewtons High radial rigidity at 70 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 15.0 mm section height between the 45 mm bore and the 75 mm outside diameter -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 70 kN C rating and longer nominal life come without an envelope change. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 75 mm outside diameter and 70 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 45 mm seat, and in rope drums and winch drums the 400 g mass suits the compact, space-optimised housing. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 23 mm width and the published 74 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL183009-XL?", "a": "The SL183009-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 75 mm outside diameter, 45 mm bore and 23 mm width, envelope 45×75×23 mm. Mass is 400 g." }, { "q": "What does the SL183009-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183009-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×75×23 mm and the catalogue ratings are C 70 kN, C0 74 kN, Cur 12.7 kN." }, { "q": "What is the load capacity of the SL183009-XL?", "a": "The basic dynamic load rating C is 70 kN and the basic static load rating C0 is 74 kN; the fatigue load limit Cur is 12.7 kN." }, { "q": "What is the maximum speed of the SL183009-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 4,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183009-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183009-XL", "SL183009-XL" ], "locale_variants": {} }, { "sku": "SL182209-XL", "brand": "FAG", "manufacturer_designation": "SL182209-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 101, "static_load_kN": 98, "fatigue_load_limit_kN": 16.3, "limiting_speed_rpm": 5300, "max_rpm": 5300, "reference_speed_rpm": 3450, "weight_g": 590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×85×23 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 101 kN and C0 98 kN; with a C/C0 ratio of 1.03 the 23 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 16.3 kN, the limiting speed 5,300 r/min and the thermal reference speed 3,450 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.24 kN per millimetre of the 45 mm bore and 4.39 kN per millimetre of the 23 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 590 g (0.30 g per mm² of the 85×23 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 45 mm bore places this bearing in the medium band, where the 85 mm envelope already carries ratings in the tens of kilonewtons SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly In the 85 mm envelope the cageless pack raises C0 to 98 kN; the trade is the 5,300 r/min limiting speed, set by roller-to-roller sliding rather than by a cage The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 45×85×23 mm envelope. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 85 mm outside diameter and 101 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 45 mm seat, and in hydraulic pumps and radial piston pumps the 590 g mass suits the compact, space-optimised housing. Designers also specify it for material handling conveyor pulleys, relying on the 23 mm width and the published 98 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL182209-XL?", "a": "The SL182209-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 85 mm outside diameter, 45 mm bore and 23 mm width, envelope 45×85×23 mm. Mass is 590 g." }, { "q": "What does the SL182209-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182209-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×85×23 mm and the catalogue ratings are C 101 kN, C0 98 kN, Cur 16.3 kN." }, { "q": "What is the load capacity of the SL182209-XL?", "a": "The basic dynamic load rating C is 101 kN and the basic static load rating C0 is 98 kN; the fatigue load limit Cur is 16.3 kN." }, { "q": "What is the maximum speed of the SL182209-XL?", "a": "The limiting speed is 5,300 r/min and the thermal reference speed is 3,450 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182209-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182209-XL", "SL182209-XL" ], "locale_variants": {} }, { "sku": "SL192309-XL", "brand": "FAG", "manufacturer_designation": "SL192309-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 181, "static_load_kN": 164, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 3000, "weight_g": 1370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×100×36 mm with a 27.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 181 kN and C0 164 kN; with a C/C0 ratio of 1.10 the 36 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 31 kN, the limiting speed 4,600 r/min and the thermal reference speed 3,000 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.02 kN per millimetre of the 45 mm bore and 5.03 kN per millimetre of the 36 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.37 kg (1370 g) (0.38 g per mm² of the 100×36 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 45 mm bore places this bearing in the medium band, where the 100 mm envelope already carries ratings in the tens of kilonewtons SL192309-XL is the wide dimension-series 23 execution of the single-row full-complement principle: a markedly wider 36 mm ring carries more and longer rollers than the 29/30-series sizes -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 181 kN C rating and longer nominal life come without an envelope change. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 100 mm outside diameter and 181 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 45 mm seat, and in material handling conveyor pulleys the 1.37 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 36 mm width and the published 164 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL192309-XL?", "a": "The SL192309-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 100 mm outside diameter, 45 mm bore and 36 mm width, envelope 45×100×36 mm. Mass is 1.37 kg." }, { "q": "What does the SL192309-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192309-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×100×36 mm and the catalogue ratings are C 181 kN, C0 164 kN, Cur 31 kN." }, { "q": "What is the load capacity of the SL192309-XL?", "a": "The basic dynamic load rating C is 181 kN and the basic static load rating C0 is 164 kN; the fatigue load limit Cur is 31 kN." }, { "q": "What is the maximum speed of the SL192309-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 3,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192309-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192309-XL", "SL192309-XL" ], "locale_variants": {} }, { "sku": "SL183010-XL", "brand": "FAG", "manufacturer_designation": "SL183010-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 88, "static_load_kN": 94, "fatigue_load_limit_kN": 15.3, "limiting_speed_rpm": 5300, "max_rpm": 5300, "reference_speed_rpm": 3700, "weight_g": 430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×80×23 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 88 kN and C0 94 kN; with a C/C0 ratio of 0.94 the 23 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 15.3 kN, the limiting speed 5,300 r/min and the thermal reference speed 3,700 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.76 kN per millimetre of the 50 mm bore and 3.83 kN per millimetre of the 23 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 430 g (0.23 g per mm² of the 80×23 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 50 mm bore marks the medium range: mounting forces and fits become critical, and the 430 g mass calls for proper induction or press tooling rather than hand fitting The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion SL183010-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 5,300 r/min limit. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 80 mm outside diameter and 88 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 50 mm seat, and in crane travelling-wheel mechanisms the 430 g mass suits the compact, space-optimised housing. Designers also specify it for vibrating and oscillating machinery, relying on the 23 mm width and the published 94 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL183010-XL?", "a": "The SL183010-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 80 mm outside diameter, 50 mm bore and 23 mm width, envelope 50×80×23 mm. Mass is 430 g." }, { "q": "What does the SL183010-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183010-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×80×23 mm and the catalogue ratings are C 88 kN, C0 94 kN, Cur 15.3 kN." }, { "q": "What is the load capacity of the SL183010-XL?", "a": "The basic dynamic load rating C is 88 kN and the basic static load rating C0 is 94 kN; the fatigue load limit Cur is 15.3 kN." }, { "q": "What is the maximum speed of the SL183010-XL?", "a": "The limiting speed is 5,300 r/min and the thermal reference speed is 3,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183010-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183010-XL", "SL183010-XL" ], "locale_variants": {} }, { "sku": "SL182210-XL", "brand": "FAG", "manufacturer_designation": "SL182210-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 109, "static_load_kN": 111, "fatigue_load_limit_kN": 18.5, "limiting_speed_rpm": 4750, "max_rpm": 4750, "reference_speed_rpm": 3000, "weight_g": 640, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×90×23 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 109 kN and C0 111 kN; with a C/C0 ratio of 0.98 the 23 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 18.5 kN, the limiting speed 4,750 r/min and the thermal reference speed 3,000 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.18 kN per millimetre of the 50 mm bore and 4.74 kN per millimetre of the 23 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 640 g (0.31 g per mm² of the 90×23 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 50 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 23 mm width as a standard mounting space The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 20.0 mm section height between the 50 mm bore and the 90 mm outside diameter The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 18.5 kN Cur value. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 90 mm outside diameter and 109 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 50 mm seat, and in hydraulic pumps and radial piston pumps the 640 g mass suits the compact, space-optimised housing. Designers also specify it for material handling conveyor pulleys, relying on the 23 mm width and the published 111 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182210-XL?", "a": "The SL182210-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 90 mm outside diameter, 50 mm bore and 23 mm width, envelope 50×90×23 mm. Mass is 640 g." }, { "q": "What does the SL182210-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182210-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×90×23 mm and the catalogue ratings are C 109 kN, C0 111 kN, Cur 18.5 kN." }, { "q": "What is the load capacity of the SL182210-XL?", "a": "The basic dynamic load rating C is 109 kN and the basic static load rating C0 is 111 kN; the fatigue load limit Cur is 18.5 kN." }, { "q": "What is the maximum speed of the SL182210-XL?", "a": "The limiting speed is 4,750 r/min and the thermal reference speed is 3,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182210-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182210-XL", "SL182210-XL" ], "locale_variants": {} }, { "sku": "SL192310-XL", "brand": "FAG", "manufacturer_designation": "SL192310-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 232, "static_load_kN": 215, "fatigue_load_limit_kN": 41, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2800, "weight_g": 1810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×110×40 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 232 kN and C0 215 kN; with a C/C0 ratio of 1.08 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 41 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,800 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.64 kN per millimetre of the 50 mm bore and 5.80 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.81 kg (1810 g) (0.41 g per mm² of the 110×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 50 mm bore marks the medium range: mounting forces and fits become critical, and the 1810 g mass calls for proper induction or press tooling rather than hand fitting SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 215 kN at 50 mm bore — for slow heavy positions Large SL1923 sizes in HR1 are typically the TB design with oxide-finished surfaces; the 1.81 kg mass reflects the thick, deformation-resistant rings X-life status (-XL) indicates the current Schaeffler premium execution at 50 mm bore; the 215 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 110 mm outside diameter and 232 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 50 mm seat, and in construction machinery slewing drives the 1.81 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 40 mm width and the published 215 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL192310-XL?", "a": "The SL192310-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 110 mm outside diameter, 50 mm bore and 40 mm width, envelope 50×110×40 mm. Mass is 1.81 kg." }, { "q": "What does the SL192310-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192310-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×110×40 mm and the catalogue ratings are C 232 kN, C0 215 kN, Cur 41 kN." }, { "q": "What is the load capacity of the SL192310-XL?", "a": "The basic dynamic load rating C is 232 kN and the basic static load rating C0 is 215 kN; the fatigue load limit Cur is 41 kN." }, { "q": "What is the maximum speed of the SL192310-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192310-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192310", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192310-XL", "SL192310-XL" ], "locale_variants": {} }, { "sku": "SL183011-XL", "brand": "FAG", "manufacturer_designation": "SL183011-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 120, "static_load_kN": 136, "fatigue_load_limit_kN": 23, "limiting_speed_rpm": 4550, "max_rpm": 4550, "reference_speed_rpm": 3100, "weight_g": 640, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×90×26 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 120 kN and C0 136 kN; with a C/C0 ratio of 0.88 the 26 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 23 kN, the limiting speed 4,550 r/min and the thermal reference speed 3,100 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.18 kN per millimetre of the 55 mm bore and 4.62 kN per millimetre of the 26 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 640 g (0.27 g per mm² of the 90×26 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 55 mm bore marks the medium range: mounting forces and fits become critical, and the 640 g mass calls for proper induction or press tooling rather than hand fitting SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly In the 90 mm envelope the cageless pack raises C0 to 136 kN; the trade is the 4,550 r/min limiting speed, set by roller-to-roller sliding rather than by a cage X-life status (-XL) indicates the current Schaeffler premium execution at 55 mm bore; the 136 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 90 mm outside diameter and 120 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 55 mm seat, and in material handling conveyor pulleys the 640 g mass suits the compact, space-optimised housing. Designers also specify it for planetary gear bearing positions, relying on the 26 mm width and the published 136 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL183011-XL?", "a": "The SL183011-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 90 mm outside diameter, 55 mm bore and 26 mm width, envelope 55×90×26 mm. Mass is 640 g." }, { "q": "What does the SL183011-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183011-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×90×26 mm and the catalogue ratings are C 120 kN, C0 136 kN, Cur 23 kN." }, { "q": "What is the load capacity of the SL183011-XL?", "a": "The basic dynamic load rating C is 120 kN and the basic static load rating C0 is 136 kN; the fatigue load limit Cur is 23 kN." }, { "q": "What is the maximum speed of the SL183011-XL?", "a": "The limiting speed is 4,550 r/min and the thermal reference speed is 3,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183011-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183011-XL", "SL183011-XL" ], "locale_variants": {} }, { "sku": "SL182211-XL", "brand": "FAG", "manufacturer_designation": "SL182211-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 140, "static_load_kN": 148, "fatigue_load_limit_kN": 25.5, "limiting_speed_rpm": 4350, "max_rpm": 4350, "reference_speed_rpm": 2700, "weight_g": 870, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×100×25 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 140 kN and C0 148 kN; with a C/C0 ratio of 0.95 the 25 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 25.5 kN, the limiting speed 4,350 r/min and the thermal reference speed 2,700 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.55 kN per millimetre of the 55 mm bore and 5.60 kN per millimetre of the 25 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 870 g (0.35 g per mm² of the 100×25 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 55 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 25 mm width as a standard mounting space High radial rigidity at 140 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 22.5 mm section height between the 55 mm bore and the 100 mm outside diameter As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 25.5 kN Cur value. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 100 mm outside diameter and 140 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 55 mm seat, and in construction machinery slewing drives the 870 g mass suits the compact, space-optimised housing. Designers also specify it for compact slow-speed agitator drives, relying on the 25 mm width and the published 148 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182211-XL?", "a": "The SL182211-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 100 mm outside diameter, 55 mm bore and 25 mm width, envelope 55×100×25 mm. Mass is 870 g." }, { "q": "What does the SL182211-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182211-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×100×25 mm and the catalogue ratings are C 140 kN, C0 148 kN, Cur 25.5 kN." }, { "q": "What is the load capacity of the SL182211-XL?", "a": "The basic dynamic load rating C is 140 kN and the basic static load rating C0 is 148 kN; the fatigue load limit Cur is 25.5 kN." }, { "q": "What is the maximum speed of the SL182211-XL?", "a": "The limiting speed is 4,350 r/min and the thermal reference speed is 2,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182211-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182211-XL", "SL182211-XL" ], "locale_variants": {} }, { "sku": "SL192311-XL", "brand": "FAG", "manufacturer_designation": "SL192311-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 270, "static_load_kN": 250, "fatigue_load_limit_kN": 48.5, "limiting_speed_rpm": 3750, "max_rpm": 3750, "reference_speed_rpm": 2550, "weight_g": 2280, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×120×43 mm with a 32.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 270 kN and C0 250 kN; with a C/C0 ratio of 1.08 the 43 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 48.5 kN, the limiting speed 3,750 r/min and the thermal reference speed 2,550 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.91 kN per millimetre of the 55 mm bore and 6.28 kN per millimetre of the 43 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.28 kg (2280 g) (0.44 g per mm² of the 120×43 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 55 mm bore marks the medium range: mounting forces and fits become critical, and the 2280 g mass calls for proper induction or press tooling rather than hand fitting At 3,750 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 270 kN dynamic rating X-life status (-XL) indicates the current Schaeffler premium execution at 55 mm bore; the 250 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 120 mm outside diameter and 270 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 55 mm seat, and in crane travelling-wheel mechanisms the 2.28 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 43 mm width and the published 250 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL192311-XL?", "a": "The SL192311-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 120 mm outside diameter, 55 mm bore and 43 mm width, envelope 55×120×43 mm. Mass is 2.28 kg." }, { "q": "What does the SL192311-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192311-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×120×43 mm and the catalogue ratings are C 270 kN, C0 250 kN, Cur 48.5 kN." }, { "q": "What is the load capacity of the SL192311-XL?", "a": "The basic dynamic load rating C is 270 kN and the basic static load rating C0 is 250 kN; the fatigue load limit Cur is 48.5 kN." }, { "q": "What is the maximum speed of the SL192311-XL?", "a": "The limiting speed is 3,750 r/min and the thermal reference speed is 2,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192311-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192311-XL", "SL192311-XL" ], "locale_variants": {} }, { "sku": "SL182912-XL", "brand": "FAG", "manufacturer_designation": "SL182912-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 85, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 63, "static_load_kN": 76, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 4700, "max_rpm": 4700, "reference_speed_rpm": 2900, "weight_g": 290, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×85×16 mm with a 12.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 63 kN and C0 76 kN; with a C/C0 ratio of 0.83 the 16 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 13.9 kN, the limiting speed 4,700 r/min and the thermal reference speed 2,900 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.05 kN per millimetre of the 60 mm bore and 3.94 kN per millimetre of the 16 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 290 g (0.21 g per mm² of the 85×16 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 60 mm bore marks the medium range: mounting forces and fits become critical, and the 290 g mass calls for proper induction or press tooling rather than hand fitting SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 60×85×16 mm envelope. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 85 mm outside diameter and 63 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 60 mm seat, and in marine and offshore winch arrangements the 290 g mass suits the compact, space-optimised housing. Designers also specify it for rolling-mill and steel-industry drives, relying on the 16 mm width and the published 76 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182912-XL?", "a": "The SL182912-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 85 mm outside diameter, 60 mm bore and 16 mm width, envelope 60×85×16 mm. Mass is 290 g." }, { "q": "What does the SL182912-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182912-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×85×16 mm and the catalogue ratings are C 63 kN, C0 76 kN, Cur 13.9 kN." }, { "q": "What is the load capacity of the SL182912-XL?", "a": "The basic dynamic load rating C is 63 kN and the basic static load rating C0 is 76 kN; the fatigue load limit Cur is 13.9 kN." }, { "q": "What is the maximum speed of the SL182912-XL?", "a": "The limiting speed is 4,700 r/min and the thermal reference speed is 2,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182912-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182912", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182912-XL", "SL182912-XL" ], "locale_variants": {} }, { "sku": "SL183012-XL", "brand": "FAG", "manufacturer_designation": "SL183012-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 123, "static_load_kN": 143, "fatigue_load_limit_kN": 24.1, "limiting_speed_rpm": 4350, "max_rpm": 4350, "reference_speed_rpm": 3000, "weight_g": 690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×95×26 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 123 kN and C0 143 kN; with a C/C0 ratio of 0.86 the 26 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 24.1 kN, the limiting speed 4,350 r/min and the thermal reference speed 3,000 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.05 kN per millimetre of the 60 mm bore and 4.73 kN per millimetre of the 26 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 690 g (0.28 g per mm² of the 95×26 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 60 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 26 mm width as a standard mounting space High radial rigidity at 123 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery SL183012-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs X-life status (-XL) indicates the current Schaeffler premium execution at 60 mm bore; the 143 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 95 mm outside diameter and 123 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 60 mm seat, and in planetary gear bearing positions the 690 g mass suits the compact, space-optimised housing. Designers also specify it for crane travelling-wheel mechanisms, relying on the 26 mm width and the published 143 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL183012-XL?", "a": "The SL183012-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 95 mm outside diameter, 60 mm bore and 26 mm width, envelope 60×95×26 mm. Mass is 690 g." }, { "q": "What does the SL183012-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183012-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×95×26 mm and the catalogue ratings are C 123 kN, C0 143 kN, Cur 24.1 kN." }, { "q": "What is the load capacity of the SL183012-XL?", "a": "The basic dynamic load rating C is 123 kN and the basic static load rating C0 is 143 kN; the fatigue load limit Cur is 24.1 kN." }, { "q": "What is the maximum speed of the SL183012-XL?", "a": "The limiting speed is 4,350 r/min and the thermal reference speed is 3,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183012-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183012-XL", "SL183012-XL" ], "locale_variants": {} }, { "sku": "SL182212-XL", "brand": "FAG", "manufacturer_designation": "SL182212-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 169, "static_load_kN": 176, "fatigue_load_limit_kN": 33, "limiting_speed_rpm": 3900, "max_rpm": 3900, "reference_speed_rpm": 2550, "weight_g": 1180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×110×28 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 169 kN and C0 176 kN; with a C/C0 ratio of 0.96 the 28 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 33 kN, the limiting speed 3,900 r/min and the thermal reference speed 2,550 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.82 kN per millimetre of the 60 mm bore and 6.04 kN per millimetre of the 28 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.18 kg (1180 g) (0.38 g per mm² of the 110×28 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 60 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 28 mm width as a standard mounting space High radial rigidity at 169 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery SL182212-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 33 kN Cur value. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 110 mm outside diameter and 169 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 60 mm seat, and in crane travelling-wheel mechanisms the 1.18 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 28 mm width and the published 176 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182212-XL?", "a": "The SL182212-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 110 mm outside diameter, 60 mm bore and 28 mm width, envelope 60×110×28 mm. Mass is 1.18 kg." }, { "q": "What does the SL182212-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182212-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×110×28 mm and the catalogue ratings are C 169 kN, C0 176 kN, Cur 33 kN." }, { "q": "What is the load capacity of the SL182212-XL?", "a": "The basic dynamic load rating C is 169 kN and the basic static load rating C0 is 176 kN; the fatigue load limit Cur is 33 kN." }, { "q": "What is the maximum speed of the SL182212-XL?", "a": "The limiting speed is 3,900 r/min and the thermal reference speed is 2,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182212-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182212-XL", "SL182212-XL" ], "locale_variants": {} }, { "sku": "SL192312-XL", "brand": "FAG", "manufacturer_designation": "SL192312-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 285, "static_load_kN": 275, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 3500, "max_rpm": 3500, "reference_speed_rpm": 2480, "weight_g": 2880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×130×46 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 285 kN and C0 275 kN; with a C/C0 ratio of 1.04 the 46 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 54 kN, the limiting speed 3,500 r/min and the thermal reference speed 2,480 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.75 kN per millimetre of the 60 mm bore and 6.20 kN per millimetre of the 46 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.88 kg (2880 g) (0.48 g per mm² of the 130×46 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 60 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 46 mm width as a standard mounting space The separable inner-ring/roller assembly and the single-flanged outer ring allow this bearing to be used as the floating or one-direction-locating position in a two-bearing shaft system Large SL1923 sizes in HR1 are typically the TB design with oxide-finished surfaces; the 2.88 kg mass reflects the thick, deformation-resistant rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 54 kN Cur value. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 130 mm outside diameter and 285 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 60 mm seat, and in rolling-mill and steel-industry drives the 2.88 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 46 mm width and the published 275 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL192312-XL?", "a": "The SL192312-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 130 mm outside diameter, 60 mm bore and 46 mm width, envelope 60×130×46 mm. Mass is 2.88 kg." }, { "q": "What does the SL192312-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192312-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×130×46 mm and the catalogue ratings are C 285 kN, C0 275 kN, Cur 54 kN." }, { "q": "What is the load capacity of the SL192312-XL?", "a": "The basic dynamic load rating C is 285 kN and the basic static load rating C0 is 275 kN; the fatigue load limit Cur is 54 kN." }, { "q": "What is the maximum speed of the SL192312-XL?", "a": "The limiting speed is 3,500 r/min and the thermal reference speed is 2,480 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192312-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192312", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192312-XL", "SL192312-XL" ], "locale_variants": {} }, { "sku": "SL182913-XL", "brand": "FAG", "manufacturer_designation": "SL182913-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 90, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 67, "static_load_kN": 84, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 4250, "max_rpm": 4250, "reference_speed_rpm": 2550, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×90×16 mm with a 12.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 67 kN and C0 84 kN; with a C/C0 ratio of 0.80 the 16 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 15.4 kN, the limiting speed 4,250 r/min and the thermal reference speed 2,550 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.03 kN per millimetre of the 65 mm bore and 4.19 kN per millimetre of the 16 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 310 g (0.22 g per mm² of the 90×16 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 65 mm bore this is a heavy-industrial bearing: 310 g of stiff ring and roller set, specified where rigidity matters more than speed Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value In the 90 mm envelope the cageless pack raises C0 to 84 kN; the trade is the 4,250 r/min limiting speed, set by roller-to-roller sliding rather than by a cage The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 65×90×16 mm envelope. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 90 mm outside diameter and 67 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 65 mm seat, and in material handling conveyor pulleys the 310 g mass suits the compact, space-optimised housing. Designers also specify it for planetary gear bearing positions, relying on the 16 mm width and the published 84 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182913-XL?", "a": "The SL182913-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 90 mm outside diameter, 65 mm bore and 16 mm width, envelope 65×90×16 mm. Mass is 310 g." }, { "q": "What does the SL182913-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182913-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×90×16 mm and the catalogue ratings are C 67 kN, C0 84 kN, Cur 15.4 kN." }, { "q": "What is the load capacity of the SL182913-XL?", "a": "The basic dynamic load rating C is 67 kN and the basic static load rating C0 is 84 kN; the fatigue load limit Cur is 15.4 kN." }, { "q": "What is the maximum speed of the SL182913-XL?", "a": "The limiting speed is 4,250 r/min and the thermal reference speed is 2,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182913-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182913", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182913-XL", "SL182913-XL" ], "locale_variants": {} }, { "sku": "SL183013-XL", "brand": "FAG", "manufacturer_designation": "SL183013-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 130, "static_load_kN": 157, "fatigue_load_limit_kN": 26.5, "limiting_speed_rpm": 4000, "max_rpm": 4000, "reference_speed_rpm": 2700, "weight_g": 730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×100×26 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 130 kN and C0 157 kN; with a C/C0 ratio of 0.83 the 26 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 26.5 kN, the limiting speed 4,000 r/min and the thermal reference speed 2,700 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.00 kN per millimetre of the 65 mm bore and 5.00 kN per millimetre of the 26 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 730 g (0.28 g per mm² of the 100×26 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 65 mm bore the 100 mm outside diameter and 26 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,000 r/min SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly SL183013-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs X-life status (-XL) indicates the current Schaeffler premium execution at 65 mm bore; the 157 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 100 mm outside diameter and 130 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 65 mm seat, and in heavy industrial gearbox shafts the 730 g mass suits the compact, space-optimised housing. Designers also specify it for rope drums and winch drums, relying on the 26 mm width and the published 157 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL183013-XL?", "a": "The SL183013-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 100 mm outside diameter, 65 mm bore and 26 mm width, envelope 65×100×26 mm. Mass is 730 g." }, { "q": "What does the SL183013-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183013-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×100×26 mm and the catalogue ratings are C 130 kN, C0 157 kN, Cur 26.5 kN." }, { "q": "What is the load capacity of the SL183013-XL?", "a": "The basic dynamic load rating C is 130 kN and the basic static load rating C0 is 157 kN; the fatigue load limit Cur is 26.5 kN." }, { "q": "What is the maximum speed of the SL183013-XL?", "a": "The limiting speed is 4,000 r/min and the thermal reference speed is 2,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183013-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183013-XL", "SL183013-XL" ], "locale_variants": {} }, { "sku": "SL182213-XL", "brand": "FAG", "manufacturer_designation": "SL182213-XL", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 198, "static_load_kN": 210, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3650, "max_rpm": 3650, "reference_speed_rpm": 2480, "weight_g": 1570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×120×31 mm with a 27.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 198 kN and C0 210 kN; with a C/C0 ratio of 0.94 the 31 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 39.5 kN, the limiting speed 3,650 r/min and the thermal reference speed 2,480 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.05 kN per millimetre of the 65 mm bore and 6.39 kN per millimetre of the 31 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.57 kg (1570 g) (0.42 g per mm² of the 120×31 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 65 mm bore the 120 mm outside diameter and 31 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,650 r/min SL182213-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 198 kN C rating and longer nominal life come without an envelope change. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 120 mm outside diameter and 198 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 65 mm seat, and in material handling conveyor pulleys the 1.57 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 31 mm width and the published 210 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182213-XL?", "a": "The SL182213-XL is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 120 mm outside diameter, 65 mm bore and 31 mm width, envelope 65×120×31 mm. Mass is 1.57 kg." }, { "q": "What does the SL182213-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182213-XL identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×120×31 mm and the catalogue ratings are C 198 kN, C0 210 kN, Cur 39.5 kN." }, { "q": "What is the load capacity of the SL182213-XL?", "a": "The basic dynamic load rating C is 198 kN and the basic static load rating C0 is 210 kN; the fatigue load limit Cur is 39.5 kN." }, { "q": "What is the maximum speed of the SL182213-XL?", "a": "The limiting speed is 3,650 r/min and the thermal reference speed is 2,480 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182213-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182213-XL", "SL182213-XL" ], "locale_variants": {} }, { "sku": "SL192313-XL", "brand": "FAG", "manufacturer_designation": "SL192313-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 350, "static_load_kN": 345, "fatigue_load_limit_kN": 67, "limiting_speed_rpm": 3200, "max_rpm": 3200, "reference_speed_rpm": 2180, "weight_g": 3520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×140×48 mm with a 37.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 350 kN and C0 345 kN; with a C/C0 ratio of 1.01 the 48 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 67 kN, the limiting speed 3,200 r/min and the thermal reference speed 2,180 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.38 kN per millimetre of the 65 mm bore and 7.29 kN per millimetre of the 48 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.52 kg (3520 g) (0.52 g per mm² of the 140×48 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 65 mm bore the 140 mm outside diameter and 48 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,200 r/min The 48 mm width versus 140 mm outside diameter gives this series its characteristic squat proportions and high tipping rigidity under eccentric loads Large SL1923 sizes in HR1 are typically the TB design with oxide-finished surfaces; the 3.52 kg mass reflects the thick, deformation-resistant rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 67 kN Cur value. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 140 mm outside diameter and 350 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 65 mm seat, and in planetary gear bearing positions the 3.52 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 48 mm width and the published 345 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL192313-XL?", "a": "The SL192313-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 140 mm outside diameter, 65 mm bore and 48 mm width, envelope 65×140×48 mm. Mass is 3.52 kg." }, { "q": "What does the SL192313-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192313-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×140×48 mm and the catalogue ratings are C 350 kN, C0 345 kN, Cur 67 kN." }, { "q": "What is the load capacity of the SL192313-XL?", "a": "The basic dynamic load rating C is 350 kN and the basic static load rating C0 is 345 kN; the fatigue load limit Cur is 67 kN." }, { "q": "What is the maximum speed of the SL192313-XL?", "a": "The limiting speed is 3,200 r/min and the thermal reference speed is 2,180 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192313-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=519", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192313-XL", "SL192313-XL" ], "locale_variants": {} }, { "sku": "SL182914-XL", "brand": "FAG", "manufacturer_designation": "SL182914-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 100, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 88, "static_load_kN": 111, "fatigue_load_limit_kN": 19.2, "limiting_speed_rpm": 3950, "max_rpm": 3950, "reference_speed_rpm": 2550, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×100×19 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 88 kN and C0 111 kN; with a C/C0 ratio of 0.79 the 19 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 19.2 kN, the limiting speed 3,950 r/min and the thermal reference speed 2,550 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.26 kN per millimetre of the 70 mm bore and 4.63 kN per millimetre of the 19 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 490 g (0.26 g per mm² of the 100×19 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 70 mm bore this is a heavy-industrial bearing: 490 g of stiff ring and roller set, specified where rigidity matters more than speed The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion High radial rigidity at 88 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 70×100×19 mm envelope. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 100 mm outside diameter and 88 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 70 mm seat, and in compact slow-speed agitator drives the 490 g mass suits the compact, space-optimised housing. Designers also specify it for heavy industrial gearbox shafts, relying on the 19 mm width and the published 111 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL182914-XL?", "a": "The SL182914-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 100 mm outside diameter, 70 mm bore and 19 mm width, envelope 70×100×19 mm. Mass is 490 g." }, { "q": "What does the SL182914-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182914-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×100×19 mm and the catalogue ratings are C 88 kN, C0 111 kN, Cur 19.2 kN." }, { "q": "What is the load capacity of the SL182914-XL?", "a": "The basic dynamic load rating C is 88 kN and the basic static load rating C0 is 111 kN; the fatigue load limit Cur is 19.2 kN." }, { "q": "What is the maximum speed of the SL182914-XL?", "a": "The limiting speed is 3,950 r/min and the thermal reference speed is 2,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182914-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182914", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182914-XL", "SL182914-XL" ], "locale_variants": {} }, { "sku": "SL183014-XL", "brand": "FAG", "manufacturer_designation": "SL183014-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 153, "static_load_kN": 174, "fatigue_load_limit_kN": 30, "limiting_speed_rpm": 3750, "max_rpm": 3750, "reference_speed_rpm": 2800, "weight_g": 1020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×110×30 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 153 kN and C0 174 kN; with a C/C0 ratio of 0.88 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 30 kN, the limiting speed 3,750 r/min and the thermal reference speed 2,800 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.19 kN per millimetre of the 70 mm bore and 5.10 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.02 kg (1020 g) (0.31 g per mm² of the 110×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 70 mm bore the 110 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,750 r/min The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion High radial rigidity at 153 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 30 kN Cur value. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 110 mm outside diameter and 153 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 70 mm seat, and in construction machinery slewing drives the 1.02 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 30 mm width and the published 174 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL183014-XL?", "a": "The SL183014-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 110 mm outside diameter, 70 mm bore and 30 mm width, envelope 70×110×30 mm. Mass is 1.02 kg." }, { "q": "What does the SL183014-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183014-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×110×30 mm and the catalogue ratings are C 153 kN, C0 174 kN, Cur 30 kN." }, { "q": "What is the load capacity of the SL183014-XL?", "a": "The basic dynamic load rating C is 153 kN and the basic static load rating C0 is 174 kN; the fatigue load limit Cur is 30 kN." }, { "q": "What is the maximum speed of the SL183014-XL?", "a": "The limiting speed is 3,750 r/min and the thermal reference speed is 2,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183014-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183014-XL", "SL183014-XL" ], "locale_variants": {} }, { "sku": "SL182214", "brand": "FAG", "manufacturer_designation": "SL182214", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 181, "static_load_kN": 223, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 3450, "max_rpm": 3450, "reference_speed_rpm": 2340, "weight_g": 1660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×125×31 mm with a 27.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 181 kN and C0 223 kN; with a C/C0 ratio of 0.81 the 31 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 34.5 kN, the limiting speed 3,450 r/min and the thermal reference speed 2,340 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.59 kN per millimetre of the 70 mm bore and 5.84 kN per millimetre of the 31 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.66 kg (1660 g) (0.43 g per mm² of the 125×31 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 70 mm bore the 125 mm outside diameter and 31 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,450 r/min The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion In the 125 mm envelope the cageless pack raises C0 to 223 kN; the trade is the 3,450 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 125 mm outside diameter and 181 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 70 mm seat, and in hydraulic pumps and radial piston pumps the 1.66 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 31 mm width and the published 223 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182214?", "a": "The SL182214 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 125 mm outside diameter, 70 mm bore and 31 mm width, envelope 70×125×31 mm. Mass is 1.66 kg." }, { "q": "What does the SL182214 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182214 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 70×125×31 mm and the catalogue ratings are C 181 kN, C0 223 kN, Cur 34.5 kN." }, { "q": "What is the load capacity of the SL182214?", "a": "The basic dynamic load rating C is 181 kN and the basic static load rating C0 is 223 kN; the fatigue load limit Cur is 34.5 kN." }, { "q": "What is the maximum speed of the SL182214?", "a": "The limiting speed is 3,450 r/min and the thermal reference speed is 2,340 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182214?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182214", "SL182214" ], "locale_variants": {} }, { "sku": "SL192314-XL", "brand": "FAG", "manufacturer_designation": "SL192314-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 385, "static_load_kN": 385, "fatigue_load_limit_kN": 73, "limiting_speed_rpm": 3050, "max_rpm": 3050, "reference_speed_rpm": 2170, "weight_g": 4330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×150×51 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 385 kN and C0 385 kN; with a C/C0 ratio of 1.00 the 51 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 73 kN, the limiting speed 3,050 r/min and the thermal reference speed 2,170 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.50 kN per millimetre of the 70 mm bore and 7.55 kN per millimetre of the 51 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 4.33 kg (4330 g) (0.57 g per mm² of the 150×51 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 70 mm bore the 150 mm outside diameter and 51 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,050 r/min The separable inner-ring/roller assembly and the single-flanged outer ring allow this bearing to be used as the floating or one-direction-locating position in a two-bearing shaft system The 51 mm width versus 150 mm outside diameter gives this series its characteristic squat proportions and high tipping rigidity under eccentric loads As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 73 kN Cur value. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 150 mm outside diameter and 385 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 70 mm seat, and in heavy industrial gearbox shafts the 4.33 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 51 mm width and the published 385 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL192314-XL?", "a": "The SL192314-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 150 mm outside diameter, 70 mm bore and 51 mm width, envelope 70×150×51 mm. Mass is 4.33 kg." }, { "q": "What does the SL192314-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192314-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×150×51 mm and the catalogue ratings are C 385 kN, C0 385 kN, Cur 73 kN." }, { "q": "What is the load capacity of the SL192314-XL?", "a": "The basic dynamic load rating C is 385 kN and the basic static load rating C0 is 385 kN; the fatigue load limit Cur is 73 kN." }, { "q": "What is the maximum speed of the SL192314-XL?", "a": "The limiting speed is 3,050 r/min and the thermal reference speed is 2,170 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192314-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192314-XL", "SL192314-XL" ], "locale_variants": {} }, { "sku": "SL182915-XL", "brand": "FAG", "manufacturer_designation": "SL182915-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 105, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 91, "static_load_kN": 119, "fatigue_load_limit_kN": 20.4, "limiting_speed_rpm": 3700, "max_rpm": 3700, "reference_speed_rpm": 2370, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×105×19 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 91 kN and C0 119 kN; with a C/C0 ratio of 0.76 the 19 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 20.4 kN, the limiting speed 3,700 r/min and the thermal reference speed 2,370 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.21 kN per millimetre of the 75 mm bore and 4.79 kN per millimetre of the 19 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 520 g (0.26 g per mm² of the 105×19 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 75 mm bore this is a heavy-industrial bearing: 520 g of stiff ring and roller set, specified where rigidity matters more than speed The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion SL182915-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,700 r/min limit. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 105 mm outside diameter and 91 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 75 mm seat, and in rolling-mill and steel-industry drives the 520 g mass suits the compact, space-optimised housing. Designers also specify it for construction machinery slewing drives, relying on the 19 mm width and the published 119 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182915-XL?", "a": "The SL182915-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 105 mm outside diameter, 75 mm bore and 19 mm width, envelope 75×105×19 mm. Mass is 520 g." }, { "q": "What does the SL182915-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182915-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×105×19 mm and the catalogue ratings are C 91 kN, C0 119 kN, Cur 20.4 kN." }, { "q": "What is the load capacity of the SL182915-XL?", "a": "The basic dynamic load rating C is 91 kN and the basic static load rating C0 is 119 kN; the fatigue load limit Cur is 20.4 kN." }, { "q": "What is the maximum speed of the SL182915-XL?", "a": "The limiting speed is 3,700 r/min and the thermal reference speed is 2,370 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182915-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182915", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182915-XL", "SL182915-XL" ], "locale_variants": {} }, { "sku": "SL183015-XL", "brand": "FAG", "manufacturer_designation": "SL183015-XL", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 162, "static_load_kN": 192, "fatigue_load_limit_kN": 33, "limiting_speed_rpm": 3450, "max_rpm": 3450, "reference_speed_rpm": 2490, "weight_g": 1060, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×115×30 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 162 kN and C0 192 kN; with a C/C0 ratio of 0.84 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 33 kN, the limiting speed 3,450 r/min and the thermal reference speed 2,490 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.16 kN per millimetre of the 75 mm bore and 5.40 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.06 kg (1060 g) (0.31 g per mm² of the 115×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 75 mm bore the 115 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,450 r/min The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 33 kN Cur value. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 115 mm outside diameter and 162 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 75 mm seat, and in crane travelling-wheel mechanisms the 1.06 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 30 mm width and the published 192 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL183015-XL?", "a": "The SL183015-XL is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 115 mm outside diameter, 75 mm bore and 30 mm width, envelope 75×115×30 mm. Mass is 1.06 kg." }, { "q": "What does the SL183015-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL183015-XL identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×115×30 mm and the catalogue ratings are C 162 kN, C0 192 kN, Cur 33 kN." }, { "q": "What is the load capacity of the SL183015-XL?", "a": "The basic dynamic load rating C is 162 kN and the basic static load rating C0 is 192 kN; the fatigue load limit Cur is 33 kN." }, { "q": "What is the maximum speed of the SL183015-XL?", "a": "The limiting speed is 3,450 r/min and the thermal reference speed is 2,490 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183015-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183015-XL", "SL183015-XL" ], "locale_variants": {} }, { "sku": "SL182215", "brand": "FAG", "manufacturer_designation": "SL182215", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 187, "static_load_kN": 236, "fatigue_load_limit_kN": 36.5, "limiting_speed_rpm": 3250, "max_rpm": 3250, "reference_speed_rpm": 2210, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×130×31 mm with a 27.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 187 kN and C0 236 kN; with a C/C0 ratio of 0.79 the 31 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 36.5 kN, the limiting speed 3,250 r/min and the thermal reference speed 2,210 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.49 kN per millimetre of the 75 mm bore and 6.03 kN per millimetre of the 31 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.75 kg (1750 g) (0.43 g per mm² of the 130×31 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 75 mm bore this is a heavy-industrial bearing: 1.75 kg of stiff ring and roller set, specified where rigidity matters more than speed SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 130 mm outside diameter and 187 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 75 mm seat, and in marine and offshore winch arrangements the 1.75 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 31 mm width and the published 236 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182215?", "a": "The SL182215 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 130 mm outside diameter, 75 mm bore and 31 mm width, envelope 75×130×31 mm. Mass is 1.75 kg." }, { "q": "What does the SL182215 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182215 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 75×130×31 mm and the catalogue ratings are C 187 kN, C0 236 kN, Cur 36.5 kN." }, { "q": "What is the load capacity of the SL182215?", "a": "The basic dynamic load rating C is 187 kN and the basic static load rating C0 is 236 kN; the fatigue load limit Cur is 36.5 kN." }, { "q": "What is the maximum speed of the SL182215?", "a": "The limiting speed is 3,250 r/min and the thermal reference speed is 2,210 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182215?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182215", "SL182215" ], "locale_variants": {} }, { "sku": "SL192315-XL", "brand": "FAG", "manufacturer_designation": "SL192315-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 460, "static_load_kN": 465, "fatigue_load_limit_kN": 88, "limiting_speed_rpm": 2800, "max_rpm": 2800, "reference_speed_rpm": 2000, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×160×55 mm with a 42.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 460 kN and C0 465 kN; with a C/C0 ratio of 0.99 the 55 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 88 kN, the limiting speed 2,800 r/min and the thermal reference speed 2,000 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.13 kN per millimetre of the 75 mm bore and 8.36 kN per millimetre of the 55 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 5.3 kg (5300 g) (0.60 g per mm² of the 160×55 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 75 mm bore the 160 mm outside diameter and 55 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,800 r/min SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 465 kN at 75 mm bore — for slow heavy positions As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 88 kN Cur value. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 160 mm outside diameter and 460 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 75 mm seat, and in marine and offshore winch arrangements the 5.3 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 55 mm width and the published 465 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL192315-XL?", "a": "The SL192315-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 160 mm outside diameter, 75 mm bore and 55 mm width, envelope 75×160×55 mm. Mass is 5.3 kg." }, { "q": "What does the SL192315-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192315-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×160×55 mm and the catalogue ratings are C 460 kN, C0 465 kN, Cur 88 kN." }, { "q": "What is the load capacity of the SL192315-XL?", "a": "The basic dynamic load rating C is 460 kN and the basic static load rating C0 is 465 kN; the fatigue load limit Cur is 88 kN." }, { "q": "What is the maximum speed of the SL192315-XL?", "a": "The limiting speed is 2,800 r/min and the thermal reference speed is 2,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192315-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192315-XL", "SL192315-XL" ], "locale_variants": {} }, { "sku": "SL182916-XL", "brand": "FAG", "manufacturer_designation": "SL182916-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 110, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 94, "static_load_kN": 126, "fatigue_load_limit_kN": 21.7, "limiting_speed_rpm": 3500, "max_rpm": 3500, "reference_speed_rpm": 2220, "weight_g": 550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×19 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 94 kN and C0 126 kN; with a C/C0 ratio of 0.75 the 19 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 21.7 kN, the limiting speed 3,500 r/min and the thermal reference speed 2,220 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.18 kN per millimetre of the 80 mm bore and 4.95 kN per millimetre of the 19 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 550 g (0.26 g per mm² of the 110×19 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 80 mm bore this is a heavy-industrial bearing: 550 g of stiff ring and roller set, specified where rigidity matters more than speed The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,500 r/min limit. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 110 mm outside diameter and 94 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 80 mm seat, and in planetary gear bearing positions the 550 g mass suits the compact, space-optimised housing. Designers also specify it for crane travelling-wheel mechanisms, relying on the 19 mm width and the published 126 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182916-XL?", "a": "The SL182916-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 110 mm outside diameter, 80 mm bore and 19 mm width, envelope 80×110×19 mm. Mass is 550 g." }, { "q": "What does the SL182916-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182916-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×110×19 mm and the catalogue ratings are C 94 kN, C0 126 kN, Cur 21.7 kN." }, { "q": "What is the load capacity of the SL182916-XL?", "a": "The basic dynamic load rating C is 94 kN and the basic static load rating C0 is 126 kN; the fatigue load limit Cur is 21.7 kN." }, { "q": "What is the maximum speed of the SL182916-XL?", "a": "The limiting speed is 3,500 r/min and the thermal reference speed is 2,220 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182916-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182916", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182916-XL", "SL182916-XL" ], "locale_variants": {} }, { "sku": "SL183016", "brand": "FAG", "manufacturer_designation": "SL183016", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 170, "static_load_kN": 220, "fatigue_load_limit_kN": 33.5, "limiting_speed_rpm": 3200, "max_rpm": 3200, "reference_speed_rpm": 2470, "weight_g": 1430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×125×34 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 170 kN and C0 220 kN; with a C/C0 ratio of 0.77 the 34 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 33.5 kN, the limiting speed 3,200 r/min and the thermal reference speed 2,470 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.13 kN per millimetre of the 80 mm bore and 5.00 kN per millimetre of the 34 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.43 kg (1430 g) (0.34 g per mm² of the 125×34 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 80 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly In the 125 mm envelope the cageless pack raises C0 to 220 kN; the trade is the 3,200 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 125 mm outside diameter and 170 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 80 mm seat, and in hydraulic pumps and radial piston pumps the 1.43 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 34 mm width and the published 220 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL183016?", "a": "The SL183016 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 125 mm outside diameter, 80 mm bore and 34 mm width, envelope 80×125×34 mm. Mass is 1.43 kg." }, { "q": "What does the SL183016 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183016 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 80×125×34 mm and the catalogue ratings are C 170 kN, C0 220 kN, Cur 33.5 kN." }, { "q": "What is the load capacity of the SL183016?", "a": "The basic dynamic load rating C is 170 kN and the basic static load rating C0 is 220 kN; the fatigue load limit Cur is 33.5 kN." }, { "q": "What is the maximum speed of the SL183016?", "a": "The limiting speed is 3,200 r/min and the thermal reference speed is 2,470 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183016?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183016", "SL183016" ], "locale_variants": {} }, { "sku": "SL182216", "brand": "FAG", "manufacturer_designation": "SL182216", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 223, "static_load_kN": 280, "fatigue_load_limit_kN": 41.5, "limiting_speed_rpm": 3000, "max_rpm": 3000, "reference_speed_rpm": 2040, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×140×33 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 223 kN and C0 280 kN; with a C/C0 ratio of 0.80 the 33 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 41.5 kN, the limiting speed 3,000 r/min and the thermal reference speed 2,040 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.79 kN per millimetre of the 80 mm bore and 6.76 kN per millimetre of the 33 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.15 kg (2150 g) (0.47 g per mm² of the 140×33 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 80 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 30.0 mm section height between the 80 mm bore and the 140 mm outside diameter Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 140 mm outside diameter and 223 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 80 mm seat, and in rope drums and winch drums the 2.15 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 33 mm width and the published 280 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL182216?", "a": "The SL182216 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 140 mm outside diameter, 80 mm bore and 33 mm width, envelope 80×140×33 mm. Mass is 2.15 kg." }, { "q": "What does the SL182216 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182216 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 80×140×33 mm and the catalogue ratings are C 223 kN, C0 280 kN, Cur 41.5 kN." }, { "q": "What is the load capacity of the SL182216?", "a": "The basic dynamic load rating C is 223 kN and the basic static load rating C0 is 280 kN; the fatigue load limit Cur is 41.5 kN." }, { "q": "What is the maximum speed of the SL182216?", "a": "The limiting speed is 3,000 r/min and the thermal reference speed is 2,040 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182216?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182216", "SL182216" ], "locale_variants": {} }, { "sku": "SL192316-XL", "brand": "FAG", "manufacturer_designation": "SL192316-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 540, "static_load_kN": 560, "fatigue_load_limit_kN": 101, "limiting_speed_rpm": 2600, "max_rpm": 2600, "reference_speed_rpm": 1820, "weight_g": 6320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×170×58 mm with a 45.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 540 kN and C0 560 kN; with a C/C0 ratio of 0.96 the 58 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 101 kN, the limiting speed 2,600 r/min and the thermal reference speed 1,820 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.75 kN per millimetre of the 80 mm bore and 9.31 kN per millimetre of the 58 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.32 kg (6320 g) (0.64 g per mm² of the 170×58 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 80 mm bore the 170 mm outside diameter and 58 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,600 r/min SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 560 kN at 80 mm bore — for slow heavy positions Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 540 kN C rating and longer nominal life come without an envelope change. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 170 mm outside diameter and 540 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 80 mm seat, and in crane travelling-wheel mechanisms the 6.32 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 58 mm width and the published 560 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL192316-XL?", "a": "The SL192316-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 170 mm outside diameter, 80 mm bore and 58 mm width, envelope 80×170×58 mm. Mass is 6.32 kg." }, { "q": "What does the SL192316-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192316-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×170×58 mm and the catalogue ratings are C 540 kN, C0 560 kN, Cur 101 kN." }, { "q": "What is the load capacity of the SL192316-XL?", "a": "The basic dynamic load rating C is 540 kN and the basic static load rating C0 is 560 kN; the fatigue load limit Cur is 101 kN." }, { "q": "What is the maximum speed of the SL192316-XL?", "a": "The limiting speed is 2,600 r/min and the thermal reference speed is 1,820 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192316-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192316-XL", "SL192316-XL" ], "locale_variants": {} }, { "sku": "SL182917-XL", "brand": "FAG", "manufacturer_designation": "SL182917-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 120, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 118, "static_load_kN": 159, "fatigue_load_limit_kN": 26, "limiting_speed_rpm": 3300, "max_rpm": 3300, "reference_speed_rpm": 2200, "weight_g": 810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×120×22 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 118 kN and C0 159 kN; with a C/C0 ratio of 0.74 the 22 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 26 kN, the limiting speed 3,300 r/min and the thermal reference speed 2,200 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.39 kN per millimetre of the 85 mm bore and 5.36 kN per millimetre of the 22 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 810 g (0.31 g per mm² of the 120×22 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 85 mm bore this is a heavy-industrial bearing: 810 g of stiff ring and roller set, specified where rigidity matters more than speed In the 120 mm envelope the cageless pack raises C0 to 159 kN; the trade is the 3,300 r/min limiting speed, set by roller-to-roller sliding rather than by a cage The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 17.5 mm section height between the 85 mm bore and the 120 mm outside diameter The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,300 r/min limit. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 120 mm outside diameter and 118 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 85 mm seat, and in heavy industrial gearbox shafts the 810 g mass suits the compact, space-optimised housing. Designers also specify it for rope drums and winch drums, relying on the 22 mm width and the published 159 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182917-XL?", "a": "The SL182917-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 120 mm outside diameter, 85 mm bore and 22 mm width, envelope 85×120×22 mm. Mass is 810 g." }, { "q": "What does the SL182917-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182917-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×120×22 mm and the catalogue ratings are C 118 kN, C0 159 kN, Cur 26 kN." }, { "q": "What is the load capacity of the SL182917-XL?", "a": "The basic dynamic load rating C is 118 kN and the basic static load rating C0 is 159 kN; the fatigue load limit Cur is 26 kN." }, { "q": "What is the maximum speed of the SL182917-XL?", "a": "The limiting speed is 3,300 r/min and the thermal reference speed is 2,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182917-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182917", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182917-XL", "SL182917-XL" ], "locale_variants": {} }, { "sku": "SL183017", "brand": "FAG", "manufacturer_designation": "SL183017", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 175, "static_load_kN": 231, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 3050, "max_rpm": 3050, "reference_speed_rpm": 2360, "weight_g": 1510, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×130×34 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 175 kN and C0 231 kN; with a C/C0 ratio of 0.76 the 34 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 35 kN, the limiting speed 3,050 r/min and the thermal reference speed 2,360 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.06 kN per millimetre of the 85 mm bore and 5.15 kN per millimetre of the 34 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.51 kg (1510 g) (0.34 g per mm² of the 130×34 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 85 mm bore the 130 mm outside diameter and 34 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,050 r/min The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 130 mm outside diameter and 175 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 85 mm seat, and in marine and offshore winch arrangements the 1.51 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 34 mm width and the published 231 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL183017?", "a": "The SL183017 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 130 mm outside diameter, 85 mm bore and 34 mm width, envelope 85×130×34 mm. Mass is 1.51 kg." }, { "q": "What does the SL183017 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183017 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 85×130×34 mm and the catalogue ratings are C 175 kN, C0 231 kN, Cur 35 kN." }, { "q": "What is the load capacity of the SL183017?", "a": "The basic dynamic load rating C is 175 kN and the basic static load rating C0 is 231 kN; the fatigue load limit Cur is 35 kN." }, { "q": "What is the maximum speed of the SL183017?", "a": "The limiting speed is 3,050 r/min and the thermal reference speed is 2,360 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183017?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183017", "SL183017" ], "locale_variants": {} }, { "sku": "SL182217", "brand": "FAG", "manufacturer_designation": "SL182217", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 255, "static_load_kN": 320, "fatigue_load_limit_kN": 47.5, "limiting_speed_rpm": 2850, "max_rpm": 2850, "reference_speed_rpm": 2000, "weight_g": 2740, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×150×36 mm with a 32.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 255 kN and C0 320 kN; with a C/C0 ratio of 0.80 the 36 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 47.5 kN, the limiting speed 2,850 r/min and the thermal reference speed 2,000 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.00 kN per millimetre of the 85 mm bore and 7.08 kN per millimetre of the 36 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.74 kg (2740 g) (0.51 g per mm² of the 150×36 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 85 mm bore the 150 mm outside diameter and 36 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,850 r/min SL182217 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs In the 150 mm envelope the cageless pack raises C0 to 320 kN; the trade is the 2,850 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 150 mm outside diameter and 255 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 85 mm seat, and in vibrating and oscillating machinery the 2.74 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 36 mm width and the published 320 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL182217?", "a": "The SL182217 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 150 mm outside diameter, 85 mm bore and 36 mm width, envelope 85×150×36 mm. Mass is 2.74 kg." }, { "q": "What does the SL182217 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182217 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 85×150×36 mm and the catalogue ratings are C 255 kN, C0 320 kN, Cur 47.5 kN." }, { "q": "What is the load capacity of the SL182217?", "a": "The basic dynamic load rating C is 255 kN and the basic static load rating C0 is 320 kN; the fatigue load limit Cur is 47.5 kN." }, { "q": "What is the maximum speed of the SL182217?", "a": "The limiting speed is 2,850 r/min and the thermal reference speed is 2,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182217?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182217", "SL182217" ], "locale_variants": {} }, { "sku": "SL192317-XL", "brand": "FAG", "manufacturer_designation": "SL192317-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 570, "static_load_kN": 610, "fatigue_load_limit_kN": 108, "limiting_speed_rpm": 2410, "max_rpm": 2410, "reference_speed_rpm": 1710, "weight_g": 7340, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×180×60 mm with a 47.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 570 kN and C0 610 kN; with a C/C0 ratio of 0.93 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 108 kN, the limiting speed 2,410 r/min and the thermal reference speed 1,710 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.71 kN per millimetre of the 85 mm bore and 9.50 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 7.34 kg (7340 g) (0.68 g per mm² of the 180×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 85 mm bore the 180 mm outside diameter and 60 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,410 r/min Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity The separable inner-ring/roller assembly and the single-flanged outer ring allow this bearing to be used as the floating or one-direction-locating position in a two-bearing shaft system -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 570 kN C rating and longer nominal life come without an envelope change. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 180 mm outside diameter and 570 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 85 mm seat, and in rope drums and winch drums the 7.34 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 60 mm width and the published 610 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL192317-XL?", "a": "The SL192317-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 180 mm outside diameter, 85 mm bore and 60 mm width, envelope 85×180×60 mm. Mass is 7.34 kg." }, { "q": "What does the SL192317-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192317-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×180×60 mm and the catalogue ratings are C 570 kN, C0 610 kN, Cur 108 kN." }, { "q": "What is the load capacity of the SL192317-XL?", "a": "The basic dynamic load rating C is 570 kN and the basic static load rating C0 is 610 kN; the fatigue load limit Cur is 108 kN." }, { "q": "What is the maximum speed of the SL192317-XL?", "a": "The limiting speed is 2,410 r/min and the thermal reference speed is 1,710 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192317-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192317-XL", "SL192317-XL" ], "locale_variants": {} }, { "sku": "SL182918-XL", "brand": "FAG", "manufacturer_designation": "SL182918-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 122, "static_load_kN": 169, "fatigue_load_limit_kN": 27, "limiting_speed_rpm": 3100, "max_rpm": 3100, "reference_speed_rpm": 2050, "weight_g": 840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×125×22 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 122 kN and C0 169 kN; with a C/C0 ratio of 0.72 the 22 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 27 kN, the limiting speed 3,100 r/min and the thermal reference speed 2,050 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.36 kN per millimetre of the 90 mm bore and 5.55 kN per millimetre of the 22 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 840 g (0.31 g per mm² of the 125×22 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 90 mm bore the 125 mm outside diameter and 22 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,100 r/min High radial rigidity at 122 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion X-life status (-XL) indicates the current Schaeffler premium execution at 90 mm bore; the 169 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 125 mm outside diameter and 122 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 90 mm seat, and in material handling conveyor pulleys the 840 g mass suits the compact, space-optimised housing. Designers also specify it for planetary gear bearing positions, relying on the 22 mm width and the published 169 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182918-XL?", "a": "The SL182918-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 125 mm outside diameter, 90 mm bore and 22 mm width, envelope 90×125×22 mm. Mass is 840 g." }, { "q": "What does the SL182918-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182918-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×125×22 mm and the catalogue ratings are C 122 kN, C0 169 kN, Cur 27 kN." }, { "q": "What is the load capacity of the SL182918-XL?", "a": "The basic dynamic load rating C is 122 kN and the basic static load rating C0 is 169 kN; the fatigue load limit Cur is 27 kN." }, { "q": "What is the maximum speed of the SL182918-XL?", "a": "The limiting speed is 3,100 r/min and the thermal reference speed is 2,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182918-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182918", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182918-XL", "SL182918-XL" ], "locale_variants": {} }, { "sku": "SL183018", "brand": "FAG", "manufacturer_designation": "SL183018", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 205, "static_load_kN": 275, "fatigue_load_limit_kN": 41, "limiting_speed_rpm": 2850, "max_rpm": 2850, "reference_speed_rpm": 2240, "weight_g": 1970, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×140×37 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 205 kN and C0 275 kN; with a C/C0 ratio of 0.75 the 37 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 41 kN, the limiting speed 2,850 r/min and the thermal reference speed 2,240 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.28 kN per millimetre of the 90 mm bore and 5.54 kN per millimetre of the 37 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.97 kg (1970 g) (0.38 g per mm² of the 140×37 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 90 mm bore this is a heavy-industrial bearing: 1.97 kg of stiff ring and roller set, specified where rigidity matters more than speed The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 25.0 mm section height between the 90 mm bore and the 140 mm outside diameter In the 140 mm envelope the cageless pack raises C0 to 275 kN; the trade is the 2,850 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 140 mm outside diameter and 205 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 90 mm seat, and in rope drums and winch drums the 1.97 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 37 mm width and the published 275 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL183018?", "a": "The SL183018 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 140 mm outside diameter, 90 mm bore and 37 mm width, envelope 90×140×37 mm. Mass is 1.97 kg." }, { "q": "What does the SL183018 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183018 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 90×140×37 mm and the catalogue ratings are C 205 kN, C0 275 kN, Cur 41 kN." }, { "q": "What is the load capacity of the SL183018?", "a": "The basic dynamic load rating C is 205 kN and the basic static load rating C0 is 275 kN; the fatigue load limit Cur is 41 kN." }, { "q": "What is the maximum speed of the SL183018?", "a": "The limiting speed is 2,850 r/min and the thermal reference speed is 2,240 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183018?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183018", "SL183018" ], "locale_variants": {} }, { "sku": "SL182218", "brand": "FAG", "manufacturer_designation": "SL182218", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 285, "static_load_kN": 365, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 2700, "max_rpm": 2700, "reference_speed_rpm": 1990, "weight_g": 3480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×160×40 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 285 kN and C0 365 kN; with a C/C0 ratio of 0.78 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 54 kN, the limiting speed 2,700 r/min and the thermal reference speed 1,990 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.17 kN per millimetre of the 90 mm bore and 7.13 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.48 kg (3480 g) (0.54 g per mm² of the 160×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 90 mm bore this is a heavy-industrial bearing: 3.48 kg of stiff ring and roller set, specified where rigidity matters more than speed Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value SL182218 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 160 mm outside diameter and 285 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 90 mm seat, and in heavy industrial gearbox shafts the 3.48 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 40 mm width and the published 365 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182218?", "a": "The SL182218 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 160 mm outside diameter, 90 mm bore and 40 mm width, envelope 90×160×40 mm. Mass is 3.48 kg." }, { "q": "What does the SL182218 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182218 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 90×160×40 mm and the catalogue ratings are C 285 kN, C0 365 kN, Cur 54 kN." }, { "q": "What is the load capacity of the SL182218?", "a": "The basic dynamic load rating C is 285 kN and the basic static load rating C0 is 365 kN; the fatigue load limit Cur is 54 kN." }, { "q": "What is the maximum speed of the SL182218?", "a": "The limiting speed is 2,700 r/min and the thermal reference speed is 1,990 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182218?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182218", "SL182218" ], "locale_variants": {} }, { "sku": "SL192318-TB-XL", "brand": "FAG", "manufacturer_designation": "SL192318-TB-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 620, "static_load_kN": 650, "fatigue_load_limit_kN": 118, "limiting_speed_rpm": 2400, "max_rpm": 2400, "reference_speed_rpm": 1760, "weight_g": 8830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×190×64 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 620 kN and C0 650 kN; with a C/C0 ratio of 0.95 the 64 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 118 kN, the limiting speed 2,400 r/min and the thermal reference speed 1,760 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.89 kN per millimetre of the 90 mm bore and 9.69 kN per millimetre of the 64 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 8.83 kg (8830 g) (0.73 g per mm² of the 190×64 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 650 kN at 90 mm bore — for slow heavy positions -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 620 kN C rating and longer nominal life come without an envelope change. The -TB suffix denotes the increased axial-load design: profiled roller ends and optimised rib contact geometry lower edge stress and friction at the guide ribs. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 190 mm outside diameter and 620 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 90 mm seat, and in heavy industrial gearbox shafts the 8.83 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 64 mm width and the published 650 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL192318-TB-XL?", "a": "The SL192318-TB-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 190 mm outside diameter, 90 mm bore and 64 mm width, envelope 90×190×64 mm. Mass is 8.83 kg." }, { "q": "What does the SL192318-TB-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192318-TB-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×190×64 mm and the catalogue ratings are C 620 kN, C0 650 kN, Cur 118 kN." }, { "q": "What is the load capacity of the SL192318-TB-XL?", "a": "The basic dynamic load rating C is 620 kN and the basic static load rating C0 is 650 kN; the fatigue load limit Cur is 118 kN." }, { "q": "What is the maximum speed of the SL192318-TB-XL?", "a": "The limiting speed is 2,400 r/min and the thermal reference speed is 1,760 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192318-TB-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192318-TB-XL", "SL192318-TB-XL" ], "locale_variants": {} }, { "sku": "SL182919-XL", "brand": "FAG", "manufacturer_designation": "SL182919-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 132, "static_load_kN": 177, "fatigue_load_limit_kN": 28, "limiting_speed_rpm": 2950, "max_rpm": 2950, "reference_speed_rpm": 1940, "weight_g": 860, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×130×22 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 132 kN and C0 177 kN; with a C/C0 ratio of 0.75 the 22 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 28 kN, the limiting speed 2,950 r/min and the thermal reference speed 1,940 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.39 kN per millimetre of the 95 mm bore and 6.00 kN per millimetre of the 22 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 860 g (0.30 g per mm² of the 130×22 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 95 mm bore the 130 mm outside diameter and 22 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,950 r/min High radial rigidity at 132 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly X-life status (-XL) indicates the current Schaeffler premium execution at 95 mm bore; the 177 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 130 mm outside diameter and 132 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 95 mm seat, and in compact slow-speed agitator drives the 860 g mass suits the compact, space-optimised housing. Designers also specify it for heavy industrial gearbox shafts, relying on the 22 mm width and the published 177 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL182919-XL?", "a": "The SL182919-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 130 mm outside diameter, 95 mm bore and 22 mm width, envelope 95×130×22 mm. Mass is 860 g." }, { "q": "What does the SL182919-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182919-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×130×22 mm and the catalogue ratings are C 132 kN, C0 177 kN, Cur 28 kN." }, { "q": "What is the load capacity of the SL182919-XL?", "a": "The basic dynamic load rating C is 132 kN and the basic static load rating C0 is 177 kN; the fatigue load limit Cur is 28 kN." }, { "q": "What is the maximum speed of the SL182919-XL?", "a": "The limiting speed is 2,950 r/min and the thermal reference speed is 1,940 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182919-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182919", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182919-XL", "SL182919-XL" ], "locale_variants": {} }, { "sku": "SL182219", "brand": "FAG", "manufacturer_designation": "SL182219", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 330, "static_load_kN": 425, "fatigue_load_limit_kN": 62, "limiting_speed_rpm": 2420, "max_rpm": 2420, "reference_speed_rpm": 1780, "weight_g": 4170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×170×43 mm with a 37.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 330 kN and C0 425 kN; with a C/C0 ratio of 0.78 the 43 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 62 kN, the limiting speed 2,420 r/min and the thermal reference speed 1,780 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.47 kN per millimetre of the 95 mm bore and 7.67 kN per millimetre of the 43 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 4.17 kg (4170 g) (0.57 g per mm² of the 170×43 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 95 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery In the 170 mm envelope the cageless pack raises C0 to 425 kN; the trade is the 2,420 r/min limiting speed, set by roller-to-roller sliding rather than by a cage The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 37.5 mm section height between the 95 mm bore and the 170 mm outside diameter Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 170 mm outside diameter and 330 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 95 mm seat, and in crane travelling-wheel mechanisms the 4.17 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 43 mm width and the published 425 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182219?", "a": "The SL182219 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 170 mm outside diameter, 95 mm bore and 43 mm width, envelope 95×170×43 mm. Mass is 4.17 kg." }, { "q": "What does the SL182219 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182219 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 95×170×43 mm and the catalogue ratings are C 330 kN, C0 425 kN, Cur 62 kN." }, { "q": "What is the load capacity of the SL182219?", "a": "The basic dynamic load rating C is 330 kN and the basic static load rating C0 is 425 kN; the fatigue load limit Cur is 62 kN." }, { "q": "What is the maximum speed of the SL182219?", "a": "The limiting speed is 2,420 r/min and the thermal reference speed is 1,780 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182219?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182219", "SL182219" ], "locale_variants": {} }, { "sku": "SL192319-TB-XL", "brand": "FAG", "manufacturer_designation": "SL192319-TB-XL", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 650, "static_load_kN": 710, "fatigue_load_limit_kN": 126, "limiting_speed_rpm": 2240, "max_rpm": 2240, "reference_speed_rpm": 1620, "weight_g": 10200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×200×67 mm with a 52.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 650 kN and C0 710 kN; with a C/C0 ratio of 0.92 the 67 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 126 kN, the limiting speed 2,240 r/min and the thermal reference speed 1,620 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.84 kN per millimetre of the 95 mm bore and 9.70 kN per millimetre of the 67 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 10.2 kg (10200 g) (0.76 g per mm² of the 200×67 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 95 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity The separable inner-ring/roller assembly and the single-flanged outer ring allow this bearing to be used as the floating or one-direction-locating position in a two-bearing shaft system -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 650 kN C rating and longer nominal life come without an envelope change. -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 200 mm outside diameter and 650 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 95 mm seat, and in crane travelling-wheel mechanisms the 10.2 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 67 mm width and the published 710 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL192319-TB-XL?", "a": "The SL192319-TB-XL is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 200 mm outside diameter, 95 mm bore and 67 mm width, envelope 95×200×67 mm. Mass is 10.2 kg." }, { "q": "What does the SL192319-TB-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL192319-TB-XL identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×200×67 mm and the catalogue ratings are C 650 kN, C0 710 kN, Cur 126 kN." }, { "q": "What is the load capacity of the SL192319-TB-XL?", "a": "The basic dynamic load rating C is 650 kN and the basic static load rating C0 is 710 kN; the fatigue load limit Cur is 126 kN." }, { "q": "What is the maximum speed of the SL192319-TB-XL?", "a": "The limiting speed is 2,240 r/min and the thermal reference speed is 1,620 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192319-TB-XL?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192319-TB-XL", "SL192319-TB-XL" ], "locale_variants": {} }, { "sku": "SL182920-XL", "brand": "FAG", "manufacturer_designation": "SL182920-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 152, "static_load_kN": 203, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 2750, "max_rpm": 2750, "reference_speed_rpm": 1870, "weight_g": 1140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×140×24 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 152 kN and C0 203 kN; with a C/C0 ratio of 0.75 the 24 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 32.5 kN, the limiting speed 2,750 r/min and the thermal reference speed 1,870 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.52 kN per millimetre of the 100 mm bore and 6.33 kN per millimetre of the 24 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.14 kg (1140 g) (0.34 g per mm² of the 140×24 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 100 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly SL182920-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 100×140×24 mm envelope. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 140 mm outside diameter and 152 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 100 mm seat, and in crane travelling-wheel mechanisms the 1.14 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 24 mm width and the published 203 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182920-XL?", "a": "The SL182920-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 140 mm outside diameter, 100 mm bore and 24 mm width, envelope 100×140×24 mm. Mass is 1.14 kg." }, { "q": "What does the SL182920-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182920-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×140×24 mm and the catalogue ratings are C 152 kN, C0 203 kN, Cur 32.5 kN." }, { "q": "What is the load capacity of the SL182920-XL?", "a": "The basic dynamic load rating C is 152 kN and the basic static load rating C0 is 203 kN; the fatigue load limit Cur is 32.5 kN." }, { "q": "What is the maximum speed of the SL182920-XL?", "a": "The limiting speed is 2,750 r/min and the thermal reference speed is 1,870 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182920-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182920", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182920-XL", "SL182920-XL" ], "locale_variants": {} }, { "sku": "SL183020", "brand": "FAG", "manufacturer_designation": "SL183020", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 216, "static_load_kN": 300, "fatigue_load_limit_kN": 43.5, "limiting_speed_rpm": 2600, "max_rpm": 2600, "reference_speed_rpm": 2040, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×150×37 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 216 kN and C0 300 kN; with a C/C0 ratio of 0.72 the 37 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 43.5 kN, the limiting speed 2,600 r/min and the thermal reference speed 2,040 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.16 kN per millimetre of the 100 mm bore and 5.84 kN per millimetre of the 37 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.15 kg (2150 g) (0.39 g per mm² of the 150×37 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 100 mm bore the 150 mm outside diameter and 37 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,600 r/min SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly SL183020 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 150 mm outside diameter and 216 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 100 mm seat, and in hydraulic pumps and radial piston pumps the 2.15 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 37 mm width and the published 300 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL183020?", "a": "The SL183020 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 150 mm outside diameter, 100 mm bore and 37 mm width, envelope 100×150×37 mm. Mass is 2.15 kg." }, { "q": "What does the SL183020 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183020 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 100×150×37 mm and the catalogue ratings are C 216 kN, C0 300 kN, Cur 43.5 kN." }, { "q": "What is the load capacity of the SL183020?", "a": "The basic dynamic load rating C is 216 kN and the basic static load rating C0 is 300 kN; the fatigue load limit Cur is 43.5 kN." }, { "q": "What is the maximum speed of the SL183020?", "a": "The limiting speed is 2,600 r/min and the thermal reference speed is 2,040 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183020?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183020", "SL183020" ], "locale_variants": {} }, { "sku": "SL182220", "brand": "FAG", "manufacturer_designation": "SL182220", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 390, "static_load_kN": 510, "fatigue_load_limit_kN": 74, "limiting_speed_rpm": 2300, "max_rpm": 2300, "reference_speed_rpm": 1700, "weight_g": 5130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×180×46 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 390 kN and C0 510 kN; with a C/C0 ratio of 0.76 the 46 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 74 kN, the limiting speed 2,300 r/min and the thermal reference speed 1,700 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.90 kN per millimetre of the 100 mm bore and 8.48 kN per millimetre of the 46 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 5.13 kg (5130 g) (0.62 g per mm² of the 180×46 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 100 mm bore the 180 mm outside diameter and 46 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,300 r/min High radial rigidity at 390 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery In the 180 mm envelope the cageless pack raises C0 to 510 kN; the trade is the 2,300 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 180 mm outside diameter and 390 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 100 mm seat, and in rope drums and winch drums the 5.13 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 46 mm width and the published 510 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182220?", "a": "The SL182220 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 180 mm outside diameter, 100 mm bore and 46 mm width, envelope 100×180×46 mm. Mass is 5.13 kg." }, { "q": "What does the SL182220 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182220 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 100×180×46 mm and the catalogue ratings are C 390 kN, C0 510 kN, Cur 74 kN." }, { "q": "What is the load capacity of the SL182220?", "a": "The basic dynamic load rating C is 390 kN and the basic static load rating C0 is 510 kN; the fatigue load limit Cur is 74 kN." }, { "q": "What is the maximum speed of the SL182220?", "a": "The limiting speed is 2,300 r/min and the thermal reference speed is 1,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182220?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182220", "SL182220" ], "locale_variants": {} }, { "sku": "SL192320-TB-XL-BR", "brand": "FAG", "manufacturer_designation": "SL192320-TB-XL-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 790, "static_load_kN": 850, "fatigue_load_limit_kN": 150, "limiting_speed_rpm": 2110, "max_rpm": 2110, "reference_speed_rpm": 1490, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×215×73 mm with a 57.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 790 kN and C0 850 kN; with a C/C0 ratio of 0.93 the 73 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 150 kN, the limiting speed 2,110 r/min and the thermal reference speed 1,490 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.90 kN per millimetre of the 100 mm bore and 10.82 kN per millimetre of the 73 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 13 kg (13000 g) (0.83 g per mm² of the 215×73 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 100 mm bore the 215 mm outside diameter and 73 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,110 r/min Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity At 2,110 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 790 kN dynamic rating As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 150 kN Cur value. Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 790 kN C. BR-finished surfaces tolerate damp assembly environments better than bare steel, which matters for the large 13 kg industrial executions. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 215 mm outside diameter and 790 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 100 mm seat, and in heavy industrial gearbox shafts the 13 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 73 mm width and the published 850 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192320-TB-XL-BR?", "a": "The SL192320-TB-XL-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 215 mm outside diameter, 100 mm bore and 73 mm width, envelope 100×215×73 mm. Mass is 13 kg." }, { "q": "What does the SL192320-TB-XL-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192320-TB-XL-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×215×73 mm and the catalogue ratings are C 790 kN, C0 850 kN, Cur 150 kN." }, { "q": "What is the load capacity of the SL192320-TB-XL-BR?", "a": "The basic dynamic load rating C is 790 kN and the basic static load rating C0 is 850 kN; the fatigue load limit Cur is 150 kN." }, { "q": "What is the maximum speed of the SL192320-TB-XL-BR?", "a": "The limiting speed is 2,110 r/min and the thermal reference speed is 1,490 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192320-TB-XL-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192320", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192320-TB-XL-BR", "SL192320-TB-XL-BR" ], "locale_variants": {} }, { "sku": "SL182922-XL", "brand": "FAG", "manufacturer_designation": "SL182922-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 155, "static_load_kN": 213, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 2500, "max_rpm": 2500, "reference_speed_rpm": 1710, "weight_g": 1230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×150×24 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 155 kN and C0 213 kN; with a C/C0 ratio of 0.73 the 24 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 34.5 kN, the limiting speed 2,500 r/min and the thermal reference speed 1,710 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.41 kN per millimetre of the 110 mm bore and 6.46 kN per millimetre of the 24 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.23 kg (1230 g) (0.34 g per mm² of the 150×24 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 110 mm bore this is a heavy-industrial bearing: 1.23 kg of stiff ring and roller set, specified where rigidity matters more than speed SL182922-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 110×150×24 mm envelope. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 150 mm outside diameter and 155 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 110 mm seat, and in hydraulic pumps and radial piston pumps the 1.23 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 24 mm width and the published 213 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182922-XL?", "a": "The SL182922-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 150 mm outside diameter, 110 mm bore and 24 mm width, envelope 110×150×24 mm. Mass is 1.23 kg." }, { "q": "What does the SL182922-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182922-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×150×24 mm and the catalogue ratings are C 155 kN, C0 213 kN, Cur 34.5 kN." }, { "q": "What is the load capacity of the SL182922-XL?", "a": "The basic dynamic load rating C is 155 kN and the basic static load rating C0 is 213 kN; the fatigue load limit Cur is 34.5 kN." }, { "q": "What is the maximum speed of the SL182922-XL?", "a": "The limiting speed is 2,500 r/min and the thermal reference speed is 1,710 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182922-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182922", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182922-XL", "SL182922-XL" ], "locale_variants": {} }, { "sku": "SL183022", "brand": "FAG", "manufacturer_designation": "SL183022", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 280, "static_load_kN": 385, "fatigue_load_limit_kN": 55, "limiting_speed_rpm": 2350, "max_rpm": 2350, "reference_speed_rpm": 2010, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×170×45 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 280 kN and C0 385 kN; with a C/C0 ratio of 0.73 the 45 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 55 kN, the limiting speed 2,350 r/min and the thermal reference speed 2,010 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.55 kN per millimetre of the 110 mm bore and 6.22 kN per millimetre of the 45 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.5 kg (3500 g) (0.46 g per mm² of the 170×45 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 110 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery SL183022 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 170 mm outside diameter and 280 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 110 mm seat, and in rope drums and winch drums the 3.5 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 45 mm width and the published 385 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL183022?", "a": "The SL183022 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 170 mm outside diameter, 110 mm bore and 45 mm width, envelope 110×170×45 mm. Mass is 3.5 kg." }, { "q": "What does the SL183022 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183022 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 110×170×45 mm and the catalogue ratings are C 280 kN, C0 385 kN, Cur 55 kN." }, { "q": "What is the load capacity of the SL183022?", "a": "The basic dynamic load rating C is 280 kN and the basic static load rating C0 is 385 kN; the fatigue load limit Cur is 55 kN." }, { "q": "What is the maximum speed of the SL183022?", "a": "The limiting speed is 2,350 r/min and the thermal reference speed is 2,010 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183022?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183022", "SL183022" ], "locale_variants": {} }, { "sku": "SL182222", "brand": "FAG", "manufacturer_designation": "SL182222", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 450, "static_load_kN": 580, "fatigue_load_limit_kN": 83, "limiting_speed_rpm": 2130, "max_rpm": 2130, "reference_speed_rpm": 1720, "weight_g": 7240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×200×53 mm with a 45.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 450 kN and C0 580 kN; with a C/C0 ratio of 0.78 the 53 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 83 kN, the limiting speed 2,130 r/min and the thermal reference speed 1,720 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.09 kN per millimetre of the 110 mm bore and 8.49 kN per millimetre of the 53 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 7.24 kg (7240 g) (0.68 g per mm² of the 200×53 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 110 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 45.0 mm section height between the 110 mm bore and the 200 mm outside diameter Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 200 mm outside diameter and 450 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 110 mm seat, and in heavy industrial gearbox shafts the 7.24 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 53 mm width and the published 580 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182222?", "a": "The SL182222 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 200 mm outside diameter, 110 mm bore and 53 mm width, envelope 110×200×53 mm. Mass is 7.24 kg." }, { "q": "What does the SL182222 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182222 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 110×200×53 mm and the catalogue ratings are C 450 kN, C0 580 kN, Cur 83 kN." }, { "q": "What is the load capacity of the SL182222?", "a": "The basic dynamic load rating C is 450 kN and the basic static load rating C0 is 580 kN; the fatigue load limit Cur is 83 kN." }, { "q": "What is the maximum speed of the SL182222?", "a": "The limiting speed is 2,130 r/min and the thermal reference speed is 1,720 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182222?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182222", "SL182222" ], "locale_variants": {} }, { "sku": "SL192322-TB-XL-BR", "brand": "FAG", "manufacturer_designation": "SL192322-TB-XL-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 950, "static_load_kN": 970, "fatigue_load_limit_kN": 163, "limiting_speed_rpm": 1820, "max_rpm": 1820, "reference_speed_rpm": 1270, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×240×80 mm with a 65.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 950 kN and C0 970 kN; with a C/C0 ratio of 0.98 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 163 kN, the limiting speed 1,820 r/min and the thermal reference speed 1,270 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 8.64 kN per millimetre of the 110 mm bore and 11.88 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 17 kg (17000 g) (0.89 g per mm² of the 240×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 110 mm bore the 240 mm outside diameter and 80 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 1,820 r/min SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 970 kN at 110 mm bore — for slow heavy positions Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 110×240×80 mm envelope. TB-design bearings use revised roller-end curvature to protect the ribs under combined load — relevant at 110 mm bore where the semi-locating function carries real thrust. -BR marks the oxide-treated execution: the thin black conversion coating protects the 950 kN-rated bearing before it enters lubricated service. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 240 mm outside diameter and 950 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 110 mm seat, and in compact slow-speed agitator drives the 17 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 80 mm width and the published 970 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL192322-TB-XL-BR?", "a": "The SL192322-TB-XL-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 240 mm outside diameter, 110 mm bore and 80 mm width, envelope 110×240×80 mm. Mass is 17 kg." }, { "q": "What does the SL192322-TB-XL-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192322-TB-XL-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×240×80 mm and the catalogue ratings are C 950 kN, C0 970 kN, Cur 163 kN." }, { "q": "What is the load capacity of the SL192322-TB-XL-BR?", "a": "The basic dynamic load rating C is 950 kN and the basic static load rating C0 is 970 kN; the fatigue load limit Cur is 163 kN." }, { "q": "What is the maximum speed of the SL192322-TB-XL-BR?", "a": "The limiting speed is 1,820 r/min and the thermal reference speed is 1,270 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192322-TB-XL-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=521", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192322-TB-XL-BR", "SL192322-TB-XL-BR" ], "locale_variants": {} }, { "sku": "SL182924-XL", "brand": "FAG", "manufacturer_designation": "SL182924-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 199, "static_load_kN": 285, "fatigue_load_limit_kN": 46.5, "limiting_speed_rpm": 2290, "max_rpm": 2290, "reference_speed_rpm": 1590, "weight_g": 1730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×165×27 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 199 kN and C0 285 kN; with a C/C0 ratio of 0.70 the 27 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 46.5 kN, the limiting speed 2,290 r/min and the thermal reference speed 1,590 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.66 kN per millimetre of the 120 mm bore and 7.37 kN per millimetre of the 27 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.73 kg (1730 g) (0.39 g per mm² of the 165×27 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 120 mm bore this is a heavy-industrial bearing: 1.73 kg of stiff ring and roller set, specified where rigidity matters more than speed In the 165 mm envelope the cageless pack raises C0 to 285 kN; the trade is the 2,290 r/min limiting speed, set by roller-to-roller sliding rather than by a cage High radial rigidity at 199 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 2,290 r/min limit. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 165 mm outside diameter and 199 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 120 mm seat, and in marine and offshore winch arrangements the 1.73 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 27 mm width and the published 285 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL182924-XL?", "a": "The SL182924-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 165 mm outside diameter, 120 mm bore and 27 mm width, envelope 120×165×27 mm. Mass is 1.73 kg." }, { "q": "What does the SL182924-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182924-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 120×165×27 mm and the catalogue ratings are C 199 kN, C0 285 kN, Cur 46.5 kN." }, { "q": "What is the load capacity of the SL182924-XL?", "a": "The basic dynamic load rating C is 199 kN and the basic static load rating C0 is 285 kN; the fatigue load limit Cur is 46.5 kN." }, { "q": "What is the maximum speed of the SL182924-XL?", "a": "The limiting speed is 2,290 r/min and the thermal reference speed is 1,590 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182924-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182924", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182924-XL", "SL182924-XL" ], "locale_variants": {} }, { "sku": "SL183024", "brand": "FAG", "manufacturer_designation": "SL183024", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 295, "static_load_kN": 425, "fatigue_load_limit_kN": 59, "limiting_speed_rpm": 2160, "max_rpm": 2160, "reference_speed_rpm": 1840, "weight_g": 3800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×180×46 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 295 kN and C0 425 kN; with a C/C0 ratio of 0.69 the 46 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 59 kN, the limiting speed 2,160 r/min and the thermal reference speed 1,840 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.46 kN per millimetre of the 120 mm bore and 6.41 kN per millimetre of the 46 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.8 kg (3800 g) (0.46 g per mm² of the 180×46 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 120 mm bore this is a heavy-industrial bearing: 3.8 kg of stiff ring and roller set, specified where rigidity matters more than speed The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 30.0 mm section height between the 120 mm bore and the 180 mm outside diameter High radial rigidity at 295 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 180 mm outside diameter and 295 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 120 mm seat, and in heavy industrial gearbox shafts the 3.8 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 46 mm width and the published 425 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL183024?", "a": "The SL183024 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 180 mm outside diameter, 120 mm bore and 46 mm width, envelope 120×180×46 mm. Mass is 3.8 kg." }, { "q": "What does the SL183024 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183024 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 120×180×46 mm and the catalogue ratings are C 295 kN, C0 425 kN, Cur 59 kN." }, { "q": "What is the load capacity of the SL183024?", "a": "The basic dynamic load rating C is 295 kN and the basic static load rating C0 is 425 kN; the fatigue load limit Cur is 59 kN." }, { "q": "What is the maximum speed of the SL183024?", "a": "The limiting speed is 2,160 r/min and the thermal reference speed is 1,840 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183024?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183024", "SL183024" ], "locale_variants": {} }, { "sku": "SL182224", "brand": "FAG", "manufacturer_designation": "SL182224", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 530, "static_load_kN": 720, "fatigue_load_limit_kN": 100, "limiting_speed_rpm": 1930, "max_rpm": 1930, "reference_speed_rpm": 1500, "weight_g": 9080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×215×58 mm with a 47.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 530 kN and C0 720 kN; with a C/C0 ratio of 0.74 the 58 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 100 kN, the limiting speed 1,930 r/min and the thermal reference speed 1,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.42 kN per millimetre of the 120 mm bore and 9.14 kN per millimetre of the 58 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 9.08 kg (9080 g) (0.73 g per mm² of the 215×58 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 120 mm bore this is a heavy-industrial bearing: 9.08 kg of stiff ring and roller set, specified where rigidity matters more than speed The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 47.5 mm section height between the 120 mm bore and the 215 mm outside diameter SL182224 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 215 mm outside diameter and 530 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 120 mm seat, and in compact slow-speed agitator drives the 9.08 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 58 mm width and the published 720 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182224?", "a": "The SL182224 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 215 mm outside diameter, 120 mm bore and 58 mm width, envelope 120×215×58 mm. Mass is 9.08 kg." }, { "q": "What does the SL182224 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182224 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 120×215×58 mm and the catalogue ratings are C 530 kN, C0 720 kN, Cur 100 kN." }, { "q": "What is the load capacity of the SL182224?", "a": "The basic dynamic load rating C is 530 kN and the basic static load rating C0 is 720 kN; the fatigue load limit Cur is 100 kN." }, { "q": "What is the maximum speed of the SL182224?", "a": "The limiting speed is 1,930 r/min and the thermal reference speed is 1,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182224?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182224", "SL182224" ], "locale_variants": {} }, { "sku": "SL192324-TB-XL-BR", "brand": "FAG", "manufacturer_designation": "SL192324-TB-XL-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1130, "static_load_kN": 1230, "fatigue_load_limit_kN": 204, "limiting_speed_rpm": 1690, "max_rpm": 1690, "reference_speed_rpm": 1120, "weight_g": 22300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×260×86 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1130 kN and C0 1230 kN; with a C/C0 ratio of 0.92 the 86 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 204 kN, the limiting speed 1,690 r/min and the thermal reference speed 1,120 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 9.42 kN per millimetre of the 120 mm bore and 13.14 kN per millimetre of the 86 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 22.3 kg (22300 g) (1.00 g per mm² of the 260×86 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 120 mm bore the 260 mm outside diameter and 86 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 1,690 r/min Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity X-life status (-XL) indicates the current Schaeffler premium execution at 120 mm bore; the 1230 kN C0 rating reflects the improved rolling-contact geometry. Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1130 kN C. The -BR coating is a handling and storage protection; once mounted and greased, the 260 mm bearing operates to its normal 1,690 r/min limit. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 260 mm outside diameter and 1130 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 120 mm seat, and in construction machinery slewing drives the 22.3 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 86 mm width and the published 1230 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL192324-TB-XL-BR?", "a": "The SL192324-TB-XL-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 260 mm outside diameter, 120 mm bore and 86 mm width, envelope 120×260×86 mm. Mass is 22.3 kg." }, { "q": "What does the SL192324-TB-XL-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192324-TB-XL-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 120×260×86 mm and the catalogue ratings are C 1130 kN, C0 1230 kN, Cur 204 kN." }, { "q": "What is the load capacity of the SL192324-TB-XL-BR?", "a": "The basic dynamic load rating C is 1130 kN and the basic static load rating C0 is 1230 kN; the fatigue load limit Cur is 204 kN." }, { "q": "What is the maximum speed of the SL192324-TB-XL-BR?", "a": "The limiting speed is 1,690 r/min and the thermal reference speed is 1,120 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192324-TB-XL-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192324-TB-XL-BR", "SL192324-TB-XL-BR" ], "locale_variants": {} }, { "sku": "SL182926-XL", "brand": "FAG", "manufacturer_designation": "SL182926-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 238, "static_load_kN": 350, "fatigue_load_limit_kN": 55, "limiting_speed_rpm": 2110, "max_rpm": 2110, "reference_speed_rpm": 1500, "weight_g": 2330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×180×30 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 238 kN and C0 350 kN; with a C/C0 ratio of 0.68 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 55 kN, the limiting speed 2,110 r/min and the thermal reference speed 1,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.83 kN per millimetre of the 130 mm bore and 7.93 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.33 kg (2330 g) (0.43 g per mm² of the 180×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 130 mm bore, 180 mm outside diameter: at this size the 350 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL182926-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs High radial rigidity at 238 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery X-life status (-XL) indicates the current Schaeffler premium execution at 130 mm bore; the 350 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 180 mm outside diameter and 238 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 130 mm seat, and in rope drums and winch drums the 2.33 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 30 mm width and the published 350 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL182926-XL?", "a": "The SL182926-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 180 mm outside diameter, 130 mm bore and 30 mm width, envelope 130×180×30 mm. Mass is 2.33 kg." }, { "q": "What does the SL182926-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182926-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 130×180×30 mm and the catalogue ratings are C 238 kN, C0 350 kN, Cur 55 kN." }, { "q": "What is the load capacity of the SL182926-XL?", "a": "The basic dynamic load rating C is 238 kN and the basic static load rating C0 is 350 kN; the fatigue load limit Cur is 55 kN." }, { "q": "What is the maximum speed of the SL182926-XL?", "a": "The limiting speed is 2,110 r/min and the thermal reference speed is 1,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182926-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182926", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182926-XL", "SL182926-XL" ], "locale_variants": {} }, { "sku": "SL183026", "brand": "FAG", "manufacturer_designation": "SL183026", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 425, "static_load_kN": 600, "fatigue_load_limit_kN": 84, "limiting_speed_rpm": 1990, "max_rpm": 1990, "reference_speed_rpm": 1660, "weight_g": 5650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×200×52 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 425 kN and C0 600 kN; with a C/C0 ratio of 0.71 the 52 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 84 kN, the limiting speed 1,990 r/min and the thermal reference speed 1,660 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.27 kN per millimetre of the 130 mm bore and 8.17 kN per millimetre of the 52 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 5.65 kg (5650 g) (0.54 g per mm² of the 200×52 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 130 mm bore this is among the largest catalogue sizes; the 1,990 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 200 mm outside diameter and 425 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 130 mm seat, and in compact slow-speed agitator drives the 5.65 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 52 mm width and the published 600 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL183026?", "a": "The SL183026 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 200 mm outside diameter, 130 mm bore and 52 mm width, envelope 130×200×52 mm. Mass is 5.65 kg." }, { "q": "What does the SL183026 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183026 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 130×200×52 mm and the catalogue ratings are C 425 kN, C0 600 kN, Cur 84 kN." }, { "q": "What is the load capacity of the SL183026?", "a": "The basic dynamic load rating C is 425 kN and the basic static load rating C0 is 600 kN; the fatigue load limit Cur is 84 kN." }, { "q": "What is the maximum speed of the SL183026?", "a": "The limiting speed is 1,990 r/min and the thermal reference speed is 1,660 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183026?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183026", "SL183026" ], "locale_variants": {} }, { "sku": "SL182226", "brand": "FAG", "manufacturer_designation": "SL182226", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 620, "static_load_kN": 850, "fatigue_load_limit_kN": 115, "limiting_speed_rpm": 1790, "max_rpm": 1790, "reference_speed_rpm": 1360, "weight_g": 11250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×230×64 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 620 kN and C0 850 kN; with a C/C0 ratio of 0.73 the 64 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 115 kN, the limiting speed 1,790 r/min and the thermal reference speed 1,360 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.77 kN per millimetre of the 130 mm bore and 9.69 kN per millimetre of the 64 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 11.25 kg (11250 g) (0.76 g per mm² of the 230×64 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 130 mm bore this is among the largest catalogue sizes; the 1,790 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 230 mm outside diameter and 620 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 130 mm seat, and in construction machinery slewing drives the 11.25 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 64 mm width and the published 850 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182226?", "a": "The SL182226 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 230 mm outside diameter, 130 mm bore and 64 mm width, envelope 130×230×64 mm. Mass is 11.25 kg." }, { "q": "What does the SL182226 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182226 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 130×230×64 mm and the catalogue ratings are C 620 kN, C0 850 kN, Cur 115 kN." }, { "q": "What is the load capacity of the SL182226?", "a": "The basic dynamic load rating C is 620 kN and the basic static load rating C0 is 850 kN; the fatigue load limit Cur is 115 kN." }, { "q": "What is the maximum speed of the SL182226?", "a": "The limiting speed is 1,790 r/min and the thermal reference speed is 1,360 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182226?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182226", "SL182226" ], "locale_variants": {} }, { "sku": "SL192326-TB-XL-BR", "brand": "FAG", "manufacturer_designation": "SL192326-TB-XL-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1260, "static_load_kN": 1380, "fatigue_load_limit_kN": 225, "limiting_speed_rpm": 1570, "max_rpm": 1570, "reference_speed_rpm": 1040, "weight_g": 27950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×280×93 mm with a 75.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1260 kN and C0 1380 kN; with a C/C0 ratio of 0.91 the 93 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 225 kN, the limiting speed 1,570 r/min and the thermal reference speed 1,040 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 9.69 kN per millimetre of the 130 mm bore and 13.55 kN per millimetre of the 93 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 27.95 kg (27950 g) (1.07 g per mm² of the 280×93 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 130 mm bore this is among the largest catalogue sizes; the 1,570 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 1380 kN at 130 mm bore — for slow heavy positions SL192326-TB-XL-BR is the wide dimension-series 23 execution of the single-row full-complement principle: a markedly wider 93 mm ring carries more and longer rollers than the 29/30-series sizes -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 1260 kN C rating and longer nominal life come without an envelope change. Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1260 kN C. Reading -BR: surface oxide treatment, common on the large TB-design sizes such as this 130 mm-bore bearing; it does not change dimensions or ratings. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 280 mm outside diameter and 1260 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 130 mm seat, and in rolling-mill and steel-industry drives the 27.95 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 93 mm width and the published 1380 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL192326-TB-XL-BR?", "a": "The SL192326-TB-XL-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 280 mm outside diameter, 130 mm bore and 93 mm width, envelope 130×280×93 mm. Mass is 27.95 kg." }, { "q": "What does the SL192326-TB-XL-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192326-TB-XL-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 130×280×93 mm and the catalogue ratings are C 1260 kN, C0 1380 kN, Cur 225 kN." }, { "q": "What is the load capacity of the SL192326-TB-XL-BR?", "a": "The basic dynamic load rating C is 1260 kN and the basic static load rating C0 is 1380 kN; the fatigue load limit Cur is 225 kN." }, { "q": "What is the maximum speed of the SL192326-TB-XL-BR?", "a": "The limiting speed is 1,570 r/min and the thermal reference speed is 1,040 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192326-TB-XL-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192326-TB-XL-BR", "SL192326-TB-XL-BR" ], "locale_variants": {} }, { "sku": "SL182928-XL", "brand": "FAG", "manufacturer_designation": "SL182928-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 260, "static_load_kN": 375, "fatigue_load_limit_kN": 61, "limiting_speed_rpm": 1950, "max_rpm": 1950, "reference_speed_rpm": 1370, "weight_g": 2420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×190×30 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 260 kN and C0 375 kN; with a C/C0 ratio of 0.69 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 61 kN, the limiting speed 1,950 r/min and the thermal reference speed 1,370 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.86 kN per millimetre of the 140 mm bore and 8.67 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.42 kg (2420 g) (0.42 g per mm² of the 190×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 140 mm bore this is among the largest catalogue sizes; the 1,950 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position In the 190 mm envelope the cageless pack raises C0 to 375 kN; the trade is the 1,950 r/min limiting speed, set by roller-to-roller sliding rather than by a cage High radial rigidity at 260 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery X-life status (-XL) indicates the current Schaeffler premium execution at 140 mm bore; the 375 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 190 mm outside diameter and 260 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 140 mm seat, and in construction machinery slewing drives the 2.42 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 30 mm width and the published 375 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL182928-XL?", "a": "The SL182928-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 190 mm outside diameter, 140 mm bore and 30 mm width, envelope 140×190×30 mm. Mass is 2.42 kg." }, { "q": "What does the SL182928-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182928-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 140×190×30 mm and the catalogue ratings are C 260 kN, C0 375 kN, Cur 61 kN." }, { "q": "What is the load capacity of the SL182928-XL?", "a": "The basic dynamic load rating C is 260 kN and the basic static load rating C0 is 375 kN; the fatigue load limit Cur is 61 kN." }, { "q": "What is the maximum speed of the SL182928-XL?", "a": "The limiting speed is 1,950 r/min and the thermal reference speed is 1,370 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182928-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182928", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182928-XL", "SL182928-XL" ], "locale_variants": {} }, { "sku": "SL183028", "brand": "FAG", "manufacturer_designation": "SL183028", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 450, "static_load_kN": 660, "fatigue_load_limit_kN": 90, "limiting_speed_rpm": 1820, "max_rpm": 1820, "reference_speed_rpm": 1470, "weight_g": 6040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×210×53 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 450 kN and C0 660 kN; with a C/C0 ratio of 0.68 the 53 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 90 kN, the limiting speed 1,820 r/min and the thermal reference speed 1,470 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.21 kN per millimetre of the 140 mm bore and 8.49 kN per millimetre of the 53 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.04 kg (6040 g) (0.54 g per mm² of the 210×53 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 140 mm bore puts this execution at the top of the HR1 range — the 210 mm outside diameter, 53 mm width and 6.04 kg mass are built for primary-industry load cases High radial rigidity at 450 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 35.0 mm section height between the 140 mm bore and the 210 mm outside diameter Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 210 mm outside diameter and 450 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 140 mm seat, and in construction machinery slewing drives the 6.04 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 53 mm width and the published 660 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL183028?", "a": "The SL183028 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 210 mm outside diameter, 140 mm bore and 53 mm width, envelope 140×210×53 mm. Mass is 6.04 kg." }, { "q": "What does the SL183028 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183028 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 140×210×53 mm and the catalogue ratings are C 450 kN, C0 660 kN, Cur 90 kN." }, { "q": "What is the load capacity of the SL183028?", "a": "The basic dynamic load rating C is 450 kN and the basic static load rating C0 is 660 kN; the fatigue load limit Cur is 90 kN." }, { "q": "What is the maximum speed of the SL183028?", "a": "The limiting speed is 1,820 r/min and the thermal reference speed is 1,470 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183028?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183028", "SL183028" ], "locale_variants": {} }, { "sku": "SL182228", "brand": "FAG", "manufacturer_designation": "SL182228", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 720, "static_load_kN": 1000, "fatigue_load_limit_kN": 134, "limiting_speed_rpm": 1660, "max_rpm": 1660, "reference_speed_rpm": 1230, "weight_g": 14470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×250×68 mm with a 55.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 720 kN and C0 1000 kN; with a C/C0 ratio of 0.72 the 68 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 134 kN, the limiting speed 1,660 r/min and the thermal reference speed 1,230 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.14 kN per millimetre of the 140 mm bore and 10.59 kN per millimetre of the 68 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 14.47 kg (14470 g) (0.85 g per mm² of the 250×68 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 140 mm bore puts this execution at the top of the HR1 range — the 250 mm outside diameter, 68 mm width and 14.47 kg mass are built for primary-industry load cases Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 250 mm outside diameter and 720 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 140 mm seat, and in rolling-mill and steel-industry drives the 14.47 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 68 mm width and the published 1000 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182228?", "a": "The SL182228 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 250 mm outside diameter, 140 mm bore and 68 mm width, envelope 140×250×68 mm. Mass is 14.47 kg." }, { "q": "What does the SL182228 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182228 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 140×250×68 mm and the catalogue ratings are C 720 kN, C0 1000 kN, Cur 134 kN." }, { "q": "What is the load capacity of the SL182228?", "a": "The basic dynamic load rating C is 720 kN and the basic static load rating C0 is 1000 kN; the fatigue load limit Cur is 134 kN." }, { "q": "What is the maximum speed of the SL182228?", "a": "The limiting speed is 1,660 r/min and the thermal reference speed is 1,230 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182228?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182228", "SL182228" ], "locale_variants": {} }, { "sku": "SL192328-TB-XL-BR", "brand": "FAG", "manufacturer_designation": "SL192328-TB-XL-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1410, "static_load_kN": 1570, "fatigue_load_limit_kN": 250, "limiting_speed_rpm": 1470, "max_rpm": 1470, "reference_speed_rpm": 970, "weight_g": 34900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×300×102 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1410 kN and C0 1570 kN; with a C/C0 ratio of 0.90 the 102 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 250 kN, the limiting speed 1,470 r/min and the thermal reference speed 970 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 10.07 kN per millimetre of the 140 mm bore and 13.82 kN per millimetre of the 102 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 34.9 kg (34900 g) (1.14 g per mm² of the 300×102 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 140 mm bore this is among the largest catalogue sizes; the 1,470 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Large SL1923 sizes in HR1 are typically the TB design with oxide-finished surfaces; the 34.9 kg mass reflects the thick, deformation-resistant rings At 1,470 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 1410 kN dynamic rating The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 1,470 r/min limit. Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1410 kN C. The -BR suffix gives the rings and rollers an oxide surface finish (black finish) that resists corrosion during storage, transport and mounting. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 300 mm outside diameter and 1410 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 140 mm seat, and in marine and offshore winch arrangements the 34.9 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 102 mm width and the published 1570 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192328-TB-XL-BR?", "a": "The SL192328-TB-XL-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 300 mm outside diameter, 140 mm bore and 102 mm width, envelope 140×300×102 mm. Mass is 34.9 kg." }, { "q": "What does the SL192328-TB-XL-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192328-TB-XL-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 140×300×102 mm and the catalogue ratings are C 1410 kN, C0 1570 kN, Cur 250 kN." }, { "q": "What is the load capacity of the SL192328-TB-XL-BR?", "a": "The basic dynamic load rating C is 1410 kN and the basic static load rating C0 is 1570 kN; the fatigue load limit Cur is 250 kN." }, { "q": "What is the maximum speed of the SL192328-TB-XL-BR?", "a": "The limiting speed is 1,470 r/min and the thermal reference speed is 970 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192328-TB-XL-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192328-TB-XL-BR", "SL192328-TB-XL-BR" ], "locale_variants": {} }, { "sku": "SL182930-XL", "brand": "FAG", "manufacturer_designation": "SL182930-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 340, "static_load_kN": 480, "fatigue_load_limit_kN": 78, "limiting_speed_rpm": 1790, "max_rpm": 1790, "reference_speed_rpm": 1360, "weight_g": 3770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×210×36 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 340 kN and C0 480 kN; with a C/C0 ratio of 0.71 the 36 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 78 kN, the limiting speed 1,790 r/min and the thermal reference speed 1,360 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.27 kN per millimetre of the 150 mm bore and 9.44 kN per millimetre of the 36 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.77 kg (3770 g) (0.50 g per mm² of the 210×36 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 150 mm bore puts this execution at the top of the HR1 range — the 210 mm outside diameter, 36 mm width and 3.77 kg mass are built for primary-industry load cases Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 150×210×36 mm envelope. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 210 mm outside diameter and 340 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 150 mm seat, and in heavy industrial gearbox shafts the 3.77 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 36 mm width and the published 480 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL182930-XL?", "a": "The SL182930-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 210 mm outside diameter, 150 mm bore and 36 mm width, envelope 150×210×36 mm. Mass is 3.77 kg." }, { "q": "What does the SL182930-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182930-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 150×210×36 mm and the catalogue ratings are C 340 kN, C0 480 kN, Cur 78 kN." }, { "q": "What is the load capacity of the SL182930-XL?", "a": "The basic dynamic load rating C is 340 kN and the basic static load rating C0 is 480 kN; the fatigue load limit Cur is 78 kN." }, { "q": "What is the maximum speed of the SL182930-XL?", "a": "The limiting speed is 1,790 r/min and the thermal reference speed is 1,360 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182930-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182930", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182930-XL", "SL182930-XL" ], "locale_variants": {} }, { "sku": "SL183030", "brand": "FAG", "manufacturer_designation": "SL183030", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 475, "static_load_kN": 700, "fatigue_load_limit_kN": 93, "limiting_speed_rpm": 1740, "max_rpm": 1740, "reference_speed_rpm": 1430, "weight_g": 7330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×225×56 mm with a 37.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 475 kN and C0 700 kN; with a C/C0 ratio of 0.68 the 56 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 93 kN, the limiting speed 1,740 r/min and the thermal reference speed 1,430 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.17 kN per millimetre of the 150 mm bore and 8.48 kN per millimetre of the 56 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 7.33 kg (7330 g) (0.58 g per mm² of the 225×56 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 150 mm bore, 225 mm outside diameter: at this size the 700 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 37.5 mm section height between the 150 mm bore and the 225 mm outside diameter The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 225 mm outside diameter and 475 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 150 mm seat, and in compact slow-speed agitator drives the 7.33 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 56 mm width and the published 700 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL183030?", "a": "The SL183030 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 225 mm outside diameter, 150 mm bore and 56 mm width, envelope 150×225×56 mm. Mass is 7.33 kg." }, { "q": "What does the SL183030 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183030 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 150×225×56 mm and the catalogue ratings are C 475 kN, C0 700 kN, Cur 93 kN." }, { "q": "What is the load capacity of the SL183030?", "a": "The basic dynamic load rating C is 475 kN and the basic static load rating C0 is 700 kN; the fatigue load limit Cur is 93 kN." }, { "q": "What is the maximum speed of the SL183030?", "a": "The limiting speed is 1,740 r/min and the thermal reference speed is 1,430 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183030?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183030", "SL183030" ], "locale_variants": {} }, { "sku": "SL182230", "brand": "FAG", "manufacturer_designation": "SL182230", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 820, "static_load_kN": 1160, "fatigue_load_limit_kN": 154, "limiting_speed_rpm": 1560, "max_rpm": 1560, "reference_speed_rpm": 1130, "weight_g": 18430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×270×73 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 820 kN and C0 1160 kN; with a C/C0 ratio of 0.71 the 73 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 154 kN, the limiting speed 1,560 r/min and the thermal reference speed 1,130 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.47 kN per millimetre of the 150 mm bore and 11.23 kN per millimetre of the 73 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 18.43 kg (18430 g) (0.94 g per mm² of the 270×73 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 150 mm bore, 270 mm outside diameter: at this size the 1160 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 60.0 mm section height between the 150 mm bore and the 270 mm outside diameter In the 270 mm envelope the cageless pack raises C0 to 1160 kN; the trade is the 1,560 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 270 mm outside diameter and 820 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 150 mm seat, and in construction machinery slewing drives the 18.43 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 73 mm width and the published 1160 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182230?", "a": "The SL182230 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 270 mm outside diameter, 150 mm bore and 73 mm width, envelope 150×270×73 mm. Mass is 18.43 kg." }, { "q": "What does the SL182230 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182230 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 150×270×73 mm and the catalogue ratings are C 820 kN, C0 1160 kN, Cur 154 kN." }, { "q": "What is the load capacity of the SL182230?", "a": "The basic dynamic load rating C is 820 kN and the basic static load rating C0 is 1160 kN; the fatigue load limit Cur is 154 kN." }, { "q": "What is the maximum speed of the SL182230?", "a": "The limiting speed is 1,560 r/min and the thermal reference speed is 1,130 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182230?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182230", "SL182230" ], "locale_variants": {} }, { "sku": "SL192330-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192330-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1490, "static_load_kN": 1900, "fatigue_load_limit_kN": 235, "limiting_speed_rpm": 1350, "max_rpm": 1350, "reference_speed_rpm": 840, "weight_g": 42100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×320×108 mm with a 85.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1490 kN and C0 1900 kN; with a C/C0 ratio of 0.78 the 108 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 235 kN, the limiting speed 1,350 r/min and the thermal reference speed 840 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 9.93 kN per millimetre of the 150 mm bore and 13.80 kN per millimetre of the 108 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 42.1 kg (42100 g) (1.22 g per mm² of the 320×108 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 150 mm bore, 320 mm outside diameter: at this size the 1900 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs At 1,350 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 1490 kN dynamic rating SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 1900 kN at 150 mm bore — for slow heavy positions The -TB feature concerns the rib contact, not the envelope: the 150×320×108 mm dimensions and 42.1 kg mass follow the standard series plan. BR-finished surfaces tolerate damp assembly environments better than bare steel, which matters for the large 42.1 kg industrial executions. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 320 mm outside diameter and 1490 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 150 mm seat, and in heavy industrial gearbox shafts the 42.1 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 108 mm width and the published 1900 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL192330-TB-BR?", "a": "The SL192330-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 320 mm outside diameter, 150 mm bore and 108 mm width, envelope 150×320×108 mm. Mass is 42.1 kg." }, { "q": "What does the SL192330-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192330-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 150×320×108 mm and the catalogue ratings are C 1490 kN, C0 1900 kN, Cur 235 kN." }, { "q": "What is the load capacity of the SL192330-TB-BR?", "a": "The basic dynamic load rating C is 1490 kN and the basic static load rating C0 is 1900 kN; the fatigue load limit Cur is 235 kN." }, { "q": "What is the maximum speed of the SL192330-TB-BR?", "a": "The limiting speed is 1,350 r/min and the thermal reference speed is 840 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192330-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192330-TB-BR", "SL192330-TB-BR" ], "locale_variants": {} }, { "sku": "SL182932-XL", "brand": "FAG", "manufacturer_designation": "SL182932-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 350, "static_load_kN": 510, "fatigue_load_limit_kN": 82, "limiting_speed_rpm": 1680, "max_rpm": 1680, "reference_speed_rpm": 1270, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×220×36 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 350 kN and C0 510 kN; with a C/C0 ratio of 0.69 the 36 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 82 kN, the limiting speed 1,680 r/min and the thermal reference speed 1,270 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.19 kN per millimetre of the 160 mm bore and 9.72 kN per millimetre of the 36 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 4 kg (4000 g) (0.51 g per mm² of the 220×36 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 160 mm bore, 220 mm outside diameter: at this size the 510 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs In the 220 mm envelope the cageless pack raises C0 to 510 kN; the trade is the 1,680 r/min limiting speed, set by roller-to-roller sliding rather than by a cage The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 1,680 r/min limit. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 220 mm outside diameter and 350 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 160 mm seat, and in compact slow-speed agitator drives the 4 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 36 mm width and the published 510 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182932-XL?", "a": "The SL182932-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 220 mm outside diameter, 160 mm bore and 36 mm width, envelope 160×220×36 mm. Mass is 4 kg." }, { "q": "What does the SL182932-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182932-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 160×220×36 mm and the catalogue ratings are C 350 kN, C0 510 kN, Cur 82 kN." }, { "q": "What is the load capacity of the SL182932-XL?", "a": "The basic dynamic load rating C is 350 kN and the basic static load rating C0 is 510 kN; the fatigue load limit Cur is 82 kN." }, { "q": "What is the maximum speed of the SL182932-XL?", "a": "The limiting speed is 1,680 r/min and the thermal reference speed is 1,270 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182932-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182932-XL", "SL182932-XL" ], "locale_variants": {} }, { "sku": "SL183032", "brand": "FAG", "manufacturer_designation": "SL183032", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 540, "static_load_kN": 800, "fatigue_load_limit_kN": 105, "limiting_speed_rpm": 1600, "max_rpm": 1600, "reference_speed_rpm": 1280, "weight_g": 8800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×240×60 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 540 kN and C0 800 kN; with a C/C0 ratio of 0.68 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 105 kN, the limiting speed 1,600 r/min and the thermal reference speed 1,280 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.38 kN per millimetre of the 160 mm bore and 9.00 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 8.8 kg (8800 g) (0.61 g per mm² of the 240×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 160 mm bore this is among the largest catalogue sizes; the 1,600 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 40.0 mm section height between the 160 mm bore and the 240 mm outside diameter Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 240 mm outside diameter and 540 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 160 mm seat, and in construction machinery slewing drives the 8.8 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 60 mm width and the published 800 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL183032?", "a": "The SL183032 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 240 mm outside diameter, 160 mm bore and 60 mm width, envelope 160×240×60 mm. Mass is 8.8 kg." }, { "q": "What does the SL183032 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183032 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 160×240×60 mm and the catalogue ratings are C 540 kN, C0 800 kN, Cur 105 kN." }, { "q": "What is the load capacity of the SL183032?", "a": "The basic dynamic load rating C is 540 kN and the basic static load rating C0 is 800 kN; the fatigue load limit Cur is 105 kN." }, { "q": "What is the maximum speed of the SL183032?", "a": "The limiting speed is 1,600 r/min and the thermal reference speed is 1,280 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183032?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183032", "SL183032" ], "locale_variants": {} }, { "sku": "SL182232", "brand": "FAG", "manufacturer_designation": "SL182232", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1020, "static_load_kN": 1470, "fatigue_load_limit_kN": 187, "limiting_speed_rpm": 1370, "max_rpm": 1370, "reference_speed_rpm": 920, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×290×80 mm with a 65.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1020 kN and C0 1470 kN; with a C/C0 ratio of 0.69 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 187 kN, the limiting speed 1,370 r/min and the thermal reference speed 920 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.38 kN per millimetre of the 160 mm bore and 12.75 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 23 kg (23000 g) (0.99 g per mm² of the 290×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 160 mm bore this is among the largest catalogue sizes; the 1,370 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion High radial rigidity at 1020 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 290 mm outside diameter and 1020 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 160 mm seat, and in rolling-mill and steel-industry drives the 23 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 80 mm width and the published 1470 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL182232?", "a": "The SL182232 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 290 mm outside diameter, 160 mm bore and 80 mm width, envelope 160×290×80 mm. Mass is 23 kg." }, { "q": "What does the SL182232 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182232 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 160×290×80 mm and the catalogue ratings are C 1020 kN, C0 1470 kN, Cur 187 kN." }, { "q": "What is the load capacity of the SL182232?", "a": "The basic dynamic load rating C is 1020 kN and the basic static load rating C0 is 1470 kN; the fatigue load limit Cur is 187 kN." }, { "q": "What is the maximum speed of the SL182232?", "a": "The limiting speed is 1,370 r/min and the thermal reference speed is 920 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182232?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182232", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182232", "SL182232" ], "locale_variants": {} }, { "sku": "SL192332-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192332-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 340, "B_mm": 114, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1690, "static_load_kN": 2170, "fatigue_load_limit_kN": 244, "limiting_speed_rpm": 1250, "max_rpm": 1250, "reference_speed_rpm": 760, "weight_g": 49700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×340×114 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1690 kN and C0 2170 kN; with a C/C0 ratio of 0.78 the 114 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 244 kN, the limiting speed 1,250 r/min and the thermal reference speed 760 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 10.56 kN per millimetre of the 160 mm bore and 14.82 kN per millimetre of the 114 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 49.7 kg (49700 g) (1.28 g per mm² of the 340×114 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 160 mm bore this is among the largest catalogue sizes; the 1,250 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL192332-TB-BR is the wide dimension-series 23 execution of the single-row full-complement principle: a markedly wider 114 mm ring carries more and longer rollers than the 29/30-series sizes The 114 mm width versus 340 mm outside diameter gives this series its characteristic squat proportions and high tipping rigidity under eccentric loads -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. BR-finished surfaces tolerate damp assembly environments better than bare steel, which matters for the large 49.7 kg industrial executions. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 340 mm outside diameter and 1690 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 160 mm seat, and in planetary gear bearing positions the 49.7 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 114 mm width and the published 2170 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL192332-TB-BR?", "a": "The SL192332-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 340 mm outside diameter, 160 mm bore and 114 mm width, envelope 160×340×114 mm. Mass is 49.7 kg." }, { "q": "What does the SL192332-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192332-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 160×340×114 mm and the catalogue ratings are C 1690 kN, C0 2170 kN, Cur 244 kN." }, { "q": "What is the load capacity of the SL192332-TB-BR?", "a": "The basic dynamic load rating C is 1690 kN and the basic static load rating C0 is 2170 kN; the fatigue load limit Cur is 244 kN." }, { "q": "What is the maximum speed of the SL192332-TB-BR?", "a": "The limiting speed is 1,250 r/min and the thermal reference speed is 760 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192332-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192332", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192332-TB-BR", "SL192332-TB-BR" ], "locale_variants": {} }, { "sku": "SL182934-XL", "brand": "FAG", "manufacturer_designation": "SL182934-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 365, "static_load_kN": 540, "fatigue_load_limit_kN": 85, "limiting_speed_rpm": 1590, "max_rpm": 1590, "reference_speed_rpm": 1190, "weight_g": 4300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×230×36 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 365 kN and C0 540 kN; with a C/C0 ratio of 0.68 the 36 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 85 kN, the limiting speed 1,590 r/min and the thermal reference speed 1,190 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.15 kN per millimetre of the 170 mm bore and 10.14 kN per millimetre of the 36 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 4.3 kg (4300 g) (0.52 g per mm² of the 230×36 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 170 mm bore, 230 mm outside diameter: at this size the 540 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL182934-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion X-life status (-XL) indicates the current Schaeffler premium execution at 170 mm bore; the 540 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 230 mm outside diameter and 365 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 170 mm seat, and in planetary gear bearing positions the 4.3 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 36 mm width and the published 540 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182934-XL?", "a": "The SL182934-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 230 mm outside diameter, 170 mm bore and 36 mm width, envelope 170×230×36 mm. Mass is 4.3 kg." }, { "q": "What does the SL182934-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182934-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 170×230×36 mm and the catalogue ratings are C 365 kN, C0 540 kN, Cur 85 kN." }, { "q": "What is the load capacity of the SL182934-XL?", "a": "The basic dynamic load rating C is 365 kN and the basic static load rating C0 is 540 kN; the fatigue load limit Cur is 85 kN." }, { "q": "What is the maximum speed of the SL182934-XL?", "a": "The limiting speed is 1,590 r/min and the thermal reference speed is 1,190 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182934-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182934", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182934-XL", "SL182934-XL" ], "locale_variants": {} }, { "sku": "SL183034", "brand": "FAG", "manufacturer_designation": "SL183034", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 700, "static_load_kN": 1050, "fatigue_load_limit_kN": 135, "limiting_speed_rpm": 1480, "max_rpm": 1480, "reference_speed_rpm": 1120, "weight_g": 12200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×260×67 mm with a 45.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 700 kN and C0 1050 kN; with a C/C0 ratio of 0.67 the 67 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 135 kN, the limiting speed 1,480 r/min and the thermal reference speed 1,120 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.12 kN per millimetre of the 170 mm bore and 10.45 kN per millimetre of the 67 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 12.2 kg (12200 g) (0.70 g per mm² of the 260×67 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 170 mm bore puts this execution at the top of the HR1 range — the 260 mm outside diameter, 67 mm width and 12.2 kg mass are built for primary-industry load cases SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly High radial rigidity at 700 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 260 mm outside diameter and 700 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 170 mm seat, and in rolling-mill and steel-industry drives the 12.2 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 67 mm width and the published 1050 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL183034?", "a": "The SL183034 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 260 mm outside diameter, 170 mm bore and 67 mm width, envelope 170×260×67 mm. Mass is 12.2 kg." }, { "q": "What does the SL183034 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183034 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 170×260×67 mm and the catalogue ratings are C 700 kN, C0 1050 kN, Cur 135 kN." }, { "q": "What is the load capacity of the SL183034?", "a": "The basic dynamic load rating C is 700 kN and the basic static load rating C0 is 1050 kN; the fatigue load limit Cur is 135 kN." }, { "q": "What is the maximum speed of the SL183034?", "a": "The limiting speed is 1,480 r/min and the thermal reference speed is 1,120 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183034?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183034", "SL183034" ], "locale_variants": {} }, { "sku": "SL182234", "brand": "FAG", "manufacturer_designation": "SL182234", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 310, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1140, "static_load_kN": 1660, "fatigue_load_limit_kN": 208, "limiting_speed_rpm": 1300, "max_rpm": 1300, "reference_speed_rpm": 870, "weight_g": 28650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×310×86 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1140 kN and C0 1660 kN; with a C/C0 ratio of 0.69 the 86 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 208 kN, the limiting speed 1,300 r/min and the thermal reference speed 870 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.71 kN per millimetre of the 170 mm bore and 13.26 kN per millimetre of the 86 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 28.65 kg (28650 g) (1.07 g per mm² of the 310×86 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 170 mm bore puts this execution at the top of the HR1 range — the 310 mm outside diameter, 86 mm width and 28.65 kg mass are built for primary-industry load cases SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly SL182234 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 310 mm outside diameter and 1140 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 170 mm seat, and in marine and offshore winch arrangements the 28.65 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 86 mm width and the published 1660 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182234?", "a": "The SL182234 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 310 mm outside diameter, 170 mm bore and 86 mm width, envelope 170×310×86 mm. Mass is 28.65 kg." }, { "q": "What does the SL182234 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182234 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 170×310×86 mm and the catalogue ratings are C 1140 kN, C0 1660 kN, Cur 208 kN." }, { "q": "What is the load capacity of the SL182234?", "a": "The basic dynamic load rating C is 1140 kN and the basic static load rating C0 is 1660 kN; the fatigue load limit Cur is 208 kN." }, { "q": "What is the maximum speed of the SL182234?", "a": "The limiting speed is 1,300 r/min and the thermal reference speed is 870 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182234?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182234", "SL182234" ], "locale_variants": {} }, { "sku": "SL192334-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192334-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 360, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1830, "static_load_kN": 2380, "fatigue_load_limit_kN": 270, "limiting_speed_rpm": 1200, "max_rpm": 1200, "reference_speed_rpm": 730, "weight_g": 59200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×360×120 mm with a 95.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1830 kN and C0 2380 kN; with a C/C0 ratio of 0.77 the 120 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 270 kN, the limiting speed 1,200 r/min and the thermal reference speed 730 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 10.76 kN per millimetre of the 170 mm bore and 15.25 kN per millimetre of the 120 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 59.2 kg (59200 g) (1.37 g per mm² of the 360×120 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 170 mm bore puts this execution at the top of the HR1 range — the 360 mm outside diameter, 120 mm width and 59.2 kg mass are built for primary-industry load cases SL192334-TB-BR is the wide dimension-series 23 execution of the single-row full-complement principle: a markedly wider 120 mm ring carries more and longer rollers than the 29/30-series sizes The 120 mm width versus 360 mm outside diameter gives this series its characteristic squat proportions and high tipping rigidity under eccentric loads Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1830 kN C. The -BR coating is a handling and storage protection; once mounted and greased, the 360 mm bearing operates to its normal 1,200 r/min limit. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 360 mm outside diameter and 1830 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 170 mm seat, and in vibrating and oscillating machinery the 59.2 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 120 mm width and the published 2380 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL192334-TB-BR?", "a": "The SL192334-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 360 mm outside diameter, 170 mm bore and 120 mm width, envelope 170×360×120 mm. Mass is 59.2 kg." }, { "q": "What does the SL192334-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192334-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 170×360×120 mm and the catalogue ratings are C 1830 kN, C0 2380 kN, Cur 270 kN." }, { "q": "What is the load capacity of the SL192334-TB-BR?", "a": "The basic dynamic load rating C is 1830 kN and the basic static load rating C0 is 2380 kN; the fatigue load limit Cur is 270 kN." }, { "q": "What is the maximum speed of the SL192334-TB-BR?", "a": "The limiting speed is 1,200 r/min and the thermal reference speed is 730 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192334-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192334", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192334-TB-BR", "SL192334-TB-BR" ], "locale_variants": {} }, { "sku": "SL182936-XL", "brand": "FAG", "manufacturer_designation": "SL182936-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 455, "static_load_kN": 680, "fatigue_load_limit_kN": 106, "limiting_speed_rpm": 1500, "max_rpm": 1500, "reference_speed_rpm": 1150, "weight_g": 6200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×250×42 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 455 kN and C0 680 kN; with a C/C0 ratio of 0.67 the 42 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 106 kN, the limiting speed 1,500 r/min and the thermal reference speed 1,150 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.53 kN per millimetre of the 180 mm bore and 10.83 kN per millimetre of the 42 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.2 kg (6200 g) (0.59 g per mm² of the 250×42 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 180 mm bore, 250 mm outside diameter: at this size the 680 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value SL182936-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs X-life status (-XL) indicates the current Schaeffler premium execution at 180 mm bore; the 680 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 250 mm outside diameter and 455 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 180 mm seat, and in marine and offshore winch arrangements the 6.2 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 42 mm width and the published 680 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182936-XL?", "a": "The SL182936-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 250 mm outside diameter, 180 mm bore and 42 mm width, envelope 180×250×42 mm. Mass is 6.2 kg." }, { "q": "What does the SL182936-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182936-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 180×250×42 mm and the catalogue ratings are C 455 kN, C0 680 kN, Cur 106 kN." }, { "q": "What is the load capacity of the SL182936-XL?", "a": "The basic dynamic load rating C is 455 kN and the basic static load rating C0 is 680 kN; the fatigue load limit Cur is 106 kN." }, { "q": "What is the maximum speed of the SL182936-XL?", "a": "The limiting speed is 1,500 r/min and the thermal reference speed is 1,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182936-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182936-XL", "SL182936-XL" ], "locale_variants": {} }, { "sku": "SL183036", "brand": "FAG", "manufacturer_designation": "SL183036", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 810, "static_load_kN": 1240, "fatigue_load_limit_kN": 157, "limiting_speed_rpm": 1370, "max_rpm": 1370, "reference_speed_rpm": 1020, "weight_g": 16100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×280×74 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 810 kN and C0 1240 kN; with a C/C0 ratio of 0.65 the 74 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 157 kN, the limiting speed 1,370 r/min and the thermal reference speed 1,020 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.50 kN per millimetre of the 180 mm bore and 10.95 kN per millimetre of the 74 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 16.1 kg (16100 g) (0.78 g per mm² of the 280×74 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 180 mm bore, 280 mm outside diameter: at this size the 1240 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 280 mm outside diameter and 810 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 180 mm seat, and in marine and offshore winch arrangements the 16.1 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 74 mm width and the published 1240 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL183036?", "a": "The SL183036 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 280 mm outside diameter, 180 mm bore and 74 mm width, envelope 180×280×74 mm. Mass is 16.1 kg." }, { "q": "What does the SL183036 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183036 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 180×280×74 mm and the catalogue ratings are C 810 kN, C0 1240 kN, Cur 157 kN." }, { "q": "What is the load capacity of the SL183036?", "a": "The basic dynamic load rating C is 810 kN and the basic static load rating C0 is 1240 kN; the fatigue load limit Cur is 157 kN." }, { "q": "What is the maximum speed of the SL183036?", "a": "The limiting speed is 1,370 r/min and the thermal reference speed is 1,020 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183036?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183036", "SL183036" ], "locale_variants": {} }, { "sku": "SL182236", "brand": "FAG", "manufacturer_designation": "SL182236", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 320, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1180, "static_load_kN": 1760, "fatigue_load_limit_kN": 218, "limiting_speed_rpm": 1230, "max_rpm": 1230, "reference_speed_rpm": 800, "weight_g": 29800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×320×86 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1180 kN and C0 1760 kN; with a C/C0 ratio of 0.67 the 86 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 218 kN, the limiting speed 1,230 r/min and the thermal reference speed 800 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.56 kN per millimetre of the 180 mm bore and 13.72 kN per millimetre of the 86 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 29.8 kg (29800 g) (1.08 g per mm² of the 320×86 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 180 mm bore, 320 mm outside diameter: at this size the 1760 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value In the 320 mm envelope the cageless pack raises C0 to 1760 kN; the trade is the 1,230 r/min limiting speed, set by roller-to-roller sliding rather than by a cage Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 320 mm outside diameter and 1180 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 180 mm seat, and in vibrating and oscillating machinery the 29.8 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 86 mm width and the published 1760 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182236?", "a": "The SL182236 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 320 mm outside diameter, 180 mm bore and 86 mm width, envelope 180×320×86 mm. Mass is 29.8 kg." }, { "q": "What does the SL182236 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182236 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 180×320×86 mm and the catalogue ratings are C 1180 kN, C0 1760 kN, Cur 218 kN." }, { "q": "What is the load capacity of the SL182236?", "a": "The basic dynamic load rating C is 1180 kN and the basic static load rating C0 is 1760 kN; the fatigue load limit Cur is 218 kN." }, { "q": "What is the maximum speed of the SL182236?", "a": "The limiting speed is 1,230 r/min and the thermal reference speed is 800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182236?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182236", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182236", "SL182236" ], "locale_variants": {} }, { "sku": "SL192336-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192336-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 380, "B_mm": 126, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1940, "static_load_kN": 2600, "fatigue_load_limit_kN": 285, "limiting_speed_rpm": 1120, "max_rpm": 1120, "reference_speed_rpm": 670, "weight_g": 69100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×380×126 mm with a 100.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1940 kN and C0 2600 kN; with a C/C0 ratio of 0.75 the 126 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 285 kN, the limiting speed 1,120 r/min and the thermal reference speed 670 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 10.78 kN per millimetre of the 180 mm bore and 15.40 kN per millimetre of the 126 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 69.1 kg (69100 g) (1.44 g per mm² of the 380×126 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 180 mm bore, 380 mm outside diameter: at this size the 2600 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity At 1,120 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 1940 kN dynamic rating The -TB feature concerns the rib contact, not the envelope: the 180×380×126 mm dimensions and 69.1 kg mass follow the standard series plan. The -BR coating is a handling and storage protection; once mounted and greased, the 380 mm bearing operates to its normal 1,120 r/min limit. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 380 mm outside diameter and 1940 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 180 mm seat, and in compact slow-speed agitator drives the 69.1 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 126 mm width and the published 2600 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192336-TB-BR?", "a": "The SL192336-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 380 mm outside diameter, 180 mm bore and 126 mm width, envelope 180×380×126 mm. Mass is 69.1 kg." }, { "q": "What does the SL192336-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192336-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 180×380×126 mm and the catalogue ratings are C 1940 kN, C0 2600 kN, Cur 285 kN." }, { "q": "What is the load capacity of the SL192336-TB-BR?", "a": "The basic dynamic load rating C is 1940 kN and the basic static load rating C0 is 2600 kN; the fatigue load limit Cur is 285 kN." }, { "q": "What is the maximum speed of the SL192336-TB-BR?", "a": "The limiting speed is 1,120 r/min and the thermal reference speed is 670 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192336-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192336", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192336-TB-BR", "SL192336-TB-BR" ], "locale_variants": {} }, { "sku": "SL182938-XL", "brand": "FAG", "manufacturer_designation": "SL182938-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 510, "static_load_kN": 770, "fatigue_load_limit_kN": 118, "limiting_speed_rpm": 1420, "max_rpm": 1420, "reference_speed_rpm": 1030, "weight_g": 6500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×260×42 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 510 kN and C0 770 kN; with a C/C0 ratio of 0.66 the 42 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 118 kN, the limiting speed 1,420 r/min and the thermal reference speed 1,030 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.68 kN per millimetre of the 190 mm bore and 12.14 kN per millimetre of the 42 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.5 kg (6500 g) (0.60 g per mm² of the 260×42 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 190 mm bore this is among the largest catalogue sizes; the 1,420 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly High radial rigidity at 510 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 118 kN Cur value. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 260 mm outside diameter and 510 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 190 mm seat, and in vibrating and oscillating machinery the 6.5 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 42 mm width and the published 770 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182938-XL?", "a": "The SL182938-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 260 mm outside diameter, 190 mm bore and 42 mm width, envelope 190×260×42 mm. Mass is 6.5 kg." }, { "q": "What does the SL182938-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182938-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 190×260×42 mm and the catalogue ratings are C 510 kN, C0 770 kN, Cur 118 kN." }, { "q": "What is the load capacity of the SL182938-XL?", "a": "The basic dynamic load rating C is 510 kN and the basic static load rating C0 is 770 kN; the fatigue load limit Cur is 118 kN." }, { "q": "What is the maximum speed of the SL182938-XL?", "a": "The limiting speed is 1,420 r/min and the thermal reference speed is 1,030 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182938-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182938-XL", "SL182938-XL" ], "locale_variants": {} }, { "sku": "SL183038", "brand": "FAG", "manufacturer_designation": "SL183038", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 830, "static_load_kN": 1300, "fatigue_load_limit_kN": 163, "limiting_speed_rpm": 1320, "max_rpm": 1320, "reference_speed_rpm": 970, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×290×75 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 830 kN and C0 1300 kN; with a C/C0 ratio of 0.64 the 75 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 163 kN, the limiting speed 1,320 r/min and the thermal reference speed 970 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.37 kN per millimetre of the 190 mm bore and 11.07 kN per millimetre of the 75 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 17 kg (17000 g) (0.78 g per mm² of the 290×75 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 190 mm bore this is among the largest catalogue sizes; the 1,320 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL183038 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 290 mm outside diameter and 830 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 190 mm seat, and in vibrating and oscillating machinery the 17 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 75 mm width and the published 1300 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL183038?", "a": "The SL183038 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 290 mm outside diameter, 190 mm bore and 75 mm width, envelope 190×290×75 mm. Mass is 17 kg." }, { "q": "What does the SL183038 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183038 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 190×290×75 mm and the catalogue ratings are C 830 kN, C0 1300 kN, Cur 163 kN." }, { "q": "What is the load capacity of the SL183038?", "a": "The basic dynamic load rating C is 830 kN and the basic static load rating C0 is 1300 kN; the fatigue load limit Cur is 163 kN." }, { "q": "What is the maximum speed of the SL183038?", "a": "The limiting speed is 1,320 r/min and the thermal reference speed is 970 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183038?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183038", "SL183038" ], "locale_variants": {} }, { "sku": "SL182238", "brand": "FAG", "manufacturer_designation": "SL182238", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 340, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1300, "static_load_kN": 1900, "fatigue_load_limit_kN": 232, "limiting_speed_rpm": 1170, "max_rpm": 1170, "reference_speed_rpm": 770, "weight_g": 35650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×340×92 mm with a 75.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1300 kN and C0 1900 kN; with a C/C0 ratio of 0.68 the 92 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 232 kN, the limiting speed 1,170 r/min and the thermal reference speed 770 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.84 kN per millimetre of the 190 mm bore and 14.13 kN per millimetre of the 92 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 35.65 kg (35650 g) (1.14 g per mm² of the 340×92 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 190 mm bore this is among the largest catalogue sizes; the 1,170 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL182238 is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 340 mm outside diameter and 1300 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 190 mm seat, and in crane travelling-wheel mechanisms the 35.65 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 92 mm width and the published 1900 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL182238?", "a": "The SL182238 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 340 mm outside diameter, 190 mm bore and 92 mm width, envelope 190×340×92 mm. Mass is 35.65 kg." }, { "q": "What does the SL182238 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182238 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 190×340×92 mm and the catalogue ratings are C 1300 kN, C0 1900 kN, Cur 232 kN." }, { "q": "What is the load capacity of the SL182238?", "a": "The basic dynamic load rating C is 1300 kN and the basic static load rating C0 is 1900 kN; the fatigue load limit Cur is 232 kN." }, { "q": "What is the maximum speed of the SL182238?", "a": "The limiting speed is 1,170 r/min and the thermal reference speed is 770 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182238?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182238", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182238", "SL182238" ], "locale_variants": {} }, { "sku": "SL192338-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192338-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 400, "B_mm": 132, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2220, "static_load_kN": 2950, "fatigue_load_limit_kN": 320, "limiting_speed_rpm": 1090, "max_rpm": 1090, "reference_speed_rpm": 630, "weight_g": 80300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×400×132 mm with a 105.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2220 kN and C0 2950 kN; with a C/C0 ratio of 0.75 the 132 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 320 kN, the limiting speed 1,090 r/min and the thermal reference speed 630 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 11.68 kN per millimetre of the 190 mm bore and 16.82 kN per millimetre of the 132 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 80.3 kg (80300 g) (1.52 g per mm² of the 400×132 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 190 mm bore this is among the largest catalogue sizes; the 1,090 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity At 1,090 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 2220 kN dynamic rating -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. The -BR suffix gives the rings and rollers an oxide surface finish (black finish) that resists corrosion during storage, transport and mounting. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 400 mm outside diameter and 2220 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 190 mm seat, and in rope drums and winch drums the 80.3 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 132 mm width and the published 2950 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192338-TB-BR?", "a": "The SL192338-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 400 mm outside diameter, 190 mm bore and 132 mm width, envelope 190×400×132 mm. Mass is 80.3 kg." }, { "q": "What does the SL192338-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192338-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 190×400×132 mm and the catalogue ratings are C 2220 kN, C0 2950 kN, Cur 320 kN." }, { "q": "What is the load capacity of the SL192338-TB-BR?", "a": "The basic dynamic load rating C is 2220 kN and the basic static load rating C0 is 2950 kN; the fatigue load limit Cur is 320 kN." }, { "q": "What is the maximum speed of the SL192338-TB-BR?", "a": "The limiting speed is 1,090 r/min and the thermal reference speed is 630 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192338-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192338", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=523", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192338-TB-BR", "SL192338-TB-BR" ], "locale_variants": {} }, { "sku": "SL182940-XL", "brand": "FAG", "manufacturer_designation": "SL182940-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 610, "static_load_kN": 940, "fatigue_load_limit_kN": 142, "limiting_speed_rpm": 1320, "max_rpm": 1320, "reference_speed_rpm": 950, "weight_g": 9100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×280×48 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 610 kN and C0 940 kN; with a C/C0 ratio of 0.65 the 48 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 142 kN, the limiting speed 1,320 r/min and the thermal reference speed 950 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.05 kN per millimetre of the 200 mm bore and 12.71 kN per millimetre of the 48 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 9.1 kg (9100 g) (0.68 g per mm² of the 280×48 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 200 mm bore puts this execution at the top of the HR1 range — the 280 mm outside diameter, 48 mm width and 9.1 kg mass are built for primary-industry load cases The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 40.0 mm section height between the 200 mm bore and the 280 mm outside diameter SL182940-XL is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 1,320 r/min limit. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 280 mm outside diameter and 610 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 200 mm seat, and in rolling-mill and steel-industry drives the 9.1 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 48 mm width and the published 940 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182940-XL?", "a": "The SL182940-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 280 mm outside diameter, 200 mm bore and 48 mm width, envelope 200×280×48 mm. Mass is 9.1 kg." }, { "q": "What does the SL182940-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182940-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 200×280×48 mm and the catalogue ratings are C 610 kN, C0 940 kN, Cur 142 kN." }, { "q": "What is the load capacity of the SL182940-XL?", "a": "The basic dynamic load rating C is 610 kN and the basic static load rating C0 is 940 kN; the fatigue load limit Cur is 142 kN." }, { "q": "What is the maximum speed of the SL182940-XL?", "a": "The limiting speed is 1,320 r/min and the thermal reference speed is 950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182940-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182940-XL", "SL182940-XL" ], "locale_variants": {} }, { "sku": "SL183040", "brand": "FAG", "manufacturer_designation": "SL183040", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 950, "static_load_kN": 1510, "fatigue_load_limit_kN": 187, "limiting_speed_rpm": 1230, "max_rpm": 1230, "reference_speed_rpm": 890, "weight_g": 21800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×310×82 mm with a 55.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 950 kN and C0 1510 kN; with a C/C0 ratio of 0.63 the 82 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 187 kN, the limiting speed 1,230 r/min and the thermal reference speed 890 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.75 kN per millimetre of the 200 mm bore and 11.59 kN per millimetre of the 82 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 21.8 kg (21800 g) (0.86 g per mm² of the 310×82 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 200 mm bore puts this execution at the top of the HR1 range — the 310 mm outside diameter, 82 mm width and 21.8 kg mass are built for primary-industry load cases High radial rigidity at 950 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 310 mm outside diameter and 950 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 200 mm seat, and in marine and offshore winch arrangements the 21.8 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 82 mm width and the published 1510 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL183040?", "a": "The SL183040 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 310 mm outside diameter, 200 mm bore and 82 mm width, envelope 200×310×82 mm. Mass is 21.8 kg." }, { "q": "What does the SL183040 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183040 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 200×310×82 mm and the catalogue ratings are C 950 kN, C0 1510 kN, Cur 187 kN." }, { "q": "What is the load capacity of the SL183040?", "a": "The basic dynamic load rating C is 950 kN and the basic static load rating C0 is 1510 kN; the fatigue load limit Cur is 187 kN." }, { "q": "What is the maximum speed of the SL183040?", "a": "The limiting speed is 1,230 r/min and the thermal reference speed is 890 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183040?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183040", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183040", "SL183040" ], "locale_variants": {} }, { "sku": "SL182240", "brand": "FAG", "manufacturer_designation": "SL182240", "series": "sl1822-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 360, "B_mm": 98, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1410, "static_load_kN": 2010, "fatigue_load_limit_kN": 245, "limiting_speed_rpm": 1150, "max_rpm": 1150, "reference_speed_rpm": 770, "weight_g": 43120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×360×98 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1410 kN and C0 2010 kN; with a C/C0 ratio of 0.70 the 98 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 245 kN, the limiting speed 1,150 r/min and the thermal reference speed 770 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.05 kN per millimetre of the 200 mm bore and 14.39 kN per millimetre of the 98 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 43.12 kg (43120 g) (1.22 g per mm² of the 360×98 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 200 mm bore puts this execution at the top of the HR1 range — the 360 mm outside diameter, 98 mm width and 43.12 kg mass are built for primary-industry load cases In the 360 mm envelope the cageless pack raises C0 to 2010 kN; the trade is the 1,150 r/min limiting speed, set by roller-to-roller sliding rather than by a cage The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 360 mm outside diameter and 1410 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 200 mm seat, and in vibrating and oscillating machinery the 43.12 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 98 mm width and the published 2010 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182240?", "a": "The SL182240 is a SL1822 single-row full-complement semi-locating cylindrical roller bearing with 360 mm outside diameter, 200 mm bore and 98 mm width, envelope 200×360×98 mm. Mass is 43.12 kg." }, { "q": "What does the SL182240 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182240 identifies this SL1822 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 200×360×98 mm and the catalogue ratings are C 1410 kN, C0 2010 kN, Cur 245 kN." }, { "q": "What is the load capacity of the SL182240?", "a": "The basic dynamic load rating C is 1410 kN and the basic static load rating C0 is 2010 kN; the fatigue load limit Cur is 245 kN." }, { "q": "What is the maximum speed of the SL182240?", "a": "The limiting speed is 1,150 r/min and the thermal reference speed is 770 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182240?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182240", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182240", "SL182240" ], "locale_variants": {} }, { "sku": "SL192340-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192340-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 420, "B_mm": 138, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2470, "static_load_kN": 3300, "fatigue_load_limit_kN": 350, "limiting_speed_rpm": 1020, "max_rpm": 1020, "reference_speed_rpm": 570, "weight_g": 92100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×420×138 mm with a 110.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2470 kN and C0 3300 kN; with a C/C0 ratio of 0.75 the 138 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 350 kN, the limiting speed 1,020 r/min and the thermal reference speed 570 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 12.35 kN per millimetre of the 200 mm bore and 17.90 kN per millimetre of the 138 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 92.1 kg (92100 g) (1.59 g per mm² of the 420×138 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 200 mm bore this is among the largest catalogue sizes; the 1,020 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity SL1923 bearings are semi-locating, with one outer-ring rib and two inner-ring ribs; the wide section delivers extreme C0 — 3300 kN at 200 mm bore — for slow heavy positions The -TB suffix denotes the increased axial-load design: profiled roller ends and optimised rib contact geometry lower edge stress and friction at the guide ribs. -BR marks the oxide-treated execution: the thin black conversion coating protects the 2470 kN-rated bearing before it enters lubricated service. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 420 mm outside diameter and 2470 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 200 mm seat, and in material handling conveyor pulleys the 92.1 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 138 mm width and the published 3300 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL192340-TB-BR?", "a": "The SL192340-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 420 mm outside diameter, 200 mm bore and 138 mm width, envelope 200×420×138 mm. Mass is 92.1 kg." }, { "q": "What does the SL192340-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192340-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 200×420×138 mm and the catalogue ratings are C 2470 kN, C0 3300 kN, Cur 350 kN." }, { "q": "What is the load capacity of the SL192340-TB-BR?", "a": "The basic dynamic load rating C is 2470 kN and the basic static load rating C0 is 3300 kN; the fatigue load limit Cur is 350 kN." }, { "q": "What is the maximum speed of the SL192340-TB-BR?", "a": "The limiting speed is 1,020 r/min and the thermal reference speed is 570 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192340-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192340", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192340-TB-BR", "SL192340-TB-BR" ], "locale_variants": {} }, { "sku": "SL182944-XL", "brand": "FAG", "manufacturer_designation": "SL182944-XL", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 650, "static_load_kN": 1030, "fatigue_load_limit_kN": 152, "limiting_speed_rpm": 1210, "max_rpm": 1210, "reference_speed_rpm": 840, "weight_g": 9900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×300×48 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 650 kN and C0 1030 kN; with a C/C0 ratio of 0.63 the 48 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 152 kN, the limiting speed 1,210 r/min and the thermal reference speed 840 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.95 kN per millimetre of the 220 mm bore and 13.54 kN per millimetre of the 48 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 9.9 kg (9900 g) (0.69 g per mm² of the 300×48 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 220 mm bore, 300 mm outside diameter: at this size the 1030 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value In the 300 mm envelope the cageless pack raises C0 to 1030 kN; the trade is the 1,210 r/min limiting speed, set by roller-to-roller sliding rather than by a cage X-life status (-XL) indicates the current Schaeffler premium execution at 220 mm bore; the 1030 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 300 mm outside diameter and 650 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 220 mm seat, and in compact slow-speed agitator drives the 9.9 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 48 mm width and the published 1030 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182944-XL?", "a": "The SL182944-XL is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 300 mm outside diameter, 220 mm bore and 48 mm width, envelope 220×300×48 mm. Mass is 9.9 kg." }, { "q": "What does the SL182944-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL182944-XL identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 220×300×48 mm and the catalogue ratings are C 650 kN, C0 1030 kN, Cur 152 kN." }, { "q": "What is the load capacity of the SL182944-XL?", "a": "The basic dynamic load rating C is 650 kN and the basic static load rating C0 is 1030 kN; the fatigue load limit Cur is 152 kN." }, { "q": "What is the maximum speed of the SL182944-XL?", "a": "The limiting speed is 1,210 r/min and the thermal reference speed is 840 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182944-XL?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182944-XL", "SL182944-XL" ], "locale_variants": {} }, { "sku": "SL183044", "brand": "FAG", "manufacturer_designation": "SL183044", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1150, "static_load_kN": 1820, "fatigue_load_limit_kN": 219, "limiting_speed_rpm": 1140, "max_rpm": 1140, "reference_speed_rpm": 800, "weight_g": 28400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×340×90 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1150 kN and C0 1820 kN; with a C/C0 ratio of 0.63 the 90 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 219 kN, the limiting speed 1,140 r/min and the thermal reference speed 800 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.23 kN per millimetre of the 220 mm bore and 12.78 kN per millimetre of the 90 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 28.4 kg (28400 g) (0.93 g per mm² of the 340×90 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 220 mm bore this is among the largest catalogue sizes; the 1,140 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 60.0 mm section height between the 220 mm bore and the 340 mm outside diameter Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 340 mm outside diameter and 1150 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 220 mm seat, and in crane travelling-wheel mechanisms the 28.4 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 90 mm width and the published 1820 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL183044?", "a": "The SL183044 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 340 mm outside diameter, 220 mm bore and 90 mm width, envelope 220×340×90 mm. Mass is 28.4 kg." }, { "q": "What does the SL183044 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183044 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 220×340×90 mm and the catalogue ratings are C 1150 kN, C0 1820 kN, Cur 219 kN." }, { "q": "What is the load capacity of the SL183044?", "a": "The basic dynamic load rating C is 1150 kN and the basic static load rating C0 is 1820 kN; the fatigue load limit Cur is 219 kN." }, { "q": "What is the maximum speed of the SL183044?", "a": "The limiting speed is 1,140 r/min and the thermal reference speed is 800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183044?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183044", "SL183044" ], "locale_variants": {} }, { "sku": "SL192344-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192344-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 460, "B_mm": 145, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2650, "static_load_kN": 3450, "fatigue_load_limit_kN": 360, "limiting_speed_rpm": 910, "max_rpm": 910, "reference_speed_rpm": 520, "weight_g": 111200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×460×145 mm with a 120.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2650 kN and C0 3450 kN; with a C/C0 ratio of 0.77 the 145 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 360 kN, the limiting speed 910 r/min and the thermal reference speed 520 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 12.05 kN per millimetre of the 220 mm bore and 18.28 kN per millimetre of the 145 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 111.2 kg (111200 g) (1.67 g per mm² of the 460×145 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 220 mm bore, 460 mm outside diameter: at this size the 3450 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The 145 mm width versus 460 mm outside diameter gives this series its characteristic squat proportions and high tipping rigidity under eccentric loads Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. BR-finished surfaces tolerate damp assembly environments better than bare steel, which matters for the large 111.2 kg industrial executions. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 460 mm outside diameter and 2650 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 220 mm seat, and in marine and offshore winch arrangements the 111.2 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 145 mm width and the published 3450 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL192344-TB-BR?", "a": "The SL192344-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 460 mm outside diameter, 220 mm bore and 145 mm width, envelope 220×460×145 mm. Mass is 111.2 kg." }, { "q": "What does the SL192344-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192344-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 220×460×145 mm and the catalogue ratings are C 2650 kN, C0 3450 kN, Cur 360 kN." }, { "q": "What is the load capacity of the SL192344-TB-BR?", "a": "The basic dynamic load rating C is 2650 kN and the basic static load rating C0 is 3450 kN; the fatigue load limit Cur is 360 kN." }, { "q": "What is the maximum speed of the SL192344-TB-BR?", "a": "The limiting speed is 910 r/min and the thermal reference speed is 520 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192344-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192344", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192344-TB-BR", "SL192344-TB-BR" ], "locale_variants": {} }, { "sku": "SL182948", "brand": "FAG", "manufacturer_designation": "SL182948", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 600, "static_load_kN": 1120, "fatigue_load_limit_kN": 132, "limiting_speed_rpm": 1120, "max_rpm": 1120, "reference_speed_rpm": 750, "weight_g": 10600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×320×48 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 600 kN and C0 1120 kN; with a C/C0 ratio of 0.54 the 48 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 132 kN, the limiting speed 1,120 r/min and the thermal reference speed 750 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.50 kN per millimetre of the 240 mm bore and 12.50 kN per millimetre of the 48 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 10.6 kg (10600 g) (0.69 g per mm² of the 320×48 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 240 mm bore this is among the largest catalogue sizes; the 1,120 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position High radial rigidity at 600 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 320 mm outside diameter and 600 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 240 mm seat, and in rope drums and winch drums the 10.6 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 48 mm width and the published 1120 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182948?", "a": "The SL182948 is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 320 mm outside diameter, 240 mm bore and 48 mm width, envelope 240×320×48 mm. Mass is 10.6 kg." }, { "q": "What does the SL182948 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182948 identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 240×320×48 mm and the catalogue ratings are C 600 kN, C0 1120 kN, Cur 132 kN." }, { "q": "What is the load capacity of the SL182948?", "a": "The basic dynamic load rating C is 600 kN and the basic static load rating C0 is 1120 kN; the fatigue load limit Cur is 132 kN." }, { "q": "What is the maximum speed of the SL182948?", "a": "The limiting speed is 1,120 r/min and the thermal reference speed is 750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182948?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182948", "SL182948" ], "locale_variants": {} }, { "sku": "SL183048", "brand": "FAG", "manufacturer_designation": "SL183048", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1210, "static_load_kN": 1990, "fatigue_load_limit_kN": 234, "limiting_speed_rpm": 1040, "max_rpm": 1040, "reference_speed_rpm": 720, "weight_g": 30900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×360×92 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1210 kN and C0 1990 kN; with a C/C0 ratio of 0.61 the 92 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 234 kN, the limiting speed 1,040 r/min and the thermal reference speed 720 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.04 kN per millimetre of the 240 mm bore and 13.15 kN per millimetre of the 92 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 30.9 kg (30900 g) (0.93 g per mm² of the 360×92 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 240 mm bore, 360 mm outside diameter: at this size the 1990 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 360 mm outside diameter and 1210 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 240 mm seat, and in material handling conveyor pulleys the 30.9 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 92 mm width and the published 1990 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL183048?", "a": "The SL183048 is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 360 mm outside diameter, 240 mm bore and 92 mm width, envelope 240×360×92 mm. Mass is 30.9 kg." }, { "q": "What does the SL183048 designation mean in the FAG/INA HR1 catalogue?", "a": "SL183048 identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 240×360×92 mm and the catalogue ratings are C 1210 kN, C0 1990 kN, Cur 234 kN." }, { "q": "What is the load capacity of the SL183048?", "a": "The basic dynamic load rating C is 1210 kN and the basic static load rating C0 is 1990 kN; the fatigue load limit Cur is 234 kN." }, { "q": "What is the maximum speed of the SL183048?", "a": "The limiting speed is 1,040 r/min and the thermal reference speed is 720 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183048?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183048", "SL183048" ], "locale_variants": {} }, { "sku": "SL192348-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192348-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 500, "B_mm": 155, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2900, "static_load_kN": 3800, "fatigue_load_limit_kN": 390, "limiting_speed_rpm": 860, "max_rpm": 860, "reference_speed_rpm": 500, "weight_g": 142300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×500×155 mm with a 130.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2900 kN and C0 3800 kN; with a C/C0 ratio of 0.76 the 155 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 390 kN, the limiting speed 860 r/min and the thermal reference speed 500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 12.08 kN per millimetre of the 240 mm bore and 18.71 kN per millimetre of the 155 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 142.3 kg (142300 g) (1.84 g per mm² of the 500×155 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 240 mm bore puts this execution at the top of the HR1 range — the 500 mm outside diameter, 155 mm width and 142.3 kg mass are built for primary-industry load cases Large SL1923 sizes in HR1 are typically the TB design with oxide-finished surfaces; the 142.3 kg mass reflects the thick, deformation-resistant rings At 860 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 2900 kN dynamic rating TB-design bearings use revised roller-end curvature to protect the ribs under combined load — relevant at 240 mm bore where the semi-locating function carries real thrust. The -BR coating is a handling and storage protection; once mounted and greased, the 500 mm bearing operates to its normal 860 r/min limit. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 500 mm outside diameter and 2900 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 240 mm seat, and in hydraulic pumps and radial piston pumps the 142.3 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 155 mm width and the published 3800 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192348-TB-BR?", "a": "The SL192348-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 500 mm outside diameter, 240 mm bore and 155 mm width, envelope 240×500×155 mm. Mass is 142.3 kg." }, { "q": "What does the SL192348-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192348-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 240×500×155 mm and the catalogue ratings are C 2900 kN, C0 3800 kN, Cur 390 kN." }, { "q": "What is the load capacity of the SL192348-TB-BR?", "a": "The basic dynamic load rating C is 2900 kN and the basic static load rating C0 is 3800 kN; the fatigue load limit Cur is 390 kN." }, { "q": "What is the maximum speed of the SL192348-TB-BR?", "a": "The limiting speed is 860 r/min and the thermal reference speed is 500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192348-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192348", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192348-TB-BR", "SL192348-TB-BR" ], "locale_variants": {} }, { "sku": "SL182952", "brand": "FAG", "manufacturer_designation": "SL182952", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 780, "static_load_kN": 1450, "fatigue_load_limit_kN": 168, "limiting_speed_rpm": 1020, "max_rpm": 1020, "reference_speed_rpm": 690, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 260×360×60 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 780 kN and C0 1450 kN; with a C/C0 ratio of 0.54 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 168 kN, the limiting speed 1,020 r/min and the thermal reference speed 690 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.00 kN per millimetre of the 260 mm bore and 13.00 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 18.5 kg (18500 g) (0.86 g per mm² of the 360×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 260 mm bore, 360 mm outside diameter: at this size the 1450 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 50.0 mm section height between the 260 mm bore and the 360 mm outside diameter The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 360 mm outside diameter and 780 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 260 mm seat, and in rope drums and winch drums the 18.5 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 60 mm width and the published 1450 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182952?", "a": "The SL182952 is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 360 mm outside diameter, 260 mm bore and 60 mm width, envelope 260×360×60 mm. Mass is 18.5 kg." }, { "q": "What does the SL182952 designation mean in the FAG/INA HR1 catalogue?", "a": "SL182952 identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 260×360×60 mm and the catalogue ratings are C 780 kN, C0 1450 kN, Cur 168 kN." }, { "q": "What is the load capacity of the SL182952?", "a": "The basic dynamic load rating C is 780 kN and the basic static load rating C0 is 1450 kN; the fatigue load limit Cur is 168 kN." }, { "q": "What is the maximum speed of the SL182952?", "a": "The limiting speed is 1,020 r/min and the thermal reference speed is 690 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182952?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182952", "SL182952" ], "locale_variants": {} }, { "sku": "SL183052-TB", "brand": "FAG", "manufacturer_designation": "SL183052-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1600, "static_load_kN": 2500, "fatigue_load_limit_kN": 290, "limiting_speed_rpm": 940, "max_rpm": 940, "reference_speed_rpm": 620, "weight_g": 44500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 260×400×104 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1600 kN and C0 2500 kN; with a C/C0 ratio of 0.64 the 104 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 290 kN, the limiting speed 940 r/min and the thermal reference speed 620 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.15 kN per millimetre of the 260 mm bore and 15.38 kN per millimetre of the 104 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 44.5 kg (44500 g) (1.07 g per mm² of the 400×104 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 260 mm bore puts this execution at the top of the HR1 range — the 400 mm outside diameter, 104 mm width and 44.5 kg mass are built for primary-industry load cases The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 70.0 mm section height between the 260 mm bore and the 400 mm outside diameter SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly The -TB feature concerns the rib contact, not the envelope: the 260×400×104 mm dimensions and 44.5 kg mass follow the standard series plan. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 400 mm outside diameter and 1600 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 260 mm seat, and in hydraulic pumps and radial piston pumps the 44.5 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 104 mm width and the published 2500 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL183052-TB?", "a": "The SL183052-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 400 mm outside diameter, 260 mm bore and 104 mm width, envelope 260×400×104 mm. Mass is 44.5 kg." }, { "q": "What does the SL183052-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183052-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 260×400×104 mm and the catalogue ratings are C 1600 kN, C0 2500 kN, Cur 290 kN." }, { "q": "What is the load capacity of the SL183052-TB?", "a": "The basic dynamic load rating C is 1600 kN and the basic static load rating C0 is 2500 kN; the fatigue load limit Cur is 290 kN." }, { "q": "What is the maximum speed of the SL183052-TB?", "a": "The limiting speed is 940 r/min and the thermal reference speed is 620 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183052-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183052-TB", "SL183052-TB" ], "locale_variants": {} }, { "sku": "SL192352-TB-BR", "brand": "FAG", "manufacturer_designation": "SL192352-TB-BR", "series": "sl1923-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 540, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3550, "static_load_kN": 4700, "fatigue_load_limit_kN": 465, "limiting_speed_rpm": 760, "max_rpm": 760, "reference_speed_rpm": 410, "weight_g": 173200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 260×540×165 mm with a 140.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 3550 kN and C0 4700 kN; with a C/C0 ratio of 0.76 the 165 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 465 kN, the limiting speed 760 r/min and the thermal reference speed 410 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 13.65 kN per millimetre of the 260 mm bore and 21.52 kN per millimetre of the 165 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 173.2 kg (173200 g) (1.94 g per mm² of the 540×165 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 260 mm bore, 540 mm outside diameter: at this size the 4700 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading SL1923: full-complement roller set, no cage, self-guided rollers; the wide envelope is chosen where a narrow-section bearing would fit radially but lacks load capacity At 760 r/min limiting speed the SL1923 is a slow-speed, high-load bearing — the cageless rollers trade kinematic speed for the 3550 kN dynamic rating -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. -BR marks the oxide-treated execution: the thin black conversion coating protects the 3550 kN-rated bearing before it enters lubricated service. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 540 mm outside diameter and 3550 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 260 mm seat, and in vibrating and oscillating machinery the 173.2 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 165 mm width and the published 4700 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL192352-TB-BR?", "a": "The SL192352-TB-BR is a SL1923 single-row full-complement semi-locating cylindrical roller bearing with 540 mm outside diameter, 260 mm bore and 165 mm width, envelope 260×540×165 mm. Mass is 173.2 kg." }, { "q": "What does the SL192352-TB-BR designation mean in the FAG/INA HR1 catalogue?", "a": "SL192352-TB-BR identifies this SL1923 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 260×540×165 mm and the catalogue ratings are C 3550 kN, C0 4700 kN, Cur 465 kN." }, { "q": "What is the load capacity of the SL192352-TB-BR?", "a": "The basic dynamic load rating C is 3550 kN and the basic static load rating C0 is 4700 kN; the fatigue load limit Cur is 465 kN." }, { "q": "What is the maximum speed of the SL192352-TB-BR?", "a": "The limiting speed is 760 r/min and the thermal reference speed is 410 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL192352-TB-BR?", "a": "This is a semi-locating bearing: it locates the shaft in one axial direction and floats in the other, and should be paired with a non-locating or locating bearing accordingly." } ], "cross_ref": [ { "equiv_sku": "SL192352", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL192352-TB-BR", "SL192352-TB-BR" ], "locale_variants": {} }, { "sku": "SL182956-TB", "brand": "FAG", "manufacturer_designation": "SL182956-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 910, "static_load_kN": 1710, "fatigue_load_limit_kN": 193, "limiting_speed_rpm": 940, "max_rpm": 940, "reference_speed_rpm": 590, "weight_g": 19700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 280×380×60 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 910 kN and C0 1710 kN; with a C/C0 ratio of 0.53 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 193 kN, the limiting speed 940 r/min and the thermal reference speed 590 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.25 kN per millimetre of the 280 mm bore and 15.17 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 19.7 kg (19700 g) (0.86 g per mm² of the 380×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 280 mm bore puts this execution at the top of the HR1 range — the 380 mm outside diameter, 60 mm width and 19.7 kg mass are built for primary-industry load cases The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion SL182956-TB is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs TB-design bearings use revised roller-end curvature to protect the ribs under combined load — relevant at 280 mm bore where the semi-locating function carries real thrust. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 380 mm outside diameter and 910 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 280 mm seat, and in marine and offshore winch arrangements the 19.7 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 60 mm width and the published 1710 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182956-TB?", "a": "The SL182956-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 380 mm outside diameter, 280 mm bore and 60 mm width, envelope 280×380×60 mm. Mass is 19.7 kg." }, { "q": "What does the SL182956-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182956-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 280×380×60 mm and the catalogue ratings are C 910 kN, C0 1710 kN, Cur 193 kN." }, { "q": "What is the load capacity of the SL182956-TB?", "a": "The basic dynamic load rating C is 910 kN and the basic static load rating C0 is 1710 kN; the fatigue load limit Cur is 193 kN." }, { "q": "What is the maximum speed of the SL182956-TB?", "a": "The limiting speed is 940 r/min and the thermal reference speed is 590 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182956-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182956-TB", "SL182956-TB" ], "locale_variants": {} }, { "sku": "SL183056-TB", "brand": "FAG", "manufacturer_designation": "SL183056-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1650, "static_load_kN": 2650, "fatigue_load_limit_kN": 300, "limiting_speed_rpm": 900, "max_rpm": 900, "reference_speed_rpm": 590, "weight_g": 48000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 280×420×106 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1650 kN and C0 2650 kN; with a C/C0 ratio of 0.62 the 106 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 300 kN, the limiting speed 900 r/min and the thermal reference speed 590 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.89 kN per millimetre of the 280 mm bore and 15.57 kN per millimetre of the 106 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 48 kg (48000 g) (1.08 g per mm² of the 420×106 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 280 mm bore puts this execution at the top of the HR1 range — the 420 mm outside diameter, 106 mm width and 48 kg mass are built for primary-industry load cases SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly In the 420 mm envelope the cageless pack raises C0 to 2650 kN; the trade is the 900 r/min limiting speed, set by roller-to-roller sliding rather than by a cage TB-design bearings use revised roller-end curvature to protect the ribs under combined load — relevant at 280 mm bore where the semi-locating function carries real thrust. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 420 mm outside diameter and 1650 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 280 mm seat, and in compact slow-speed agitator drives the 48 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 106 mm width and the published 2650 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL183056-TB?", "a": "The SL183056-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 420 mm outside diameter, 280 mm bore and 106 mm width, envelope 280×420×106 mm. Mass is 48 kg." }, { "q": "What does the SL183056-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183056-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 280×420×106 mm and the catalogue ratings are C 1650 kN, C0 2650 kN, Cur 300 kN." }, { "q": "What is the load capacity of the SL183056-TB?", "a": "The basic dynamic load rating C is 1650 kN and the basic static load rating C0 is 2650 kN; the fatigue load limit Cur is 300 kN." }, { "q": "What is the maximum speed of the SL183056-TB?", "a": "The limiting speed is 900 r/min and the thermal reference speed is 590 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183056-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183056-TB", "SL183056-TB" ], "locale_variants": {} }, { "sku": "SL182960-TB", "brand": "FAG", "manufacturer_designation": "SL182960-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1170, "static_load_kN": 2200, "fatigue_load_limit_kN": 246, "limiting_speed_rpm": 870, "max_rpm": 870, "reference_speed_rpm": 540, "weight_g": 31200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 300×420×72 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1170 kN and C0 2200 kN; with a C/C0 ratio of 0.53 the 72 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 246 kN, the limiting speed 870 r/min and the thermal reference speed 540 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.90 kN per millimetre of the 300 mm bore and 16.25 kN per millimetre of the 72 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 31.2 kg (31200 g) (1.03 g per mm² of the 420×72 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 300 mm bore this is among the largest catalogue sizes; the 870 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1170 kN C. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 420 mm outside diameter and 1170 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 300 mm seat, and in vibrating and oscillating machinery the 31.2 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 72 mm width and the published 2200 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL182960-TB?", "a": "The SL182960-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 420 mm outside diameter, 300 mm bore and 72 mm width, envelope 300×420×72 mm. Mass is 31.2 kg." }, { "q": "What does the SL182960-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182960-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 300×420×72 mm and the catalogue ratings are C 1170 kN, C0 2200 kN, Cur 246 kN." }, { "q": "What is the load capacity of the SL182960-TB?", "a": "The basic dynamic load rating C is 1170 kN and the basic static load rating C0 is 2200 kN; the fatigue load limit Cur is 246 kN." }, { "q": "What is the maximum speed of the SL182960-TB?", "a": "The limiting speed is 870 r/min and the thermal reference speed is 540 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182960-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182960-TB", "SL182960-TB" ], "locale_variants": {} }, { "sku": "SL183060-TB", "brand": "FAG", "manufacturer_designation": "SL183060-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2020, "static_load_kN": 3300, "fatigue_load_limit_kN": 335, "limiting_speed_rpm": 800, "max_rpm": 800, "reference_speed_rpm": 500, "weight_g": 66600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 300×460×118 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2020 kN and C0 3300 kN; with a C/C0 ratio of 0.61 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 335 kN, the limiting speed 800 r/min and the thermal reference speed 500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.73 kN per millimetre of the 300 mm bore and 17.12 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 66.6 kg (66600 g) (1.23 g per mm² of the 460×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 300 mm bore puts this execution at the top of the HR1 range — the 460 mm outside diameter, 118 mm width and 66.6 kg mass are built for primary-industry load cases High radial rigidity at 2020 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value The -TB suffix denotes the increased axial-load design: profiled roller ends and optimised rib contact geometry lower edge stress and friction at the guide ribs. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 460 mm outside diameter and 2020 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 300 mm seat, and in crane travelling-wheel mechanisms the 66.6 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 118 mm width and the published 3300 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL183060-TB?", "a": "The SL183060-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 460 mm outside diameter, 300 mm bore and 118 mm width, envelope 300×460×118 mm. Mass is 66.6 kg." }, { "q": "What does the SL183060-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183060-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 300×460×118 mm and the catalogue ratings are C 2020 kN, C0 3300 kN, Cur 335 kN." }, { "q": "What is the load capacity of the SL183060-TB?", "a": "The basic dynamic load rating C is 2020 kN and the basic static load rating C0 is 3300 kN; the fatigue load limit Cur is 335 kN." }, { "q": "What is the maximum speed of the SL183060-TB?", "a": "The limiting speed is 800 r/min and the thermal reference speed is 500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183060-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183060", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183060-TB", "SL183060-TB" ], "locale_variants": {} }, { "sku": "SL182964-TB", "brand": "FAG", "manufacturer_designation": "SL182964-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1210, "static_load_kN": 2340, "fatigue_load_limit_kN": 260, "limiting_speed_rpm": 820, "max_rpm": 820, "reference_speed_rpm": 495, "weight_g": 32900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 320×440×72 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1210 kN and C0 2340 kN; with a C/C0 ratio of 0.52 the 72 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 260 kN, the limiting speed 820 r/min and the thermal reference speed 495 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.78 kN per millimetre of the 320 mm bore and 16.81 kN per millimetre of the 72 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 32.9 kg (32900 g) (1.04 g per mm² of the 440×72 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 320 mm bore this is among the largest catalogue sizes; the 820 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 60.0 mm section height between the 320 mm bore and the 440 mm outside diameter High radial rigidity at 1210 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery TB-design bearings use revised roller-end curvature to protect the ribs under combined load — relevant at 320 mm bore where the semi-locating function carries real thrust. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 440 mm outside diameter and 1210 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 320 mm seat, and in crane travelling-wheel mechanisms the 32.9 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 72 mm width and the published 2340 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182964-TB?", "a": "The SL182964-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 440 mm outside diameter, 320 mm bore and 72 mm width, envelope 320×440×72 mm. Mass is 32.9 kg." }, { "q": "What does the SL182964-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182964-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 320×440×72 mm and the catalogue ratings are C 1210 kN, C0 2340 kN, Cur 260 kN." }, { "q": "What is the load capacity of the SL182964-TB?", "a": "The basic dynamic load rating C is 1210 kN and the basic static load rating C0 is 2340 kN; the fatigue load limit Cur is 260 kN." }, { "q": "What is the maximum speed of the SL182964-TB?", "a": "The limiting speed is 820 r/min and the thermal reference speed is 495 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182964-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182964", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182964-TB", "SL182964-TB" ], "locale_variants": {} }, { "sku": "SL183064-TB", "brand": "FAG", "manufacturer_designation": "SL183064-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2080, "static_load_kN": 3450, "fatigue_load_limit_kN": 350, "limiting_speed_rpm": 770, "max_rpm": 770, "reference_speed_rpm": 480, "weight_g": 71700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 320×480×121 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2080 kN and C0 3450 kN; with a C/C0 ratio of 0.60 the 121 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 350 kN, the limiting speed 770 r/min and the thermal reference speed 480 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.50 kN per millimetre of the 320 mm bore and 17.19 kN per millimetre of the 121 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 71.7 kg (71700 g) (1.23 g per mm² of the 480×121 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 320 mm bore puts this execution at the top of the HR1 range — the 480 mm outside diameter, 121 mm width and 71.7 kg mass are built for primary-industry load cases The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly TB-design bearings use revised roller-end curvature to protect the ribs under combined load — relevant at 320 mm bore where the semi-locating function carries real thrust. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 480 mm outside diameter and 2080 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 320 mm seat, and in hydraulic pumps and radial piston pumps the 71.7 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 121 mm width and the published 3450 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL183064-TB?", "a": "The SL183064-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 480 mm outside diameter, 320 mm bore and 121 mm width, envelope 320×480×121 mm. Mass is 71.7 kg." }, { "q": "What does the SL183064-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183064-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 320×480×121 mm and the catalogue ratings are C 2080 kN, C0 3450 kN, Cur 350 kN." }, { "q": "What is the load capacity of the SL183064-TB?", "a": "The basic dynamic load rating C is 2080 kN and the basic static load rating C0 is 3450 kN; the fatigue load limit Cur is 350 kN." }, { "q": "What is the maximum speed of the SL183064-TB?", "a": "The limiting speed is 770 r/min and the thermal reference speed is 480 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183064-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183064", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183064-TB", "SL183064-TB" ], "locale_variants": {} }, { "sku": "SL182968-TB", "brand": "FAG", "manufacturer_designation": "SL182968-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1250, "static_load_kN": 2470, "fatigue_load_limit_kN": 270, "limiting_speed_rpm": 770, "max_rpm": 770, "reference_speed_rpm": 460, "weight_g": 34700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 340×460×72 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1250 kN and C0 2470 kN; with a C/C0 ratio of 0.51 the 72 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 270 kN, the limiting speed 770 r/min and the thermal reference speed 460 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.68 kN per millimetre of the 340 mm bore and 17.36 kN per millimetre of the 72 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 34.7 kg (34700 g) (1.05 g per mm² of the 460×72 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 340 mm bore puts this execution at the top of the HR1 range — the 460 mm outside diameter, 72 mm width and 34.7 kg mass are built for primary-industry load cases The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 60.0 mm section height between the 340 mm bore and the 460 mm outside diameter High radial rigidity at 1250 kN C is the point of this design: rib-guided rollers in a cageless pack resist deflection in planetary gears, rope drums and vibrating machinery -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 460 mm outside diameter and 1250 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 340 mm seat, and in marine and offshore winch arrangements the 34.7 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 72 mm width and the published 2470 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL182968-TB?", "a": "The SL182968-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 460 mm outside diameter, 340 mm bore and 72 mm width, envelope 340×460×72 mm. Mass is 34.7 kg." }, { "q": "What does the SL182968-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182968-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 340×460×72 mm and the catalogue ratings are C 1250 kN, C0 2470 kN, Cur 270 kN." }, { "q": "What is the load capacity of the SL182968-TB?", "a": "The basic dynamic load rating C is 1250 kN and the basic static load rating C0 is 2470 kN; the fatigue load limit Cur is 270 kN." }, { "q": "What is the maximum speed of the SL182968-TB?", "a": "The limiting speed is 770 r/min and the thermal reference speed is 460 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182968-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182968", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182968-TB", "SL182968-TB" ], "locale_variants": {} }, { "sku": "SL183068-TB", "brand": "FAG", "manufacturer_designation": "SL183068-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 520, "B_mm": 133, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2490, "static_load_kN": 4150, "fatigue_load_limit_kN": 405, "limiting_speed_rpm": 710, "max_rpm": 710, "reference_speed_rpm": 430, "weight_g": 95800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 340×520×133 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2490 kN and C0 4150 kN; with a C/C0 ratio of 0.60 the 133 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 405 kN, the limiting speed 710 r/min and the thermal reference speed 430 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.32 kN per millimetre of the 340 mm bore and 18.72 kN per millimetre of the 133 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 95.8 kg (95800 g) (1.39 g per mm² of the 520×133 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 340 mm bore, 520 mm outside diameter: at this size the 4150 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs In the 520 mm envelope the cageless pack raises C0 to 4150 kN; the trade is the 710 r/min limiting speed, set by roller-to-roller sliding rather than by a cage SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 2490 kN C. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 520 mm outside diameter and 2490 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 340 mm seat, and in vibrating and oscillating machinery the 95.8 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 133 mm width and the published 4150 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL183068-TB?", "a": "The SL183068-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 520 mm outside diameter, 340 mm bore and 133 mm width, envelope 340×520×133 mm. Mass is 95.8 kg." }, { "q": "What does the SL183068-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183068-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 340×520×133 mm and the catalogue ratings are C 2490 kN, C0 4150 kN, Cur 405 kN." }, { "q": "What is the load capacity of the SL183068-TB?", "a": "The basic dynamic load rating C is 2490 kN and the basic static load rating C0 is 4150 kN; the fatigue load limit Cur is 405 kN." }, { "q": "What is the maximum speed of the SL183068-TB?", "a": "The limiting speed is 710 r/min and the thermal reference speed is 430 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183068-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183068", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183068-TB", "SL183068-TB" ], "locale_variants": {} }, { "sku": "SL182972-TB", "brand": "FAG", "manufacturer_designation": "SL182972-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1280, "static_load_kN": 2600, "fatigue_load_limit_kN": 280, "limiting_speed_rpm": 730, "max_rpm": 730, "reference_speed_rpm": 430, "weight_g": 36400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 360×480×72 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1280 kN and C0 2600 kN; with a C/C0 ratio of 0.49 the 72 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 280 kN, the limiting speed 730 r/min and the thermal reference speed 430 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.56 kN per millimetre of the 360 mm bore and 17.78 kN per millimetre of the 72 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 36.4 kg (36400 g) (1.05 g per mm² of the 480×72 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 360 mm bore this is among the largest catalogue sizes; the 730 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1280 kN C. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 480 mm outside diameter and 1280 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 360 mm seat, and in rolling-mill and steel-industry drives the 36.4 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 72 mm width and the published 2600 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182972-TB?", "a": "The SL182972-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 480 mm outside diameter, 360 mm bore and 72 mm width, envelope 360×480×72 mm. Mass is 36.4 kg." }, { "q": "What does the SL182972-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182972-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 360×480×72 mm and the catalogue ratings are C 1280 kN, C0 2600 kN, Cur 280 kN." }, { "q": "What is the load capacity of the SL182972-TB?", "a": "The basic dynamic load rating C is 1280 kN and the basic static load rating C0 is 2600 kN; the fatigue load limit Cur is 280 kN." }, { "q": "What is the maximum speed of the SL182972-TB?", "a": "The limiting speed is 730 r/min and the thermal reference speed is 430 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182972-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182972", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182972-TB", "SL182972-TB" ], "locale_variants": {} }, { "sku": "SL183072-TB", "brand": "FAG", "manufacturer_designation": "SL183072-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 540, "B_mm": 134, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2550, "static_load_kN": 4350, "fatigue_load_limit_kN": 420, "limiting_speed_rpm": 680, "max_rpm": 680, "reference_speed_rpm": 405, "weight_g": 101000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 360×540×134 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2550 kN and C0 4350 kN; with a C/C0 ratio of 0.59 the 134 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 420 kN, the limiting speed 680 r/min and the thermal reference speed 405 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.08 kN per millimetre of the 360 mm bore and 19.03 kN per millimetre of the 134 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 101 kg (101000 g) (1.40 g per mm² of the 540×134 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 360 mm bore puts this execution at the top of the HR1 range — the 540 mm outside diameter, 134 mm width and 101 kg mass are built for primary-industry load cases SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion The -TB feature concerns the rib contact, not the envelope: the 360×540×134 mm dimensions and 101 kg mass follow the standard series plan. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 540 mm outside diameter and 2550 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 360 mm seat, and in crane travelling-wheel mechanisms the 101 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 134 mm width and the published 4350 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL183072-TB?", "a": "The SL183072-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 540 mm outside diameter, 360 mm bore and 134 mm width, envelope 360×540×134 mm. Mass is 101 kg." }, { "q": "What does the SL183072-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183072-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 360×540×134 mm and the catalogue ratings are C 2550 kN, C0 4350 kN, Cur 420 kN." }, { "q": "What is the load capacity of the SL183072-TB?", "a": "The basic dynamic load rating C is 2550 kN and the basic static load rating C0 is 4350 kN; the fatigue load limit Cur is 420 kN." }, { "q": "What is the maximum speed of the SL183072-TB?", "a": "The limiting speed is 680 r/min and the thermal reference speed is 405 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183072-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=525", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183072-TB", "SL183072-TB" ], "locale_variants": {} }, { "sku": "SL182976-TB", "brand": "FAG", "manufacturer_designation": "SL182976-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1660, "static_load_kN": 3300, "fatigue_load_limit_kN": 345, "limiting_speed_rpm": 680, "max_rpm": 680, "reference_speed_rpm": 380, "weight_g": 52100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 380×520×82 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1660 kN and C0 3300 kN; with a C/C0 ratio of 0.50 the 82 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 345 kN, the limiting speed 680 r/min and the thermal reference speed 380 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.37 kN per millimetre of the 380 mm bore and 20.24 kN per millimetre of the 82 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 52.1 kg (52100 g) (1.22 g per mm² of the 520×82 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 380 mm bore puts this execution at the top of the HR1 range — the 520 mm outside diameter, 82 mm width and 52.1 kg mass are built for primary-industry load cases SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value The -TB suffix denotes the increased axial-load design: profiled roller ends and optimised rib contact geometry lower edge stress and friction at the guide ribs. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 520 mm outside diameter and 1660 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 380 mm seat, and in compact slow-speed agitator drives the 52.1 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 82 mm width and the published 3300 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL182976-TB?", "a": "The SL182976-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 520 mm outside diameter, 380 mm bore and 82 mm width, envelope 380×520×82 mm. Mass is 52.1 kg." }, { "q": "What does the SL182976-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182976-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 380×520×82 mm and the catalogue ratings are C 1660 kN, C0 3300 kN, Cur 345 kN." }, { "q": "What is the load capacity of the SL182976-TB?", "a": "The basic dynamic load rating C is 1660 kN and the basic static load rating C0 is 3300 kN; the fatigue load limit Cur is 345 kN." }, { "q": "What is the maximum speed of the SL182976-TB?", "a": "The limiting speed is 680 r/min and the thermal reference speed is 380 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182976-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182976", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182976-TB", "SL182976-TB" ], "locale_variants": {} }, { "sku": "SL183076-TB", "brand": "FAG", "manufacturer_designation": "SL183076-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 135, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2600, "static_load_kN": 4450, "fatigue_load_limit_kN": 430, "limiting_speed_rpm": 660, "max_rpm": 660, "reference_speed_rpm": 390, "weight_g": 106000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 380×560×135 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2600 kN and C0 4450 kN; with a C/C0 ratio of 0.58 the 135 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 430 kN, the limiting speed 660 r/min and the thermal reference speed 390 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 6.84 kN per millimetre of the 380 mm bore and 19.26 kN per millimetre of the 135 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 106 kg (106000 g) (1.40 g per mm² of the 560×135 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 380 mm bore puts this execution at the top of the HR1 range — the 560 mm outside diameter, 135 mm width and 106 kg mass are built for primary-industry load cases SL18 bearings are separable for mounting: the inner ring with the self-retained roller set can be fitted separately from the plain-bored outer ring, which simplifies interference-fit assembly Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value The -TB feature concerns the rib contact, not the envelope: the 380×560×135 mm dimensions and 106 kg mass follow the standard series plan. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 560 mm outside diameter and 2600 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 380 mm seat, and in planetary gear bearing positions the 106 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 135 mm width and the published 4450 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL183076-TB?", "a": "The SL183076-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 560 mm outside diameter, 380 mm bore and 135 mm width, envelope 380×560×135 mm. Mass is 106 kg." }, { "q": "What does the SL183076-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183076-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 380×560×135 mm and the catalogue ratings are C 2600 kN, C0 4450 kN, Cur 430 kN." }, { "q": "What is the load capacity of the SL183076-TB?", "a": "The basic dynamic load rating C is 2600 kN and the basic static load rating C0 is 4450 kN; the fatigue load limit Cur is 430 kN." }, { "q": "What is the maximum speed of the SL183076-TB?", "a": "The limiting speed is 660 r/min and the thermal reference speed is 390 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183076-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183076", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183076-TB", "SL183076-TB" ], "locale_variants": {} }, { "sku": "SL182980-TB", "brand": "FAG", "manufacturer_designation": "SL182980-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1710, "static_load_kN": 3500, "fatigue_load_limit_kN": 360, "limiting_speed_rpm": 650, "max_rpm": 650, "reference_speed_rpm": 350, "weight_g": 54300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 400×540×82 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1710 kN and C0 3500 kN; with a C/C0 ratio of 0.49 the 82 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 360 kN, the limiting speed 650 r/min and the thermal reference speed 350 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.28 kN per millimetre of the 400 mm bore and 20.85 kN per millimetre of the 82 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 54.3 kg (54300 g) (1.23 g per mm² of the 540×82 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 400 mm bore this is among the largest catalogue sizes; the 650 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL182980-TB is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1710 kN C. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 540 mm outside diameter and 1710 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 400 mm seat, and in heavy industrial gearbox shafts the 54.3 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 82 mm width and the published 3500 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182980-TB?", "a": "The SL182980-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 540 mm outside diameter, 400 mm bore and 82 mm width, envelope 400×540×82 mm. Mass is 54.3 kg." }, { "q": "What does the SL182980-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182980-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 400×540×82 mm and the catalogue ratings are C 1710 kN, C0 3500 kN, Cur 360 kN." }, { "q": "What is the load capacity of the SL182980-TB?", "a": "The basic dynamic load rating C is 1710 kN and the basic static load rating C0 is 3500 kN; the fatigue load limit Cur is 360 kN." }, { "q": "What is the maximum speed of the SL182980-TB?", "a": "The limiting speed is 650 r/min and the thermal reference speed is 350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182980-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182980", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182980-TB", "SL182980-TB" ], "locale_variants": {} }, { "sku": "SL183080-TB", "brand": "FAG", "manufacturer_designation": "SL183080-TB", "series": "sl1830-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 600, "B_mm": 148, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3050, "static_load_kN": 5400, "fatigue_load_limit_kN": 520, "limiting_speed_rpm": 610, "max_rpm": 610, "reference_speed_rpm": 345, "weight_g": 140000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 400×600×148 mm with a 100.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 3050 kN and C0 5400 kN; with a C/C0 ratio of 0.56 the 148 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 520 kN, the limiting speed 610 r/min and the thermal reference speed 345 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.63 kN per millimetre of the 400 mm bore and 20.61 kN per millimetre of the 148 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 140 kg (140000 g) (1.58 g per mm² of the 600×148 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 400 mm bore puts this execution at the top of the HR1 range — the 600 mm outside diameter, 148 mm width and 140 kg mass are built for primary-industry load cases The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion In the 600 mm envelope the cageless pack raises C0 to 5400 kN; the trade is the 610 r/min limiting speed, set by roller-to-roller sliding rather than by a cage The -TB suffix denotes the increased axial-load design: profiled roller ends and optimised rib contact geometry lower edge stress and friction at the guide ribs. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 600 mm outside diameter and 3050 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 400 mm seat, and in rolling-mill and steel-industry drives the 140 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 148 mm width and the published 5400 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL183080-TB?", "a": "The SL183080-TB is a SL1830 single-row full-complement semi-locating cylindrical roller bearing with 600 mm outside diameter, 400 mm bore and 148 mm width, envelope 400×600×148 mm. Mass is 140 kg." }, { "q": "What does the SL183080-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL183080-TB identifies this SL1830 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 400×600×148 mm and the catalogue ratings are C 3050 kN, C0 5400 kN, Cur 520 kN." }, { "q": "What is the load capacity of the SL183080-TB?", "a": "The basic dynamic load rating C is 3050 kN and the basic static load rating C0 is 5400 kN; the fatigue load limit Cur is 520 kN." }, { "q": "What is the maximum speed of the SL183080-TB?", "a": "The limiting speed is 610 r/min and the thermal reference speed is 345 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL183080-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL183080", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL183080-TB", "SL183080-TB" ], "locale_variants": {} }, { "sku": "SL182984-TB", "brand": "FAG", "manufacturer_designation": "SL182984-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 420, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1730, "static_load_kN": 3600, "fatigue_load_limit_kN": 370, "limiting_speed_rpm": 630, "max_rpm": 630, "reference_speed_rpm": 340, "weight_g": 56900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 420×560×82 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1730 kN and C0 3600 kN; with a C/C0 ratio of 0.48 the 82 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 370 kN, the limiting speed 630 r/min and the thermal reference speed 340 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.12 kN per millimetre of the 420 mm bore and 21.10 kN per millimetre of the 82 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 56.9 kg (56900 g) (1.24 g per mm² of the 560×82 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 420 mm bore this is among the largest catalogue sizes; the 630 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 70.0 mm section height between the 420 mm bore and the 560 mm outside diameter Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1730 kN C. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 560 mm outside diameter and 1730 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 420 mm seat, and in rolling-mill and steel-industry drives the 56.9 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 82 mm width and the published 3600 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL182984-TB?", "a": "The SL182984-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 560 mm outside diameter, 420 mm bore and 82 mm width, envelope 420×560×82 mm. Mass is 56.9 kg." }, { "q": "What does the SL182984-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182984-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 420×560×82 mm and the catalogue ratings are C 1730 kN, C0 3600 kN, Cur 370 kN." }, { "q": "What is the load capacity of the SL182984-TB?", "a": "The basic dynamic load rating C is 1730 kN and the basic static load rating C0 is 3600 kN; the fatigue load limit Cur is 370 kN." }, { "q": "What is the maximum speed of the SL182984-TB?", "a": "The limiting speed is 630 r/min and the thermal reference speed is 340 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182984-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182984", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182984-TB", "SL182984-TB" ], "locale_variants": {} }, { "sku": "SL182988-TB", "brand": "FAG", "manufacturer_designation": "SL182988-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 440, "D_mm": 600, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2090, "static_load_kN": 4100, "fatigue_load_limit_kN": 420, "limiting_speed_rpm": 590, "max_rpm": 590, "reference_speed_rpm": 325, "weight_g": 78100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 440×600×95 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2090 kN and C0 4100 kN; with a C/C0 ratio of 0.51 the 95 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 420 kN, the limiting speed 590 r/min and the thermal reference speed 325 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.75 kN per millimetre of the 440 mm bore and 22.00 kN per millimetre of the 95 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 78.1 kg (78100 g) (1.37 g per mm² of the 600×95 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 440 mm bore puts this execution at the top of the HR1 range — the 600 mm outside diameter, 95 mm width and 78.1 kg mass are built for primary-industry load cases SL182988-TB is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The -TB feature concerns the rib contact, not the envelope: the 440×600×95 mm dimensions and 78.1 kg mass follow the standard series plan. Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 600 mm outside diameter and 2090 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 440 mm seat, and in compact slow-speed agitator drives the 78.1 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 95 mm width and the published 4100 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL182988-TB?", "a": "The SL182988-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 600 mm outside diameter, 440 mm bore and 95 mm width, envelope 440×600×95 mm. Mass is 78.1 kg." }, { "q": "What does the SL182988-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182988-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 440×600×95 mm and the catalogue ratings are C 2090 kN, C0 4100 kN, Cur 420 kN." }, { "q": "What is the load capacity of the SL182988-TB?", "a": "The basic dynamic load rating C is 2090 kN and the basic static load rating C0 is 4100 kN; the fatigue load limit Cur is 420 kN." }, { "q": "What is the maximum speed of the SL182988-TB?", "a": "The limiting speed is 590 r/min and the thermal reference speed is 325 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182988-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182988", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182988-TB", "SL182988-TB" ], "locale_variants": {} }, { "sku": "SL182992-TB", "brand": "FAG", "manufacturer_designation": "SL182992-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 620, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2130, "static_load_kN": 4250, "fatigue_load_limit_kN": 430, "limiting_speed_rpm": 570, "max_rpm": 570, "reference_speed_rpm": 310, "weight_g": 81100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 460×620×95 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2130 kN and C0 4250 kN; with a C/C0 ratio of 0.50 the 95 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 430 kN, the limiting speed 570 r/min and the thermal reference speed 310 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.63 kN per millimetre of the 460 mm bore and 22.42 kN per millimetre of the 95 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 81.1 kg (81100 g) (1.38 g per mm² of the 620×95 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 460 mm bore this is among the largest catalogue sizes; the 570 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 80.0 mm section height between the 460 mm bore and the 620 mm outside diameter Reading the designation: SL18 marks the Schaeffler full-complement semi-locating type with one rib on the outer ring and two ribs on the inner ring; the rollers are axially guided by the inner ring while the outer ring can displace by the catalogue s-value -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 620 mm outside diameter and 2130 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 460 mm seat, and in heavy industrial gearbox shafts the 81.1 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 95 mm width and the published 4250 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL182992-TB?", "a": "The SL182992-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 620 mm outside diameter, 460 mm bore and 95 mm width, envelope 460×620×95 mm. Mass is 81.1 kg." }, { "q": "What does the SL182992-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182992-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 460×620×95 mm and the catalogue ratings are C 2130 kN, C0 4250 kN, Cur 430 kN." }, { "q": "What is the load capacity of the SL182992-TB?", "a": "The basic dynamic load rating C is 2130 kN and the basic static load rating C0 is 4250 kN; the fatigue load limit Cur is 430 kN." }, { "q": "What is the maximum speed of the SL182992-TB?", "a": "The limiting speed is 570 r/min and the thermal reference speed is 310 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182992-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182992", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182992-TB", "SL182992-TB" ], "locale_variants": {} }, { "sku": "SL182996-TB", "brand": "FAG", "manufacturer_designation": "SL182996-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 480, "D_mm": 650, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2390, "static_load_kN": 4800, "fatigue_load_limit_kN": 480, "limiting_speed_rpm": 530, "max_rpm": 530, "reference_speed_rpm": 280, "weight_g": 94700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 480×650×100 mm with a 85.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2390 kN and C0 4800 kN; with a C/C0 ratio of 0.50 the 100 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 480 kN, the limiting speed 530 r/min and the thermal reference speed 280 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.98 kN per millimetre of the 480 mm bore and 23.90 kN per millimetre of the 100 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 94.7 kg (94700 g) (1.46 g per mm² of the 650×100 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 480 mm bore puts this execution at the top of the HR1 range — the 650 mm outside diameter, 100 mm width and 94.7 kg mass are built for primary-industry load cases The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion The dimension-series digits place this bearing in the SL18 section of the HR1 plan, giving the 85.0 mm section height between the 480 mm bore and the 650 mm outside diameter The -TB suffix denotes the increased axial-load design: profiled roller ends and optimised rib contact geometry lower edge stress and friction at the guide ribs. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 650 mm outside diameter and 2390 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 480 mm seat, and in hydraulic pumps and radial piston pumps the 94.7 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 100 mm width and the published 4800 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL182996-TB?", "a": "The SL182996-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 650 mm outside diameter, 480 mm bore and 100 mm width, envelope 480×650×100 mm. Mass is 94.7 kg." }, { "q": "What does the SL182996-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL182996-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 480×650×100 mm and the catalogue ratings are C 2390 kN, C0 4800 kN, Cur 480 kN." }, { "q": "What is the load capacity of the SL182996-TB?", "a": "The basic dynamic load rating C is 2390 kN and the basic static load rating C0 is 4800 kN; the fatigue load limit Cur is 480 kN." }, { "q": "What is the maximum speed of the SL182996-TB?", "a": "The limiting speed is 530 r/min and the thermal reference speed is 280 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL182996-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL182996", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL182996-TB", "SL182996-TB" ], "locale_variants": {} }, { "sku": "SL1829-500-TB", "brand": "FAG", "manufacturer_designation": "SL1829/500-TB", "series": "sl1829-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 670, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2430, "static_load_kN": 4950, "fatigue_load_limit_kN": 490, "limiting_speed_rpm": 520, "max_rpm": 520, "reference_speed_rpm": 270, "weight_g": 98300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 500×670×100 mm with a 85.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2430 kN and C0 4950 kN; with a C/C0 ratio of 0.49 the 100 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 490 kN, the limiting speed 520 r/min and the thermal reference speed 270 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.86 kN per millimetre of the 500 mm bore and 24.30 kN per millimetre of the 100 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 98.3 kg (98300 g) (1.47 g per mm² of the 670×100 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 500 mm bore puts this execution at the top of the HR1 range — the 670 mm outside diameter, 100 mm width and 98.3 kg mass are built for primary-industry load cases SL1829/500-TB is a single-row full-complement cylindrical roller bearing: no cage is fitted, so the maximum number of rollers runs between the rings, and the rollers guide themselves on the two inner-ring ribs The semi-locating function means this bearing locates the shaft in one axial direction and floats in the other — useful in two-bearing shafts where one position is fixed and the other absorbs expansion Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 2430 kN C. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 670 mm outside diameter and 2430 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 500 mm seat, and in marine and offshore winch arrangements the 98.3 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 100 mm width and the published 4950 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL1829/500-TB?", "a": "The SL1829/500-TB is a SL1829 single-row full-complement semi-locating cylindrical roller bearing with 670 mm outside diameter, 500 mm bore and 100 mm width, envelope 500×670×100 mm. Mass is 98.3 kg." }, { "q": "What does the SL1829/500-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL1829/500-TB identifies this SL1829 single-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 500×670×100 mm and the catalogue ratings are C 2430 kN, C0 4950 kN, Cur 490 kN." }, { "q": "What is the load capacity of the SL1829/500-TB?", "a": "The basic dynamic load rating C is 2430 kN and the basic static load rating C0 is 4950 kN; the fatigue load limit Cur is 490 kN." }, { "q": "What is the maximum speed of the SL1829/500-TB?", "a": "The limiting speed is 520 r/min and the thermal reference speed is 270 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL1829/500-TB?", "a": "This is a semi-locating bearing: one rib on the outer ring and two on the inner ring guide the shaft axially in one direction, while the other direction is free for thermal expansion." } ], "cross_ref": [ { "equiv_sku": "SL1829", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=527", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL1829-500-TB", "SL1829/500-TB" ], "locale_variants": {} }, { "sku": "SL185004-XL", "brand": "FAG", "manufacturer_designation": "SL185004-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 42, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 53, "static_load_kN": 52, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 11400, "max_rpm": 11400, "reference_speed_rpm": 7400, "weight_g": 200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×42×30 mm with a 11.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 53 kN and C0 52 kN; with a C/C0 ratio of 1.02 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 9.1 kN, the limiting speed 11,400 r/min and the thermal reference speed 7,400 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.65 kN per millimetre of the 20 mm bore and 1.77 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 200 g (0.16 g per mm² of the 42×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement Two cageless roller rows inside the 42×30 mm envelope give C 53 kN and C0 52 kN — among the highest radial capacities available at the 20 mm bore X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 52 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 42 mm outside diameter and 53 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 20 mm seat, and in crane travelling-wheel mechanisms the 200 g mass suits the compact, space-optimised housing. Designers also specify it for vibrating and oscillating machinery, relying on the 30 mm width and the published 52 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL185004-XL?", "a": "The SL185004-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 42 mm outside diameter, 20 mm bore and 30 mm width, envelope 20×42×30 mm. Mass is 200 g." }, { "q": "What does the SL185004-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185004-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×42×30 mm and the catalogue ratings are C 53 kN, C0 52 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the SL185004-XL?", "a": "The basic dynamic load rating C is 53 kN and the basic static load rating C0 is 52 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the SL185004-XL?", "a": "The limiting speed is 11,400 r/min and the thermal reference speed is 7,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185004-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185004-XL", "SL185004-XL" ], "locale_variants": {} }, { "sku": "SL185005-XL", "brand": "FAG", "manufacturer_designation": "SL185005-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 60, "static_load_kN": 64, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 9500, "max_rpm": 9500, "reference_speed_rpm": 6000, "weight_g": 230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×47×30 mm with a 11.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 60 kN and C0 64 kN; with a C/C0 ratio of 0.94 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 11.3 kN, the limiting speed 9,500 r/min and the thermal reference speed 6,000 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.40 kN per millimetre of the 25 mm bore and 2.00 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 230 g (0.16 g per mm² of the 47×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes Two cageless roller rows inside the 47×30 mm envelope give C 60 kN and C0 64 kN — among the highest radial capacities available at the 25 mm bore X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 64 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 47 mm outside diameter and 60 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 25 mm seat, and in rope drums and winch drums the 230 g mass suits the compact, space-optimised housing. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 30 mm width and the published 64 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL185005-XL?", "a": "The SL185005-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 47 mm outside diameter, 25 mm bore and 30 mm width, envelope 25×47×30 mm. Mass is 230 g." }, { "q": "What does the SL185005-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185005-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×47×30 mm and the catalogue ratings are C 60 kN, C0 64 kN, Cur 11.3 kN." }, { "q": "What is the load capacity of the SL185005-XL?", "a": "The basic dynamic load rating C is 60 kN and the basic static load rating C0 is 64 kN; the fatigue load limit Cur is 11.3 kN." }, { "q": "What is the maximum speed of the SL185005-XL?", "a": "The limiting speed is 9,500 r/min and the thermal reference speed is 6,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185005-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185005-XL", "SL185005-XL" ], "locale_variants": {} }, { "sku": "SL185006-XL", "brand": "FAG", "manufacturer_designation": "SL185006-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 78, "static_load_kN": 84, "fatigue_load_limit_kN": 15.2, "limiting_speed_rpm": 8100, "max_rpm": 8100, "reference_speed_rpm": 5300, "weight_g": 350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×55×34 mm with a 12.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 78 kN and C0 84 kN; with a C/C0 ratio of 0.93 the 34 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 15.2 kN, the limiting speed 8,100 r/min and the thermal reference speed 5,300 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.60 kN per millimetre of the 30 mm bore and 2.29 kN per millimetre of the 34 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 350 g (0.19 g per mm² of the 55×34 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes Full-complement kinematics cap the speed at 8,100 r/min (reference 5,300 r/min); below that limit the double-row pack offers exceptional stiffness for its section X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 84 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 55 mm outside diameter and 78 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 30 mm seat, and in rolling-mill and steel-industry drives the 350 g mass suits the compact, space-optimised housing. Designers also specify it for construction machinery slewing drives, relying on the 34 mm width and the published 84 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL185006-XL?", "a": "The SL185006-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 55 mm outside diameter, 30 mm bore and 34 mm width, envelope 30×55×34 mm. Mass is 350 g." }, { "q": "What does the SL185006-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185006-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×55×34 mm and the catalogue ratings are C 78 kN, C0 84 kN, Cur 15.2 kN." }, { "q": "What is the load capacity of the SL185006-XL?", "a": "The basic dynamic load rating C is 78 kN and the basic static load rating C0 is 84 kN; the fatigue load limit Cur is 15.2 kN." }, { "q": "What is the maximum speed of the SL185006-XL?", "a": "The limiting speed is 8,100 r/min and the thermal reference speed is 5,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185006-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185006-XL", "SL185006-XL" ], "locale_variants": {} }, { "sku": "SL185007-XL", "brand": "FAG", "manufacturer_designation": "SL185007-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 94, "static_load_kN": 107, "fatigue_load_limit_kN": 19.2, "limiting_speed_rpm": 7100, "max_rpm": 7100, "reference_speed_rpm": 4750, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×62×36 mm with a 13.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 94 kN and C0 107 kN; with a C/C0 ratio of 0.88 the 36 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 19.2 kN, the limiting speed 7,100 r/min and the thermal reference speed 4,750 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.69 kN per millimetre of the 35 mm bore and 2.61 kN per millimetre of the 36 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 460 g (0.21 g per mm² of the 62×36 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 35 mm bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 35 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other Two cageless roller rows inside the 62×36 mm envelope give C 94 kN and C0 107 kN — among the highest radial capacities available at the 35 mm bore As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 19.2 kN Cur value. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 62 mm outside diameter and 94 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 35 mm seat, and in vibrating and oscillating machinery the 460 g mass suits the compact, space-optimised housing. Designers also specify it for marine and offshore winch arrangements, relying on the 36 mm width and the published 107 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL185007-XL?", "a": "The SL185007-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 62 mm outside diameter, 35 mm bore and 36 mm width, envelope 35×62×36 mm. Mass is 460 g." }, { "q": "What does the SL185007-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185007-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×62×36 mm and the catalogue ratings are C 94 kN, C0 107 kN, Cur 19.2 kN." }, { "q": "What is the load capacity of the SL185007-XL?", "a": "The basic dynamic load rating C is 94 kN and the basic static load rating C0 is 107 kN; the fatigue load limit Cur is 19.2 kN." }, { "q": "What is the maximum speed of the SL185007-XL?", "a": "The limiting speed is 7,100 r/min and the thermal reference speed is 4,750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185007-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185007-XL", "SL185007-XL" ], "locale_variants": {} }, { "sku": "SL185008-XL", "brand": "FAG", "manufacturer_designation": "SL185008-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 113, "static_load_kN": 133, "fatigue_load_limit_kN": 22.8, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 4200, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×68×38 mm with a 14.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 113 kN and C0 133 kN; with a C/C0 ratio of 0.85 the 38 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 22.8 kN, the limiting speed 6,300 r/min and the thermal reference speed 4,200 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.83 kN per millimetre of the 40 mm bore and 2.97 kN per millimetre of the 38 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 560 g (0.22 g per mm² of the 68×38 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 40 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 40 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other Full-complement kinematics cap the speed at 6,300 r/min (reference 4,200 r/min); below that limit the double-row pack offers exceptional stiffness for its section As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 22.8 kN Cur value. Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 68 mm outside diameter and 113 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 40 mm seat, and in hydraulic pumps and radial piston pumps the 560 g mass suits the compact, space-optimised housing. Designers also specify it for material handling conveyor pulleys, relying on the 38 mm width and the published 133 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL185008-XL?", "a": "The SL185008-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 68 mm outside diameter, 40 mm bore and 38 mm width, envelope 40×68×38 mm. Mass is 560 g." }, { "q": "What does the SL185008-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185008-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×68×38 mm and the catalogue ratings are C 113 kN, C0 133 kN, Cur 22.8 kN." }, { "q": "What is the load capacity of the SL185008-XL?", "a": "The basic dynamic load rating C is 113 kN and the basic static load rating C0 is 133 kN; the fatigue load limit Cur is 22.8 kN." }, { "q": "What is the maximum speed of the SL185008-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 4,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185008-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185008-XL", "SL185008-XL" ], "locale_variants": {} }, { "sku": "SL185009-XL", "brand": "FAG", "manufacturer_designation": "SL185009-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 120, "static_load_kN": 148, "fatigue_load_limit_kN": 25.5, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3950, "weight_g": 710, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×75×40 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 120 kN and C0 148 kN; with a C/C0 ratio of 0.81 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 25.5 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,950 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.67 kN per millimetre of the 45 mm bore and 3.00 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 710 g (0.24 g per mm² of the 75×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 45 mm bore marks the medium range: mounting forces and fits become critical, and the 710 g mass calls for proper induction or press tooling rather than hand fitting At 710 g, this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 25.5 kN Cur value. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 75 mm outside diameter and 120 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 45 mm seat, and in material handling conveyor pulleys the 710 g mass suits the compact, space-optimised housing. Designers also specify it for planetary gear bearing positions, relying on the 40 mm width and the published 148 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL185009-XL?", "a": "The SL185009-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 75 mm outside diameter, 45 mm bore and 40 mm width, envelope 45×75×40 mm. Mass is 710 g." }, { "q": "What does the SL185009-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185009-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×75×40 mm and the catalogue ratings are C 120 kN, C0 148 kN, Cur 25.5 kN." }, { "q": "What is the load capacity of the SL185009-XL?", "a": "The basic dynamic load rating C is 120 kN and the basic static load rating C0 is 148 kN; the fatigue load limit Cur is 25.5 kN." }, { "q": "What is the maximum speed of the SL185009-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185009-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185009-XL", "SL185009-XL" ], "locale_variants": {} }, { "sku": "SL185010-XL", "brand": "FAG", "manufacturer_designation": "SL185010-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 151, "static_load_kN": 188, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 5300, "max_rpm": 5300, "reference_speed_rpm": 3450, "weight_g": 760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×80×40 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 151 kN and C0 188 kN; with a C/C0 ratio of 0.80 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 30.5 kN, the limiting speed 5,300 r/min and the thermal reference speed 3,450 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.02 kN per millimetre of the 50 mm bore and 3.77 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 760 g (0.24 g per mm² of the 80×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 50 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 40 mm width as a standard mounting space Full-complement kinematics cap the speed at 5,300 r/min (reference 3,450 r/min); below that limit the double-row pack offers exceptional stiffness for its section The semi-locating SL1850 structure uses inner-ring ribs with a retaining ring on the flangeless side; it carries high radial loads plus axial load in one direction, which is why it often pairs with an SL0149 locating bearing The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 5,300 r/min limit. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 80 mm outside diameter and 151 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 50 mm seat, and in construction machinery slewing drives the 760 g mass suits the compact, space-optimised housing. Designers also specify it for compact slow-speed agitator drives, relying on the 40 mm width and the published 188 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL185010-XL?", "a": "The SL185010-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 80 mm outside diameter, 50 mm bore and 40 mm width, envelope 50×80×40 mm. Mass is 760 g." }, { "q": "What does the SL185010-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185010-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×80×40 mm and the catalogue ratings are C 151 kN, C0 188 kN, Cur 30.5 kN." }, { "q": "What is the load capacity of the SL185010-XL?", "a": "The basic dynamic load rating C is 151 kN and the basic static load rating C0 is 188 kN; the fatigue load limit Cur is 30.5 kN." }, { "q": "What is the maximum speed of the SL185010-XL?", "a": "The limiting speed is 5,300 r/min and the thermal reference speed is 3,450 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185010-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185010-XL", "SL185010-XL" ], "locale_variants": {} }, { "sku": "SL185011-XL", "brand": "FAG", "manufacturer_designation": "SL185011-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 206, "static_load_kN": 275, "fatigue_load_limit_kN": 46, "limiting_speed_rpm": 4550, "max_rpm": 4550, "reference_speed_rpm": 2900, "weight_g": 1160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×90×46 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 206 kN and C0 275 kN; with a C/C0 ratio of 0.75 the 46 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 46 kN, the limiting speed 4,550 r/min and the thermal reference speed 2,900 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.75 kN per millimetre of the 55 mm bore and 4.48 kN per millimetre of the 46 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.16 kg (1160 g) (0.28 g per mm² of the 90×46 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 55 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 46 mm width as a standard mounting space At 1.16 kg (1160 g), this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,550 r/min limit. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 90 mm outside diameter and 206 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 55 mm seat, and in crane travelling-wheel mechanisms the 1.16 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 46 mm width and the published 275 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL185011-XL?", "a": "The SL185011-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 90 mm outside diameter, 55 mm bore and 46 mm width, envelope 55×90×46 mm. Mass is 1.16 kg." }, { "q": "What does the SL185011-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185011-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×90×46 mm and the catalogue ratings are C 206 kN, C0 275 kN, Cur 46 kN." }, { "q": "What is the load capacity of the SL185011-XL?", "a": "The basic dynamic load rating C is 206 kN and the basic static load rating C0 is 275 kN; the fatigue load limit Cur is 46 kN." }, { "q": "What is the maximum speed of the SL185011-XL?", "a": "The limiting speed is 4,550 r/min and the thermal reference speed is 2,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185011-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185011-XL", "SL185011-XL" ], "locale_variants": {} }, { "sku": "SL014912", "brand": "FAG", "manufacturer_designation": "SL014912", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 70, "static_load_kN": 121, "fatigue_load_limit_kN": 17.7, "limiting_speed_rpm": 4650, "max_rpm": 4650, "reference_speed_rpm": 2650, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×85×25 mm with a 12.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 70 kN and C0 121 kN; with a C/C0 ratio of 0.58 the 25 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 17.7 kN, the limiting speed 4,650 r/min and the thermal reference speed 2,650 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.17 kN per millimetre of the 60 mm bore and 2.80 kN per millimetre of the 25 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 490 g (0.23 g per mm² of the 85×25 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 60 mm bore places this bearing in the medium band, where the 85 mm envelope already carries ratings in the tens of kilonewtons SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Reading SL0149: the DIN 5412-9 type code family NNC49, double-row full complement with split outer ring; the joining retaining rings must not be used to transmit axial force Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 85 mm outside diameter and 70 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 60 mm seat, and in compact slow-speed agitator drives the 490 g mass suits the compact, space-optimised housing. Designers also specify it for heavy industrial gearbox shafts, relying on the 25 mm width and the published 121 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL014912?", "a": "The SL014912 is a SL0149 double-row full-complement locating cylindrical roller bearing with 85 mm outside diameter, 60 mm bore and 25 mm width, envelope 60×85×25 mm. Mass is 490 g." }, { "q": "What does the SL014912 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014912 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 60×85×25 mm and the catalogue ratings are C 70 kN, C0 121 kN, Cur 17.7 kN." }, { "q": "What is the load capacity of the SL014912?", "a": "The basic dynamic load rating C is 70 kN and the basic static load rating C0 is 121 kN; the fatigue load limit Cur is 17.7 kN." }, { "q": "What is the maximum speed of the SL014912?", "a": "The limiting speed is 4,650 r/min and the thermal reference speed is 2,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014912?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014912", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014912", "SL014912" ], "locale_variants": {} }, { "sku": "SL024912", "brand": "FAG", "manufacturer_designation": "SL024912", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 70, "static_load_kN": 121, "fatigue_load_limit_kN": 17.7, "limiting_speed_rpm": 4650, "max_rpm": 4650, "reference_speed_rpm": 2650, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×85×25 mm with a 12.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 70 kN and C0 121 kN; with a C/C0 ratio of 0.58 the 25 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 17.7 kN, the limiting speed 4,650 r/min and the thermal reference speed 2,650 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.17 kN per millimetre of the 60 mm bore and 2.80 kN per millimetre of the 25 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 470 g (0.22 g per mm² of the 85×25 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 60 mm bore places this bearing in the medium band, where the 85 mm envelope already carries ratings in the tens of kilonewtons SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Reading SL0249: the DIN 5412-9 type code family NNCL49 — double row, no cage, flangeless outer ring; the open design is relubricated through groove and holes in the outer ring Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 85 mm outside diameter and 70 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 60 mm seat, and in crane travelling-wheel mechanisms the 470 g mass suits the compact, space-optimised housing. Designers also specify it for vibrating and oscillating machinery, relying on the 25 mm width and the published 121 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL024912?", "a": "The SL024912 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 85 mm outside diameter, 60 mm bore and 25 mm width, envelope 60×85×25 mm. Mass is 470 g." }, { "q": "What does the SL024912 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024912 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 60×85×25 mm and the catalogue ratings are C 70 kN, C0 121 kN, Cur 17.7 kN." }, { "q": "What is the load capacity of the SL024912?", "a": "The basic dynamic load rating C is 70 kN and the basic static load rating C0 is 121 kN; the fatigue load limit Cur is 17.7 kN." }, { "q": "What is the maximum speed of the SL024912?", "a": "The limiting speed is 4,650 r/min and the thermal reference speed is 2,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024912?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024912", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024912", "SL024912" ], "locale_variants": {} }, { "sku": "SL185012-XL", "brand": "FAG", "manufacturer_designation": "SL185012-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 212, "static_load_kN": 285, "fatigue_load_limit_kN": 48.5, "limiting_speed_rpm": 4350, "max_rpm": 4350, "reference_speed_rpm": 2800, "weight_g": 1240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×95×46 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 212 kN and C0 285 kN; with a C/C0 ratio of 0.74 the 46 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 48.5 kN, the limiting speed 4,350 r/min and the thermal reference speed 2,800 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.53 kN per millimetre of the 60 mm bore and 4.61 kN per millimetre of the 46 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.24 kg (1240 g) (0.28 g per mm² of the 95×46 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 60 mm bore places this bearing in the medium band, where the 95 mm envelope already carries ratings in the tens of kilonewtons Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes X-life status (-XL) indicates the current Schaeffler premium execution at 60 mm bore; the 285 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 95 mm outside diameter and 212 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 60 mm seat, and in rolling-mill and steel-industry drives the 1.24 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 46 mm width and the published 285 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL185012-XL?", "a": "The SL185012-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 95 mm outside diameter, 60 mm bore and 46 mm width, envelope 60×95×46 mm. Mass is 1.24 kg." }, { "q": "What does the SL185012-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185012-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×95×46 mm and the catalogue ratings are C 212 kN, C0 285 kN, Cur 48.5 kN." }, { "q": "What is the load capacity of the SL185012-XL?", "a": "The basic dynamic load rating C is 212 kN and the basic static load rating C0 is 285 kN; the fatigue load limit Cur is 48.5 kN." }, { "q": "What is the maximum speed of the SL185012-XL?", "a": "The limiting speed is 4,350 r/min and the thermal reference speed is 2,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185012-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185012-XL", "SL185012-XL" ], "locale_variants": {} }, { "sku": "SL185013-XL", "brand": "FAG", "manufacturer_designation": "SL185013-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 223, "static_load_kN": 315, "fatigue_load_limit_kN": 53, "limiting_speed_rpm": 4000, "max_rpm": 4000, "reference_speed_rpm": 2500, "weight_g": 1320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×100×46 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 223 kN and C0 315 kN; with a C/C0 ratio of 0.71 the 46 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 53 kN, the limiting speed 4,000 r/min and the thermal reference speed 2,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.43 kN per millimetre of the 65 mm bore and 4.85 kN per millimetre of the 46 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.32 kg (1320 g) (0.29 g per mm² of the 100×46 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 65 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 65 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other Two cageless roller rows inside the 100×46 mm envelope give C 223 kN and C0 315 kN — among the highest radial capacities available at the 65 mm bore X-life status (-XL) indicates the current Schaeffler premium execution at 65 mm bore; the 315 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 100 mm outside diameter and 223 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 65 mm seat, and in planetary gear bearing positions the 1.32 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 46 mm width and the published 315 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL185013-XL?", "a": "The SL185013-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 100 mm outside diameter, 65 mm bore and 46 mm width, envelope 65×100×46 mm. Mass is 1.32 kg." }, { "q": "What does the SL185013-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185013-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×100×46 mm and the catalogue ratings are C 223 kN, C0 315 kN, Cur 53 kN." }, { "q": "What is the load capacity of the SL185013-XL?", "a": "The basic dynamic load rating C is 223 kN and the basic static load rating C0 is 315 kN; the fatigue load limit Cur is 53 kN." }, { "q": "What is the maximum speed of the SL185013-XL?", "a": "The limiting speed is 4,000 r/min and the thermal reference speed is 2,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185013-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185013-XL", "SL185013-XL" ], "locale_variants": {} }, { "sku": "SL014914", "brand": "FAG", "manufacturer_designation": "SL014914", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 106, "static_load_kN": 185, "fatigue_load_limit_kN": 27.5, "limiting_speed_rpm": 3900, "max_rpm": 3900, "reference_speed_rpm": 2330, "weight_g": 780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×100×30 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 106 kN and C0 185 kN; with a C/C0 ratio of 0.57 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 27.5 kN, the limiting speed 3,900 r/min and the thermal reference speed 2,330 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.51 kN per millimetre of the 70 mm bore and 3.53 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 780 g (0.26 g per mm² of the 100×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 70 mm bore this is a heavy-industrial bearing: 780 g of stiff ring and roller set, specified where rigidity matters more than speed As the fixed (locating) bearing it takes the thermal-expansion thrust from the shaft while the paired floating bearing moves; the limiting speed here is 3,900 r/min No angular compensation is built in: misalignment loads one roller row preferentially, so the housing and shaft seats for a 70 mm bore SL0149 must be machined parallel Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 100 mm outside diameter and 106 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 70 mm seat, and in construction machinery slewing drives the 780 g mass suits the compact, space-optimised housing. Designers also specify it for compact slow-speed agitator drives, relying on the 30 mm width and the published 185 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL014914?", "a": "The SL014914 is a SL0149 double-row full-complement locating cylindrical roller bearing with 100 mm outside diameter, 70 mm bore and 30 mm width, envelope 70×100×30 mm. Mass is 780 g." }, { "q": "What does the SL014914 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014914 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 70×100×30 mm and the catalogue ratings are C 106 kN, C0 185 kN, Cur 27.5 kN." }, { "q": "What is the load capacity of the SL014914?", "a": "The basic dynamic load rating C is 106 kN and the basic static load rating C0 is 185 kN; the fatigue load limit Cur is 27.5 kN." }, { "q": "What is the maximum speed of the SL014914?", "a": "The limiting speed is 3,900 r/min and the thermal reference speed is 2,330 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014914?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014914", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014914", "SL014914" ], "locale_variants": {} }, { "sku": "SL024914", "brand": "FAG", "manufacturer_designation": "SL024914", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 106, "static_load_kN": 185, "fatigue_load_limit_kN": 27.5, "limiting_speed_rpm": 3900, "max_rpm": 3900, "reference_speed_rpm": 2330, "weight_g": 750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×100×30 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 106 kN and C0 185 kN; with a C/C0 ratio of 0.57 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 27.5 kN, the limiting speed 3,900 r/min and the thermal reference speed 2,330 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.51 kN per millimetre of the 70 mm bore and 3.53 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 750 g (0.25 g per mm² of the 100×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 70 mm bore this is a heavy-industrial bearing: 750 g of stiff ring and roller set, specified where rigidity matters more than speed Shaft and housing shoulders must still locate the rings themselves even though the bearing floats internally; the 15.0 mm section ring is too stiff to self-align SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 100 mm outside diameter and 106 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 70 mm seat, and in planetary gear bearing positions the 750 g mass suits the compact, space-optimised housing. Designers also specify it for crane travelling-wheel mechanisms, relying on the 30 mm width and the published 185 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL024914?", "a": "The SL024914 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 100 mm outside diameter, 70 mm bore and 30 mm width, envelope 70×100×30 mm. Mass is 750 g." }, { "q": "What does the SL024914 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024914 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 70×100×30 mm and the catalogue ratings are C 106 kN, C0 185 kN, Cur 27.5 kN." }, { "q": "What is the load capacity of the SL024914?", "a": "The basic dynamic load rating C is 106 kN and the basic static load rating C0 is 185 kN; the fatigue load limit Cur is 27.5 kN." }, { "q": "What is the maximum speed of the SL024914?", "a": "The limiting speed is 3,900 r/min and the thermal reference speed is 2,330 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024914?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024914", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024914", "SL024914" ], "locale_variants": {} }, { "sku": "SL185014-XL", "brand": "FAG", "manufacturer_designation": "SL185014-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 265, "static_load_kN": 350, "fatigue_load_limit_kN": 60, "limiting_speed_rpm": 3750, "max_rpm": 3750, "reference_speed_rpm": 2650, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×110×54 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 265 kN and C0 350 kN; with a C/C0 ratio of 0.76 the 54 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 60 kN, the limiting speed 3,750 r/min and the thermal reference speed 2,650 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.79 kN per millimetre of the 70 mm bore and 4.91 kN per millimetre of the 54 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.85 kg (1850 g) (0.31 g per mm² of the 110×54 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 70 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 70 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other X-life status (-XL) indicates the current Schaeffler premium execution at 70 mm bore; the 350 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 110 mm outside diameter and 265 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 70 mm seat, and in heavy industrial gearbox shafts the 1.85 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 54 mm width and the published 350 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL185014-XL?", "a": "The SL185014-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 110 mm outside diameter, 70 mm bore and 54 mm width, envelope 70×110×54 mm. Mass is 1.85 kg." }, { "q": "What does the SL185014-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185014-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×110×54 mm and the catalogue ratings are C 265 kN, C0 350 kN, Cur 60 kN." }, { "q": "What is the load capacity of the SL185014-XL?", "a": "The basic dynamic load rating C is 265 kN and the basic static load rating C0 is 350 kN; the fatigue load limit Cur is 60 kN." }, { "q": "What is the maximum speed of the SL185014-XL?", "a": "The limiting speed is 3,750 r/min and the thermal reference speed is 2,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185014-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185014-XL", "SL185014-XL" ], "locale_variants": {} }, { "sku": "SL185015-XL", "brand": "FAG", "manufacturer_designation": "SL185015-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 275, "static_load_kN": 385, "fatigue_load_limit_kN": 66, "limiting_speed_rpm": 3450, "max_rpm": 3450, "reference_speed_rpm": 2370, "weight_g": 1930, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×115×54 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 275 kN and C0 385 kN; with a C/C0 ratio of 0.71 the 54 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 66 kN, the limiting speed 3,450 r/min and the thermal reference speed 2,370 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.67 kN per millimetre of the 75 mm bore and 5.09 kN per millimetre of the 54 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.93 kg (1930 g) (0.31 g per mm² of the 115×54 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 75 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 66 kN Cur value. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 115 mm outside diameter and 275 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 75 mm seat, and in construction machinery slewing drives the 1.93 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 54 mm width and the published 385 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL185015-XL?", "a": "The SL185015-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 115 mm outside diameter, 75 mm bore and 54 mm width, envelope 75×115×54 mm. Mass is 1.93 kg." }, { "q": "What does the SL185015-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185015-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×115×54 mm and the catalogue ratings are C 275 kN, C0 385 kN, Cur 66 kN." }, { "q": "What is the load capacity of the SL185015-XL?", "a": "The basic dynamic load rating C is 275 kN and the basic static load rating C0 is 385 kN; the fatigue load limit Cur is 66 kN." }, { "q": "What is the maximum speed of the SL185015-XL?", "a": "The limiting speed is 3,450 r/min and the thermal reference speed is 2,370 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185015-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185015-XL", "SL185015-XL" ], "locale_variants": {} }, { "sku": "SL014916", "brand": "FAG", "manufacturer_designation": "SL014916", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 112, "static_load_kN": 206, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 3550, "max_rpm": 3550, "reference_speed_rpm": 2090, "weight_g": 880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×30 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 112 kN and C0 206 kN; with a C/C0 ratio of 0.54 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 30.5 kN, the limiting speed 3,550 r/min and the thermal reference speed 2,090 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.40 kN per millimetre of the 80 mm bore and 3.73 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 880 g (0.27 g per mm² of the 110×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 80 mm bore the 110 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,550 r/min The locating structure has an axially split outer ring with ribs on both sides, joined by retaining rings, and an inner ring with a centre rib — the 30 mm width houses two complete roller rows Inside the 80×110×30 mm envelope the two cageless rows provide C0 206 kN, the capacity this series is selected for in heavy gearbox and drum positions Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 110 mm outside diameter and 112 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 80 mm seat, and in rolling-mill and steel-industry drives the 880 g mass suits the compact, space-optimised housing. Designers also specify it for construction machinery slewing drives, relying on the 30 mm width and the published 206 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL014916?", "a": "The SL014916 is a SL0149 double-row full-complement locating cylindrical roller bearing with 110 mm outside diameter, 80 mm bore and 30 mm width, envelope 80×110×30 mm. Mass is 880 g." }, { "q": "What does the SL014916 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014916 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 80×110×30 mm and the catalogue ratings are C 112 kN, C0 206 kN, Cur 30.5 kN." }, { "q": "What is the load capacity of the SL014916?", "a": "The basic dynamic load rating C is 112 kN and the basic static load rating C0 is 206 kN; the fatigue load limit Cur is 30.5 kN." }, { "q": "What is the maximum speed of the SL014916?", "a": "The limiting speed is 3,550 r/min and the thermal reference speed is 2,090 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014916?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014916", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014916", "SL014916" ], "locale_variants": {} }, { "sku": "SL024916", "brand": "FAG", "manufacturer_designation": "SL024916", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 112, "static_load_kN": 206, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 3550, "max_rpm": 3550, "reference_speed_rpm": 2090, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×30 mm with a 15.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 112 kN and C0 206 kN; with a C/C0 ratio of 0.54 the 30 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 30.5 kN, the limiting speed 3,550 r/min and the thermal reference speed 2,090 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.40 kN per millimetre of the 80 mm bore and 3.73 kN per millimetre of the 30 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 850 g (0.26 g per mm² of the 110×30 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 80 mm bore the 110 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,550 r/min The non-locating structure has two inner rings with side ribs and a plain outer ring joined by retaining rings for handling; axial displacement of shaft relative to housing occurs inside the bearing without constraint Two full roller rows give C 112 kN and C0 206 kN in a 110 mm outside diameter — the classic floating position opposite an SL0149 locating bearing Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 110 mm outside diameter and 112 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 80 mm seat, and in material handling conveyor pulleys the 850 g mass suits the compact, space-optimised housing. Designers also specify it for planetary gear bearing positions, relying on the 30 mm width and the published 206 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL024916?", "a": "The SL024916 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 110 mm outside diameter, 80 mm bore and 30 mm width, envelope 80×110×30 mm. Mass is 850 g." }, { "q": "What does the SL024916 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024916 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 80×110×30 mm and the catalogue ratings are C 112 kN, C0 206 kN, Cur 30.5 kN." }, { "q": "What is the load capacity of the SL024916?", "a": "The basic dynamic load rating C is 112 kN and the basic static load rating C0 is 206 kN; the fatigue load limit Cur is 30.5 kN." }, { "q": "What is the maximum speed of the SL024916?", "a": "The limiting speed is 3,550 r/min and the thermal reference speed is 2,090 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024916?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024916", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024916", "SL024916" ], "locale_variants": {} }, { "sku": "SL185016-XL", "brand": "FAG", "manufacturer_designation": "SL185016-XL", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 330, "static_load_kN": 440, "fatigue_load_limit_kN": 83, "limiting_speed_rpm": 3200, "max_rpm": 3200, "reference_speed_rpm": 2320, "weight_g": 2590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×125×60 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 330 kN and C0 440 kN; with a C/C0 ratio of 0.75 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 83 kN, the limiting speed 3,200 r/min and the thermal reference speed 2,320 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.13 kN per millimetre of the 80 mm bore and 5.50 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.59 kg (2590 g) (0.35 g per mm² of the 125×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 80 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery At 2.59 kg (2590 g), this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 83 kN Cur value. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 125 mm outside diameter and 330 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 80 mm seat, and in crane travelling-wheel mechanisms the 2.59 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 60 mm width and the published 440 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL185016-XL?", "a": "The SL185016-XL is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 125 mm outside diameter, 80 mm bore and 60 mm width, envelope 80×125×60 mm. Mass is 2.59 kg." }, { "q": "What does the SL185016-XL designation mean in the FAG/INA HR1 catalogue?", "a": "SL185016-XL identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×125×60 mm and the catalogue ratings are C 330 kN, C0 440 kN, Cur 83 kN." }, { "q": "What is the load capacity of the SL185016-XL?", "a": "The basic dynamic load rating C is 330 kN and the basic static load rating C0 is 440 kN; the fatigue load limit Cur is 83 kN." }, { "q": "What is the maximum speed of the SL185016-XL?", "a": "The limiting speed is 3,200 r/min and the thermal reference speed is 2,320 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185016-XL?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185016-XL", "SL185016-XL" ], "locale_variants": {} }, { "sku": "SL185017", "brand": "FAG", "manufacturer_designation": "SL185017", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 300, "static_load_kN": 465, "fatigue_load_limit_kN": 70, "limiting_speed_rpm": 3050, "max_rpm": 3050, "reference_speed_rpm": 2210, "weight_g": 2720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×130×60 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 300 kN and C0 465 kN; with a C/C0 ratio of 0.65 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 70 kN, the limiting speed 3,050 r/min and the thermal reference speed 2,210 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.53 kN per millimetre of the 85 mm bore and 5.00 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.72 kg (2720 g) (0.35 g per mm² of the 130×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 85 mm bore the 130 mm outside diameter and 60 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,050 r/min Full-complement kinematics cap the speed at 3,050 r/min (reference 2,210 r/min); below that limit the double-row pack offers exceptional stiffness for its section Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 130 mm outside diameter and 300 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 85 mm seat, and in compact slow-speed agitator drives the 2.72 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 60 mm width and the published 465 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL185017?", "a": "The SL185017 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 130 mm outside diameter, 85 mm bore and 60 mm width, envelope 85×130×60 mm. Mass is 2.72 kg." }, { "q": "What does the SL185017 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185017 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 85×130×60 mm and the catalogue ratings are C 300 kN, C0 465 kN, Cur 70 kN." }, { "q": "What is the load capacity of the SL185017?", "a": "The basic dynamic load rating C is 300 kN and the basic static load rating C0 is 465 kN; the fatigue load limit Cur is 70 kN." }, { "q": "What is the maximum speed of the SL185017?", "a": "The limiting speed is 3,050 r/min and the thermal reference speed is 2,210 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185017?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185017", "SL185017" ], "locale_variants": {} }, { "sku": "SL014918", "brand": "FAG", "manufacturer_designation": "SL014918", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 125, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 153, "static_load_kN": 290, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3050, "max_rpm": 3050, "reference_speed_rpm": 1870, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×125×35 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 153 kN and C0 290 kN; with a C/C0 ratio of 0.53 the 35 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 39.5 kN, the limiting speed 3,050 r/min and the thermal reference speed 1,870 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.70 kN per millimetre of the 90 mm bore and 4.37 kN per millimetre of the 35 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.35 kg (1350 g) (0.31 g per mm² of the 125×35 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The outer ring carries an annular lubrication groove and holes, so the 153 kN dynamic rating can be maintained with relubrication without dismounting the 1.35 kg unit Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 125 mm outside diameter and 153 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 90 mm seat, and in marine and offshore winch arrangements the 1.35 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 35 mm width and the published 290 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL014918?", "a": "The SL014918 is a SL0149 double-row full-complement locating cylindrical roller bearing with 125 mm outside diameter, 90 mm bore and 35 mm width, envelope 90×125×35 mm. Mass is 1.35 kg." }, { "q": "What does the SL014918 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014918 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 90×125×35 mm and the catalogue ratings are C 153 kN, C0 290 kN, Cur 39.5 kN." }, { "q": "What is the load capacity of the SL014918?", "a": "The basic dynamic load rating C is 153 kN and the basic static load rating C0 is 290 kN; the fatigue load limit Cur is 39.5 kN." }, { "q": "What is the maximum speed of the SL014918?", "a": "The limiting speed is 3,050 r/min and the thermal reference speed is 1,870 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014918?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014918", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014918", "SL014918" ], "locale_variants": {} }, { "sku": "SL024918", "brand": "FAG", "manufacturer_designation": "SL024918", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 125, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 153, "static_load_kN": 290, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3050, "max_rpm": 3050, "reference_speed_rpm": 1870, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×125×35 mm with a 17.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 153 kN and C0 290 kN; with a C/C0 ratio of 0.53 the 35 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 39.5 kN, the limiting speed 3,050 r/min and the thermal reference speed 1,870 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.70 kN per millimetre of the 90 mm bore and 4.37 kN per millimetre of the 35 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.3 kg (1300 g) (0.30 g per mm² of the 125×35 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Two full roller rows give C 153 kN and C0 290 kN in a 125 mm outside diameter — the classic floating position opposite an SL0149 locating bearing Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 125 mm outside diameter and 153 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 90 mm seat, and in hydraulic pumps and radial piston pumps the 1.3 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 35 mm width and the published 290 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL024918?", "a": "The SL024918 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 125 mm outside diameter, 90 mm bore and 35 mm width, envelope 90×125×35 mm. Mass is 1.3 kg." }, { "q": "What does the SL024918 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024918 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 90×125×35 mm and the catalogue ratings are C 153 kN, C0 290 kN, Cur 39.5 kN." }, { "q": "What is the load capacity of the SL024918?", "a": "The basic dynamic load rating C is 153 kN and the basic static load rating C0 is 290 kN; the fatigue load limit Cur is 39.5 kN." }, { "q": "What is the maximum speed of the SL024918?", "a": "The limiting speed is 3,050 r/min and the thermal reference speed is 1,870 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024918?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024918", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024918", "SL024918" ], "locale_variants": {} }, { "sku": "SL185018", "brand": "FAG", "manufacturer_designation": "SL185018", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 350, "static_load_kN": 550, "fatigue_load_limit_kN": 82, "limiting_speed_rpm": 2850, "max_rpm": 2850, "reference_speed_rpm": 2140, "weight_g": 3620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×140×67 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 350 kN and C0 550 kN; with a C/C0 ratio of 0.64 the 67 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 82 kN, the limiting speed 2,850 r/min and the thermal reference speed 2,140 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.89 kN per millimetre of the 90 mm bore and 5.22 kN per millimetre of the 67 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.62 kg (3620 g) (0.39 g per mm² of the 140×67 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 90 mm bore this is a heavy-industrial bearing: 3.62 kg of stiff ring and roller set, specified where rigidity matters more than speed Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 140 mm outside diameter and 350 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 90 mm seat, and in planetary gear bearing positions the 3.62 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 67 mm width and the published 550 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL185018?", "a": "The SL185018 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 140 mm outside diameter, 90 mm bore and 67 mm width, envelope 90×140×67 mm. Mass is 3.62 kg." }, { "q": "What does the SL185018 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185018 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 90×140×67 mm and the catalogue ratings are C 350 kN, C0 550 kN, Cur 82 kN." }, { "q": "What is the load capacity of the SL185018?", "a": "The basic dynamic load rating C is 350 kN and the basic static load rating C0 is 550 kN; the fatigue load limit Cur is 82 kN." }, { "q": "What is the maximum speed of the SL185018?", "a": "The limiting speed is 2,850 r/min and the thermal reference speed is 2,140 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185018?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185018", "SL185018" ], "locale_variants": {} }, { "sku": "SL014920", "brand": "FAG", "manufacturer_designation": "SL014920", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 191, "static_load_kN": 370, "fatigue_load_limit_kN": 48.5, "limiting_speed_rpm": 2700, "max_rpm": 2700, "reference_speed_rpm": 1720, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×140×40 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 191 kN and C0 370 kN; with a C/C0 ratio of 0.52 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 48.5 kN, the limiting speed 2,700 r/min and the thermal reference speed 1,720 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.91 kN per millimetre of the 100 mm bore and 4.78 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.95 kg (1950 g) (0.35 g per mm² of the 140×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 100 mm bore this is a heavy-industrial bearing: 1.95 kg of stiff ring and roller set, specified where rigidity matters more than speed As the fixed (locating) bearing it takes the thermal-expansion thrust from the shaft while the paired floating bearing moves; the limiting speed here is 2,700 r/min Inside the 100×140×40 mm envelope the two cageless rows provide C0 370 kN, the capacity this series is selected for in heavy gearbox and drum positions Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 140 mm outside diameter and 191 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 100 mm seat, and in rolling-mill and steel-industry drives the 1.95 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 40 mm width and the published 370 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL014920?", "a": "The SL014920 is a SL0149 double-row full-complement locating cylindrical roller bearing with 140 mm outside diameter, 100 mm bore and 40 mm width, envelope 100×140×40 mm. Mass is 1.95 kg." }, { "q": "What does the SL014920 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014920 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 100×140×40 mm and the catalogue ratings are C 191 kN, C0 370 kN, Cur 48.5 kN." }, { "q": "What is the load capacity of the SL014920?", "a": "The basic dynamic load rating C is 191 kN and the basic static load rating C0 is 370 kN; the fatigue load limit Cur is 48.5 kN." }, { "q": "What is the maximum speed of the SL014920?", "a": "The limiting speed is 2,700 r/min and the thermal reference speed is 1,720 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014920?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014920", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014920", "SL014920" ], "locale_variants": {} }, { "sku": "SL024920", "brand": "FAG", "manufacturer_designation": "SL024920", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 191, "static_load_kN": 370, "fatigue_load_limit_kN": 48.5, "limiting_speed_rpm": 2700, "max_rpm": 2700, "reference_speed_rpm": 1720, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×140×40 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 191 kN and C0 370 kN; with a C/C0 ratio of 0.52 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 48.5 kN, the limiting speed 2,700 r/min and the thermal reference speed 1,720 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.91 kN per millimetre of the 100 mm bore and 4.78 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 1.9 kg (1900 g) (0.34 g per mm² of the 140×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 100 mm bore this is a heavy-industrial bearing: 1.9 kg of stiff ring and roller set, specified where rigidity matters more than speed Reading SL0249: the DIN 5412-9 type code family NNCL49 — double row, no cage, flangeless outer ring; the open design is relubricated through groove and holes in the outer ring The non-locating structure has two inner rings with side ribs and a plain outer ring joined by retaining rings for handling; axial displacement of shaft relative to housing occurs inside the bearing without constraint Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 140 mm outside diameter and 191 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 100 mm seat, and in material handling conveyor pulleys the 1.9 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 40 mm width and the published 370 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL024920?", "a": "The SL024920 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 140 mm outside diameter, 100 mm bore and 40 mm width, envelope 100×140×40 mm. Mass is 1.9 kg." }, { "q": "What does the SL024920 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024920 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 100×140×40 mm and the catalogue ratings are C 191 kN, C0 370 kN, Cur 48.5 kN." }, { "q": "What is the load capacity of the SL024920?", "a": "The basic dynamic load rating C is 191 kN and the basic static load rating C0 is 370 kN; the fatigue load limit Cur is 48.5 kN." }, { "q": "What is the maximum speed of the SL024920?", "a": "The limiting speed is 2,700 r/min and the thermal reference speed is 1,720 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024920?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024920", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024920", "SL024920" ], "locale_variants": {} }, { "sku": "SL185020", "brand": "FAG", "manufacturer_designation": "SL185020", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 370, "static_load_kN": 600, "fatigue_load_limit_kN": 87, "limiting_speed_rpm": 2600, "max_rpm": 2600, "reference_speed_rpm": 1930, "weight_g": 3940, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×150×67 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 370 kN and C0 600 kN; with a C/C0 ratio of 0.62 the 67 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 87 kN, the limiting speed 2,600 r/min and the thermal reference speed 1,930 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.70 kN per millimetre of the 100 mm bore and 5.52 kN per millimetre of the 67 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.94 kg (3940 g) (0.39 g per mm² of the 150×67 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 100 mm bore the 150 mm outside diameter and 67 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,600 r/min Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 150 mm outside diameter and 370 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 100 mm seat, and in crane travelling-wheel mechanisms the 3.94 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 67 mm width and the published 600 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL185020?", "a": "The SL185020 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 150 mm outside diameter, 100 mm bore and 67 mm width, envelope 100×150×67 mm. Mass is 3.94 kg." }, { "q": "What does the SL185020 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185020 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 100×150×67 mm and the catalogue ratings are C 370 kN, C0 600 kN, Cur 87 kN." }, { "q": "What is the load capacity of the SL185020?", "a": "The basic dynamic load rating C is 370 kN and the basic static load rating C0 is 600 kN; the fatigue load limit Cur is 87 kN." }, { "q": "What is the maximum speed of the SL185020?", "a": "The limiting speed is 2,600 r/min and the thermal reference speed is 1,930 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185020?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185020", "SL185020" ], "locale_variants": {} }, { "sku": "SL014922", "brand": "FAG", "manufacturer_designation": "SL014922", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 198, "static_load_kN": 400, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2500, "max_rpm": 2500, "reference_speed_rpm": 1600, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×150×40 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 198 kN and C0 400 kN; with a C/C0 ratio of 0.49 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 51 kN, the limiting speed 2,500 r/min and the thermal reference speed 1,600 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.80 kN per millimetre of the 110 mm bore and 4.95 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.15 kg (2150 g) (0.36 g per mm² of the 150×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 110 mm bore the 150 mm outside diameter and 40 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,500 r/min The locating structure has an axially split outer ring with ribs on both sides, joined by retaining rings, and an inner ring with a centre rib — the 40 mm width houses two complete roller rows The outer ring carries an annular lubrication groove and holes, so the 198 kN dynamic rating can be maintained with relubrication without dismounting the 2.15 kg unit Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 150 mm outside diameter and 198 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 110 mm seat, and in marine and offshore winch arrangements the 2.15 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 40 mm width and the published 400 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL014922?", "a": "The SL014922 is a SL0149 double-row full-complement locating cylindrical roller bearing with 150 mm outside diameter, 110 mm bore and 40 mm width, envelope 110×150×40 mm. Mass is 2.15 kg." }, { "q": "What does the SL014922 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014922 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 110×150×40 mm and the catalogue ratings are C 198 kN, C0 400 kN, Cur 51 kN." }, { "q": "What is the load capacity of the SL014922?", "a": "The basic dynamic load rating C is 198 kN and the basic static load rating C0 is 400 kN; the fatigue load limit Cur is 51 kN." }, { "q": "What is the maximum speed of the SL014922?", "a": "The limiting speed is 2,500 r/min and the thermal reference speed is 1,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014922?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014922", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014922", "SL014922" ], "locale_variants": {} }, { "sku": "SL024922", "brand": "FAG", "manufacturer_designation": "SL024922", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 198, "static_load_kN": 400, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 2500, "max_rpm": 2500, "reference_speed_rpm": 1600, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×150×40 mm with a 20.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 198 kN and C0 400 kN; with a C/C0 ratio of 0.49 the 40 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 51 kN, the limiting speed 2,500 r/min and the thermal reference speed 1,600 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.80 kN per millimetre of the 110 mm bore and 4.95 kN per millimetre of the 40 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.1 kg (2100 g) (0.35 g per mm² of the 150×40 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 110 mm bore the 150 mm outside diameter and 40 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 2,500 r/min At 110 mm bore and 2.1 kg, the SL0249 is specified in rolling-mill gearboxes, travelling mechanisms and construction machinery where thermal shaft growth must not induce thrust Reading SL0249: the DIN 5412-9 type code family NNCL49 — double row, no cage, flangeless outer ring; the open design is relubricated through groove and holes in the outer ring Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 150 mm outside diameter and 198 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 110 mm seat, and in hydraulic pumps and radial piston pumps the 2.1 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 40 mm width and the published 400 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL024922?", "a": "The SL024922 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 150 mm outside diameter, 110 mm bore and 40 mm width, envelope 110×150×40 mm. Mass is 2.1 kg." }, { "q": "What does the SL024922 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024922 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 110×150×40 mm and the catalogue ratings are C 198 kN, C0 400 kN, Cur 51 kN." }, { "q": "What is the load capacity of the SL024922?", "a": "The basic dynamic load rating C is 198 kN and the basic static load rating C0 is 400 kN; the fatigue load limit Cur is 51 kN." }, { "q": "What is the maximum speed of the SL024922?", "a": "The limiting speed is 2,500 r/min and the thermal reference speed is 1,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024922?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024922", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024922", "SL024922" ], "locale_variants": {} }, { "sku": "SL185022", "brand": "FAG", "manufacturer_designation": "SL185022", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 485, "static_load_kN": 770, "fatigue_load_limit_kN": 111, "limiting_speed_rpm": 2350, "max_rpm": 2350, "reference_speed_rpm": 1730, "weight_g": 6320, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×170×80 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 485 kN and C0 770 kN; with a C/C0 ratio of 0.63 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 111 kN, the limiting speed 2,350 r/min and the thermal reference speed 1,730 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.41 kN per millimetre of the 110 mm bore and 6.06 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.32 kg (6320 g) (0.46 g per mm² of the 170×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 110 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 110 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other At 6.32 kg (6320 g), this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 170 mm outside diameter and 485 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 110 mm seat, and in planetary gear bearing positions the 6.32 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 80 mm width and the published 770 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL185022?", "a": "The SL185022 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 170 mm outside diameter, 110 mm bore and 80 mm width, envelope 110×170×80 mm. Mass is 6.32 kg." }, { "q": "What does the SL185022 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185022 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 110×170×80 mm and the catalogue ratings are C 485 kN, C0 770 kN, Cur 111 kN." }, { "q": "What is the load capacity of the SL185022?", "a": "The basic dynamic load rating C is 485 kN and the basic static load rating C0 is 770 kN; the fatigue load limit Cur is 111 kN." }, { "q": "What is the maximum speed of the SL185022?", "a": "The limiting speed is 2,350 r/min and the thermal reference speed is 1,730 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185022?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185022", "SL185022" ], "locale_variants": {} }, { "sku": "SL014924", "brand": "FAG", "manufacturer_designation": "SL014924", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 222, "static_load_kN": 440, "fatigue_load_limit_kN": 56, "limiting_speed_rpm": 2260, "max_rpm": 2260, "reference_speed_rpm": 1540, "weight_g": 2950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×165×45 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 222 kN and C0 440 kN; with a C/C0 ratio of 0.50 the 45 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 56 kN, the limiting speed 2,260 r/min and the thermal reference speed 1,540 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.85 kN per millimetre of the 120 mm bore and 4.93 kN per millimetre of the 45 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.95 kg (2950 g) (0.40 g per mm² of the 165×45 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 120 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading SL0149: the DIN 5412-9 type code family NNC49, double-row full complement with split outer ring; the joining retaining rings must not be used to transmit axial force No angular compensation is built in: misalignment loads one roller row preferentially, so the housing and shaft seats for a 120 mm bore SL0149 must be machined parallel Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 165 mm outside diameter and 222 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 120 mm seat, and in vibrating and oscillating machinery the 2.95 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 45 mm width and the published 440 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL014924?", "a": "The SL014924 is a SL0149 double-row full-complement locating cylindrical roller bearing with 165 mm outside diameter, 120 mm bore and 45 mm width, envelope 120×165×45 mm. Mass is 2.95 kg." }, { "q": "What does the SL014924 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014924 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 120×165×45 mm and the catalogue ratings are C 222 kN, C0 440 kN, Cur 56 kN." }, { "q": "What is the load capacity of the SL014924?", "a": "The basic dynamic load rating C is 222 kN and the basic static load rating C0 is 440 kN; the fatigue load limit Cur is 56 kN." }, { "q": "What is the maximum speed of the SL014924?", "a": "The limiting speed is 2,260 r/min and the thermal reference speed is 1,540 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014924?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014924", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014924", "SL014924" ], "locale_variants": {} }, { "sku": "SL024924", "brand": "FAG", "manufacturer_designation": "SL024924", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 222, "static_load_kN": 440, "fatigue_load_limit_kN": 56, "limiting_speed_rpm": 2260, "max_rpm": 2260, "reference_speed_rpm": 1540, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×165×45 mm with a 22.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 222 kN and C0 440 kN; with a C/C0 ratio of 0.50 the 45 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 56 kN, the limiting speed 2,260 r/min and the thermal reference speed 1,540 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.85 kN per millimetre of the 120 mm bore and 4.93 kN per millimetre of the 45 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 2.85 kg (2850 g) (0.38 g per mm² of the 165×45 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 120 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The cageless double pack is speed-limited to 2,260 r/min (reference 1,540 r/min) but accepts purely radial loads with the rigidity required in heavy industrial gearboxes SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 165 mm outside diameter and 222 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 120 mm seat, and in rope drums and winch drums the 2.85 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 45 mm width and the published 440 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL024924?", "a": "The SL024924 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 165 mm outside diameter, 120 mm bore and 45 mm width, envelope 120×165×45 mm. Mass is 2.85 kg." }, { "q": "What does the SL024924 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024924 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 120×165×45 mm and the catalogue ratings are C 222 kN, C0 440 kN, Cur 56 kN." }, { "q": "What is the load capacity of the SL024924?", "a": "The basic dynamic load rating C is 222 kN and the basic static load rating C0 is 440 kN; the fatigue load limit Cur is 56 kN." }, { "q": "What is the maximum speed of the SL024924?", "a": "The limiting speed is 2,260 r/min and the thermal reference speed is 1,540 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024924?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024924", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024924", "SL024924" ], "locale_variants": {} }, { "sku": "SL185024", "brand": "FAG", "manufacturer_designation": "SL185024", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 510, "static_load_kN": 850, "fatigue_load_limit_kN": 119, "limiting_speed_rpm": 2160, "max_rpm": 2160, "reference_speed_rpm": 1530, "weight_g": 6770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×180×80 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 510 kN and C0 850 kN; with a C/C0 ratio of 0.60 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 119 kN, the limiting speed 2,160 r/min and the thermal reference speed 1,530 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.25 kN per millimetre of the 120 mm bore and 6.38 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.77 kg (6770 g) (0.47 g per mm² of the 180×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads with a 120 mm bore this is a heavy-industrial bearing: 6.77 kg of stiff ring and roller set, specified where rigidity matters more than speed Two cageless roller rows inside the 180×80 mm envelope give C 510 kN and C0 850 kN — among the highest radial capacities available at the 120 mm bore SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 120 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 180 mm outside diameter and 510 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 120 mm seat, and in material handling conveyor pulleys the 6.77 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 80 mm width and the published 850 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL185024?", "a": "The SL185024 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 180 mm outside diameter, 120 mm bore and 80 mm width, envelope 120×180×80 mm. Mass is 6.77 kg." }, { "q": "What does the SL185024 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185024 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 120×180×80 mm and the catalogue ratings are C 510 kN, C0 850 kN, Cur 119 kN." }, { "q": "What is the load capacity of the SL185024?", "a": "The basic dynamic load rating C is 510 kN and the basic static load rating C0 is 850 kN; the fatigue load limit Cur is 119 kN." }, { "q": "What is the maximum speed of the SL185024?", "a": "The limiting speed is 2,160 r/min and the thermal reference speed is 1,530 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185024?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=549", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185024", "SL185024" ], "locale_variants": {} }, { "sku": "SL014926", "brand": "FAG", "manufacturer_designation": "SL014926", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 260, "static_load_kN": 510, "fatigue_load_limit_kN": 64, "limiting_speed_rpm": 2090, "max_rpm": 2090, "reference_speed_rpm": 1500, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×180×50 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 260 kN and C0 510 kN; with a C/C0 ratio of 0.51 the 50 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 64 kN, the limiting speed 2,090 r/min and the thermal reference speed 1,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.00 kN per millimetre of the 130 mm bore and 5.20 kN per millimetre of the 50 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.95 kg (3950 g) (0.44 g per mm² of the 180×50 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 130 mm bore, 180 mm outside diameter: at this size the 510 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Inside the 130×180×50 mm envelope the two cageless rows provide C0 510 kN, the capacity this series is selected for in heavy gearbox and drum positions Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 180 mm outside diameter and 260 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 130 mm seat, and in crane travelling-wheel mechanisms the 3.95 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 50 mm width and the published 510 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL014926?", "a": "The SL014926 is a SL0149 double-row full-complement locating cylindrical roller bearing with 180 mm outside diameter, 130 mm bore and 50 mm width, envelope 130×180×50 mm. Mass is 3.95 kg." }, { "q": "What does the SL014926 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014926 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 130×180×50 mm and the catalogue ratings are C 260 kN, C0 510 kN, Cur 64 kN." }, { "q": "What is the load capacity of the SL014926?", "a": "The basic dynamic load rating C is 260 kN and the basic static load rating C0 is 510 kN; the fatigue load limit Cur is 64 kN." }, { "q": "What is the maximum speed of the SL014926?", "a": "The limiting speed is 2,090 r/min and the thermal reference speed is 1,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014926?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014926", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014926", "SL014926" ], "locale_variants": {} }, { "sku": "SL024926", "brand": "FAG", "manufacturer_designation": "SL024926", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 260, "static_load_kN": 510, "fatigue_load_limit_kN": 64, "limiting_speed_rpm": 2090, "max_rpm": 2090, "reference_speed_rpm": 1500, "weight_g": 3800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×180×50 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 260 kN and C0 510 kN; with a C/C0 ratio of 0.51 the 50 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 64 kN, the limiting speed 2,090 r/min and the thermal reference speed 1,500 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.00 kN per millimetre of the 130 mm bore and 5.20 kN per millimetre of the 50 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 3.8 kg (3800 g) (0.42 g per mm² of the 180×50 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 130 mm bore, 180 mm outside diameter: at this size the 510 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Two full roller rows give C 260 kN and C0 510 kN in a 180 mm outside diameter — the classic floating position opposite an SL0149 locating bearing Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 180 mm outside diameter and 260 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 130 mm seat, and in heavy industrial gearbox shafts the 3.8 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 50 mm width and the published 510 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL024926?", "a": "The SL024926 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 180 mm outside diameter, 130 mm bore and 50 mm width, envelope 130×180×50 mm. Mass is 3.8 kg." }, { "q": "What does the SL024926 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024926 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 130×180×50 mm and the catalogue ratings are C 260 kN, C0 510 kN, Cur 64 kN." }, { "q": "What is the load capacity of the SL024926?", "a": "The basic dynamic load rating C is 260 kN and the basic static load rating C0 is 510 kN; the fatigue load limit Cur is 64 kN." }, { "q": "What is the maximum speed of the SL024926?", "a": "The limiting speed is 2,090 r/min and the thermal reference speed is 1,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024926?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024926", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024926", "SL024926" ], "locale_variants": {} }, { "sku": "SL185026", "brand": "FAG", "manufacturer_designation": "SL185026", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 730, "static_load_kN": 1210, "fatigue_load_limit_kN": 167, "limiting_speed_rpm": 1990, "max_rpm": 1990, "reference_speed_rpm": 1340, "weight_g": 10200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×200×95 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 730 kN and C0 1210 kN; with a C/C0 ratio of 0.60 the 95 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 167 kN, the limiting speed 1,990 r/min and the thermal reference speed 1,340 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.62 kN per millimetre of the 130 mm bore and 7.68 kN per millimetre of the 95 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 10.2 kg (10200 g) (0.54 g per mm² of the 200×95 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 130 mm bore this is among the largest catalogue sizes; the 1,990 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position At 10.2 kg (10200 g), this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 200 mm outside diameter and 730 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 130 mm seat, and in hydraulic pumps and radial piston pumps the 10.2 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 95 mm width and the published 1210 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL185026?", "a": "The SL185026 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 200 mm outside diameter, 130 mm bore and 95 mm width, envelope 130×200×95 mm. Mass is 10.2 kg." }, { "q": "What does the SL185026 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185026 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 130×200×95 mm and the catalogue ratings are C 730 kN, C0 1210 kN, Cur 167 kN." }, { "q": "What is the load capacity of the SL185026?", "a": "The basic dynamic load rating C is 730 kN and the basic static load rating C0 is 1210 kN; the fatigue load limit Cur is 167 kN." }, { "q": "What is the maximum speed of the SL185026?", "a": "The limiting speed is 1,990 r/min and the thermal reference speed is 1,340 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185026?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185026", "SL185026" ], "locale_variants": {} }, { "sku": "SL014928", "brand": "FAG", "manufacturer_designation": "SL014928", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 270, "static_load_kN": 550, "fatigue_load_limit_kN": 67, "limiting_speed_rpm": 1950, "max_rpm": 1950, "reference_speed_rpm": 1370, "weight_g": 4200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×190×50 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 270 kN and C0 550 kN; with a C/C0 ratio of 0.49 the 50 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 67 kN, the limiting speed 1,950 r/min and the thermal reference speed 1,370 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.93 kN per millimetre of the 140 mm bore and 5.40 kN per millimetre of the 50 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 4.2 kg (4200 g) (0.44 g per mm² of the 190×50 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 140 mm bore this is among the largest catalogue sizes; the 1,950 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position No angular compensation is built in: misalignment loads one roller row preferentially, so the housing and shaft seats for a 140 mm bore SL0149 must be machined parallel SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 190 mm outside diameter and 270 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 140 mm seat, and in planetary gear bearing positions the 4.2 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 50 mm width and the published 550 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL014928?", "a": "The SL014928 is a SL0149 double-row full-complement locating cylindrical roller bearing with 190 mm outside diameter, 140 mm bore and 50 mm width, envelope 140×190×50 mm. Mass is 4.2 kg." }, { "q": "What does the SL014928 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014928 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 140×190×50 mm and the catalogue ratings are C 270 kN, C0 550 kN, Cur 67 kN." }, { "q": "What is the load capacity of the SL014928?", "a": "The basic dynamic load rating C is 270 kN and the basic static load rating C0 is 550 kN; the fatigue load limit Cur is 67 kN." }, { "q": "What is the maximum speed of the SL014928?", "a": "The limiting speed is 1,950 r/min and the thermal reference speed is 1,370 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014928?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014928", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014928", "SL014928" ], "locale_variants": {} }, { "sku": "SL024928", "brand": "FAG", "manufacturer_designation": "SL024928", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 270, "static_load_kN": 550, "fatigue_load_limit_kN": 67, "limiting_speed_rpm": 1950, "max_rpm": 1950, "reference_speed_rpm": 1370, "weight_g": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×190×50 mm with a 25.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 270 kN and C0 550 kN; with a C/C0 ratio of 0.49 the 50 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 67 kN, the limiting speed 1,950 r/min and the thermal reference speed 1,370 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 1.93 kN per millimetre of the 140 mm bore and 5.40 kN per millimetre of the 50 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 4.1 kg (4100 g) (0.43 g per mm² of the 190×50 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 140 mm bore this is among the largest catalogue sizes; the 1,950 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Shaft and housing shoulders must still locate the rings themselves even though the bearing floats internally; the 25.0 mm section ring is too stiff to self-align At 140 mm bore and 4.1 kg, the SL0249 is specified in rolling-mill gearboxes, travelling mechanisms and construction machinery where thermal shaft growth must not induce thrust Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 190 mm outside diameter and 270 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 140 mm seat, and in compact slow-speed agitator drives the 4.1 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 50 mm width and the published 550 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL024928?", "a": "The SL024928 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 190 mm outside diameter, 140 mm bore and 50 mm width, envelope 140×190×50 mm. Mass is 4.1 kg." }, { "q": "What does the SL024928 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024928 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 140×190×50 mm and the catalogue ratings are C 270 kN, C0 550 kN, Cur 67 kN." }, { "q": "What is the load capacity of the SL024928?", "a": "The basic dynamic load rating C is 270 kN and the basic static load rating C0 is 550 kN; the fatigue load limit Cur is 67 kN." }, { "q": "What is the maximum speed of the SL024928?", "a": "The limiting speed is 1,950 r/min and the thermal reference speed is 1,370 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024928?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024928", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024928", "SL024928" ], "locale_variants": {} }, { "sku": "SL185028", "brand": "FAG", "manufacturer_designation": "SL185028", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 770, "static_load_kN": 1330, "fatigue_load_limit_kN": 180, "limiting_speed_rpm": 1820, "max_rpm": 1820, "reference_speed_rpm": 1180, "weight_g": 11100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×210×95 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 770 kN and C0 1330 kN; with a C/C0 ratio of 0.58 the 95 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 180 kN, the limiting speed 1,820 r/min and the thermal reference speed 1,180 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.50 kN per millimetre of the 140 mm bore and 8.11 kN per millimetre of the 95 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 11.1 kg (11100 g) (0.56 g per mm² of the 210×95 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 140 mm bore puts this execution at the top of the HR1 range — the 210 mm outside diameter, 95 mm width and 11.1 kg mass are built for primary-industry load cases The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement The semi-locating SL1850 structure uses inner-ring ribs with a retaining ring on the flangeless side; it carries high radial loads plus axial load in one direction, which is why it often pairs with an SL0149 locating bearing Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 210 mm outside diameter and 770 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 140 mm seat, and in rope drums and winch drums the 11.1 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 95 mm width and the published 1330 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL185028?", "a": "The SL185028 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 210 mm outside diameter, 140 mm bore and 95 mm width, envelope 140×210×95 mm. Mass is 11.1 kg." }, { "q": "What does the SL185028 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185028 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 140×210×95 mm and the catalogue ratings are C 770 kN, C0 1330 kN, Cur 180 kN." }, { "q": "What is the load capacity of the SL185028?", "a": "The basic dynamic load rating C is 770 kN and the basic static load rating C0 is 1330 kN; the fatigue load limit Cur is 180 kN." }, { "q": "What is the maximum speed of the SL185028?", "a": "The limiting speed is 1,820 r/min and the thermal reference speed is 1,180 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185028?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185028", "SL185028" ], "locale_variants": {} }, { "sku": "SL014930", "brand": "FAG", "manufacturer_designation": "SL014930", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 410, "static_load_kN": 820, "fatigue_load_limit_kN": 106, "limiting_speed_rpm": 1790, "max_rpm": 1790, "reference_speed_rpm": 1200, "weight_g": 6650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×210×60 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 410 kN and C0 820 kN; with a C/C0 ratio of 0.50 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 106 kN, the limiting speed 1,790 r/min and the thermal reference speed 1,200 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.73 kN per millimetre of the 150 mm bore and 6.83 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.65 kg (6650 g) (0.53 g per mm² of the 210×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 150 mm bore puts this execution at the top of the HR1 range — the 210 mm outside diameter, 60 mm width and 6.65 kg mass are built for primary-industry load cases The outer ring carries an annular lubrication groove and holes, so the 410 kN dynamic rating can be maintained with relubrication without dismounting the 6.65 kg unit As the fixed (locating) bearing it takes the thermal-expansion thrust from the shaft while the paired floating bearing moves; the limiting speed here is 1,790 r/min Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 210 mm outside diameter and 410 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 150 mm seat, and in crane travelling-wheel mechanisms the 6.65 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 60 mm width and the published 820 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL014930?", "a": "The SL014930 is a SL0149 double-row full-complement locating cylindrical roller bearing with 210 mm outside diameter, 150 mm bore and 60 mm width, envelope 150×210×60 mm. Mass is 6.65 kg." }, { "q": "What does the SL014930 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014930 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 150×210×60 mm and the catalogue ratings are C 410 kN, C0 820 kN, Cur 106 kN." }, { "q": "What is the load capacity of the SL014930?", "a": "The basic dynamic load rating C is 410 kN and the basic static load rating C0 is 820 kN; the fatigue load limit Cur is 106 kN." }, { "q": "What is the maximum speed of the SL014930?", "a": "The limiting speed is 1,790 r/min and the thermal reference speed is 1,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014930?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014930", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014930", "SL014930" ], "locale_variants": {} }, { "sku": "SL024930", "brand": "FAG", "manufacturer_designation": "SL024930", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 410, "static_load_kN": 820, "fatigue_load_limit_kN": 106, "limiting_speed_rpm": 1790, "max_rpm": 1790, "reference_speed_rpm": 1200, "weight_g": 6450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×210×60 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 410 kN and C0 820 kN; with a C/C0 ratio of 0.50 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 106 kN, the limiting speed 1,790 r/min and the thermal reference speed 1,200 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.73 kN per millimetre of the 150 mm bore and 6.83 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.45 kg (6450 g) (0.51 g per mm² of the 210×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 150 mm bore puts this execution at the top of the HR1 range — the 210 mm outside diameter, 60 mm width and 6.45 kg mass are built for primary-industry load cases Two full roller rows give C 410 kN and C0 820 kN in a 210 mm outside diameter — the classic floating position opposite an SL0149 locating bearing The non-locating structure has two inner rings with side ribs and a plain outer ring joined by retaining rings for handling; axial displacement of shaft relative to housing occurs inside the bearing without constraint Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 210 mm outside diameter and 410 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 150 mm seat, and in heavy industrial gearbox shafts the 6.45 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 60 mm width and the published 820 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL024930?", "a": "The SL024930 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 210 mm outside diameter, 150 mm bore and 60 mm width, envelope 150×210×60 mm. Mass is 6.45 kg." }, { "q": "What does the SL024930 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024930 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 150×210×60 mm and the catalogue ratings are C 410 kN, C0 820 kN, Cur 106 kN." }, { "q": "What is the load capacity of the SL024930?", "a": "The basic dynamic load rating C is 410 kN and the basic static load rating C0 is 820 kN; the fatigue load limit Cur is 106 kN." }, { "q": "What is the maximum speed of the SL024930?", "a": "The limiting speed is 1,790 r/min and the thermal reference speed is 1,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024930?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024930", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024930", "SL024930" ], "locale_variants": {} }, { "sku": "SL185030", "brand": "FAG", "manufacturer_designation": "SL185030", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 810, "static_load_kN": 1390, "fatigue_load_limit_kN": 186, "limiting_speed_rpm": 1740, "max_rpm": 1740, "reference_speed_rpm": 1150, "weight_g": 13300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×225×100 mm with a 37.5 mm radial section; every available circumferential space carries a roller because there is no cage C is 810 kN and C0 1390 kN; with a C/C0 ratio of 0.58 the 100 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 186 kN, the limiting speed 1,740 r/min and the thermal reference speed 1,150 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.40 kN per millimetre of the 150 mm bore and 8.10 kN per millimetre of the 100 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 13.3 kg (13300 g) (0.59 g per mm² of the 225×100 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 150 mm bore, 225 mm outside diameter: at this size the 1390 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Full-complement kinematics cap the speed at 1,740 r/min (reference 1,150 r/min); below that limit the double-row pack offers exceptional stiffness for its section The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 225 mm outside diameter and 810 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 150 mm seat, and in hydraulic pumps and radial piston pumps the 13.3 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 100 mm width and the published 1390 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL185030?", "a": "The SL185030 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 225 mm outside diameter, 150 mm bore and 100 mm width, envelope 150×225×100 mm. Mass is 13.3 kg." }, { "q": "What does the SL185030 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185030 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 150×225×100 mm and the catalogue ratings are C 810 kN, C0 1390 kN, Cur 186 kN." }, { "q": "What is the load capacity of the SL185030?", "a": "The basic dynamic load rating C is 810 kN and the basic static load rating C0 is 1390 kN; the fatigue load limit Cur is 186 kN." }, { "q": "What is the maximum speed of the SL185030?", "a": "The limiting speed is 1,740 r/min and the thermal reference speed is 1,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185030?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185030", "SL185030" ], "locale_variants": {} }, { "sku": "SL014932", "brand": "FAG", "manufacturer_designation": "SL014932", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 425, "static_load_kN": 880, "fatigue_load_limit_kN": 112, "limiting_speed_rpm": 1660, "max_rpm": 1660, "reference_speed_rpm": 1080, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×220×60 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 425 kN and C0 880 kN; with a C/C0 ratio of 0.48 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 112 kN, the limiting speed 1,660 r/min and the thermal reference speed 1,080 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.66 kN per millimetre of the 160 mm bore and 7.08 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 7 kg (7000 g) (0.53 g per mm² of the 220×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 160 mm bore, 220 mm outside diameter: at this size the 880 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The locating structure has an axially split outer ring with ribs on both sides, joined by retaining rings, and an inner ring with a centre rib — the 60 mm width houses two complete roller rows No angular compensation is built in: misalignment loads one roller row preferentially, so the housing and shaft seats for a 160 mm bore SL0149 must be machined parallel Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 220 mm outside diameter and 425 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 160 mm seat, and in planetary gear bearing positions the 7 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 60 mm width and the published 880 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL014932?", "a": "The SL014932 is a SL0149 double-row full-complement locating cylindrical roller bearing with 220 mm outside diameter, 160 mm bore and 60 mm width, envelope 160×220×60 mm. Mass is 7 kg." }, { "q": "What does the SL014932 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014932 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 160×220×60 mm and the catalogue ratings are C 425 kN, C0 880 kN, Cur 112 kN." }, { "q": "What is the load capacity of the SL014932?", "a": "The basic dynamic load rating C is 425 kN and the basic static load rating C0 is 880 kN; the fatigue load limit Cur is 112 kN." }, { "q": "What is the maximum speed of the SL014932?", "a": "The limiting speed is 1,660 r/min and the thermal reference speed is 1,080 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014932?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014932", "SL014932" ], "locale_variants": {} }, { "sku": "SL024932", "brand": "FAG", "manufacturer_designation": "SL024932", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 425, "static_load_kN": 880, "fatigue_load_limit_kN": 112, "limiting_speed_rpm": 1660, "max_rpm": 1660, "reference_speed_rpm": 1080, "weight_g": 6800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×220×60 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 425 kN and C0 880 kN; with a C/C0 ratio of 0.48 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 112 kN, the limiting speed 1,660 r/min and the thermal reference speed 1,080 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.66 kN per millimetre of the 160 mm bore and 7.08 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 6.8 kg (6800 g) (0.52 g per mm² of the 220×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 160 mm bore, 220 mm outside diameter: at this size the 880 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs At 160 mm bore and 6.8 kg, the SL0249 is specified in rolling-mill gearboxes, travelling mechanisms and construction machinery where thermal shaft growth must not induce thrust The cageless double pack is speed-limited to 1,660 r/min (reference 1,080 r/min) but accepts purely radial loads with the rigidity required in heavy industrial gearboxes Typical applications include crane travelling-wheel mechanisms, compact slow-speed agitator drives and heavy industrial gearbox shafts, where the 220 mm outside diameter and 425 kN dynamic rating match the duty. In crane travelling-wheel mechanisms the unit fits a compact 160 mm seat, and in compact slow-speed agitator drives the 6.8 kg mass is part of the rotor inertia calculation. Designers also specify it for heavy industrial gearbox shafts, relying on the 60 mm width and the published 880 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL024932?", "a": "The SL024932 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 220 mm outside diameter, 160 mm bore and 60 mm width, envelope 160×220×60 mm. Mass is 6.8 kg." }, { "q": "What does the SL024932 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024932 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 160×220×60 mm and the catalogue ratings are C 425 kN, C0 880 kN, Cur 112 kN." }, { "q": "What is the load capacity of the SL024932?", "a": "The basic dynamic load rating C is 425 kN and the basic static load rating C0 is 880 kN; the fatigue load limit Cur is 112 kN." }, { "q": "What is the maximum speed of the SL024932?", "a": "The limiting speed is 1,660 r/min and the thermal reference speed is 1,080 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024932?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024932", "SL024932" ], "locale_variants": {} }, { "sku": "SL185032", "brand": "FAG", "manufacturer_designation": "SL185032", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 930, "static_load_kN": 1610, "fatigue_load_limit_kN": 210, "limiting_speed_rpm": 1600, "max_rpm": 1600, "reference_speed_rpm": 1030, "weight_g": 12200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×240×109 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 930 kN and C0 1610 kN; with a C/C0 ratio of 0.58 the 109 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 210 kN, the limiting speed 1,600 r/min and the thermal reference speed 1,030 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.81 kN per millimetre of the 160 mm bore and 8.53 kN per millimetre of the 109 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 12.2 kg (12200 g) (0.47 g per mm² of the 240×109 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 160 mm bore this is among the largest catalogue sizes; the 1,600 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 160 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 240 mm outside diameter and 930 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 160 mm seat, and in rope drums and winch drums the 12.2 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 109 mm width and the published 1610 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL185032?", "a": "The SL185032 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 240 mm outside diameter, 160 mm bore and 109 mm width, envelope 160×240×109 mm. Mass is 12.2 kg." }, { "q": "What does the SL185032 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185032 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 160×240×109 mm and the catalogue ratings are C 930 kN, C0 1610 kN, Cur 210 kN." }, { "q": "What is the load capacity of the SL185032?", "a": "The basic dynamic load rating C is 930 kN and the basic static load rating C0 is 1610 kN; the fatigue load limit Cur is 210 kN." }, { "q": "What is the maximum speed of the SL185032?", "a": "The limiting speed is 1,600 r/min and the thermal reference speed is 1,030 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185032?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185032", "SL185032" ], "locale_variants": {} }, { "sku": "SL014934", "brand": "FAG", "manufacturer_designation": "SL014934", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 435, "static_load_kN": 930, "fatigue_load_limit_kN": 116, "limiting_speed_rpm": 1580, "max_rpm": 1580, "reference_speed_rpm": 1010, "weight_g": 7350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×230×60 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 435 kN and C0 930 kN; with a C/C0 ratio of 0.47 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 116 kN, the limiting speed 1,580 r/min and the thermal reference speed 1,010 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.56 kN per millimetre of the 170 mm bore and 7.25 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 7.35 kg (7350 g) (0.53 g per mm² of the 230×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 170 mm bore this is among the largest catalogue sizes; the 1,580 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position As the fixed (locating) bearing it takes the thermal-expansion thrust from the shaft while the paired floating bearing moves; the limiting speed here is 1,580 r/min The locating structure has an axially split outer ring with ribs on both sides, joined by retaining rings, and an inner ring with a centre rib — the 60 mm width houses two complete roller rows Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 230 mm outside diameter and 435 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 170 mm seat, and in material handling conveyor pulleys the 7.35 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 60 mm width and the published 930 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL014934?", "a": "The SL014934 is a SL0149 double-row full-complement locating cylindrical roller bearing with 230 mm outside diameter, 170 mm bore and 60 mm width, envelope 170×230×60 mm. Mass is 7.35 kg." }, { "q": "What does the SL014934 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014934 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 170×230×60 mm and the catalogue ratings are C 435 kN, C0 930 kN, Cur 116 kN." }, { "q": "What is the load capacity of the SL014934?", "a": "The basic dynamic load rating C is 435 kN and the basic static load rating C0 is 930 kN; the fatigue load limit Cur is 116 kN." }, { "q": "What is the maximum speed of the SL014934?", "a": "The limiting speed is 1,580 r/min and the thermal reference speed is 1,010 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014934?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014934", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014934", "SL014934" ], "locale_variants": {} }, { "sku": "SL024934", "brand": "FAG", "manufacturer_designation": "SL024934", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 435, "static_load_kN": 930, "fatigue_load_limit_kN": 116, "limiting_speed_rpm": 1580, "max_rpm": 1580, "reference_speed_rpm": 1010, "weight_g": 7100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×230×60 mm with a 30.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 435 kN and C0 930 kN; with a C/C0 ratio of 0.47 the 60 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 116 kN, the limiting speed 1,580 r/min and the thermal reference speed 1,010 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 2.56 kN per millimetre of the 170 mm bore and 7.25 kN per millimetre of the 60 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 7.1 kg (7100 g) (0.51 g per mm² of the 230×60 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 170 mm bore this is among the largest catalogue sizes; the 1,580 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading SL0249: the DIN 5412-9 type code family NNCL49 — double row, no cage, flangeless outer ring; the open design is relubricated through groove and holes in the outer ring SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 230 mm outside diameter and 435 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 170 mm seat, and in construction machinery slewing drives the 7.1 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 60 mm width and the published 930 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL024934?", "a": "The SL024934 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 230 mm outside diameter, 170 mm bore and 60 mm width, envelope 170×230×60 mm. Mass is 7.1 kg." }, { "q": "What does the SL024934 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024934 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 170×230×60 mm and the catalogue ratings are C 435 kN, C0 930 kN, Cur 116 kN." }, { "q": "What is the load capacity of the SL024934?", "a": "The basic dynamic load rating C is 435 kN and the basic static load rating C0 is 930 kN; the fatigue load limit Cur is 116 kN." }, { "q": "What is the maximum speed of the SL024934?", "a": "The limiting speed is 1,580 r/min and the thermal reference speed is 1,010 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024934?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024934", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024934", "SL024934" ], "locale_variants": {} }, { "sku": "SL185034", "brand": "FAG", "manufacturer_designation": "SL185034", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 122, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1200, "static_load_kN": 2110, "fatigue_load_limit_kN": 270, "limiting_speed_rpm": 1480, "max_rpm": 1480, "reference_speed_rpm": 900, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×260×122 mm with a 45.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1200 kN and C0 2110 kN; with a C/C0 ratio of 0.57 the 122 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 270 kN, the limiting speed 1,480 r/min and the thermal reference speed 900 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.06 kN per millimetre of the 170 mm bore and 9.84 kN per millimetre of the 122 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 22.5 kg (22500 g) (0.71 g per mm² of the 260×122 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 170 mm bore puts this execution at the top of the HR1 range — the 260 mm outside diameter, 122 mm width and 22.5 kg mass are built for primary-industry load cases Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes Two cageless roller rows inside the 260×122 mm envelope give C 1200 kN and C0 2110 kN — among the highest radial capacities available at the 170 mm bore Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 260 mm outside diameter and 1200 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 170 mm seat, and in heavy industrial gearbox shafts the 22.5 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 122 mm width and the published 2110 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL185034?", "a": "The SL185034 is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 260 mm outside diameter, 170 mm bore and 122 mm width, envelope 170×260×122 mm. Mass is 22.5 kg." }, { "q": "What does the SL185034 designation mean in the FAG/INA HR1 catalogue?", "a": "SL185034 identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 170×260×122 mm and the catalogue ratings are C 1200 kN, C0 2110 kN, Cur 270 kN." }, { "q": "What is the load capacity of the SL185034?", "a": "The basic dynamic load rating C is 1200 kN and the basic static load rating C0 is 2110 kN; the fatigue load limit Cur is 270 kN." }, { "q": "What is the maximum speed of the SL185034?", "a": "The limiting speed is 1,480 r/min and the thermal reference speed is 900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185034?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185034", "SL185034" ], "locale_variants": {} }, { "sku": "SL014936", "brand": "FAG", "manufacturer_designation": "SL014936", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 570, "static_load_kN": 1200, "fatigue_load_limit_kN": 149, "limiting_speed_rpm": 1480, "max_rpm": 1480, "reference_speed_rpm": 920, "weight_g": 10800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×250×69 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 570 kN and C0 1200 kN; with a C/C0 ratio of 0.47 the 69 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 149 kN, the limiting speed 1,480 r/min and the thermal reference speed 920 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.17 kN per millimetre of the 180 mm bore and 8.26 kN per millimetre of the 69 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 10.8 kg (10800 g) (0.63 g per mm² of the 250×69 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 180 mm bore puts this execution at the top of the HR1 range — the 250 mm outside diameter, 69 mm width and 10.8 kg mass are built for primary-industry load cases SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Reading SL0149: the DIN 5412-9 type code family NNC49, double-row full complement with split outer ring; the joining retaining rings must not be used to transmit axial force Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 250 mm outside diameter and 570 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 180 mm seat, and in hydraulic pumps and radial piston pumps the 10.8 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 69 mm width and the published 1200 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL014936?", "a": "The SL014936 is a SL0149 double-row full-complement locating cylindrical roller bearing with 250 mm outside diameter, 180 mm bore and 69 mm width, envelope 180×250×69 mm. Mass is 10.8 kg." }, { "q": "What does the SL014936 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014936 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 180×250×69 mm and the catalogue ratings are C 570 kN, C0 1200 kN, Cur 149 kN." }, { "q": "What is the load capacity of the SL014936?", "a": "The basic dynamic load rating C is 570 kN and the basic static load rating C0 is 1200 kN; the fatigue load limit Cur is 149 kN." }, { "q": "What is the maximum speed of the SL014936?", "a": "The limiting speed is 1,480 r/min and the thermal reference speed is 920 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014936?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014936", "SL014936" ], "locale_variants": {} }, { "sku": "SL024936", "brand": "FAG", "manufacturer_designation": "SL024936", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 570, "static_load_kN": 1200, "fatigue_load_limit_kN": 149, "limiting_speed_rpm": 1480, "max_rpm": 1480, "reference_speed_rpm": 920, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×250×69 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 570 kN and C0 1200 kN; with a C/C0 ratio of 0.47 the 69 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 149 kN, the limiting speed 1,480 r/min and the thermal reference speed 920 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.17 kN per millimetre of the 180 mm bore and 8.26 kN per millimetre of the 69 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 10.5 kg (10500 g) (0.61 g per mm² of the 250×69 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 180 mm bore puts this execution at the top of the HR1 range — the 250 mm outside diameter, 69 mm width and 10.5 kg mass are built for primary-industry load cases SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Reading SL0249: the DIN 5412-9 type code family NNCL49 — double row, no cage, flangeless outer ring; the open design is relubricated through groove and holes in the outer ring Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 250 mm outside diameter and 570 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 180 mm seat, and in rolling-mill and steel-industry drives the 10.5 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 69 mm width and the published 1200 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL024936?", "a": "The SL024936 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 250 mm outside diameter, 180 mm bore and 69 mm width, envelope 180×250×69 mm. Mass is 10.5 kg." }, { "q": "What does the SL024936 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024936 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 180×250×69 mm and the catalogue ratings are C 570 kN, C0 1200 kN, Cur 149 kN." }, { "q": "What is the load capacity of the SL024936?", "a": "The basic dynamic load rating C is 570 kN and the basic static load rating C0 is 1200 kN; the fatigue load limit Cur is 149 kN." }, { "q": "What is the maximum speed of the SL024936?", "a": "The limiting speed is 1,480 r/min and the thermal reference speed is 920 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024936?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024936", "SL024936" ], "locale_variants": {} }, { "sku": "SL185036-TB", "brand": "FAG", "manufacturer_designation": "SL185036-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 136, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1390, "static_load_kN": 2480, "fatigue_load_limit_kN": 315, "limiting_speed_rpm": 1370, "max_rpm": 1370, "reference_speed_rpm": 820, "weight_g": 29900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×280×136 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1390 kN and C0 2480 kN; with a C/C0 ratio of 0.56 the 136 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 315 kN, the limiting speed 1,370 r/min and the thermal reference speed 820 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.72 kN per millimetre of the 180 mm bore and 10.22 kN per millimetre of the 136 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 29.9 kg (29900 g) (0.79 g per mm² of the 280×136 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 180 mm bore this is among the largest catalogue sizes; the 1,370 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The semi-locating SL1850 structure uses inner-ring ribs with a retaining ring on the flangeless side; it carries high radial loads plus axial load in one direction, which is why it often pairs with an SL0149 locating bearing The -TB feature concerns the rib contact, not the envelope: the 180×280×136 mm dimensions and 29.9 kg mass follow the standard series plan. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 280 mm outside diameter and 1390 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 180 mm seat, and in material handling conveyor pulleys the 29.9 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 136 mm width and the published 2480 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL185036-TB?", "a": "The SL185036-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 280 mm outside diameter, 180 mm bore and 136 mm width, envelope 180×280×136 mm. Mass is 29.9 kg." }, { "q": "What does the SL185036-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185036-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 180×280×136 mm and the catalogue ratings are C 1390 kN, C0 2480 kN, Cur 315 kN." }, { "q": "What is the load capacity of the SL185036-TB?", "a": "The basic dynamic load rating C is 1390 kN and the basic static load rating C0 is 2480 kN; the fatigue load limit Cur is 315 kN." }, { "q": "What is the maximum speed of the SL185036-TB?", "a": "The limiting speed is 1,370 r/min and the thermal reference speed is 820 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185036-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185036-TB", "SL185036-TB" ], "locale_variants": {} }, { "sku": "SL014938", "brand": "FAG", "manufacturer_designation": "SL014938", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 580, "static_load_kN": 1270, "fatigue_load_limit_kN": 155, "limiting_speed_rpm": 1410, "max_rpm": 1410, "reference_speed_rpm": 860, "weight_g": 11200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×260×69 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 580 kN and C0 1270 kN; with a C/C0 ratio of 0.46 the 69 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 155 kN, the limiting speed 1,410 r/min and the thermal reference speed 860 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.05 kN per millimetre of the 190 mm bore and 8.41 kN per millimetre of the 69 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 11.2 kg (11200 g) (0.62 g per mm² of the 260×69 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 190 mm bore, 260 mm outside diameter: at this size the 1270 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Inside the 190×260×69 mm envelope the two cageless rows provide C0 1270 kN, the capacity this series is selected for in heavy gearbox and drum positions Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 260 mm outside diameter and 580 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 190 mm seat, and in rope drums and winch drums the 11.2 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 69 mm width and the published 1270 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL014938?", "a": "The SL014938 is a SL0149 double-row full-complement locating cylindrical roller bearing with 260 mm outside diameter, 190 mm bore and 69 mm width, envelope 190×260×69 mm. Mass is 11.2 kg." }, { "q": "What does the SL014938 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014938 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 190×260×69 mm and the catalogue ratings are C 580 kN, C0 1270 kN, Cur 155 kN." }, { "q": "What is the load capacity of the SL014938?", "a": "The basic dynamic load rating C is 580 kN and the basic static load rating C0 is 1270 kN; the fatigue load limit Cur is 155 kN." }, { "q": "What is the maximum speed of the SL014938?", "a": "The limiting speed is 1,410 r/min and the thermal reference speed is 860 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014938?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014938", "SL014938" ], "locale_variants": {} }, { "sku": "SL024938", "brand": "FAG", "manufacturer_designation": "SL024938", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 580, "static_load_kN": 1270, "fatigue_load_limit_kN": 155, "limiting_speed_rpm": 1410, "max_rpm": 1410, "reference_speed_rpm": 860, "weight_g": 10900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×260×69 mm with a 35.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 580 kN and C0 1270 kN; with a C/C0 ratio of 0.46 the 69 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 155 kN, the limiting speed 1,410 r/min and the thermal reference speed 860 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.05 kN per millimetre of the 190 mm bore and 8.41 kN per millimetre of the 69 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 10.9 kg (10900 g) (0.61 g per mm² of the 260×69 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 190 mm bore, 260 mm outside diameter: at this size the 1270 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The cageless double pack is speed-limited to 1,410 r/min (reference 860 r/min) but accepts purely radial loads with the rigidity required in heavy industrial gearboxes At 190 mm bore and 10.9 kg, the SL0249 is specified in rolling-mill gearboxes, travelling mechanisms and construction machinery where thermal shaft growth must not induce thrust Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 260 mm outside diameter and 580 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 190 mm seat, and in marine and offshore winch arrangements the 10.9 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 69 mm width and the published 1270 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL024938?", "a": "The SL024938 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 260 mm outside diameter, 190 mm bore and 69 mm width, envelope 190×260×69 mm. Mass is 10.9 kg." }, { "q": "What does the SL024938 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024938 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 190×260×69 mm and the catalogue ratings are C 580 kN, C0 1270 kN, Cur 155 kN." }, { "q": "What is the load capacity of the SL024938?", "a": "The basic dynamic load rating C is 580 kN and the basic static load rating C0 is 1270 kN; the fatigue load limit Cur is 155 kN." }, { "q": "What is the maximum speed of the SL024938?", "a": "The limiting speed is 1,410 r/min and the thermal reference speed is 860 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024938?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024938", "SL024938" ], "locale_variants": {} }, { "sku": "SL185038-TB", "brand": "FAG", "manufacturer_designation": "SL185038-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 136, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1430, "static_load_kN": 2600, "fatigue_load_limit_kN": 325, "limiting_speed_rpm": 1320, "max_rpm": 1320, "reference_speed_rpm": 770, "weight_g": 31300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×290×136 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1430 kN and C0 2600 kN; with a C/C0 ratio of 0.55 the 136 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 325 kN, the limiting speed 1,320 r/min and the thermal reference speed 770 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 7.53 kN per millimetre of the 190 mm bore and 10.51 kN per millimetre of the 136 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 31.3 kg (31300 g) (0.79 g per mm² of the 290×136 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 190 mm bore this is among the largest catalogue sizes; the 1,320 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement The semi-locating SL1850 structure uses inner-ring ribs with a retaining ring on the flangeless side; it carries high radial loads plus axial load in one direction, which is why it often pairs with an SL0149 locating bearing The -TB suffix denotes the increased axial-load design: profiled roller ends and optimised rib contact geometry lower edge stress and friction at the guide ribs. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 290 mm outside diameter and 1430 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 190 mm seat, and in rolling-mill and steel-industry drives the 31.3 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 136 mm width and the published 2600 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL185038-TB?", "a": "The SL185038-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 290 mm outside diameter, 190 mm bore and 136 mm width, envelope 190×290×136 mm. Mass is 31.3 kg." }, { "q": "What does the SL185038-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185038-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 190×290×136 mm and the catalogue ratings are C 1430 kN, C0 2600 kN, Cur 325 kN." }, { "q": "What is the load capacity of the SL185038-TB?", "a": "The basic dynamic load rating C is 1430 kN and the basic static load rating C0 is 2600 kN; the fatigue load limit Cur is 325 kN." }, { "q": "What is the maximum speed of the SL185038-TB?", "a": "The limiting speed is 1,320 r/min and the thermal reference speed is 770 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185038-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=551", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185038-TB", "SL185038-TB" ], "locale_variants": {} }, { "sku": "SL014940", "brand": "FAG", "manufacturer_designation": "SL014940", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 680, "static_load_kN": 1440, "fatigue_load_limit_kN": 176, "limiting_speed_rpm": 1310, "max_rpm": 1310, "reference_speed_rpm": 820, "weight_g": 15800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×280×80 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 680 kN and C0 1440 kN; with a C/C0 ratio of 0.47 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 176 kN, the limiting speed 1,310 r/min and the thermal reference speed 820 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.40 kN per millimetre of the 200 mm bore and 8.50 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 15.8 kg (15800 g) (0.71 g per mm² of the 280×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 200 mm bore this is among the largest catalogue sizes; the 1,310 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The locating structure has an axially split outer ring with ribs on both sides, joined by retaining rings, and an inner ring with a centre rib — the 80 mm width houses two complete roller rows Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 280 mm outside diameter and 680 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 200 mm seat, and in hydraulic pumps and radial piston pumps the 15.8 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 80 mm width and the published 1440 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL014940?", "a": "The SL014940 is a SL0149 double-row full-complement locating cylindrical roller bearing with 280 mm outside diameter, 200 mm bore and 80 mm width, envelope 200×280×80 mm. Mass is 15.8 kg." }, { "q": "What does the SL014940 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014940 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 200×280×80 mm and the catalogue ratings are C 680 kN, C0 1440 kN, Cur 176 kN." }, { "q": "What is the load capacity of the SL014940?", "a": "The basic dynamic load rating C is 680 kN and the basic static load rating C0 is 1440 kN; the fatigue load limit Cur is 176 kN." }, { "q": "What is the maximum speed of the SL014940?", "a": "The limiting speed is 1,310 r/min and the thermal reference speed is 820 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014940?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014940", "SL014940" ], "locale_variants": {} }, { "sku": "SL024940", "brand": "FAG", "manufacturer_designation": "SL024940", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 680, "static_load_kN": 1440, "fatigue_load_limit_kN": 176, "limiting_speed_rpm": 1310, "max_rpm": 1310, "reference_speed_rpm": 820, "weight_g": 15300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×280×80 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 680 kN and C0 1440 kN; with a C/C0 ratio of 0.47 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 176 kN, the limiting speed 1,310 r/min and the thermal reference speed 820 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.40 kN per millimetre of the 200 mm bore and 8.50 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 15.3 kg (15300 g) (0.68 g per mm² of the 280×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 200 mm bore this is among the largest catalogue sizes; the 1,310 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position At 200 mm bore and 15.3 kg, the SL0249 is specified in rolling-mill gearboxes, travelling mechanisms and construction machinery where thermal shaft growth must not induce thrust Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 280 mm outside diameter and 680 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 200 mm seat, and in rolling-mill and steel-industry drives the 15.3 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 80 mm width and the published 1440 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL024940?", "a": "The SL024940 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 280 mm outside diameter, 200 mm bore and 80 mm width, envelope 200×280×80 mm. Mass is 15.3 kg." }, { "q": "What does the SL024940 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024940 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 200×280×80 mm and the catalogue ratings are C 680 kN, C0 1440 kN, Cur 176 kN." }, { "q": "What is the load capacity of the SL024940?", "a": "The basic dynamic load rating C is 680 kN and the basic static load rating C0 is 1440 kN; the fatigue load limit Cur is 176 kN." }, { "q": "What is the maximum speed of the SL024940?", "a": "The limiting speed is 1,310 r/min and the thermal reference speed is 820 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024940?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024940", "SL024940" ], "locale_variants": {} }, { "sku": "SL185040-TB", "brand": "FAG", "manufacturer_designation": "SL185040-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1630, "static_load_kN": 3000, "fatigue_load_limit_kN": 375, "limiting_speed_rpm": 1230, "max_rpm": 1230, "reference_speed_rpm": 710, "weight_g": 40400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×310×150 mm with a 55.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1630 kN and C0 3000 kN; with a C/C0 ratio of 0.54 the 150 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 375 kN, the limiting speed 1,230 r/min and the thermal reference speed 710 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 8.15 kN per millimetre of the 200 mm bore and 10.87 kN per millimetre of the 150 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 40.4 kg (40400 g) (0.87 g per mm² of the 310×150 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 200 mm bore, 310 mm outside diameter: at this size the 3000 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Two cageless roller rows inside the 310×150 mm envelope give C 1630 kN and C0 3000 kN — among the highest radial capacities available at the 200 mm bore The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 1630 kN C. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 310 mm outside diameter and 1630 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 200 mm seat, and in planetary gear bearing positions the 40.4 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 150 mm width and the published 3000 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL185040-TB?", "a": "The SL185040-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 310 mm outside diameter, 200 mm bore and 150 mm width, envelope 200×310×150 mm. Mass is 40.4 kg." }, { "q": "What does the SL185040-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185040-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 200×310×150 mm and the catalogue ratings are C 1630 kN, C0 3000 kN, Cur 375 kN." }, { "q": "What is the load capacity of the SL185040-TB?", "a": "The basic dynamic load rating C is 1630 kN and the basic static load rating C0 is 3000 kN; the fatigue load limit Cur is 375 kN." }, { "q": "What is the maximum speed of the SL185040-TB?", "a": "The limiting speed is 1,230 r/min and the thermal reference speed is 710 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185040-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185040", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185040-TB", "SL185040-TB" ], "locale_variants": {} }, { "sku": "SL014944", "brand": "FAG", "manufacturer_designation": "SL014944", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 700, "static_load_kN": 1550, "fatigue_load_limit_kN": 185, "limiting_speed_rpm": 1220, "max_rpm": 1220, "reference_speed_rpm": 750, "weight_g": 17200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×300×80 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 700 kN and C0 1550 kN; with a C/C0 ratio of 0.45 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 185 kN, the limiting speed 1,220 r/min and the thermal reference speed 750 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.18 kN per millimetre of the 220 mm bore and 8.75 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 17.2 kg (17200 g) (0.72 g per mm² of the 300×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 220 mm bore, 300 mm outside diameter: at this size the 1550 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Inside the 220×300×80 mm envelope the two cageless rows provide C0 1550 kN, the capacity this series is selected for in heavy gearbox and drum positions SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 300 mm outside diameter and 700 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 220 mm seat, and in heavy industrial gearbox shafts the 17.2 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 80 mm width and the published 1550 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL014944?", "a": "The SL014944 is a SL0149 double-row full-complement locating cylindrical roller bearing with 300 mm outside diameter, 220 mm bore and 80 mm width, envelope 220×300×80 mm. Mass is 17.2 kg." }, { "q": "What does the SL014944 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014944 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 220×300×80 mm and the catalogue ratings are C 700 kN, C0 1550 kN, Cur 185 kN." }, { "q": "What is the load capacity of the SL014944?", "a": "The basic dynamic load rating C is 700 kN and the basic static load rating C0 is 1550 kN; the fatigue load limit Cur is 185 kN." }, { "q": "What is the maximum speed of the SL014944?", "a": "The limiting speed is 1,220 r/min and the thermal reference speed is 750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014944?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014944", "SL014944" ], "locale_variants": {} }, { "sku": "SL024944", "brand": "FAG", "manufacturer_designation": "SL024944", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 700, "static_load_kN": 1550, "fatigue_load_limit_kN": 185, "limiting_speed_rpm": 1220, "max_rpm": 1220, "reference_speed_rpm": 750, "weight_g": 16700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×300×80 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 700 kN and C0 1550 kN; with a C/C0 ratio of 0.45 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 185 kN, the limiting speed 1,220 r/min and the thermal reference speed 750 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.18 kN per millimetre of the 220 mm bore and 8.75 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 16.7 kg (16700 g) (0.70 g per mm² of the 300×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 220 mm bore, 300 mm outside diameter: at this size the 1550 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Shaft and housing shoulders must still locate the rings themselves even though the bearing floats internally; the 40.0 mm section ring is too stiff to self-align Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 300 mm outside diameter and 700 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 220 mm seat, and in vibrating and oscillating machinery the 16.7 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 80 mm width and the published 1550 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL024944?", "a": "The SL024944 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 300 mm outside diameter, 220 mm bore and 80 mm width, envelope 220×300×80 mm. Mass is 16.7 kg." }, { "q": "What does the SL024944 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024944 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 220×300×80 mm and the catalogue ratings are C 700 kN, C0 1550 kN, Cur 185 kN." }, { "q": "What is the load capacity of the SL024944?", "a": "The basic dynamic load rating C is 700 kN and the basic static load rating C0 is 1550 kN; the fatigue load limit Cur is 185 kN." }, { "q": "What is the maximum speed of the SL024944?", "a": "The limiting speed is 1,220 r/min and the thermal reference speed is 750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024944?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024944", "SL024944" ], "locale_variants": {} }, { "sku": "SL185044-TB", "brand": "FAG", "manufacturer_designation": "SL185044-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1980, "static_load_kN": 3650, "fatigue_load_limit_kN": 440, "limiting_speed_rpm": 1140, "max_rpm": 1140, "reference_speed_rpm": 630, "weight_g": 51600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×340×160 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1980 kN and C0 3650 kN; with a C/C0 ratio of 0.54 the 160 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 440 kN, the limiting speed 1,140 r/min and the thermal reference speed 630 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 9.00 kN per millimetre of the 220 mm bore and 12.38 kN per millimetre of the 160 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 51.6 kg (51600 g) (0.95 g per mm² of the 340×160 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 220 mm bore, 340 mm outside diameter: at this size the 3650 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 220 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes The -TB feature concerns the rib contact, not the envelope: the 220×340×160 mm dimensions and 51.6 kg mass follow the standard series plan. Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 340 mm outside diameter and 1980 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 220 mm seat, and in rope drums and winch drums the 51.6 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 160 mm width and the published 3650 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "rolling-mill and steel-industry drives", "vibrating and oscillating machinery", "material handling conveyor pulleys", "construction machinery slewing drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL185044-TB?", "a": "The SL185044-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 340 mm outside diameter, 220 mm bore and 160 mm width, envelope 220×340×160 mm. Mass is 51.6 kg." }, { "q": "What does the SL185044-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185044-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 220×340×160 mm and the catalogue ratings are C 1980 kN, C0 3650 kN, Cur 440 kN." }, { "q": "What is the load capacity of the SL185044-TB?", "a": "The basic dynamic load rating C is 1980 kN and the basic static load rating C0 is 3650 kN; the fatigue load limit Cur is 440 kN." }, { "q": "What is the maximum speed of the SL185044-TB?", "a": "The limiting speed is 1,140 r/min and the thermal reference speed is 630 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185044-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185044-TB", "SL185044-TB" ], "locale_variants": {} }, { "sku": "SL014948", "brand": "FAG", "manufacturer_designation": "SL014948", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 740, "static_load_kN": 1700, "fatigue_load_limit_kN": 198, "limiting_speed_rpm": 1110, "max_rpm": 1110, "reference_speed_rpm": 660, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×320×80 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 740 kN and C0 1700 kN; with a C/C0 ratio of 0.44 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 198 kN, the limiting speed 1,110 r/min and the thermal reference speed 660 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.08 kN per millimetre of the 240 mm bore and 9.25 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 18.5 kg (18500 g) (0.72 g per mm² of the 320×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 240 mm bore puts this execution at the top of the HR1 range — the 320 mm outside diameter, 80 mm width and 18.5 kg mass are built for primary-industry load cases Reading SL0149: the DIN 5412-9 type code family NNC49, double-row full complement with split outer ring; the joining retaining rings must not be used to transmit axial force No angular compensation is built in: misalignment loads one roller row preferentially, so the housing and shaft seats for a 240 mm bore SL0149 must be machined parallel Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 320 mm outside diameter and 740 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 240 mm seat, and in construction machinery slewing drives the 18.5 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 80 mm width and the published 1700 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL014948?", "a": "The SL014948 is a SL0149 double-row full-complement locating cylindrical roller bearing with 320 mm outside diameter, 240 mm bore and 80 mm width, envelope 240×320×80 mm. Mass is 18.5 kg." }, { "q": "What does the SL014948 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014948 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 240×320×80 mm and the catalogue ratings are C 740 kN, C0 1700 kN, Cur 198 kN." }, { "q": "What is the load capacity of the SL014948?", "a": "The basic dynamic load rating C is 740 kN and the basic static load rating C0 is 1700 kN; the fatigue load limit Cur is 198 kN." }, { "q": "What is the maximum speed of the SL014948?", "a": "The limiting speed is 1,110 r/min and the thermal reference speed is 660 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014948?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014948", "SL014948" ], "locale_variants": {} }, { "sku": "SL024948", "brand": "FAG", "manufacturer_designation": "SL024948", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 740, "static_load_kN": 1700, "fatigue_load_limit_kN": 198, "limiting_speed_rpm": 1110, "max_rpm": 1110, "reference_speed_rpm": 660, "weight_g": 17900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×320×80 mm with a 40.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 740 kN and C0 1700 kN; with a C/C0 ratio of 0.44 the 80 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 198 kN, the limiting speed 1,110 r/min and the thermal reference speed 660 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 3.08 kN per millimetre of the 240 mm bore and 9.25 kN per millimetre of the 80 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 17.9 kg (17900 g) (0.70 g per mm² of the 320×80 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 240 mm bore puts this execution at the top of the HR1 range — the 320 mm outside diameter, 80 mm width and 17.9 kg mass are built for primary-industry load cases The cageless double pack is speed-limited to 1,110 r/min (reference 660 r/min) but accepts purely radial loads with the rigidity required in heavy industrial gearboxes SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 320 mm outside diameter and 740 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 240 mm seat, and in planetary gear bearing positions the 17.9 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 80 mm width and the published 1700 kN static rating. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL024948?", "a": "The SL024948 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 320 mm outside diameter, 240 mm bore and 80 mm width, envelope 240×320×80 mm. Mass is 17.9 kg." }, { "q": "What does the SL024948 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024948 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 240×320×80 mm and the catalogue ratings are C 740 kN, C0 1700 kN, Cur 198 kN." }, { "q": "What is the load capacity of the SL024948?", "a": "The basic dynamic load rating C is 740 kN and the basic static load rating C0 is 1700 kN; the fatigue load limit Cur is 198 kN." }, { "q": "What is the maximum speed of the SL024948?", "a": "The limiting speed is 1,110 r/min and the thermal reference speed is 660 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024948?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024948", "SL024948" ], "locale_variants": {} }, { "sku": "SL185048-TB", "brand": "FAG", "manufacturer_designation": "SL185048-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2080, "static_load_kN": 4000, "fatigue_load_limit_kN": 470, "limiting_speed_rpm": 1040, "max_rpm": 1040, "reference_speed_rpm": 550, "weight_g": 55200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×360×160 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2080 kN and C0 4000 kN; with a C/C0 ratio of 0.52 the 160 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 470 kN, the limiting speed 1,040 r/min and the thermal reference speed 550 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 8.67 kN per millimetre of the 240 mm bore and 13.00 kN per millimetre of the 160 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 55.2 kg (55200 g) (0.96 g per mm² of the 360×160 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 240 mm bore this is among the largest catalogue sizes; the 1,040 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Two cageless roller rows inside the 360×160 mm envelope give C 2080 kN and C0 4000 kN — among the highest radial capacities available at the 240 mm bore Full-complement kinematics cap the speed at 1,040 r/min (reference 550 r/min); below that limit the double-row pack offers exceptional stiffness for its section Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 2080 kN C. Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 360 mm outside diameter and 2080 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 240 mm seat, and in crane travelling-wheel mechanisms the 55.2 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 160 mm width and the published 4000 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL185048-TB?", "a": "The SL185048-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 360 mm outside diameter, 240 mm bore and 160 mm width, envelope 240×360×160 mm. Mass is 55.2 kg." }, { "q": "What does the SL185048-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185048-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 240×360×160 mm and the catalogue ratings are C 2080 kN, C0 4000 kN, Cur 470 kN." }, { "q": "What is the load capacity of the SL185048-TB?", "a": "The basic dynamic load rating C is 2080 kN and the basic static load rating C0 is 4000 kN; the fatigue load limit Cur is 470 kN." }, { "q": "What is the maximum speed of the SL185048-TB?", "a": "The limiting speed is 1,040 r/min and the thermal reference speed is 550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185048-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185048-TB", "SL185048-TB" ], "locale_variants": {} }, { "sku": "SL014952", "brand": "FAG", "manufacturer_designation": "SL014952", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1100, "static_load_kN": 2470, "fatigue_load_limit_kN": 285, "limiting_speed_rpm": 1010, "max_rpm": 1010, "reference_speed_rpm": 570, "weight_g": 32000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 260×360×100 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1100 kN and C0 2470 kN; with a C/C0 ratio of 0.45 the 100 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 285 kN, the limiting speed 1,010 r/min and the thermal reference speed 570 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.23 kN per millimetre of the 260 mm bore and 11.00 kN per millimetre of the 100 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 32 kg (32000 g) (0.89 g per mm² of the 360×100 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 260 mm bore this is among the largest catalogue sizes; the 1,010 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading SL0149: the DIN 5412-9 type code family NNC49, double-row full complement with split outer ring; the joining retaining rings must not be used to transmit axial force Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 360 mm outside diameter and 1100 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 260 mm seat, and in construction machinery slewing drives the 32 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 100 mm width and the published 2470 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL014952?", "a": "The SL014952 is a SL0149 double-row full-complement locating cylindrical roller bearing with 360 mm outside diameter, 260 mm bore and 100 mm width, envelope 260×360×100 mm. Mass is 32 kg." }, { "q": "What does the SL014952 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014952 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 260×360×100 mm and the catalogue ratings are C 1100 kN, C0 2470 kN, Cur 285 kN." }, { "q": "What is the load capacity of the SL014952?", "a": "The basic dynamic load rating C is 1100 kN and the basic static load rating C0 is 2470 kN; the fatigue load limit Cur is 285 kN." }, { "q": "What is the maximum speed of the SL014952?", "a": "The limiting speed is 1,010 r/min and the thermal reference speed is 570 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014952?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014952", "SL014952" ], "locale_variants": {} }, { "sku": "SL024952", "brand": "FAG", "manufacturer_designation": "SL024952", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1100, "static_load_kN": 2470, "fatigue_load_limit_kN": 285, "limiting_speed_rpm": 1010, "max_rpm": 1010, "reference_speed_rpm": 570, "weight_g": 31200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 260×360×100 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1100 kN and C0 2470 kN; with a C/C0 ratio of 0.45 the 100 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 285 kN, the limiting speed 1,010 r/min and the thermal reference speed 570 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.23 kN per millimetre of the 260 mm bore and 11.00 kN per millimetre of the 100 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 31.2 kg (31200 g) (0.87 g per mm² of the 360×100 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 260 mm bore this is among the largest catalogue sizes; the 1,010 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The non-locating structure has two inner rings with side ribs and a plain outer ring joined by retaining rings for handling; axial displacement of shaft relative to housing occurs inside the bearing without constraint Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 360 mm outside diameter and 1100 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 260 mm seat, and in planetary gear bearing positions the 31.2 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 100 mm width and the published 2470 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL024952?", "a": "The SL024952 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 360 mm outside diameter, 260 mm bore and 100 mm width, envelope 260×360×100 mm. Mass is 31.2 kg." }, { "q": "What does the SL024952 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024952 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 260×360×100 mm and the catalogue ratings are C 1100 kN, C0 2470 kN, Cur 285 kN." }, { "q": "What is the load capacity of the SL024952?", "a": "The basic dynamic load rating C is 1100 kN and the basic static load rating C0 is 2470 kN; the fatigue load limit Cur is 285 kN." }, { "q": "What is the maximum speed of the SL024952?", "a": "The limiting speed is 1,010 r/min and the thermal reference speed is 570 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024952?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024952", "SL024952" ], "locale_variants": {} }, { "sku": "SL185052-TB", "brand": "FAG", "manufacturer_designation": "SL185052-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2750, "static_load_kN": 5000, "fatigue_load_limit_kN": 580, "limiting_speed_rpm": 940, "max_rpm": 940, "reference_speed_rpm": 490, "weight_g": 82600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 260×400×190 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2750 kN and C0 5000 kN; with a C/C0 ratio of 0.55 the 190 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 580 kN, the limiting speed 940 r/min and the thermal reference speed 490 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 10.58 kN per millimetre of the 260 mm bore and 14.47 kN per millimetre of the 190 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 82.6 kg (82600 g) (1.09 g per mm² of the 400×190 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 260 mm bore, 400 mm outside diameter: at this size the 5000 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Full-complement kinematics cap the speed at 940 r/min (reference 490 r/min); below that limit the double-row pack offers exceptional stiffness for its section Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. Typical applications include compact slow-speed agitator drives, planetary gear bearing positions and crane travelling-wheel mechanisms, where the 400 mm outside diameter and 2750 kN dynamic rating match the duty. In compact slow-speed agitator drives the unit fits a compact 260 mm seat, and in planetary gear bearing positions the 82.6 kg mass is part of the rotor inertia calculation. Designers also specify it for crane travelling-wheel mechanisms, relying on the 190 mm width and the published 5000 kN static rating. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "construction machinery slewing drives", "marine and offshore winch arrangements", "planetary gear bearing positions", "compact slow-speed agitator drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL185052-TB?", "a": "The SL185052-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 400 mm outside diameter, 260 mm bore and 190 mm width, envelope 260×400×190 mm. Mass is 82.6 kg." }, { "q": "What does the SL185052-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185052-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 260×400×190 mm and the catalogue ratings are C 2750 kN, C0 5000 kN, Cur 580 kN." }, { "q": "What is the load capacity of the SL185052-TB?", "a": "The basic dynamic load rating C is 2750 kN and the basic static load rating C0 is 5000 kN; the fatigue load limit Cur is 580 kN." }, { "q": "What is the maximum speed of the SL185052-TB?", "a": "The limiting speed is 940 r/min and the thermal reference speed is 490 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185052-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185052-TB", "SL185052-TB" ], "locale_variants": {} }, { "sku": "SL014956", "brand": "FAG", "manufacturer_designation": "SL014956", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1150, "static_load_kN": 2650, "fatigue_load_limit_kN": 300, "limiting_speed_rpm": 940, "max_rpm": 940, "reference_speed_rpm": 520, "weight_g": 34000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 280×380×100 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1150 kN and C0 2650 kN; with a C/C0 ratio of 0.43 the 100 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 300 kN, the limiting speed 940 r/min and the thermal reference speed 520 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.11 kN per millimetre of the 280 mm bore and 11.50 kN per millimetre of the 100 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 34 kg (34000 g) (0.89 g per mm² of the 380×100 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 280 mm bore, 380 mm outside diameter: at this size the 2650 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Inside the 280×380×100 mm envelope the two cageless rows provide C0 2650 kN, the capacity this series is selected for in heavy gearbox and drum positions SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 380 mm outside diameter and 1150 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 280 mm seat, and in marine and offshore winch arrangements the 34 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 100 mm width and the published 2650 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL014956?", "a": "The SL014956 is a SL0149 double-row full-complement locating cylindrical roller bearing with 380 mm outside diameter, 280 mm bore and 100 mm width, envelope 280×380×100 mm. Mass is 34 kg." }, { "q": "What does the SL014956 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014956 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 280×380×100 mm and the catalogue ratings are C 1150 kN, C0 2650 kN, Cur 300 kN." }, { "q": "What is the load capacity of the SL014956?", "a": "The basic dynamic load rating C is 1150 kN and the basic static load rating C0 is 2650 kN; the fatigue load limit Cur is 300 kN." }, { "q": "What is the maximum speed of the SL014956?", "a": "The limiting speed is 940 r/min and the thermal reference speed is 520 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014956?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014956", "SL014956" ], "locale_variants": {} }, { "sku": "SL024956", "brand": "FAG", "manufacturer_designation": "SL024956", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1150, "static_load_kN": 2650, "fatigue_load_limit_kN": 300, "limiting_speed_rpm": 940, "max_rpm": 940, "reference_speed_rpm": 520, "weight_g": 33100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 280×380×100 mm with a 50.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1150 kN and C0 2650 kN; with a C/C0 ratio of 0.43 the 100 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 300 kN, the limiting speed 940 r/min and the thermal reference speed 520 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.11 kN per millimetre of the 280 mm bore and 11.50 kN per millimetre of the 100 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 33.1 kg (33100 g) (0.87 g per mm² of the 380×100 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 280 mm bore, 380 mm outside diameter: at this size the 2650 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Shaft and housing shoulders must still locate the rings themselves even though the bearing floats internally; the 50.0 mm section ring is too stiff to self-align Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 380 mm outside diameter and 1150 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 280 mm seat, and in hydraulic pumps and radial piston pumps the 33.1 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 100 mm width and the published 2650 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film." ], "faq": [ { "q": "What are the dimensions of the SL024956?", "a": "The SL024956 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 380 mm outside diameter, 280 mm bore and 100 mm width, envelope 280×380×100 mm. Mass is 33.1 kg." }, { "q": "What does the SL024956 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024956 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 280×380×100 mm and the catalogue ratings are C 1150 kN, C0 2650 kN, Cur 300 kN." }, { "q": "What is the load capacity of the SL024956?", "a": "The basic dynamic load rating C is 1150 kN and the basic static load rating C0 is 2650 kN; the fatigue load limit Cur is 300 kN." }, { "q": "What is the maximum speed of the SL024956?", "a": "The limiting speed is 940 r/min and the thermal reference speed is 520 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024956?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024956", "SL024956" ], "locale_variants": {} }, { "sku": "SL185056-TB", "brand": "FAG", "manufacturer_designation": "SL185056-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2850, "static_load_kN": 5300, "fatigue_load_limit_kN": 600, "limiting_speed_rpm": 900, "max_rpm": 900, "reference_speed_rpm": 460, "weight_g": 88000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 280×420×190 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2850 kN and C0 5300 kN; with a C/C0 ratio of 0.54 the 190 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 600 kN, the limiting speed 900 r/min and the thermal reference speed 460 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 10.18 kN per millimetre of the 280 mm bore and 15.00 kN per millimetre of the 190 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 88 kg (88000 g) (1.10 g per mm² of the 420×190 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 280 mm bore, 420 mm outside diameter: at this size the 5300 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The semi-locating SL1850 structure uses inner-ring ribs with a retaining ring on the flangeless side; it carries high radial loads plus axial load in one direction, which is why it often pairs with an SL0149 locating bearing At 88 kg (88000 g), this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 2850 kN C. Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 420 mm outside diameter and 2850 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 280 mm seat, and in material handling conveyor pulleys the 88 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 190 mm width and the published 5300 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL185056-TB?", "a": "The SL185056-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 420 mm outside diameter, 280 mm bore and 190 mm width, envelope 280×420×190 mm. Mass is 88 kg." }, { "q": "What does the SL185056-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185056-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 280×420×190 mm and the catalogue ratings are C 2850 kN, C0 5300 kN, Cur 600 kN." }, { "q": "What is the load capacity of the SL185056-TB?", "a": "The basic dynamic load rating C is 2850 kN and the basic static load rating C0 is 5300 kN; the fatigue load limit Cur is 600 kN." }, { "q": "What is the maximum speed of the SL185056-TB?", "a": "The limiting speed is 900 r/min and the thermal reference speed is 460 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185056-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185056-TB", "SL185056-TB" ], "locale_variants": {} }, { "sku": "SL014960", "brand": "FAG", "manufacturer_designation": "SL014960", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1630, "static_load_kN": 3700, "fatigue_load_limit_kN": 410, "limiting_speed_rpm": 870, "max_rpm": 870, "reference_speed_rpm": 445, "weight_g": 53000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 300×420×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1630 kN and C0 3700 kN; with a C/C0 ratio of 0.44 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 410 kN, the limiting speed 870 r/min and the thermal reference speed 445 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.43 kN per millimetre of the 300 mm bore and 13.81 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 53 kg (53000 g) (1.07 g per mm² of the 420×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 300 mm bore puts this execution at the top of the HR1 range — the 420 mm outside diameter, 118 mm width and 53 kg mass are built for primary-industry load cases SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position Inside the 300×420×118 mm envelope the two cageless rows provide C0 3700 kN, the capacity this series is selected for in heavy gearbox and drum positions Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 420 mm outside diameter and 1630 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 300 mm seat, and in marine and offshore winch arrangements the 53 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 118 mm width and the published 3700 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL014960?", "a": "The SL014960 is a SL0149 double-row full-complement locating cylindrical roller bearing with 420 mm outside diameter, 300 mm bore and 118 mm width, envelope 300×420×118 mm. Mass is 53 kg." }, { "q": "What does the SL014960 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014960 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 300×420×118 mm and the catalogue ratings are C 1630 kN, C0 3700 kN, Cur 410 kN." }, { "q": "What is the load capacity of the SL014960?", "a": "The basic dynamic load rating C is 1630 kN and the basic static load rating C0 is 3700 kN; the fatigue load limit Cur is 410 kN." }, { "q": "What is the maximum speed of the SL014960?", "a": "The limiting speed is 870 r/min and the thermal reference speed is 445 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014960?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014960", "SL014960" ], "locale_variants": {} }, { "sku": "SL024960", "brand": "FAG", "manufacturer_designation": "SL024960", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1630, "static_load_kN": 3700, "fatigue_load_limit_kN": 410, "limiting_speed_rpm": 870, "max_rpm": 870, "reference_speed_rpm": 445, "weight_g": 51900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 300×420×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1630 kN and C0 3700 kN; with a C/C0 ratio of 0.44 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 410 kN, the limiting speed 870 r/min and the thermal reference speed 445 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.43 kN per millimetre of the 300 mm bore and 13.81 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 51.9 kg (51900 g) (1.05 g per mm² of the 420×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 300 mm bore puts this execution at the top of the HR1 range — the 420 mm outside diameter, 118 mm width and 51.9 kg mass are built for primary-industry load cases The non-locating structure has two inner rings with side ribs and a plain outer ring joined by retaining rings for handling; axial displacement of shaft relative to housing occurs inside the bearing without constraint Reading SL0249: the DIN 5412-9 type code family NNCL49 — double row, no cage, flangeless outer ring; the open design is relubricated through groove and holes in the outer ring Typical applications include rolling-mill and steel-industry drives, hydraulic pumps and radial piston pumps and material handling conveyor pulleys, where the 420 mm outside diameter and 1630 kN dynamic rating match the duty. In rolling-mill and steel-industry drives the unit fits a compact 300 mm seat, and in hydraulic pumps and radial piston pumps the 51.9 kg mass is part of the rotor inertia calculation. Designers also specify it for material handling conveyor pulleys, relying on the 118 mm width and the published 3700 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL024960?", "a": "The SL024960 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 420 mm outside diameter, 300 mm bore and 118 mm width, envelope 300×420×118 mm. Mass is 51.9 kg." }, { "q": "What does the SL024960 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024960 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 300×420×118 mm and the catalogue ratings are C 1630 kN, C0 3700 kN, Cur 410 kN." }, { "q": "What is the load capacity of the SL024960?", "a": "The basic dynamic load rating C is 1630 kN and the basic static load rating C0 is 3700 kN; the fatigue load limit Cur is 410 kN." }, { "q": "What is the maximum speed of the SL024960?", "a": "The limiting speed is 870 r/min and the thermal reference speed is 445 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024960?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024960", "SL024960" ], "locale_variants": {} }, { "sku": "SL185060-TB", "brand": "FAG", "manufacturer_designation": "SL185060-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3450, "static_load_kN": 6600, "fatigue_load_limit_kN": 670, "limiting_speed_rpm": 800, "max_rpm": 800, "reference_speed_rpm": 395, "weight_g": 124000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 300×460×218 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 3450 kN and C0 6600 kN; with a C/C0 ratio of 0.52 the 218 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 670 kN, the limiting speed 800 r/min and the thermal reference speed 395 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 11.50 kN per millimetre of the 300 mm bore and 15.83 kN per millimetre of the 218 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 124 kg (124000 g) (1.24 g per mm² of the 460×218 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 300 mm bore, 460 mm outside diameter: at this size the 6600 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Full-complement kinematics cap the speed at 800 r/min (reference 395 r/min); below that limit the double-row pack offers exceptional stiffness for its section At 124 kg (124000 g), this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints The -TB feature concerns the rib contact, not the envelope: the 300×460×218 mm dimensions and 124 kg mass follow the standard series plan. Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 460 mm outside diameter and 3450 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 300 mm seat, and in marine and offshore winch arrangements the 124 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 218 mm width and the published 6600 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL185060-TB?", "a": "The SL185060-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 460 mm outside diameter, 300 mm bore and 218 mm width, envelope 300×460×218 mm. Mass is 124 kg." }, { "q": "What does the SL185060-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185060-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 300×460×218 mm and the catalogue ratings are C 3450 kN, C0 6600 kN, Cur 670 kN." }, { "q": "What is the load capacity of the SL185060-TB?", "a": "The basic dynamic load rating C is 3450 kN and the basic static load rating C0 is 6600 kN; the fatigue load limit Cur is 670 kN." }, { "q": "What is the maximum speed of the SL185060-TB?", "a": "The limiting speed is 800 r/min and the thermal reference speed is 395 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185060-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185060", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=553", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185060-TB", "SL185060-TB" ], "locale_variants": {} }, { "sku": "SL014964", "brand": "FAG", "manufacturer_designation": "SL014964", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1700, "static_load_kN": 4050, "fatigue_load_limit_kN": 435, "limiting_speed_rpm": 800, "max_rpm": 800, "reference_speed_rpm": 395, "weight_g": 56000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 320×440×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1700 kN and C0 4050 kN; with a C/C0 ratio of 0.42 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 435 kN, the limiting speed 800 r/min and the thermal reference speed 395 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.31 kN per millimetre of the 320 mm bore and 14.41 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 56 kg (56000 g) (1.08 g per mm² of the 440×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 320 mm bore this is among the largest catalogue sizes; the 800 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The locating structure has an axially split outer ring with ribs on both sides, joined by retaining rings, and an inner ring with a centre rib — the 118 mm width houses two complete roller rows Typical applications include heavy industrial gearbox shafts, crane travelling-wheel mechanisms and vibrating and oscillating machinery, where the 440 mm outside diameter and 1700 kN dynamic rating match the duty. In heavy industrial gearbox shafts the unit fits a compact 320 mm seat, and in crane travelling-wheel mechanisms the 56 kg mass is part of the rotor inertia calculation. Designers also specify it for vibrating and oscillating machinery, relying on the 118 mm width and the published 4050 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "applications": [ "heavy industrial gearbox shafts", "construction machinery slewing drives", "vibrating and oscillating machinery", "rope drums and winch drums" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL014964?", "a": "The SL014964 is a SL0149 double-row full-complement locating cylindrical roller bearing with 440 mm outside diameter, 320 mm bore and 118 mm width, envelope 320×440×118 mm. Mass is 56 kg." }, { "q": "What does the SL014964 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014964 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 320×440×118 mm and the catalogue ratings are C 1700 kN, C0 4050 kN, Cur 435 kN." }, { "q": "What is the load capacity of the SL014964?", "a": "The basic dynamic load rating C is 1700 kN and the basic static load rating C0 is 4050 kN; the fatigue load limit Cur is 435 kN." }, { "q": "What is the maximum speed of the SL014964?", "a": "The limiting speed is 800 r/min and the thermal reference speed is 395 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014964?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014964", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014964", "SL014964" ], "locale_variants": {} }, { "sku": "SL024964", "brand": "FAG", "manufacturer_designation": "SL024964", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1700, "static_load_kN": 4050, "fatigue_load_limit_kN": 435, "limiting_speed_rpm": 800, "max_rpm": 800, "reference_speed_rpm": 395, "weight_g": 54900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 320×440×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1700 kN and C0 4050 kN; with a C/C0 ratio of 0.42 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 435 kN, the limiting speed 800 r/min and the thermal reference speed 395 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.31 kN per millimetre of the 320 mm bore and 14.41 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 54.9 kg (54900 g) (1.06 g per mm² of the 440×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 320 mm bore this is among the largest catalogue sizes; the 800 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft Typical applications include vibrating and oscillating machinery, heavy industrial gearbox shafts and rope drums and winch drums, where the 440 mm outside diameter and 1700 kN dynamic rating match the duty. In vibrating and oscillating machinery the unit fits a compact 320 mm seat, and in heavy industrial gearbox shafts the 54.9 kg mass is part of the rotor inertia calculation. Designers also specify it for rope drums and winch drums, relying on the 118 mm width and the published 4050 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "rope drums and winch drums", "compact slow-speed agitator drives", "marine and offshore winch arrangements", "hydraulic pumps and radial piston pumps" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL024964?", "a": "The SL024964 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 440 mm outside diameter, 320 mm bore and 118 mm width, envelope 320×440×118 mm. Mass is 54.9 kg." }, { "q": "What does the SL024964 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024964 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 320×440×118 mm and the catalogue ratings are C 1700 kN, C0 4050 kN, Cur 435 kN." }, { "q": "What is the load capacity of the SL024964?", "a": "The basic dynamic load rating C is 1700 kN and the basic static load rating C0 is 4050 kN; the fatigue load limit Cur is 435 kN." }, { "q": "What is the maximum speed of the SL024964?", "a": "The limiting speed is 800 r/min and the thermal reference speed is 395 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024964?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024964", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024964", "SL024964" ], "locale_variants": {} }, { "sku": "SL185064-TB", "brand": "FAG", "manufacturer_designation": "SL185064-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3550, "static_load_kN": 6900, "fatigue_load_limit_kN": 700, "limiting_speed_rpm": 770, "max_rpm": 770, "reference_speed_rpm": 375, "weight_g": 128400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 320×480×218 mm with a 80.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 3550 kN and C0 6900 kN; with a C/C0 ratio of 0.51 the 218 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 700 kN, the limiting speed 770 r/min and the thermal reference speed 375 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 11.09 kN per millimetre of the 320 mm bore and 16.28 kN per millimetre of the 218 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 128.4 kg (128400 g) (1.23 g per mm² of the 480×218 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 320 mm bore, 480 mm outside diameter: at this size the 6900 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 320 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other The semi-locating SL1850 structure uses inner-ring ribs with a retaining ring on the flangeless side; it carries high radial loads plus axial load in one direction, which is why it often pairs with an SL0149 locating bearing -TB marks the TB execution with higher permissible axial load — the improved roller-end/rib lubrication film carries more thrust than the standard full-complement design. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 480 mm outside diameter and 3550 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 320 mm seat, and in vibrating and oscillating machinery the 128.4 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 218 mm width and the published 6900 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL185064-TB?", "a": "The SL185064-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 480 mm outside diameter, 320 mm bore and 218 mm width, envelope 320×480×218 mm. Mass is 128.4 kg." }, { "q": "What does the SL185064-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185064-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 320×480×218 mm and the catalogue ratings are C 3550 kN, C0 6900 kN, Cur 700 kN." }, { "q": "What is the load capacity of the SL185064-TB?", "a": "The basic dynamic load rating C is 3550 kN and the basic static load rating C0 is 6900 kN; the fatigue load limit Cur is 700 kN." }, { "q": "What is the maximum speed of the SL185064-TB?", "a": "The limiting speed is 770 r/min and the thermal reference speed is 375 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185064-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185064", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185064-TB", "SL185064-TB" ], "locale_variants": {} }, { "sku": "SL014968", "brand": "FAG", "manufacturer_designation": "SL014968", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1750, "static_load_kN": 4250, "fatigue_load_limit_kN": 450, "limiting_speed_rpm": 770, "max_rpm": 770, "reference_speed_rpm": 375, "weight_g": 59000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 340×460×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1750 kN and C0 4250 kN; with a C/C0 ratio of 0.41 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 450 kN, the limiting speed 770 r/min and the thermal reference speed 375 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.15 kN per millimetre of the 340 mm bore and 14.83 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 59 kg (59000 g) (1.09 g per mm² of the 460×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 340 mm bore, 460 mm outside diameter: at this size the 4250 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The outer ring carries an annular lubrication groove and holes, so the 1750 kN dynamic rating can be maintained with relubrication without dismounting the 59 kg unit Reading SL0149: the DIN 5412-9 type code family NNC49, double-row full complement with split outer ring; the joining retaining rings must not be used to transmit axial force Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 460 mm outside diameter and 1750 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 340 mm seat, and in material handling conveyor pulleys the 59 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 118 mm width and the published 4250 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "planetary gear bearing positions", "hydraulic pumps and radial piston pumps", "compact slow-speed agitator drives", "crane travelling-wheel mechanisms" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL014968?", "a": "The SL014968 is a SL0149 double-row full-complement locating cylindrical roller bearing with 460 mm outside diameter, 340 mm bore and 118 mm width, envelope 340×460×118 mm. Mass is 59 kg." }, { "q": "What does the SL014968 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014968 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 340×460×118 mm and the catalogue ratings are C 1750 kN, C0 4250 kN, Cur 450 kN." }, { "q": "What is the load capacity of the SL014968?", "a": "The basic dynamic load rating C is 1750 kN and the basic static load rating C0 is 4250 kN; the fatigue load limit Cur is 450 kN." }, { "q": "What is the maximum speed of the SL014968?", "a": "The limiting speed is 770 r/min and the thermal reference speed is 375 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014968?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014968", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014968", "SL014968" ], "locale_variants": {} }, { "sku": "SL024968", "brand": "FAG", "manufacturer_designation": "SL024968", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1750, "static_load_kN": 4250, "fatigue_load_limit_kN": 450, "limiting_speed_rpm": 770, "max_rpm": 770, "reference_speed_rpm": 375, "weight_g": 57800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 340×460×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1750 kN and C0 4250 kN; with a C/C0 ratio of 0.41 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 450 kN, the limiting speed 770 r/min and the thermal reference speed 375 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.15 kN per millimetre of the 340 mm bore and 14.83 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 57.8 kg (57800 g) (1.06 g per mm² of the 460×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 340 mm bore, 460 mm outside diameter: at this size the 4250 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs At 340 mm bore and 57.8 kg, the SL0249 is specified in rolling-mill gearboxes, travelling mechanisms and construction machinery where thermal shaft growth must not induce thrust The cageless double pack is speed-limited to 770 r/min (reference 375 r/min) but accepts purely radial loads with the rigidity required in heavy industrial gearboxes Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 460 mm outside diameter and 1750 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 340 mm seat, and in construction machinery slewing drives the 57.8 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 118 mm width and the published 4250 kN static rating. Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL024968?", "a": "The SL024968 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 460 mm outside diameter, 340 mm bore and 118 mm width, envelope 340×460×118 mm. Mass is 57.8 kg." }, { "q": "What does the SL024968 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024968 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 340×460×118 mm and the catalogue ratings are C 1750 kN, C0 4250 kN, Cur 450 kN." }, { "q": "What is the load capacity of the SL024968?", "a": "The basic dynamic load rating C is 1750 kN and the basic static load rating C0 is 4250 kN; the fatigue load limit Cur is 450 kN." }, { "q": "What is the maximum speed of the SL024968?", "a": "The limiting speed is 770 r/min and the thermal reference speed is 375 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024968?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024968", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024968", "SL024968" ], "locale_variants": {} }, { "sku": "SL185068-TB", "brand": "FAG", "manufacturer_designation": "SL185068-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 520, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4250, "static_load_kN": 8300, "fatigue_load_limit_kN": 810, "limiting_speed_rpm": 710, "max_rpm": 710, "reference_speed_rpm": 335, "weight_g": 178000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 340×520×243 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 4250 kN and C0 8300 kN; with a C/C0 ratio of 0.51 the 243 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 810 kN, the limiting speed 710 r/min and the thermal reference speed 335 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 12.50 kN per millimetre of the 340 mm bore and 17.49 kN per millimetre of the 243 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 178 kg (178000 g) (1.41 g per mm² of the 520×243 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 340 mm bore this is among the largest catalogue sizes; the 710 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Full-complement kinematics cap the speed at 710 r/min (reference 335 r/min); below that limit the double-row pack offers exceptional stiffness for its section The SL1850 tolerates no angular misalignment — the two roller rows distribute load only when shaft and housing axes are parallel, so housing bore alignment is a mounting requirement The -TB feature concerns the rib contact, not the envelope: the 340×520×243 mm dimensions and 178 kg mass follow the standard series plan. Typical applications include material handling conveyor pulleys, rolling-mill and steel-industry drives and construction machinery slewing drives, where the 520 mm outside diameter and 4250 kN dynamic rating match the duty. In material handling conveyor pulleys the unit fits a compact 340 mm seat, and in rolling-mill and steel-industry drives the 178 kg mass is part of the rotor inertia calculation. Designers also specify it for construction machinery slewing drives, relying on the 243 mm width and the published 8300 kN static rating. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL185068-TB?", "a": "The SL185068-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 520 mm outside diameter, 340 mm bore and 243 mm width, envelope 340×520×243 mm. Mass is 178 kg." }, { "q": "What does the SL185068-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185068-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 340×520×243 mm and the catalogue ratings are C 4250 kN, C0 8300 kN, Cur 810 kN." }, { "q": "What is the load capacity of the SL185068-TB?", "a": "The basic dynamic load rating C is 4250 kN and the basic static load rating C0 is 8300 kN; the fatigue load limit Cur is 810 kN." }, { "q": "What is the maximum speed of the SL185068-TB?", "a": "The limiting speed is 710 r/min and the thermal reference speed is 335 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185068-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185068", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185068-TB", "SL185068-TB" ], "locale_variants": {} }, { "sku": "SL014972", "brand": "FAG", "manufacturer_designation": "SL014972", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1790, "static_load_kN": 4450, "fatigue_load_limit_kN": 465, "limiting_speed_rpm": 730, "max_rpm": 730, "reference_speed_rpm": 350, "weight_g": 62100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 360×480×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 1790 kN and C0 4450 kN; with a C/C0 ratio of 0.40 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 465 kN, the limiting speed 730 r/min and the thermal reference speed 350 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 4.97 kN per millimetre of the 360 mm bore and 15.17 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 62.1 kg (62100 g) (1.10 g per mm² of the 480×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 360 mm bore puts this execution at the top of the HR1 range — the 480 mm outside diameter, 118 mm width and 62.1 kg mass are built for primary-industry load cases As the fixed (locating) bearing it takes the thermal-expansion thrust from the shaft while the paired floating bearing moves; the limiting speed here is 730 r/min No angular compensation is built in: misalignment loads one roller row preferentially, so the housing and shaft seats for a 360 mm bore SL0149 must be machined parallel Typical applications include construction machinery slewing drives, material handling conveyor pulleys and planetary gear bearing positions, where the 480 mm outside diameter and 1790 kN dynamic rating match the duty. In construction machinery slewing drives the unit fits a compact 360 mm seat, and in material handling conveyor pulleys the 62.1 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearing positions, relying on the 118 mm width and the published 4450 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "compact slow-speed agitator drives", "rolling-mill and steel-industry drives", "crane travelling-wheel mechanisms", "heavy industrial gearbox shafts" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL014972?", "a": "The SL014972 is a SL0149 double-row full-complement locating cylindrical roller bearing with 480 mm outside diameter, 360 mm bore and 118 mm width, envelope 360×480×118 mm. Mass is 62.1 kg." }, { "q": "What does the SL014972 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014972 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 360×480×118 mm and the catalogue ratings are C 1790 kN, C0 4450 kN, Cur 465 kN." }, { "q": "What is the load capacity of the SL014972?", "a": "The basic dynamic load rating C is 1790 kN and the basic static load rating C0 is 4450 kN; the fatigue load limit Cur is 465 kN." }, { "q": "What is the maximum speed of the SL014972?", "a": "The limiting speed is 730 r/min and the thermal reference speed is 350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014972?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014972", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014972", "SL014972" ], "locale_variants": {} }, { "sku": "SL024972", "brand": "FAG", "manufacturer_designation": "SL024972", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2020, "static_load_kN": 4450, "fatigue_load_limit_kN": 570, "limiting_speed_rpm": 730, "max_rpm": 730, "reference_speed_rpm": 350, "weight_g": 60800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 360×480×118 mm with a 60.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2020 kN and C0 4450 kN; with a C/C0 ratio of 0.45 the 118 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 570 kN, the limiting speed 730 r/min and the thermal reference speed 350 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.61 kN per millimetre of the 360 mm bore and 17.12 kN per millimetre of the 118 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 60.8 kg (60800 g) (1.07 g per mm² of the 480×118 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 360 mm bore puts this execution at the top of the HR1 range — the 480 mm outside diameter, 118 mm width and 60.8 kg mass are built for primary-industry load cases The cageless double pack is speed-limited to 730 r/min (reference 350 r/min) but accepts purely radial loads with the rigidity required in heavy industrial gearboxes At 360 mm bore and 60.8 kg, the SL0249 is specified in rolling-mill gearboxes, travelling mechanisms and construction machinery where thermal shaft growth must not induce thrust Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 480 mm outside diameter and 2020 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 360 mm seat, and in construction machinery slewing drives the 60.8 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 118 mm width and the published 4450 kN static rating. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "Use the rib structure correctly: SL18/SL1850 give one-direction axial guidance, SL0149 locates both ways and SL0249 floats — pairing two locating bearings on one shaft binds thermal growth." ], "faq": [ { "q": "What are the dimensions of the SL024972?", "a": "The SL024972 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 480 mm outside diameter, 360 mm bore and 118 mm width, envelope 360×480×118 mm. Mass is 60.8 kg." }, { "q": "What does the SL024972 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024972 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 360×480×118 mm and the catalogue ratings are C 2020 kN, C0 4450 kN, Cur 570 kN." }, { "q": "What is the load capacity of the SL024972?", "a": "The basic dynamic load rating C is 2020 kN and the basic static load rating C0 is 4450 kN; the fatigue load limit Cur is 570 kN." }, { "q": "What is the maximum speed of the SL024972?", "a": "The limiting speed is 730 r/min and the thermal reference speed is 350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024972?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024972", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024972", "SL024972" ], "locale_variants": {} }, { "sku": "SL185072-TB", "brand": "FAG", "manufacturer_designation": "SL185072-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 540, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4400, "static_load_kN": 8700, "fatigue_load_limit_kN": 840, "limiting_speed_rpm": 680, "max_rpm": 680, "reference_speed_rpm": 320, "weight_g": 178000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 360×540×243 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 4400 kN and C0 8700 kN; with a C/C0 ratio of 0.51 the 243 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 840 kN, the limiting speed 680 r/min and the thermal reference speed 320 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 12.22 kN per millimetre of the 360 mm bore and 18.11 kN per millimetre of the 243 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 178 kg (178000 g) (1.36 g per mm² of the 540×243 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 360 mm bore, 540 mm outside diameter: at this size the 8700 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs At 178 kg (178000 g), this is a rigid machine element used in rolling stands, crane wheels, winches and planetary stages with tight envelope constraints Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes Reading -TB: Schaeffler's enhanced-rib design for full-complement bearings; axial friction torque is reduced while radial ratings stay at 4400 kN C. Typical applications include planetary gear bearing positions, construction machinery slewing drives and compact slow-speed agitator drives, where the 540 mm outside diameter and 4400 kN dynamic rating match the duty. In planetary gear bearing positions the unit fits a compact 360 mm seat, and in construction machinery slewing drives the 178 kg mass is part of the rotor inertia calculation. Designers also specify it for compact slow-speed agitator drives, relying on the 243 mm width and the published 8700 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "applications": [ "vibrating and oscillating machinery", "planetary gear bearing positions", "rope drums and winch drums", "marine and offshore winch arrangements" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design." ], "faq": [ { "q": "What are the dimensions of the SL185072-TB?", "a": "The SL185072-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 540 mm outside diameter, 360 mm bore and 243 mm width, envelope 360×540×243 mm. Mass is 178 kg." }, { "q": "What does the SL185072-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185072-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 360×540×243 mm and the catalogue ratings are C 4400 kN, C0 8700 kN, Cur 840 kN." }, { "q": "What is the load capacity of the SL185072-TB?", "a": "The basic dynamic load rating C is 4400 kN and the basic static load rating C0 is 8700 kN; the fatigue load limit Cur is 840 kN." }, { "q": "What is the maximum speed of the SL185072-TB?", "a": "The limiting speed is 680 r/min and the thermal reference speed is 320 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185072-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185072-TB", "SL185072-TB" ], "locale_variants": {} }, { "sku": "SL014976", "brand": "FAG", "manufacturer_designation": "SL014976", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2250, "static_load_kN": 5500, "fatigue_load_limit_kN": 590, "limiting_speed_rpm": 680, "max_rpm": 680, "reference_speed_rpm": 325, "weight_g": 92400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 380×520×140 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2250 kN and C0 5500 kN; with a C/C0 ratio of 0.41 the 140 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 590 kN, the limiting speed 680 r/min and the thermal reference speed 325 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.92 kN per millimetre of the 380 mm bore and 16.07 kN per millimetre of the 140 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 92.4 kg (92400 g) (1.27 g per mm² of the 520×140 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads the 380 mm bore puts this execution at the top of the HR1 range — the 520 mm outside diameter, 140 mm width and 92.4 kg mass are built for primary-industry load cases The outer ring carries an annular lubrication groove and holes, so the 2250 kN dynamic rating can be maintained with relubrication without dismounting the 92.4 kg unit Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 520 mm outside diameter and 2250 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 380 mm seat, and in vibrating and oscillating machinery the 92.4 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 140 mm width and the published 5500 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "C0 is the number that tempts overload in slow machinery, but fatigue life is still governed by the dynamic C rating and lubricant film.", "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling." ], "faq": [ { "q": "What are the dimensions of the SL014976?", "a": "The SL014976 is a SL0149 double-row full-complement locating cylindrical roller bearing with 520 mm outside diameter, 380 mm bore and 140 mm width, envelope 380×520×140 mm. Mass is 92.4 kg." }, { "q": "What does the SL014976 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014976 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 380×520×140 mm and the catalogue ratings are C 2250 kN, C0 5500 kN, Cur 590 kN." }, { "q": "What is the load capacity of the SL014976?", "a": "The basic dynamic load rating C is 2250 kN and the basic static load rating C0 is 5500 kN; the fatigue load limit Cur is 590 kN." }, { "q": "What is the maximum speed of the SL014976?", "a": "The limiting speed is 680 r/min and the thermal reference speed is 325 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014976?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014976", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014976", "SL014976" ], "locale_variants": {} }, { "sku": "SL024976", "brand": "FAG", "manufacturer_designation": "SL024976", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2250, "static_load_kN": 5500, "fatigue_load_limit_kN": 590, "limiting_speed_rpm": 680, "max_rpm": 680, "reference_speed_rpm": 325, "weight_g": 90500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 380×520×140 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2250 kN and C0 5500 kN; with a C/C0 ratio of 0.41 the 140 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 590 kN, the limiting speed 680 r/min and the thermal reference speed 325 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.92 kN per millimetre of the 380 mm bore and 16.07 kN per millimetre of the 140 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 90.5 kg (90500 g) (1.24 g per mm² of the 520×140 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 380 mm bore this is among the largest catalogue sizes; the 680 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading SL0249: the DIN 5412-9 type code family NNCL49 — double row, no cage, flangeless outer ring; the open design is relubricated through groove and holes in the outer ring Typical applications include hydraulic pumps and radial piston pumps, marine and offshore winch arrangements and rolling-mill and steel-industry drives, where the 520 mm outside diameter and 2250 kN dynamic rating match the duty. In hydraulic pumps and radial piston pumps the unit fits a compact 380 mm seat, and in marine and offshore winch arrangements the 90.5 kg mass is part of the rotor inertia calculation. Designers also specify it for rolling-mill and steel-industry drives, relying on the 140 mm width and the published 5500 kN static rating. Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "marine and offshore winch arrangements", "crane travelling-wheel mechanisms", "hydraulic pumps and radial piston pumps", "rolling-mill and steel-industry drives" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "Relubrication paths matter: specify the annular groove/hole executions where access is poor, because the tightly packed rows trap old grease." ], "faq": [ { "q": "What are the dimensions of the SL024976?", "a": "The SL024976 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 520 mm outside diameter, 380 mm bore and 140 mm width, envelope 380×520×140 mm. Mass is 90.5 kg." }, { "q": "What does the SL024976 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024976 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 380×520×140 mm and the catalogue ratings are C 2250 kN, C0 5500 kN, Cur 590 kN." }, { "q": "What is the load capacity of the SL024976?", "a": "The basic dynamic load rating C is 2250 kN and the basic static load rating C0 is 5500 kN; the fatigue load limit Cur is 590 kN." }, { "q": "What is the maximum speed of the SL024976?", "a": "The limiting speed is 680 r/min and the thermal reference speed is 325 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024976?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024976", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024976", "SL024976" ], "locale_variants": {} }, { "sku": "SL185076-TB", "brand": "FAG", "manufacturer_designation": "SL185076-TB", "series": "sl1850-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4450, "static_load_kN": 8900, "fatigue_load_limit_kN": 860, "limiting_speed_rpm": 660, "max_rpm": 660, "reference_speed_rpm": 305, "weight_g": 196500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 380×560×243 mm with a 90.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 4450 kN and C0 8900 kN; with a C/C0 ratio of 0.50 the 243 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 860 kN, the limiting speed 660 r/min and the thermal reference speed 305 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 11.71 kN per millimetre of the 380 mm bore and 18.31 kN per millimetre of the 243 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 196.5 kg (196500 g) (1.44 g per mm² of the 560×243 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads 380 mm bore, 560 mm outside diameter: at this size the 8900 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading SL1850: dimension series 50, double row, no cage; the bearing is supplied with annular lubrication features and is intended for oil or grease lubrication in heavy gearboxes SL1850 denotes the double-row full-complement semi-locating bearing: two roller rows share the 380 mm bore, and the arrangement guides the shaft axially in one direction while allowing displacement s in the other TB-design bearings use revised roller-end curvature to protect the ribs under combined load — relevant at 380 mm bore where the semi-locating function carries real thrust. Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 560 mm outside diameter and 4450 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 380 mm seat, and in vibrating and oscillating machinery the 196.5 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 243 mm width and the published 8900 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "applications": [ "hydraulic pumps and radial piston pumps", "heavy industrial gearbox shafts", "rolling-mill and steel-industry drives", "material handling conveyor pulleys" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "The split outer ring of SL0149 is joined by retaining rings for handling only; never use those rings as a thrust face in the design.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact." ], "faq": [ { "q": "What are the dimensions of the SL185076-TB?", "a": "The SL185076-TB is a SL1850 double-row full-complement semi-locating cylindrical roller bearing with 560 mm outside diameter, 380 mm bore and 243 mm width, envelope 380×560×243 mm. Mass is 196.5 kg." }, { "q": "What does the SL185076-TB designation mean in the FAG/INA HR1 catalogue?", "a": "SL185076-TB identifies this SL1850 double-row full-complement semi-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 380×560×243 mm and the catalogue ratings are C 4450 kN, C0 8900 kN, Cur 860 kN." }, { "q": "What is the load capacity of the SL185076-TB?", "a": "The basic dynamic load rating C is 4450 kN and the basic static load rating C0 is 8900 kN; the fatigue load limit Cur is 860 kN." }, { "q": "What is the maximum speed of the SL185076-TB?", "a": "The limiting speed is 660 r/min and the thermal reference speed is 305 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL185076-TB?", "a": "The SL1850 is semi-locating: it carries axial load in one direction and permits the catalogue s-displacement in the other." } ], "cross_ref": [ { "equiv_sku": "SL185076", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL185076-TB", "SL185076-TB" ], "locale_variants": {} }, { "sku": "SL014980", "brand": "FAG", "manufacturer_designation": "SL014980", "series": "sl0149-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2310, "static_load_kN": 5800, "fatigue_load_limit_kN": 610, "limiting_speed_rpm": 650, "max_rpm": 650, "reference_speed_rpm": 300, "weight_g": 96500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 400×540×140 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2310 kN and C0 5800 kN; with a C/C0 ratio of 0.40 the 140 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 610 kN, the limiting speed 650 r/min and the thermal reference speed 300 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.78 kN per millimetre of the 400 mm bore and 16.50 kN per millimetre of the 140 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 96.5 kg (96500 g) (1.28 g per mm² of the 540×140 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 400 mm bore this is among the largest catalogue sizes; the 650 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL0149 is the double-row full-complement locating bearing: it supports the radial load and axial loads in both directions, fixing the shaft axially at that position As the fixed (locating) bearing it takes the thermal-expansion thrust from the shaft while the paired floating bearing moves; the limiting speed here is 650 r/min Typical applications include rope drums and winch drums, vibrating and oscillating machinery and marine and offshore winch arrangements, where the 540 mm outside diameter and 2310 kN dynamic rating match the duty. In rope drums and winch drums the unit fits a compact 400 mm seat, and in vibrating and oscillating machinery the 96.5 kg mass is part of the rotor inertia calculation. Designers also specify it for marine and offshore winch arrangements, relying on the 140 mm width and the published 5800 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "material handling conveyor pulleys", "rope drums and winch drums", "construction machinery slewing drives", "planetary gear bearing positions" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL014980?", "a": "The SL014980 is a SL0149 double-row full-complement locating cylindrical roller bearing with 540 mm outside diameter, 400 mm bore and 140 mm width, envelope 400×540×140 mm. Mass is 96.5 kg." }, { "q": "What does the SL014980 designation mean in the FAG/INA HR1 catalogue?", "a": "SL014980 identifies this SL0149 double-row full-complement locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 400×540×140 mm and the catalogue ratings are C 2310 kN, C0 5800 kN, Cur 610 kN." }, { "q": "What is the load capacity of the SL014980?", "a": "The basic dynamic load rating C is 2310 kN and the basic static load rating C0 is 5800 kN; the fatigue load limit Cur is 610 kN." }, { "q": "What is the maximum speed of the SL014980?", "a": "The limiting speed is 650 r/min and the thermal reference speed is 300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL014980?", "a": "The SL0149 is a locating bearing: it fixes the shaft axially in both directions; pair it with a non-locating SL0249 at the other end to avoid binding." } ], "cross_ref": [ { "equiv_sku": "SL014980", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL014980", "SL014980" ], "locale_variants": {} }, { "sku": "SL024980", "brand": "FAG", "manufacturer_designation": "SL024980", "series": "sl0249-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2310, "static_load_kN": 5800, "fatigue_load_limit_kN": 610, "limiting_speed_rpm": 650, "max_rpm": 650, "reference_speed_rpm": 300, "weight_g": 94600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 400×540×140 mm with a 70.0 mm radial section; every available circumferential space carries a roller because there is no cage C is 2310 kN and C0 5800 kN; with a C/C0 ratio of 0.40 the 140 mm-wide full complement concentrates on extreme static and steady radial capacity rather than speed the fatigue load limit Cur is 610 kN, the limiting speed 650 r/min and the thermal reference speed 300 r/min — full-complement roller-to-roller contact keeps both speeds well below caged cylindrical bearings of the same size the dynamic rating is 5.78 kN per millimetre of the 400 mm bore and 16.50 kN per millimetre of the 140 mm width, figures that explain the use of this bearing in compact, heavily loaded gearbox positions mass is 94.6 kg (94600 g) (1.25 g per mm² of the 540×140 mm envelope); the stiff, thick rings keep raceway deformation low under peak loads at 400 mm bore this is among the largest catalogue sizes; the 650 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position SL0249 is the double-row full-complement non-locating (floating) bearing: the flangeless outer ring moves freely over the rollers, taking only radial load while a separate bearing locates the shaft The cageless double pack is speed-limited to 650 r/min (reference 300 r/min) but accepts purely radial loads with the rigidity required in heavy industrial gearboxes Typical applications include marine and offshore winch arrangements, rope drums and winch drums and hydraulic pumps and radial piston pumps, where the 540 mm outside diameter and 2310 kN dynamic rating match the duty. In marine and offshore winch arrangements the unit fits a compact 400 mm seat, and in rope drums and winch drums the 94.6 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic pumps and radial piston pumps, relying on the 140 mm width and the published 5800 kN static rating. The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling. There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "applications": [ "crane travelling-wheel mechanisms", "material handling conveyor pulleys", "heavy industrial gearbox shafts", "vibrating and oscillating machinery" ], "failure_modes": [ "raceway pitting from overloaded slow-speed positions where the cageless rollers repeatedly stress one contact band", "rib and roller-end scoring when applied axial thrust exceeds the semi-locating capacity", "roller smearing from roller-to-roller sliding at speeds above the limiting value", "edge loading and premature spalling caused by undetected shaft/housing misalignment (full-complement rows cannot self-align)", "brinelling of the raceways from static shock during mounting or transport of the heavy rotor", "lubricant starvation in the tightly packed roller set, especially in the double-row executions", "freting and creep on a loose ring seat under a rotating load", "contamination wear in open gearbox positions with damaged seals or breathers", "false brinelling from micro-movement while the shaft is stationary under vibration" ], "pitfalls": [ "The bearings cannot accommodate angular misalignment; check shaft and housing parallelism before blaming the bearing for edge spalling.", "There is no cage: do not apply caged-bearing speed rules — the printed limiting speed is a hard kinematic ceiling set by roller-to-roller contact.", "Press-fit the correct ring: the rotating ring needs interference while the floating ring must slide on its seat to perform the non-locating function." ], "faq": [ { "q": "What are the dimensions of the SL024980?", "a": "The SL024980 is a SL0249 double-row full-complement non-locating cylindrical roller bearing with 540 mm outside diameter, 400 mm bore and 140 mm width, envelope 400×540×140 mm. Mass is 94.6 kg." }, { "q": "What does the SL024980 designation mean in the FAG/INA HR1 catalogue?", "a": "SL024980 identifies this SL0249 double-row full-complement non-locating cylindrical roller bearing in the Schaeffler HR1 rolling bearings catalogue. The envelope is 400×540×140 mm and the catalogue ratings are C 2310 kN, C0 5800 kN, Cur 610 kN." }, { "q": "What is the load capacity of the SL024980?", "a": "The basic dynamic load rating C is 2310 kN and the basic static load rating C0 is 5800 kN; the fatigue load limit Cur is 610 kN." }, { "q": "What is the maximum speed of the SL024980?", "a": "The limiting speed is 650 r/min and the thermal reference speed is 300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "What is the locating function of the SL024980?", "a": "The SL0249 is non-locating: the flangeless outer ring floats freely and takes radial load only, making it the standard partner for a locating SL0149." } ], "cross_ref": [ { "equiv_sku": "SL024980", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=555", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "SL024980", "SL024980" ], "locale_variants": {} }, { "sku": "NK5-10-TV-XL", "brand": "FAG", "manufacturer_designation": "NK5/10-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 5, "D_mm": 10, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 2.65, "static_load_kN": 1.92, "fatigue_load_limit_kN": 0.3, "limiting_speed_rpm": 39000, "max_rpm": 39000, "reference_speed_rpm": 55000, "weight_g": 3.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×10×10 mm: 5 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 2.5 mm radial section packed with small-diameter needle rollers C is 2.65 kN and C0 1.92 kN at the 5 mm seat; the C/C0 ratio of 1.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 10 mm outside diameter the fatigue load limit Cur is 0.3 kN, the limiting speed 39,000 r/min and the thermal reference speed 55,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.53 kN/mm and per millimetre of width 0.27 kN/mm — the reason 10 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.1 g, just 0.03 g per mm² of projected 10×10 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 5 mm bore this is one of the smallest HR1 executions — chosen where a 10 mm envelope must carry line-contact loads that no miniature ball bearing could take Omitting the inner ring frees radial space — at a 5 mm shaft the outer diameter is only 10 mm and the width 10 mm, yet C is 2.65 kN The thin 2.5 mm section makes the 3.1 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 39,000 r/min limit. With the -TV polyamide cage the rollers are positively separated, so the 5 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 10 mm outside diameter and 2.65 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 5 mm seat, and in agricultural machine pivots and linkages the 3.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 10 mm width and the published 1.92 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK5/10-TV-XL?", "a": "The NK5/10-TV-XL is a NK machined-ring needle roller bearing without inner ring with 10 mm outside diameter, 5 mm bore and 10 mm width, envelope 5×10×10 mm. Mass is 3.1 g." }, { "q": "What does the NK5/10-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK5/10-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 5×10×10 mm and the catalogue ratings are C 2.65 kN, C0 1.92 kN, Cur 0.3 kN." }, { "q": "What is the load capacity of the NK5/10-TV-XL?", "a": "The basic dynamic load rating C is 2.65 kN and the basic static load rating C0 is 1.92 kN; the fatigue load limit Cur is 0.3 kN." }, { "q": "What is the maximum speed of the NK5/10-TV-XL?", "a": "The limiting speed is 39,000 r/min and the thermal reference speed is 55,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK5/10-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK5/10-TV-XL has no inner ring, so the 5 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK5-10-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 5×10×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK5-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK5-10-TV-XL", "NK5/10-TV-XL" ], "locale_variants": {} }, { "sku": "NK5-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NK5/12-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 5, "D_mm": 10, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 3.4, "static_load_kN": 2.65, "fatigue_load_limit_kN": 0.44, "limiting_speed_rpm": 39000, "max_rpm": 39000, "reference_speed_rpm": 54000, "weight_g": 3.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×10×12 mm: 5 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 2.5 mm radial section packed with small-diameter needle rollers C is 3.4 kN and C0 2.65 kN at the 5 mm seat; the C/C0 ratio of 1.28 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 10 mm outside diameter the fatigue load limit Cur is 0.44 kN, the limiting speed 39,000 r/min and the thermal reference speed 54,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.68 kN/mm and per millimetre of width 0.28 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.7 g, just 0.03 g per mm² of projected 10×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 5 mm bore and only 3.7 g: the smallest sizes demand accurate shaft geometry, because the 2.5 mm section leaves no tolerance for a soft or tapered seat The thin 2.5 mm section makes the 3.7 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 5×10×12 mm envelope. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 3.7 g in the 10 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 10 mm outside diameter and 3.4 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 5 mm seat, and in two-stroke and compressor piston pins the 3.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 12 mm width and the published 2.65 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK5/12-TV-XL?", "a": "The NK5/12-TV-XL is a NK machined-ring needle roller bearing without inner ring with 10 mm outside diameter, 5 mm bore and 12 mm width, envelope 5×10×12 mm. Mass is 3.7 g." }, { "q": "What does the NK5/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK5/12-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 5×10×12 mm and the catalogue ratings are C 3.4 kN, C0 2.65 kN, Cur 0.44 kN." }, { "q": "What is the load capacity of the NK5/12-TV-XL?", "a": "The basic dynamic load rating C is 3.4 kN and the basic static load rating C0 is 2.65 kN; the fatigue load limit Cur is 0.44 kN." }, { "q": "What is the maximum speed of the NK5/12-TV-XL?", "a": "The limiting speed is 39,000 r/min and the thermal reference speed is 54,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK5/12-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK5/12-TV-XL has no inner ring, so the 5 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK5-10-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK5-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 5×10×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK5-12-TV-XL", "NK5/12-TV-XL" ], "locale_variants": {} }, { "sku": "NK6-10-TV-XL", "brand": "FAG", "manufacturer_designation": "NK6/10-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 6, "D_mm": 12, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 2.95, "static_load_kN": 2.28, "fatigue_load_limit_kN": 0.36, "limiting_speed_rpm": 36500, "max_rpm": 36500, "reference_speed_rpm": 48500, "weight_g": 4.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×12×10 mm: 6 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.0 mm radial section packed with small-diameter needle rollers C is 2.95 kN and C0 2.28 kN at the 6 mm seat; the C/C0 ratio of 1.29 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 12 mm outside diameter the fatigue load limit Cur is 0.36 kN, the limiting speed 36,500 r/min and the thermal reference speed 48,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.49 kN/mm and per millimetre of width 0.30 kN/mm — the reason 10 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 4.7 g, just 0.04 g per mm² of projected 12×10 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 6 mm bore and only 4.7 g: the smallest sizes demand accurate shaft geometry, because the 3.0 mm section leaves no tolerance for a soft or tapered seat The hardness requirement is unforgiving: below about 58 HRC the 6 mm journal brinels under the 2.28 kN static rating, and roughness above raceway finish accelerates roller wear Omitting the inner ring frees radial space — at a 6 mm shaft the outer diameter is only 12 mm and the width 10 mm, yet C is 2.95 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 2.95 kN C rating and longer nominal life come without an envelope change. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 36,500 r/min limiting speed without roller-to-roller sliding. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 12 mm outside diameter and 2.95 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 6 mm seat, and in motorcycle and light-vehicle transmissions the 4.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 10 mm width and the published 2.28 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK6/10-TV-XL?", "a": "The NK6/10-TV-XL is a NK machined-ring needle roller bearing without inner ring with 12 mm outside diameter, 6 mm bore and 10 mm width, envelope 6×12×10 mm. Mass is 4.7 g." }, { "q": "What does the NK6/10-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK6/10-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 6×12×10 mm and the catalogue ratings are C 2.95 kN, C0 2.28 kN, Cur 0.36 kN." }, { "q": "What is the load capacity of the NK6/10-TV-XL?", "a": "The basic dynamic load rating C is 2.95 kN and the basic static load rating C0 is 2.28 kN; the fatigue load limit Cur is 0.36 kN." }, { "q": "What is the maximum speed of the NK6/10-TV-XL?", "a": "The limiting speed is 36,500 r/min and the thermal reference speed is 48,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK6/10-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK6/10-TV-XL has no inner ring, so the 6 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK6-10-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 6×12×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK6-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK6-10-TV-XL", "NK6/10-TV-XL" ], "locale_variants": {} }, { "sku": "NK6-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NK6/12-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 6, "D_mm": 12, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 3.8, "static_load_kN": 3.15, "fatigue_load_limit_kN": 0.53, "limiting_speed_rpm": 36500, "max_rpm": 36500, "reference_speed_rpm": 47500, "weight_g": 5.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×12×12 mm: 6 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.0 mm radial section packed with small-diameter needle rollers C is 3.8 kN and C0 3.15 kN at the 6 mm seat; the C/C0 ratio of 1.21 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 12 mm outside diameter the fatigue load limit Cur is 0.53 kN, the limiting speed 36,500 r/min and the thermal reference speed 47,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.63 kN/mm and per millimetre of width 0.32 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.7 g, just 0.04 g per mm² of projected 12×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 6 mm bore sits in the miniature band; at 12 mm wide the NK6/12-TV-XL is built into compact cam drives, indexing pawls and light linkages The thin 3.0 mm section makes the 5.7 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 0.53 kN Cur value. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 36,500 r/min. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 12 mm outside diameter and 3.8 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 6 mm seat, and in planetary gear bearings the 5.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 12 mm width and the published 3.15 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK6/12-TV-XL?", "a": "The NK6/12-TV-XL is a NK machined-ring needle roller bearing without inner ring with 12 mm outside diameter, 6 mm bore and 12 mm width, envelope 6×12×12 mm. Mass is 5.7 g." }, { "q": "What does the NK6/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK6/12-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 6×12×12 mm and the catalogue ratings are C 3.8 kN, C0 3.15 kN, Cur 0.53 kN." }, { "q": "What is the load capacity of the NK6/12-TV-XL?", "a": "The basic dynamic load rating C is 3.8 kN and the basic static load rating C0 is 3.15 kN; the fatigue load limit Cur is 0.53 kN." }, { "q": "What is the maximum speed of the NK6/12-TV-XL?", "a": "The limiting speed is 36,500 r/min and the thermal reference speed is 47,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK6/12-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK6/12-TV-XL has no inner ring, so the 6 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK6-10-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK6-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 6×12×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK6-12-TV-XL", "NK6/12-TV-XL" ], "locale_variants": {} }, { "sku": "NK7-10-TV-XL", "brand": "FAG", "manufacturer_designation": "NK7/10-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 7, "D_mm": 14, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 3.25, "static_load_kN": 2.65, "fatigue_load_limit_kN": 0.42, "limiting_speed_rpm": 34500, "max_rpm": 34500, "reference_speed_rpm": 43000, "weight_g": 6.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 7×14×10 mm: 7 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 3.25 kN and C0 2.65 kN at the 7 mm seat; the C/C0 ratio of 1.23 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 14 mm outside diameter the fatigue load limit Cur is 0.42 kN, the limiting speed 34,500 r/min and the thermal reference speed 43,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.46 kN/mm and per millimetre of width 0.33 kN/mm — the reason 10 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 6.9 g, just 0.05 g per mm² of projected 14×10 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 7 mm bore this is one of the smallest HR1 executions — chosen where a 14 mm envelope must carry line-contact loads that no miniature ball bearing could take Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The thin 3.5 mm section makes the 6.9 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 0.42 kN Cur value. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 14 mm outside diameter and 3.25 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 7 mm seat, and in copying and printing machine mechanisms the 6.9 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 10 mm width and the published 2.65 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK7/10-TV-XL?", "a": "The NK7/10-TV-XL is a NK machined-ring needle roller bearing without inner ring with 14 mm outside diameter, 7 mm bore and 10 mm width, envelope 7×14×10 mm. Mass is 6.9 g." }, { "q": "What does the NK7/10-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK7/10-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 7×14×10 mm and the catalogue ratings are C 3.25 kN, C0 2.65 kN, Cur 0.42 kN." }, { "q": "What is the load capacity of the NK7/10-TV-XL?", "a": "The basic dynamic load rating C is 3.25 kN and the basic static load rating C0 is 2.65 kN; the fatigue load limit Cur is 0.42 kN." }, { "q": "What is the maximum speed of the NK7/10-TV-XL?", "a": "The limiting speed is 34,500 r/min and the thermal reference speed is 43,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK7/10-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK7/10-TV-XL has no inner ring, so the 7 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK7-10-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×14×10 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK7-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK7-10-TV-XL", "NK7/10-TV-XL" ], "locale_variants": {} }, { "sku": "NK7-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NK7/12-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 7, "D_mm": 14, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 4.15, "static_load_kN": 3.6, "fatigue_load_limit_kN": 0.61, "limiting_speed_rpm": 34500, "max_rpm": 34500, "reference_speed_rpm": 42000, "weight_g": 8.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 7×14×12 mm: 7 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 4.15 kN and C0 3.6 kN at the 7 mm seat; the C/C0 ratio of 1.15 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 14 mm outside diameter the fatigue load limit Cur is 0.61 kN, the limiting speed 34,500 r/min and the thermal reference speed 42,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.59 kN/mm and per millimetre of width 0.35 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 8.2 g, just 0.05 g per mm² of projected 14×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 7 mm bore and only 8.2 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat Omitting the inner ring frees radial space — at a 7 mm shaft the outer diameter is only 14 mm and the width 12 mm, yet C is 4.15 kN With Cur 0.61 kN and a 34,500 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins X-life status (-XL) indicates the current Schaeffler premium execution at 7 mm bore; the 3.6 kN C0 rating reflects the improved rolling-contact geometry. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 14 mm outside diameter and 4.15 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 7 mm seat, and in connecting-rod small ends the 8.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 12 mm width and the published 3.6 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK7/12-TV-XL?", "a": "The NK7/12-TV-XL is a NK machined-ring needle roller bearing without inner ring with 14 mm outside diameter, 7 mm bore and 12 mm width, envelope 7×14×12 mm. Mass is 8.2 g." }, { "q": "What does the NK7/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK7/12-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 7×14×12 mm and the catalogue ratings are C 4.15 kN, C0 3.6 kN, Cur 0.61 kN." }, { "q": "What is the load capacity of the NK7/12-TV-XL?", "a": "The basic dynamic load rating C is 4.15 kN and the basic static load rating C0 is 3.6 kN; the fatigue load limit Cur is 0.61 kN." }, { "q": "What is the maximum speed of the NK7/12-TV-XL?", "a": "The limiting speed is 34,500 r/min and the thermal reference speed is 42,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK7/12-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK7/12-TV-XL has no inner ring, so the 7 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK7-10-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK7-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×14×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK7-12-TV-XL", "NK7/12-TV-XL" ], "locale_variants": {} }, { "sku": "NK8-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NK8/12-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 8, "D_mm": 15, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 4.45, "static_load_kN": 4.1, "fatigue_load_limit_kN": 0.7, "limiting_speed_rpm": 32500, "max_rpm": 32500, "reference_speed_rpm": 37000, "weight_g": 8.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×15×12 mm: 8 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 4.45 kN and C0 4.1 kN at the 8 mm seat; the C/C0 ratio of 1.09 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 15 mm outside diameter the fatigue load limit Cur is 0.7 kN, the limiting speed 32,500 r/min and the thermal reference speed 37,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.56 kN/mm and per millimetre of width 0.37 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 8.7 g, just 0.05 g per mm² of projected 15×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 8 mm bore sits in the miniature band; at 12 mm wide the NK8/12-TV-XL is built into compact cam drives, indexing pawls and light linkages This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces Omitting the inner ring frees radial space — at a 8 mm shaft the outer diameter is only 15 mm and the width 12 mm, yet C is 4.45 kN The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 8×15×12 mm envelope. With the -TV polyamide cage the rollers are positively separated, so the 8 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 15 mm outside diameter and 4.45 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 8 mm seat, and in rocker arms and valve trains the 8.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 12 mm width and the published 4.1 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NK8/12-TV-XL?", "a": "The NK8/12-TV-XL is a NK machined-ring needle roller bearing without inner ring with 15 mm outside diameter, 8 mm bore and 12 mm width, envelope 8×15×12 mm. Mass is 8.7 g." }, { "q": "What does the NK8/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK8/12-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 8×15×12 mm and the catalogue ratings are C 4.45 kN, C0 4.1 kN, Cur 0.7 kN." }, { "q": "What is the load capacity of the NK8/12-TV-XL?", "a": "The basic dynamic load rating C is 4.45 kN and the basic static load rating C0 is 4.1 kN; the fatigue load limit Cur is 0.7 kN." }, { "q": "What is the maximum speed of the NK8/12-TV-XL?", "a": "The limiting speed is 32,500 r/min and the thermal reference speed is 37,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK8/12-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK8/12-TV-XL has no inner ring, so the 8 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK8-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×15×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK8-16-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK8-12-TV-XL", "NK8/12-TV-XL" ], "locale_variants": {} }, { "sku": "NK8-16-TV-XL", "brand": "FAG", "manufacturer_designation": "NK8/16-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 8, "D_mm": 15, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.8, "static_load_kN": 5.8, "fatigue_load_limit_kN": 0.99, "limiting_speed_rpm": 32500, "max_rpm": 32500, "reference_speed_rpm": 36500, "weight_g": 12, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×15×16 mm: 8 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 5.8 kN and C0 5.8 kN at the 8 mm seat; the C/C0 ratio of 1.00 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 15 mm outside diameter the fatigue load limit Cur is 0.99 kN, the limiting speed 32,500 r/min and the thermal reference speed 36,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.72 kN/mm and per millimetre of width 0.36 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 12 g, just 0.05 g per mm² of projected 15×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 8 mm bore and only 12 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces NK8/16-TV-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 5.8 kN C rating and longer nominal life come without an envelope change. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 32,500 r/min limiting speed without roller-to-roller sliding. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 15 mm outside diameter and 5.8 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 8 mm seat, and in small electric motor accessory drives the 12 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 16 mm width and the published 5.8 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK8/16-TV-XL?", "a": "The NK8/16-TV-XL is a NK machined-ring needle roller bearing without inner ring with 15 mm outside diameter, 8 mm bore and 16 mm width, envelope 8×15×16 mm. Mass is 12 g." }, { "q": "What does the NK8/16-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK8/16-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 8×15×16 mm and the catalogue ratings are C 5.8 kN, C0 5.8 kN, Cur 0.99 kN." }, { "q": "What is the load capacity of the NK8/16-TV-XL?", "a": "The basic dynamic load rating C is 5.8 kN and the basic static load rating C0 is 5.8 kN; the fatigue load limit Cur is 0.99 kN." }, { "q": "What is the maximum speed of the NK8/16-TV-XL?", "a": "The limiting speed is 32,500 r/min and the thermal reference speed is 36,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK8/16-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK8/16-TV-XL has no inner ring, so the 8 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK8-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK8-16-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 8×15×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK8-16-TV-XL", "NK8/16-TV-XL" ], "locale_variants": {} }, { "sku": "NK9-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NK9/12-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 9, "D_mm": 16, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.1, "static_load_kN": 5, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 31000, "max_rpm": 31000, "reference_speed_rpm": 32000, "weight_g": 10.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 9×16×12 mm: 9 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 5.1 kN and C0 5 kN at the 9 mm seat; the C/C0 ratio of 1.02 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 16 mm outside diameter the fatigue load limit Cur is 0.86 kN, the limiting speed 31,000 r/min and the thermal reference speed 32,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.57 kN/mm and per millimetre of width 0.42 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 10.3 g, just 0.05 g per mm² of projected 16×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 9 mm bore this is one of the smallest HR1 executions — chosen where a 16 mm envelope must carry line-contact loads that no miniature ball bearing could take With Cur 0.86 kN and a 31,000 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins Omitting the inner ring frees radial space — at a 9 mm shaft the outer diameter is only 16 mm and the width 12 mm, yet C is 5.1 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 5.1 kN C rating and longer nominal life come without an envelope change. With the -TV polyamide cage the rollers are positively separated, so the 9 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 16 mm outside diameter and 5.1 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 9 mm seat, and in textile machine heald and cam shafts the 10.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 12 mm width and the published 5 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK9/12-TV-XL?", "a": "The NK9/12-TV-XL is a NK machined-ring needle roller bearing without inner ring with 16 mm outside diameter, 9 mm bore and 12 mm width, envelope 9×16×12 mm. Mass is 10.3 g." }, { "q": "What does the NK9/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK9/12-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 9×16×12 mm and the catalogue ratings are C 5.1 kN, C0 5 kN, Cur 0.86 kN." }, { "q": "What is the load capacity of the NK9/12-TV-XL?", "a": "The basic dynamic load rating C is 5.1 kN and the basic static load rating C0 is 5 kN; the fatigue load limit Cur is 0.86 kN." }, { "q": "What is the maximum speed of the NK9/12-TV-XL?", "a": "The limiting speed is 31,000 r/min and the thermal reference speed is 32,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK9/12-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK9/12-TV-XL has no inner ring, so the 9 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK9-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×16×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK9-16-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK9-12-TV-XL", "NK9/12-TV-XL" ], "locale_variants": {} }, { "sku": "NK9-16-TV-XL", "brand": "FAG", "manufacturer_designation": "NK9/16-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 9, "D_mm": 16, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 6.6, "static_load_kN": 7.1, "fatigue_load_limit_kN": 1.21, "limiting_speed_rpm": 31000, "max_rpm": 31000, "reference_speed_rpm": 32000, "weight_g": 12.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 9×16×16 mm: 9 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 6.6 kN and C0 7.1 kN at the 9 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 16 mm outside diameter the fatigue load limit Cur is 1.21 kN, the limiting speed 31,000 r/min and the thermal reference speed 32,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.73 kN/mm and per millimetre of width 0.41 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 12.8 g, just 0.05 g per mm² of projected 16×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 9 mm bore sits in the miniature band; at 16 mm wide the NK9/16-TV-XL is built into compact cam drives, indexing pawls and light linkages This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The thin 3.5 mm section makes the 12.8 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 1.21 kN Cur value. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 31,000 r/min. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 16 mm outside diameter and 6.6 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 9 mm seat, and in connecting-rod small ends the 12.8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 16 mm width and the published 7.1 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK9/16-TV-XL?", "a": "The NK9/16-TV-XL is a NK machined-ring needle roller bearing without inner ring with 16 mm outside diameter, 9 mm bore and 16 mm width, envelope 9×16×16 mm. Mass is 12.8 g." }, { "q": "What does the NK9/16-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK9/16-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 9×16×16 mm and the catalogue ratings are C 6.6 kN, C0 7.1 kN, Cur 1.21 kN." }, { "q": "What is the load capacity of the NK9/16-TV-XL?", "a": "The basic dynamic load rating C is 6.6 kN and the basic static load rating C0 is 7.1 kN; the fatigue load limit Cur is 1.21 kN." }, { "q": "What is the maximum speed of the NK9/16-TV-XL?", "a": "The limiting speed is 31,000 r/min and the thermal reference speed is 32,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK9/16-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK9/16-TV-XL has no inner ring, so the 9 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK9-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK9-16-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×16×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK9-16-TV-XL", "NK9/16-TV-XL" ], "locale_variants": {} }, { "sku": "NK10-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NK10/12-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 10, "D_mm": 17, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.3, "static_load_kN": 5.5, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 29500, "max_rpm": 29500, "reference_speed_rpm": 29000, "weight_g": 10.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×17×12 mm: 10 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 5.3 kN and C0 5.5 kN at the 10 mm seat; the C/C0 ratio of 0.96 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 17 mm outside diameter the fatigue load limit Cur is 0.94 kN, the limiting speed 29,500 r/min and the thermal reference speed 29,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.53 kN/mm and per millimetre of width 0.44 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 10.1 g, just 0.05 g per mm² of projected 17×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 10 mm bore sits in the miniature band; at 12 mm wide the NK10/12-TV-XL is built into compact cam drives, indexing pawls and light linkages Omitting the inner ring frees radial space — at a 10 mm shaft the outer diameter is only 17 mm and the width 12 mm, yet C is 5.3 kN The hardness requirement is unforgiving: below about 58 HRC the 10 mm journal brinels under the 5.5 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 29,500 r/min limit. With the -TV polyamide cage the rollers are positively separated, so the 10 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 17 mm outside diameter and 5.3 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 10 mm seat, and in hydraulic and pneumatic pump eccentrics the 10.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 12 mm width and the published 5.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK10/12-TV-XL?", "a": "The NK10/12-TV-XL is a NK machined-ring needle roller bearing without inner ring with 17 mm outside diameter, 10 mm bore and 12 mm width, envelope 10×17×12 mm. Mass is 10.1 g." }, { "q": "What does the NK10/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK10/12-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 10×17×12 mm and the catalogue ratings are C 5.3 kN, C0 5.5 kN, Cur 0.94 kN." }, { "q": "What is the load capacity of the NK10/12-TV-XL?", "a": "The basic dynamic load rating C is 5.3 kN and the basic static load rating C0 is 5.5 kN; the fatigue load limit Cur is 0.94 kN." }, { "q": "What is the maximum speed of the NK10/12-TV-XL?", "a": "The limiting speed is 29,500 r/min and the thermal reference speed is 29,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK10/12-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK10/12-TV-XL has no inner ring, so the 10 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK10-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×17×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK10-16-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK10-12-TV-XL", "NK10/12-TV-XL" ], "locale_variants": {} }, { "sku": "NK10-16-TV-XL", "brand": "FAG", "manufacturer_designation": "NK10/16-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 10, "D_mm": 17, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 7, "static_load_kN": 7.8, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 29500, "max_rpm": 29500, "reference_speed_rpm": 28500, "weight_g": 13.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×17×16 mm: 10 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 7 kN and C0 7.8 kN at the 10 mm seat; the C/C0 ratio of 0.90 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 17 mm outside diameter the fatigue load limit Cur is 1.33 kN, the limiting speed 29,500 r/min and the thermal reference speed 28,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.70 kN/mm and per millimetre of width 0.44 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 13.3 g, just 0.05 g per mm² of projected 17×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 10 mm bore and only 13.3 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat With Cur 1.33 kN and a 29,500 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The thin 3.5 mm section makes the 13.3 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 10×17×16 mm envelope. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 17 mm outside diameter and 7 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 10 mm seat, and in agricultural machine pivots and linkages the 13.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 16 mm width and the published 7.8 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK10/16-TV-XL?", "a": "The NK10/16-TV-XL is a NK machined-ring needle roller bearing without inner ring with 17 mm outside diameter, 10 mm bore and 16 mm width, envelope 10×17×16 mm. Mass is 13.3 g." }, { "q": "What does the NK10/16-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK10/16-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 10×17×16 mm and the catalogue ratings are C 7 kN, C0 7.8 kN, Cur 1.33 kN." }, { "q": "What is the load capacity of the NK10/16-TV-XL?", "a": "The basic dynamic load rating C is 7 kN and the basic static load rating C0 is 7.8 kN; the fatigue load limit Cur is 1.33 kN." }, { "q": "What is the maximum speed of the NK10/16-TV-XL?", "a": "The limiting speed is 29,500 r/min and the thermal reference speed is 28,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK10/16-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK10/16-TV-XL has no inner ring, so the 10 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK10-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK10-16-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×17×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK10-16-TV-XL", "NK10/16-TV-XL" ], "locale_variants": {} }, { "sku": "NK12-12-XL", "brand": "FAG", "manufacturer_designation": "NK12/12-XL", "series": "nk-series", "type": "needle", "d_mm": 12, "D_mm": 19, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.2, "static_load_kN": 7.1, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 26500, "max_rpm": 26500, "reference_speed_rpm": 22400, "weight_g": 12.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×19×12 mm: 12 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 7.2 kN and C0 7.1 kN at the 12 mm seat; the C/C0 ratio of 1.01 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 19 mm outside diameter the fatigue load limit Cur is 1.31 kN, the limiting speed 26,500 r/min and the thermal reference speed 22,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.60 kN/mm and per millimetre of width 0.60 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 12.1 g, just 0.05 g per mm² of projected 19×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 12 mm bore sits in the miniature band; at 12 mm wide the NK12/12-XL is built into compact cam drives, indexing pawls and light linkages Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The hardness requirement is unforgiving: below about 58 HRC the 12 mm journal brinels under the 7.1 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 12×19×12 mm envelope. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 19 mm outside diameter and 7.2 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 12 mm seat, and in textile machine heald and cam shafts the 12.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 12 mm width and the published 7.1 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK12/12-XL?", "a": "The NK12/12-XL is a NK machined-ring needle roller bearing without inner ring with 19 mm outside diameter, 12 mm bore and 12 mm width, envelope 12×19×12 mm. Mass is 12.1 g." }, { "q": "What does the NK12/12-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK12/12-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×19×12 mm and the catalogue ratings are C 7.2 kN, C0 7.1 kN, Cur 1.31 kN." }, { "q": "What is the load capacity of the NK12/12-XL?", "a": "The basic dynamic load rating C is 7.2 kN and the basic static load rating C0 is 7.1 kN; the fatigue load limit Cur is 1.31 kN." }, { "q": "What is the maximum speed of the NK12/12-XL?", "a": "The limiting speed is 26,500 r/min and the thermal reference speed is 22,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK12/12-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK12/12-XL has no inner ring, so the 12 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK12-12", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×19×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK12-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK12-12-XL", "NK12/12-XL" ], "locale_variants": {} }, { "sku": "NK12-16-XL", "brand": "FAG", "manufacturer_designation": "NK12/16-XL", "series": "nk-series", "type": "needle", "d_mm": 12, "D_mm": 19, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.1, "static_load_kN": 11, "fatigue_load_limit_kN": 1.95, "limiting_speed_rpm": 26500, "max_rpm": 26500, "reference_speed_rpm": 21600, "weight_g": 15.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×19×16 mm: 12 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 10.1 kN and C0 11 kN at the 12 mm seat; the C/C0 ratio of 0.92 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 19 mm outside diameter the fatigue load limit Cur is 1.95 kN, the limiting speed 26,500 r/min and the thermal reference speed 21,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.84 kN/mm and per millimetre of width 0.63 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 15.9 g, just 0.05 g per mm² of projected 19×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 12 mm bore this is one of the smallest HR1 executions — chosen where a 19 mm envelope must carry line-contact loads that no miniature ball bearing could take NK12/16-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality Omitting the inner ring frees radial space — at a 12 mm shaft the outer diameter is only 19 mm and the width 16 mm, yet C is 10.1 kN The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 26,500 r/min limit. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 19 mm outside diameter and 10.1 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 12 mm seat, and in rocker arms and valve trains the 15.9 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 16 mm width and the published 11 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK12/16-XL?", "a": "The NK12/16-XL is a NK machined-ring needle roller bearing without inner ring with 19 mm outside diameter, 12 mm bore and 16 mm width, envelope 12×19×16 mm. Mass is 15.9 g." }, { "q": "What does the NK12/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK12/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×19×16 mm and the catalogue ratings are C 10.1 kN, C0 11 kN, Cur 1.95 kN." }, { "q": "What is the load capacity of the NK12/16-XL?", "a": "The basic dynamic load rating C is 10.1 kN and the basic static load rating C0 is 11 kN; the fatigue load limit Cur is 1.95 kN." }, { "q": "What is the maximum speed of the NK12/16-XL?", "a": "The limiting speed is 26,500 r/min and the thermal reference speed is 21,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK12/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK12/16-XL has no inner ring, so the 12 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK12-12", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK12-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×19×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK12-16-XL", "NK12/16-XL" ], "locale_variants": {} }, { "sku": "NK14-16-D-XL", "brand": "FAG", "manufacturer_designation": "NK14/16-D-XL", "series": "nk-series", "type": "needle", "d_mm": 14, "D_mm": 22, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.4, "static_load_kN": 17.1, "fatigue_load_limit_kN": 2.9, "limiting_speed_rpm": 24600, "max_rpm": 24600, "reference_speed_rpm": 16800, "weight_g": 21.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 14×22×16 mm: 14 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 15.4 kN and C0 17.1 kN at the 14 mm seat; the C/C0 ratio of 0.90 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 2.9 kN, the limiting speed 24,600 r/min and the thermal reference speed 16,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.10 kN/mm and per millimetre of width 0.96 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 21.4 g, just 0.06 g per mm² of projected 22×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 14 mm bore this size balances the 22 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The thin 4.0 mm section makes the 21.4 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting NK14/16-D-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality X-life status (-XL) indicates the current Schaeffler premium execution at 14 mm bore; the 17.1 kN C0 rating reflects the improved rolling-contact geometry. The -D suffix supplies a radially split needle roller and cage assembly, so the cage can be fitted at bearing positions that cannot be reached over a shaft end. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 22 mm outside diameter and 15.4 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 14 mm seat, and in gearbox selector and change linkages the 21.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 16 mm width and the published 17.1 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NK14/16-D-XL?", "a": "The NK14/16-D-XL is a NK machined-ring needle roller bearing without inner ring with 22 mm outside diameter, 14 mm bore and 16 mm width, envelope 14×22×16 mm. Mass is 21.4 g." }, { "q": "What does the NK14/16-D-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK14/16-D-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 14×22×16 mm and the catalogue ratings are C 15.4 kN, C0 17.1 kN, Cur 2.9 kN." }, { "q": "What is the load capacity of the NK14/16-D-XL?", "a": "The basic dynamic load rating C is 15.4 kN and the basic static load rating C0 is 17.1 kN; the fatigue load limit Cur is 2.9 kN." }, { "q": "What is the maximum speed of the NK14/16-D-XL?", "a": "The limiting speed is 24,600 r/min and the thermal reference speed is 16,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK14/16-D-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK14/16-D-XL has no inner ring, so the 14 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK14-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 14×22×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK14-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK14-16-D-XL", "NK14/16-D-XL" ], "locale_variants": {} }, { "sku": "NK14-16-XL", "brand": "FAG", "manufacturer_designation": "NK14/16-XL", "series": "nk-series", "type": "needle", "d_mm": 14, "D_mm": 22, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.4, "static_load_kN": 11.5, "fatigue_load_limit_kN": 2.14, "limiting_speed_rpm": 24600, "max_rpm": 24600, "reference_speed_rpm": 18600, "weight_g": 20.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 14×22×16 mm: 14 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 11.4 kN and C0 11.5 kN at the 14 mm seat; the C/C0 ratio of 0.99 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 2.14 kN, the limiting speed 24,600 r/min and the thermal reference speed 18,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.81 kN/mm and per millimetre of width 0.71 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 20.7 g, just 0.06 g per mm² of projected 22×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 14 mm bore the 16 mm width and 11.4 kN C rating suit high-cycle industrial machinery rather than instrument duty With Cur 2.14 kN and a 24,600 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The thin 4.0 mm section makes the 20.7 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 14×22×16 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 22 mm outside diameter and 11.4 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 14 mm seat, and in copying and printing machine mechanisms the 20.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 16 mm width and the published 11.5 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK14/16-XL?", "a": "The NK14/16-XL is a NK machined-ring needle roller bearing without inner ring with 22 mm outside diameter, 14 mm bore and 16 mm width, envelope 14×22×16 mm. Mass is 20.7 g." }, { "q": "What does the NK14/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK14/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 14×22×16 mm and the catalogue ratings are C 11.4 kN, C0 11.5 kN, Cur 2.14 kN." }, { "q": "What is the load capacity of the NK14/16-XL?", "a": "The basic dynamic load rating C is 11.4 kN and the basic static load rating C0 is 11.5 kN; the fatigue load limit Cur is 2.14 kN." }, { "q": "What is the maximum speed of the NK14/16-XL?", "a": "The limiting speed is 24,600 r/min and the thermal reference speed is 18,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK14/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK14/16-XL has no inner ring, so the 14 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK14-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 14×22×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK14-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK14-16-XL", "NK14/16-XL" ], "locale_variants": {} }, { "sku": "NK14-20-XL", "brand": "FAG", "manufacturer_designation": "NK14/20-XL", "series": "nk-series", "type": "needle", "d_mm": 14, "D_mm": 22, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.5, "static_load_kN": 15.6, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 24600, "max_rpm": 24600, "reference_speed_rpm": 18300, "weight_g": 25.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 14×22×20 mm: 14 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 14.5 kN and C0 15.6 kN at the 14 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 2.75 kN, the limiting speed 24,600 r/min and the thermal reference speed 18,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.04 kN/mm and per millimetre of width 0.72 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 25.5 g, just 0.06 g per mm² of projected 22×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 14 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces Omitting the inner ring frees radial space — at a 14 mm shaft the outer diameter is only 22 mm and the width 20 mm, yet C is 14.5 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 14.5 kN C rating and longer nominal life come without an envelope change. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 22 mm outside diameter and 14.5 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 14 mm seat, and in agricultural machine pivots and linkages the 25.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 20 mm width and the published 15.6 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NK14/20-XL?", "a": "The NK14/20-XL is a NK machined-ring needle roller bearing without inner ring with 22 mm outside diameter, 14 mm bore and 20 mm width, envelope 14×22×20 mm. Mass is 25.5 g." }, { "q": "What does the NK14/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK14/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 14×22×20 mm and the catalogue ratings are C 14.5 kN, C0 15.6 kN, Cur 2.75 kN." }, { "q": "What is the load capacity of the NK14/20-XL?", "a": "The basic dynamic load rating C is 14.5 kN and the basic static load rating C0 is 15.6 kN; the fatigue load limit Cur is 2.75 kN." }, { "q": "What is the maximum speed of the NK14/20-XL?", "a": "The limiting speed is 24,600 r/min and the thermal reference speed is 18,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK14/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK14/20-XL has no inner ring, so the 14 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK14-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK14-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 14×22×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK14-20-XL", "NK14/20-XL" ], "locale_variants": {} }, { "sku": "RNA4900-XL", "brand": "FAG", "manufacturer_designation": "RNA4900-XL", "series": "rna49-series", "type": "needle", "d_mm": 14, "D_mm": 22, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.6, "static_load_kN": 9.2, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 24600, "max_rpm": 24600, "reference_speed_rpm": 17800, "weight_g": 16.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 14×22×13 mm: 14 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 9.6 kN and C0 9.2 kN at the 14 mm seat; the C/C0 ratio of 1.04 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 1.66 kN, the limiting speed 24,600 r/min and the thermal reference speed 17,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.69 kN/mm and per millimetre of width 0.74 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 16.5 g, just 0.06 g per mm² of projected 22×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 14 mm bore this size balances the 22 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The hardness requirement is unforgiving: below about 58 HRC the 14 mm journal brinels under the 9.2 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 1.66 kN Cur value. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 22 mm outside diameter and 9.6 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 14 mm seat, and in motorcycle and light-vehicle transmissions the 16.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 13 mm width and the published 9.2 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA4900-XL?", "a": "The RNA4900-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 22 mm outside diameter, 14 mm bore and 13 mm width, envelope 14×22×13 mm. Mass is 16.5 g." }, { "q": "What does the RNA4900-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4900-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 14×22×13 mm and the catalogue ratings are C 9.6 kN, C0 9.2 kN, Cur 1.66 kN." }, { "q": "What is the load capacity of the RNA4900-XL?", "a": "The basic dynamic load rating C is 9.6 kN and the basic static load rating C0 is 9.2 kN; the fatigue load limit Cur is 1.66 kN." }, { "q": "What is the maximum speed of the RNA4900-XL?", "a": "The limiting speed is 24,600 r/min and the thermal reference speed is 17,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4900-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4900-XL has no inner ring, so the 14 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4900", "equiv_brand": "SKF", "level": "partial", "note": "Same 14×22×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 14×22×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4900-XL", "RNA4900-XL" ], "locale_variants": {} }, { "sku": "NK15-16-XL", "brand": "FAG", "manufacturer_designation": "NK15/16-XL", "series": "nk-series", "type": "needle", "d_mm": 15, "D_mm": 23, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.1, "static_load_kN": 12.7, "fatigue_load_limit_kN": 2.36, "limiting_speed_rpm": 23900, "max_rpm": 23900, "reference_speed_rpm": 17300, "weight_g": 21.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×23×16 mm: 15 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 12.1 kN and C0 12.7 kN at the 15 mm seat; the C/C0 ratio of 0.95 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 23 mm outside diameter the fatigue load limit Cur is 2.36 kN, the limiting speed 23,900 r/min and the thermal reference speed 17,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.81 kN/mm and per millimetre of width 0.76 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 21.8 g, just 0.06 g per mm² of projected 23×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 15 mm bore this size balances the 23 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The hardness requirement is unforgiving: below about 58 HRC the 15 mm journal brinels under the 12.7 kN static rating, and roughness above raceway finish accelerates roller wear NK15/16-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 15×23×16 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 23 mm outside diameter and 12.1 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 15 mm seat, and in planetary gear bearings the 21.8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 16 mm width and the published 12.7 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NK15/16-XL?", "a": "The NK15/16-XL is a NK machined-ring needle roller bearing without inner ring with 23 mm outside diameter, 15 mm bore and 16 mm width, envelope 15×23×16 mm. Mass is 21.8 g." }, { "q": "What does the NK15/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK15/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×23×16 mm and the catalogue ratings are C 12.1 kN, C0 12.7 kN, Cur 2.36 kN." }, { "q": "What is the load capacity of the NK15/16-XL?", "a": "The basic dynamic load rating C is 12.1 kN and the basic static load rating C0 is 12.7 kN; the fatigue load limit Cur is 2.36 kN." }, { "q": "What is the maximum speed of the NK15/16-XL?", "a": "The limiting speed is 23,900 r/min and the thermal reference speed is 17,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK15/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK15/16-XL has no inner ring, so the 15 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK15-16", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NK15-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK15-16-XL", "NK15/16-XL" ], "locale_variants": {} }, { "sku": "NK15-20-XL", "brand": "FAG", "manufacturer_designation": "NK15/20-XL", "series": "nk-series", "type": "needle", "d_mm": 15, "D_mm": 23, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.4, "static_load_kN": 17.2, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 23900, "max_rpm": 23900, "reference_speed_rpm": 17000, "weight_g": 26.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×23×20 mm: 15 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 15.4 kN and C0 17.2 kN at the 15 mm seat; the C/C0 ratio of 0.90 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 23 mm outside diameter the fatigue load limit Cur is 3.05 kN, the limiting speed 23,900 r/min and the thermal reference speed 17,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 0.77 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 26.6 g, just 0.06 g per mm² of projected 23×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 15 mm bore the 20 mm width and 15.4 kN C rating suit high-cycle industrial machinery rather than instrument duty The hardness requirement is unforgiving: below about 58 HRC the 15 mm journal brinels under the 17.2 kN static rating, and roughness above raceway finish accelerates roller wear -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 15.4 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 23 mm outside diameter and 15.4 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 15 mm seat, and in copying and printing machine mechanisms the 26.6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 17.2 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK15/20-XL?", "a": "The NK15/20-XL is a NK machined-ring needle roller bearing without inner ring with 23 mm outside diameter, 15 mm bore and 20 mm width, envelope 15×23×20 mm. Mass is 26.6 g." }, { "q": "What does the NK15/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK15/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×23×20 mm and the catalogue ratings are C 15.4 kN, C0 17.2 kN, Cur 3.05 kN." }, { "q": "What is the load capacity of the NK15/20-XL?", "a": "The basic dynamic load rating C is 15.4 kN and the basic static load rating C0 is 17.2 kN; the fatigue load limit Cur is 3.05 kN." }, { "q": "What is the maximum speed of the NK15/20-XL?", "a": "The limiting speed is 23,900 r/min and the thermal reference speed is 17,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK15/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK15/20-XL has no inner ring, so the 15 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK15-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK15-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×23×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK15-20-XL", "NK15/20-XL" ], "locale_variants": {} }, { "sku": "NK16-16-XL", "brand": "FAG", "manufacturer_designation": "NK16/16-XL", "series": "nk-series", "type": "needle", "d_mm": 16, "D_mm": 24, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.8, "static_load_kN": 13.9, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 16200, "weight_g": 22.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×24×16 mm: 16 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 12.8 kN and C0 13.9 kN at the 16 mm seat; the C/C0 ratio of 0.92 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 2.6 kN, the limiting speed 23,200 r/min and the thermal reference speed 16,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.80 kN/mm and per millimetre of width 0.80 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 22.4 g, just 0.06 g per mm² of projected 24×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 16 mm bore this size balances the 24 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 16×24×16 mm envelope. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 24 mm outside diameter and 12.8 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 16 mm seat, and in small electric motor accessory drives the 22.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 16 mm width and the published 13.9 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK16/16-XL?", "a": "The NK16/16-XL is a NK machined-ring needle roller bearing without inner ring with 24 mm outside diameter, 16 mm bore and 16 mm width, envelope 16×24×16 mm. Mass is 22.4 g." }, { "q": "What does the NK16/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK16/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×24×16 mm and the catalogue ratings are C 12.8 kN, C0 13.9 kN, Cur 2.6 kN." }, { "q": "What is the load capacity of the NK16/16-XL?", "a": "The basic dynamic load rating C is 12.8 kN and the basic static load rating C0 is 13.9 kN; the fatigue load limit Cur is 2.6 kN." }, { "q": "What is the maximum speed of the NK16/16-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 16,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK16/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK16/16-XL has no inner ring, so the 16 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK16-16", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NK16-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK16-16-XL", "NK16/16-XL" ], "locale_variants": {} }, { "sku": "NK16-20-XL", "brand": "FAG", "manufacturer_designation": "NK16/20-XL", "series": "nk-series", "type": "needle", "d_mm": 16, "D_mm": 24, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.3, "static_load_kN": 18.8, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 15900, "weight_g": 28.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×24×20 mm: 16 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 16.3 kN and C0 18.8 kN at the 16 mm seat; the C/C0 ratio of 0.87 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 3.35 kN, the limiting speed 23,200 r/min and the thermal reference speed 15,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.02 kN/mm and per millimetre of width 0.82 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 28.4 g, just 0.06 g per mm² of projected 24×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 16 mm bore the 20 mm width and 16.3 kN C rating suit high-cycle industrial machinery rather than instrument duty The hardness requirement is unforgiving: below about 58 HRC the 16 mm journal brinels under the 18.8 kN static rating, and roughness above raceway finish accelerates roller wear The thin 4.0 mm section makes the 28.4 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 16.3 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 24 mm outside diameter and 16.3 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 16 mm seat, and in gearbox selector and change linkages the 28.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 20 mm width and the published 18.8 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK16/20-XL?", "a": "The NK16/20-XL is a NK machined-ring needle roller bearing without inner ring with 24 mm outside diameter, 16 mm bore and 20 mm width, envelope 16×24×20 mm. Mass is 28.4 g." }, { "q": "What does the NK16/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK16/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×24×20 mm and the catalogue ratings are C 16.3 kN, C0 18.8 kN, Cur 3.35 kN." }, { "q": "What is the load capacity of the NK16/20-XL?", "a": "The basic dynamic load rating C is 16.3 kN and the basic static load rating C0 is 18.8 kN; the fatigue load limit Cur is 3.35 kN." }, { "q": "What is the maximum speed of the NK16/20-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 15,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK16/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK16/20-XL has no inner ring, so the 16 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK16-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK16-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 16×24×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK16-20-XL", "NK16/20-XL" ], "locale_variants": {} }, { "sku": "RNA4901-XL", "brand": "FAG", "manufacturer_designation": "RNA4901-XL", "series": "rna49-series", "type": "needle", "d_mm": 16, "D_mm": 24, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.6, "static_load_kN": 10.9, "fatigue_load_limit_kN": 1.97, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 15300, "weight_g": 17.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×24×13 mm: 16 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 10.6 kN and C0 10.9 kN at the 16 mm seat; the C/C0 ratio of 0.97 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 1.97 kN, the limiting speed 23,200 r/min and the thermal reference speed 15,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.66 kN/mm and per millimetre of width 0.82 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 17.4 g, just 0.06 g per mm² of projected 24×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 16 mm bore this size balances the 24 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 1.97 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 24 mm outside diameter and 10.6 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 16 mm seat, and in small electric motor accessory drives the 17.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 13 mm width and the published 10.9 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4901-XL?", "a": "The RNA4901-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 24 mm outside diameter, 16 mm bore and 13 mm width, envelope 16×24×13 mm. Mass is 17.4 g." }, { "q": "What does the RNA4901-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4901-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×24×13 mm and the catalogue ratings are C 10.6 kN, C0 10.9 kN, Cur 1.97 kN." }, { "q": "What is the load capacity of the RNA4901-XL?", "a": "The basic dynamic load rating C is 10.6 kN and the basic static load rating C0 is 10.9 kN; the fatigue load limit Cur is 1.97 kN." }, { "q": "What is the maximum speed of the RNA4901-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 15,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4901-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4901-XL has no inner ring, so the 16 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4901", "equiv_brand": "SKF", "level": "partial", "note": "Same 16×24×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 16×24×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4901-XL", "RNA4901-XL" ], "locale_variants": {} }, { "sku": "RNA6901-XL", "brand": "FAG", "manufacturer_designation": "RNA6901-XL", "series": "rna69-series", "type": "needle", "d_mm": 16, "D_mm": 24, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 18.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 14300, "weight_g": 31, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×24×22 mm: 16 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 18.1 kN and C0 21.6 kN at the 16 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 3.85 kN, the limiting speed 23,200 r/min and the thermal reference speed 14,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 0.82 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 31 g, just 0.06 g per mm² of projected 24×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 16 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty With Cur 3.85 kN and a 23,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The thin 4.0 mm section makes the 31 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.85 kN Cur value. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 24 mm outside diameter and 18.1 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 16 mm seat, and in motorcycle and light-vehicle transmissions the 31 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 22 mm width and the published 21.6 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNA6901-XL?", "a": "The RNA6901-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 24 mm outside diameter, 16 mm bore and 22 mm width, envelope 16×24×22 mm. Mass is 31 g." }, { "q": "What does the RNA6901-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6901-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×24×22 mm and the catalogue ratings are C 18.1 kN, C0 21.6 kN, Cur 3.85 kN." }, { "q": "What is the load capacity of the RNA6901-XL?", "a": "The basic dynamic load rating C is 18.1 kN and the basic static load rating C0 is 21.6 kN; the fatigue load limit Cur is 3.85 kN." }, { "q": "What is the maximum speed of the RNA6901-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 14,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6901-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6901-XL has no inner ring, so the 16 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6901", "equiv_brand": "SKF", "level": "partial", "note": "Same 16×24×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6901-XL", "RNA6901-XL" ], "locale_variants": {} }, { "sku": "NK17-16-XL", "brand": "FAG", "manufacturer_designation": "NK17/16-XL", "series": "nk-series", "type": "needle", "d_mm": 17, "D_mm": 25, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13.5, "static_load_kN": 15, "fatigue_load_limit_kN": 2.8, "limiting_speed_rpm": 22600, "max_rpm": 22600, "reference_speed_rpm": 15300, "weight_g": 23.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×25×16 mm: 17 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 13.5 kN and C0 15 kN at the 17 mm seat; the C/C0 ratio of 0.90 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 25 mm outside diameter the fatigue load limit Cur is 2.8 kN, the limiting speed 22,600 r/min and the thermal reference speed 15,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.79 kN/mm and per millimetre of width 0.84 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 23.7 g, just 0.06 g per mm² of projected 25×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 17 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces NK17/16-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 17×25×16 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 25 mm outside diameter and 13.5 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 17 mm seat, and in two-stroke and compressor piston pins the 23.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 16 mm width and the published 15 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK17/16-XL?", "a": "The NK17/16-XL is a NK machined-ring needle roller bearing without inner ring with 25 mm outside diameter, 17 mm bore and 16 mm width, envelope 17×25×16 mm. Mass is 23.7 g." }, { "q": "What does the NK17/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK17/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×25×16 mm and the catalogue ratings are C 13.5 kN, C0 15 kN, Cur 2.8 kN." }, { "q": "What is the load capacity of the NK17/16-XL?", "a": "The basic dynamic load rating C is 13.5 kN and the basic static load rating C0 is 15 kN; the fatigue load limit Cur is 2.8 kN." }, { "q": "What is the maximum speed of the NK17/16-XL?", "a": "The limiting speed is 22,600 r/min and the thermal reference speed is 15,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK17/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK17/16-XL has no inner ring, so the 17 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK17-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×25×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK17-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK17-16-XL", "NK17/16-XL" ], "locale_variants": {} }, { "sku": "NK17-20-XL", "brand": "FAG", "manufacturer_designation": "NK17/20-XL", "series": "nk-series", "type": "needle", "d_mm": 17, "D_mm": 25, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 17.1, "static_load_kN": 20.4, "fatigue_load_limit_kN": 3.6, "limiting_speed_rpm": 22600, "max_rpm": 22600, "reference_speed_rpm": 15000, "weight_g": 29.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×25×20 mm: 17 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 17.1 kN and C0 20.4 kN at the 17 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 25 mm outside diameter the fatigue load limit Cur is 3.6 kN, the limiting speed 22,600 r/min and the thermal reference speed 15,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 0.86 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 29.8 g, just 0.06 g per mm² of projected 25×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 17 mm bore this size balances the 25 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The hardness requirement is unforgiving: below about 58 HRC the 17 mm journal brinels under the 20.4 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.6 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 25 mm outside diameter and 17.1 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 17 mm seat, and in connecting-rod small ends the 29.8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 20 mm width and the published 20.4 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK17/20-XL?", "a": "The NK17/20-XL is a NK machined-ring needle roller bearing without inner ring with 25 mm outside diameter, 17 mm bore and 20 mm width, envelope 17×25×20 mm. Mass is 29.8 g." }, { "q": "What does the NK17/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK17/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×25×20 mm and the catalogue ratings are C 17.1 kN, C0 20.4 kN, Cur 3.6 kN." }, { "q": "What is the load capacity of the NK17/20-XL?", "a": "The basic dynamic load rating C is 17.1 kN and the basic static load rating C0 is 20.4 kN; the fatigue load limit Cur is 3.6 kN." }, { "q": "What is the maximum speed of the NK17/20-XL?", "a": "The limiting speed is 22,600 r/min and the thermal reference speed is 15,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK17/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK17/20-XL has no inner ring, so the 17 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK17-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK17-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×25×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK17-20-XL", "NK17/20-XL" ], "locale_variants": {} }, { "sku": "NK18-16-XL", "brand": "FAG", "manufacturer_designation": "NK18/16-XL", "series": "nk-series", "type": "needle", "d_mm": 18, "D_mm": 26, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.1, "static_load_kN": 16.2, "fatigue_load_limit_kN": 3.05, "limiting_speed_rpm": 22100, "max_rpm": 22100, "reference_speed_rpm": 14400, "weight_g": 24.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 18×26×16 mm: 18 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 14.1 kN and C0 16.2 kN at the 18 mm seat; the C/C0 ratio of 0.87 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 26 mm outside diameter the fatigue load limit Cur is 3.05 kN, the limiting speed 22,100 r/min and the thermal reference speed 14,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.78 kN/mm and per millimetre of width 0.88 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 24.9 g, just 0.06 g per mm² of projected 26×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 18 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty With Cur 3.05 kN and a 22,100 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 14.1 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 26 mm outside diameter and 14.1 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 18 mm seat, and in hydraulic and pneumatic pump eccentrics the 24.9 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 16 mm width and the published 16.2 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK18/16-XL?", "a": "The NK18/16-XL is a NK machined-ring needle roller bearing without inner ring with 26 mm outside diameter, 18 mm bore and 16 mm width, envelope 18×26×16 mm. Mass is 24.9 g." }, { "q": "What does the NK18/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK18/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 18×26×16 mm and the catalogue ratings are C 14.1 kN, C0 16.2 kN, Cur 3.05 kN." }, { "q": "What is the load capacity of the NK18/16-XL?", "a": "The basic dynamic load rating C is 14.1 kN and the basic static load rating C0 is 16.2 kN; the fatigue load limit Cur is 3.05 kN." }, { "q": "What is the maximum speed of the NK18/16-XL?", "a": "The limiting speed is 22,100 r/min and the thermal reference speed is 14,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK18/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK18/16-XL has no inner ring, so the 18 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK18-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 18×26×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK18-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK18-16-XL", "NK18/16-XL" ], "locale_variants": {} }, { "sku": "NK18-20-XL", "brand": "FAG", "manufacturer_designation": "NK18/20-XL", "series": "nk-series", "type": "needle", "d_mm": 18, "D_mm": 26, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 17.9, "static_load_kN": 22, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 22100, "max_rpm": 22100, "reference_speed_rpm": 14100, "weight_g": 31.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 18×26×20 mm: 18 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 17.9 kN and C0 22 kN at the 18 mm seat; the C/C0 ratio of 0.81 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 26 mm outside diameter the fatigue load limit Cur is 3.9 kN, the limiting speed 22,100 r/min and the thermal reference speed 14,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.99 kN/mm and per millimetre of width 0.89 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 31.4 g, just 0.06 g per mm² of projected 26×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 18 mm bore this size balances the 26 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range NK18/20-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The hardness requirement is unforgiving: below about 58 HRC the 18 mm journal brinels under the 22 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.9 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 26 mm outside diameter and 17.9 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 18 mm seat, and in textile machine heald and cam shafts the 31.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 22 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK18/20-XL?", "a": "The NK18/20-XL is a NK machined-ring needle roller bearing without inner ring with 26 mm outside diameter, 18 mm bore and 20 mm width, envelope 18×26×20 mm. Mass is 31.4 g." }, { "q": "What does the NK18/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK18/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 18×26×20 mm and the catalogue ratings are C 17.9 kN, C0 22 kN, Cur 3.9 kN." }, { "q": "What is the load capacity of the NK18/20-XL?", "a": "The basic dynamic load rating C is 17.9 kN and the basic static load rating C0 is 22 kN; the fatigue load limit Cur is 3.9 kN." }, { "q": "What is the maximum speed of the NK18/20-XL?", "a": "The limiting speed is 22,100 r/min and the thermal reference speed is 14,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK18/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK18/20-XL has no inner ring, so the 18 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK18-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK18-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 18×26×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK18-20-XL", "NK18/20-XL" ], "locale_variants": {} }, { "sku": "NK19-16-XL", "brand": "FAG", "manufacturer_designation": "NK19/16-XL", "series": "nk-series", "type": "needle", "d_mm": 19, "D_mm": 27, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.7, "static_load_kN": 17.4, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 21600, "max_rpm": 21600, "reference_speed_rpm": 13700, "weight_g": 26.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 19×27×16 mm: 19 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 14.7 kN and C0 17.4 kN at the 19 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 27 mm outside diameter the fatigue load limit Cur is 3.25 kN, the limiting speed 21,600 r/min and the thermal reference speed 13,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.77 kN/mm and per millimetre of width 0.92 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 26.1 g, just 0.06 g per mm² of projected 27×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 19 mm bore the 16 mm width and 14.7 kN C rating suit high-cycle industrial machinery rather than instrument duty Omitting the inner ring frees radial space — at a 19 mm shaft the outer diameter is only 27 mm and the width 16 mm, yet C is 14.7 kN This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 14.7 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 27 mm outside diameter and 14.7 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 19 mm seat, and in gearbox selector and change linkages the 26.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 16 mm width and the published 17.4 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK19/16-XL?", "a": "The NK19/16-XL is a NK machined-ring needle roller bearing without inner ring with 27 mm outside diameter, 19 mm bore and 16 mm width, envelope 19×27×16 mm. Mass is 26.1 g." }, { "q": "What does the NK19/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK19/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 19×27×16 mm and the catalogue ratings are C 14.7 kN, C0 17.4 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the NK19/16-XL?", "a": "The basic dynamic load rating C is 14.7 kN and the basic static load rating C0 is 17.4 kN; the fatigue load limit Cur is 3.25 kN." }, { "q": "What is the maximum speed of the NK19/16-XL?", "a": "The limiting speed is 21,600 r/min and the thermal reference speed is 13,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK19/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK19/16-XL has no inner ring, so the 19 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK19-16", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NK19-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK19-16-XL", "NK19/16-XL" ], "locale_variants": {} }, { "sku": "NK19-20-XL", "brand": "FAG", "manufacturer_designation": "NK19/20-XL", "series": "nk-series", "type": "needle", "d_mm": 19, "D_mm": 27, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 18.7, "static_load_kN": 23.6, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 21600, "max_rpm": 21600, "reference_speed_rpm": 13400, "weight_g": 32.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 19×27×20 mm: 19 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 18.7 kN and C0 23.6 kN at the 19 mm seat; the C/C0 ratio of 0.79 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 27 mm outside diameter the fatigue load limit Cur is 4.2 kN, the limiting speed 21,600 r/min and the thermal reference speed 13,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.98 kN/mm and per millimetre of width 0.93 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 32.2 g, just 0.06 g per mm² of projected 27×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 19 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened Omitting the inner ring frees radial space — at a 19 mm shaft the outer diameter is only 27 mm and the width 20 mm, yet C is 18.7 kN As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 4.2 kN Cur value. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 27 mm outside diameter and 18.7 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 19 mm seat, and in hydraulic and pneumatic pump eccentrics the 32.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 23.6 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK19/20-XL?", "a": "The NK19/20-XL is a NK machined-ring needle roller bearing without inner ring with 27 mm outside diameter, 19 mm bore and 20 mm width, envelope 19×27×20 mm. Mass is 32.2 g." }, { "q": "What does the NK19/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK19/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 19×27×20 mm and the catalogue ratings are C 18.7 kN, C0 23.6 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the NK19/20-XL?", "a": "The basic dynamic load rating C is 18.7 kN and the basic static load rating C0 is 23.6 kN; the fatigue load limit Cur is 4.2 kN." }, { "q": "What is the maximum speed of the NK19/20-XL?", "a": "The limiting speed is 21,600 r/min and the thermal reference speed is 13,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK19/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK19/20-XL has no inner ring, so the 19 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK19-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK19-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 19×27×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=947", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK19-20-XL", "NK19/20-XL" ], "locale_variants": {} }, { "sku": "NK20-16-D-XL", "brand": "FAG", "manufacturer_designation": "NK20/16-D-XL", "series": "nk-series", "type": "needle", "d_mm": 20, "D_mm": 28, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 18.5, "static_load_kN": 23.9, "fatigue_load_limit_kN": 4.1, "limiting_speed_rpm": 21100, "max_rpm": 21100, "reference_speed_rpm": 12100, "weight_g": 28.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×28×16 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 18.5 kN and C0 23.9 kN at the 20 mm seat; the C/C0 ratio of 0.77 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 4.1 kN, the limiting speed 21,100 r/min and the thermal reference speed 12,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 1.16 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 28.4 g, just 0.06 g per mm² of projected 28×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Omitting the inner ring frees radial space — at a 20 mm shaft the outer diameter is only 28 mm and the width 16 mm, yet C is 18.5 kN With Cur 4.1 kN and a 21,100 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 21,100 r/min limit. The split -D cage targets positions where the shaft cannot be threaded through an intact bearing; seating and axial retention must follow the mounting instructions. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 28 mm outside diameter and 18.5 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 20 mm seat, and in agricultural machine pivots and linkages the 28.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 16 mm width and the published 23.9 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK20/16-D-XL?", "a": "The NK20/16-D-XL is a NK machined-ring needle roller bearing without inner ring with 28 mm outside diameter, 20 mm bore and 16 mm width, envelope 20×28×16 mm. Mass is 28.4 g." }, { "q": "What does the NK20/16-D-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK20/16-D-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×28×16 mm and the catalogue ratings are C 18.5 kN, C0 23.9 kN, Cur 4.1 kN." }, { "q": "What is the load capacity of the NK20/16-D-XL?", "a": "The basic dynamic load rating C is 18.5 kN and the basic static load rating C0 is 23.9 kN; the fatigue load limit Cur is 4.1 kN." }, { "q": "What is the maximum speed of the NK20/16-D-XL?", "a": "The limiting speed is 21,100 r/min and the thermal reference speed is 12,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK20/16-D-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK20/16-D-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK20-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×28×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK20-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK20-16-D-XL", "NK20/16-D-XL" ], "locale_variants": {} }, { "sku": "NK20-16-XL", "brand": "FAG", "manufacturer_designation": "NK20/16-XL", "series": "nk-series", "type": "needle", "d_mm": 20, "D_mm": 28, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.6, "static_load_kN": 17.5, "fatigue_load_limit_kN": 3.3, "limiting_speed_rpm": 21100, "max_rpm": 21100, "reference_speed_rpm": 13200, "weight_g": 27, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×28×16 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 14.6 kN and C0 17.5 kN at the 20 mm seat; the C/C0 ratio of 0.83 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 3.3 kN, the limiting speed 21,100 r/min and the thermal reference speed 13,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.73 kN/mm and per millimetre of width 0.91 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 27 g, just 0.06 g per mm² of projected 28×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The thin 4.0 mm section makes the 27 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The hardness requirement is unforgiving: below about 58 HRC the 20 mm journal brinels under the 17.5 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.3 kN Cur value. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 28 mm outside diameter and 14.6 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 20 mm seat, and in motorcycle and light-vehicle transmissions the 27 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 16 mm width and the published 17.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK20/16-XL?", "a": "The NK20/16-XL is a NK machined-ring needle roller bearing without inner ring with 28 mm outside diameter, 20 mm bore and 16 mm width, envelope 20×28×16 mm. Mass is 27 g." }, { "q": "What does the NK20/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK20/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×28×16 mm and the catalogue ratings are C 14.6 kN, C0 17.5 kN, Cur 3.3 kN." }, { "q": "What is the load capacity of the NK20/16-XL?", "a": "The basic dynamic load rating C is 14.6 kN and the basic static load rating C0 is 17.5 kN; the fatigue load limit Cur is 3.3 kN." }, { "q": "What is the maximum speed of the NK20/16-XL?", "a": "The limiting speed is 21,100 r/min and the thermal reference speed is 13,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK20/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK20/16-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK20-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×28×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK20-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK20-16-XL", "NK20/16-XL" ], "locale_variants": {} }, { "sku": "NK20-20-XL", "brand": "FAG", "manufacturer_designation": "NK20/20-XL", "series": "nk-series", "type": "needle", "d_mm": 20, "D_mm": 28, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 18.6, "static_load_kN": 23.8, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 21100, "max_rpm": 21100, "reference_speed_rpm": 12900, "weight_g": 33.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×28×20 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 18.6 kN and C0 23.8 kN at the 20 mm seat; the C/C0 ratio of 0.78 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 4.2 kN, the limiting speed 21,100 r/min and the thermal reference speed 12,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 0.93 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 33.9 g, just 0.06 g per mm² of projected 28×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 20 mm bore this size balances the 28 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The hardness requirement is unforgiving: below about 58 HRC the 20 mm journal brinels under the 23.8 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 21,100 r/min limit. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 28 mm outside diameter and 18.6 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 20 mm seat, and in textile machine heald and cam shafts the 33.9 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 23.8 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK20/20-XL?", "a": "The NK20/20-XL is a NK machined-ring needle roller bearing without inner ring with 28 mm outside diameter, 20 mm bore and 20 mm width, envelope 20×28×20 mm. Mass is 33.9 g." }, { "q": "What does the NK20/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK20/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×28×20 mm and the catalogue ratings are C 18.6 kN, C0 23.8 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the NK20/20-XL?", "a": "The basic dynamic load rating C is 18.6 kN and the basic static load rating C0 is 23.8 kN; the fatigue load limit Cur is 4.2 kN." }, { "q": "What is the maximum speed of the NK20/20-XL?", "a": "The limiting speed is 21,100 r/min and the thermal reference speed is 12,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK20/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK20/20-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK20-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK20-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×28×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK20-20-XL", "NK20/20-XL" ], "locale_variants": {} }, { "sku": "RNA4902-XL", "brand": "FAG", "manufacturer_designation": "RNA4902-XL", "series": "rna49-series", "type": "needle", "d_mm": 20, "D_mm": 28, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12, "static_load_kN": 13.6, "fatigue_load_limit_kN": 2.47, "limiting_speed_rpm": 21100, "max_rpm": 21100, "reference_speed_rpm": 12000, "weight_g": 21.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×28×13 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 12 kN and C0 13.6 kN at the 20 mm seat; the C/C0 ratio of 0.88 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.47 kN, the limiting speed 21,100 r/min and the thermal reference speed 12,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.60 kN/mm and per millimetre of width 0.92 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 21.7 g, just 0.06 g per mm² of projected 28×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 20 mm bore this size balances the 28 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range RNA4902-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 2.47 kN Cur value. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 28 mm outside diameter and 12 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 20 mm seat, and in copying and printing machine mechanisms the 21.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 13 mm width and the published 13.6 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4902-XL?", "a": "The RNA4902-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 28 mm outside diameter, 20 mm bore and 13 mm width, envelope 20×28×13 mm. Mass is 21.7 g." }, { "q": "What does the RNA4902-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4902-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×28×13 mm and the catalogue ratings are C 12 kN, C0 13.6 kN, Cur 2.47 kN." }, { "q": "What is the load capacity of the RNA4902-XL?", "a": "The basic dynamic load rating C is 12 kN and the basic static load rating C0 is 13.6 kN; the fatigue load limit Cur is 2.47 kN." }, { "q": "What is the maximum speed of the RNA4902-XL?", "a": "The limiting speed is 21,100 r/min and the thermal reference speed is 12,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4902-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4902-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4902", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×28×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×28×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4902-XL", "RNA4902-XL" ], "locale_variants": {} }, { "sku": "RNA6902-XL", "brand": "FAG", "manufacturer_designation": "RNA6902-XL", "series": "rna69-series", "type": "needle", "d_mm": 20, "D_mm": 28, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 19.5, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 21100, "max_rpm": 21100, "reference_speed_rpm": 11700, "weight_g": 39.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×28×23 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 19.5 kN and C0 25.5 kN at the 20 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 4.55 kN, the limiting speed 21,100 r/min and the thermal reference speed 11,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.97 kN/mm and per millimetre of width 0.85 kN/mm — the reason 23 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 39.7 g, just 0.06 g per mm² of projected 28×23 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Omitting the inner ring frees radial space — at a 20 mm shaft the outer diameter is only 28 mm and the width 23 mm, yet C is 19.5 kN This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 4.55 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 28 mm outside diameter and 19.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 20 mm seat, and in small electric motor accessory drives the 39.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 23 mm width and the published 25.5 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA6902-XL?", "a": "The RNA6902-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 28 mm outside diameter, 20 mm bore and 23 mm width, envelope 20×28×23 mm. Mass is 39.7 g." }, { "q": "What does the RNA6902-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6902-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×28×23 mm and the catalogue ratings are C 19.5 kN, C0 25.5 kN, Cur 4.55 kN." }, { "q": "What is the load capacity of the RNA6902-XL?", "a": "The basic dynamic load rating C is 19.5 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.55 kN." }, { "q": "What is the maximum speed of the RNA6902-XL?", "a": "The limiting speed is 21,100 r/min and the thermal reference speed is 11,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6902-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6902-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6902", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×28×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6902-XL", "RNA6902-XL" ], "locale_variants": {} }, { "sku": "NKS20-XL", "brand": "FAG", "manufacturer_designation": "NKS20-XL", "series": "nks-series", "type": "needle", "d_mm": 20, "D_mm": 32, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 25, "fatigue_load_limit_kN": 4.5, "limiting_speed_rpm": 20000, "max_rpm": 20000, "reference_speed_rpm": 11800, "weight_g": 48.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×32×20 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 26 kN and C0 25 kN at the 20 mm seat; the C/C0 ratio of 1.04 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 4.5 kN, the limiting speed 20,000 r/min and the thermal reference speed 11,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.30 kN/mm and per millimetre of width 1.30 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 48.7 g, just 0.08 g per mm² of projected 32×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 20 mm width and 26 kN C rating suit high-cycle industrial machinery rather than instrument duty This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The thin 6.0 mm section makes the 48.7 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 20,000 r/min limit. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 32 mm outside diameter and 26 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 20 mm seat, and in two-stroke and compressor piston pins the 48.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 20 mm width and the published 25 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKS20-XL?", "a": "The NKS20-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 32 mm outside diameter, 20 mm bore and 20 mm width, envelope 20×32×20 mm. Mass is 48.7 g." }, { "q": "What does the NKS20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS20-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×32×20 mm and the catalogue ratings are C 26 kN, C0 25 kN, Cur 4.5 kN." }, { "q": "What is the load capacity of the NKS20-XL?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 25 kN; the fatigue load limit Cur is 4.5 kN." }, { "q": "What is the maximum speed of the NKS20-XL?", "a": "The limiting speed is 20,000 r/min and the thermal reference speed is 11,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS20-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS20", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS20-XL", "NKS20-XL" ], "locale_variants": {} }, { "sku": "NK21-16-XL", "brand": "FAG", "manufacturer_designation": "NK21/16-XL", "series": "nk-series", "type": "needle", "d_mm": 21, "D_mm": 29, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.2, "static_load_kN": 18.7, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 20600, "max_rpm": 20600, "reference_speed_rpm": 12600, "weight_g": 28.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 21×29×16 mm: 21 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 15.2 kN and C0 18.7 kN at the 21 mm seat; the C/C0 ratio of 0.81 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 29 mm outside diameter the fatigue load limit Cur is 3.5 kN, the limiting speed 20,600 r/min and the thermal reference speed 12,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.72 kN/mm and per millimetre of width 0.95 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 28.1 g, just 0.06 g per mm² of projected 29×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 21 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 3.5 kN and a 20,600 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins X-life status (-XL) indicates the current Schaeffler premium execution at 21 mm bore; the 18.7 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 29 mm outside diameter and 15.2 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 21 mm seat, and in copying and printing machine mechanisms the 28.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 16 mm width and the published 18.7 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK21/16-XL?", "a": "The NK21/16-XL is a NK machined-ring needle roller bearing without inner ring with 29 mm outside diameter, 21 mm bore and 16 mm width, envelope 21×29×16 mm. Mass is 28.1 g." }, { "q": "What does the NK21/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK21/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 21×29×16 mm and the catalogue ratings are C 15.2 kN, C0 18.7 kN, Cur 3.5 kN." }, { "q": "What is the load capacity of the NK21/16-XL?", "a": "The basic dynamic load rating C is 15.2 kN and the basic static load rating C0 is 18.7 kN; the fatigue load limit Cur is 3.5 kN." }, { "q": "What is the maximum speed of the NK21/16-XL?", "a": "The limiting speed is 20,600 r/min and the thermal reference speed is 12,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK21/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK21/16-XL has no inner ring, so the 21 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK21-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 21×29×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK21-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK21-16-XL", "NK21/16-XL" ], "locale_variants": {} }, { "sku": "NK21-20-XL", "brand": "FAG", "manufacturer_designation": "NK21/20-XL", "series": "nk-series", "type": "needle", "d_mm": 21, "D_mm": 29, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 19.3, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.5, "limiting_speed_rpm": 20600, "max_rpm": 20600, "reference_speed_rpm": 12300, "weight_g": 35.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 21×29×20 mm: 21 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 19.3 kN and C0 25.5 kN at the 21 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 29 mm outside diameter the fatigue load limit Cur is 4.5 kN, the limiting speed 20,600 r/min and the thermal reference speed 12,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 0.97 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 35.2 g, just 0.06 g per mm² of projected 29×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 21 mm bore this size balances the 29 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range NK21/20-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 20,600 r/min limit. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 29 mm outside diameter and 19.3 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 21 mm seat, and in agricultural machine pivots and linkages the 35.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 20 mm width and the published 25.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK21/20-XL?", "a": "The NK21/20-XL is a NK machined-ring needle roller bearing without inner ring with 29 mm outside diameter, 21 mm bore and 20 mm width, envelope 21×29×20 mm. Mass is 35.2 g." }, { "q": "What does the NK21/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK21/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 21×29×20 mm and the catalogue ratings are C 19.3 kN, C0 25.5 kN, Cur 4.5 kN." }, { "q": "What is the load capacity of the NK21/20-XL?", "a": "The basic dynamic load rating C is 19.3 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.5 kN." }, { "q": "What is the maximum speed of the NK21/20-XL?", "a": "The limiting speed is 20,600 r/min and the thermal reference speed is 12,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK21/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK21/20-XL has no inner ring, so the 21 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK21-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK21-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 21×29×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK21-20-XL", "NK21/20-XL" ], "locale_variants": {} }, { "sku": "NK22-16-XL", "brand": "FAG", "manufacturer_designation": "NK22/16-XL", "series": "nk-series", "type": "needle", "d_mm": 22, "D_mm": 30, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.8, "static_load_kN": 19.9, "fatigue_load_limit_kN": 3.75, "limiting_speed_rpm": 20000, "max_rpm": 20000, "reference_speed_rpm": 12000, "weight_g": 30, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×30×16 mm: 22 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 15.8 kN and C0 19.9 kN at the 22 mm seat; the C/C0 ratio of 0.79 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 3.75 kN, the limiting speed 20,000 r/min and the thermal reference speed 12,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.72 kN/mm and per millimetre of width 0.99 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 30 g, just 0.06 g per mm² of projected 30×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 22 mm bore the 16 mm width and 15.8 kN C rating suit high-cycle industrial machinery rather than instrument duty This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces Omitting the inner ring frees radial space — at a 22 mm shaft the outer diameter is only 30 mm and the width 16 mm, yet C is 15.8 kN X-life status (-XL) indicates the current Schaeffler premium execution at 22 mm bore; the 19.9 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 30 mm outside diameter and 15.8 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 22 mm seat, and in planetary gear bearings the 30 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 16 mm width and the published 19.9 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NK22/16-XL?", "a": "The NK22/16-XL is a NK machined-ring needle roller bearing without inner ring with 30 mm outside diameter, 22 mm bore and 16 mm width, envelope 22×30×16 mm. Mass is 30 g." }, { "q": "What does the NK22/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK22/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×30×16 mm and the catalogue ratings are C 15.8 kN, C0 19.9 kN, Cur 3.75 kN." }, { "q": "What is the load capacity of the NK22/16-XL?", "a": "The basic dynamic load rating C is 15.8 kN and the basic static load rating C0 is 19.9 kN; the fatigue load limit Cur is 3.75 kN." }, { "q": "What is the maximum speed of the NK22/16-XL?", "a": "The limiting speed is 20,000 r/min and the thermal reference speed is 12,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK22/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK22/16-XL has no inner ring, so the 22 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK22-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×30×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK22-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK22-16-XL", "NK22/16-XL" ], "locale_variants": {} }, { "sku": "NK22-20-XL", "brand": "FAG", "manufacturer_designation": "NK22/20-XL", "series": "nk-series", "type": "needle", "d_mm": 22, "D_mm": 30, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 20, "static_load_kN": 27, "fatigue_load_limit_kN": 4.8, "limiting_speed_rpm": 20000, "max_rpm": 20000, "reference_speed_rpm": 11700, "weight_g": 37, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×30×20 mm: 22 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 20 kN and C0 27 kN at the 22 mm seat; the C/C0 ratio of 0.74 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 4.8 kN, the limiting speed 20,000 r/min and the thermal reference speed 11,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.91 kN/mm and per millimetre of width 1.00 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 37 g, just 0.06 g per mm² of projected 30×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 22 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The thin 4.0 mm section makes the 37 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 20,000 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 30 mm outside diameter and 20 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 22 mm seat, and in copying and printing machine mechanisms the 37 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 27 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK22/20-XL?", "a": "The NK22/20-XL is a NK machined-ring needle roller bearing without inner ring with 30 mm outside diameter, 22 mm bore and 20 mm width, envelope 22×30×20 mm. Mass is 37 g." }, { "q": "What does the NK22/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK22/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×30×20 mm and the catalogue ratings are C 20 kN, C0 27 kN, Cur 4.8 kN." }, { "q": "What is the load capacity of the NK22/20-XL?", "a": "The basic dynamic load rating C is 20 kN and the basic static load rating C0 is 27 kN; the fatigue load limit Cur is 4.8 kN." }, { "q": "What is the maximum speed of the NK22/20-XL?", "a": "The limiting speed is 20,000 r/min and the thermal reference speed is 11,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK22/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK22/20-XL has no inner ring, so the 22 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK22-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK22-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×30×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK22-20-XL", "NK22/20-XL" ], "locale_variants": {} }, { "sku": "RNA4903-XL", "brand": "FAG", "manufacturer_designation": "RNA4903-XL", "series": "rna49-series", "type": "needle", "d_mm": 22, "D_mm": 30, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.4, "static_load_kN": 14.6, "fatigue_load_limit_kN": 2.65, "limiting_speed_rpm": 20000, "max_rpm": 20000, "reference_speed_rpm": 10900, "weight_g": 22.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×30×13 mm: 22 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 12.4 kN and C0 14.6 kN at the 22 mm seat; the C/C0 ratio of 0.85 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 2.65 kN, the limiting speed 20,000 r/min and the thermal reference speed 10,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.56 kN/mm and per millimetre of width 0.95 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 22.2 g, just 0.06 g per mm² of projected 30×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 22 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty RNA4903-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality With Cur 2.65 kN and a 20,000 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 12.4 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 30 mm outside diameter and 12.4 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 22 mm seat, and in two-stroke and compressor piston pins the 22.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 13 mm width and the published 14.6 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA4903-XL?", "a": "The RNA4903-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 30 mm outside diameter, 22 mm bore and 13 mm width, envelope 22×30×13 mm. Mass is 22.2 g." }, { "q": "What does the RNA4903-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4903-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×30×13 mm and the catalogue ratings are C 12.4 kN, C0 14.6 kN, Cur 2.65 kN." }, { "q": "What is the load capacity of the RNA4903-XL?", "a": "The basic dynamic load rating C is 12.4 kN and the basic static load rating C0 is 14.6 kN; the fatigue load limit Cur is 2.65 kN." }, { "q": "What is the maximum speed of the RNA4903-XL?", "a": "The limiting speed is 20,000 r/min and the thermal reference speed is 10,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4903-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4903-XL has no inner ring, so the 22 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4903", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×30×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×30×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4903-XL", "RNA4903-XL" ], "locale_variants": {} }, { "sku": "RNA6903-XL", "brand": "FAG", "manufacturer_designation": "RNA6903-XL", "series": "rna69-series", "type": "needle", "d_mm": 22, "D_mm": 30, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.1, "static_load_kN": 29, "fatigue_load_limit_kN": 5.2, "limiting_speed_rpm": 20000, "max_rpm": 20000, "reference_speed_rpm": 10500, "weight_g": 42.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×30×23 mm: 22 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 21.1 kN and C0 29 kN at the 22 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 5.2 kN, the limiting speed 20,000 r/min and the thermal reference speed 10,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 0.92 kN/mm — the reason 23 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 42.4 g, just 0.06 g per mm² of projected 30×23 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 22 mm bore the 23 mm width and 21.1 kN C rating suit high-cycle industrial machinery rather than instrument duty The hardness requirement is unforgiving: below about 58 HRC the 22 mm journal brinels under the 29 kN static rating, and roughness above raceway finish accelerates roller wear Omitting the inner ring frees radial space — at a 22 mm shaft the outer diameter is only 30 mm and the width 23 mm, yet C is 21.1 kN As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 5.2 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 30 mm outside diameter and 21.1 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 22 mm seat, and in gearbox selector and change linkages the 42.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 23 mm width and the published 29 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNA6903-XL?", "a": "The RNA6903-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 30 mm outside diameter, 22 mm bore and 23 mm width, envelope 22×30×23 mm. Mass is 42.4 g." }, { "q": "What does the RNA6903-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6903-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×30×23 mm and the catalogue ratings are C 21.1 kN, C0 29 kN, Cur 5.2 kN." }, { "q": "What is the load capacity of the RNA6903-XL?", "a": "The basic dynamic load rating C is 21.1 kN and the basic static load rating C0 is 29 kN; the fatigue load limit Cur is 5.2 kN." }, { "q": "What is the maximum speed of the RNA6903-XL?", "a": "The limiting speed is 20,000 r/min and the thermal reference speed is 10,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6903-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6903-XL has no inner ring, so the 22 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6903", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×30×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6903-XL", "RNA6903-XL" ], "locale_variants": {} }, { "sku": "NKS22-XL", "brand": "FAG", "manufacturer_designation": "NKS22-XL", "series": "nks-series", "type": "needle", "d_mm": 22, "D_mm": 35, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.5, "static_load_kN": 28, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 18500, "max_rpm": 18500, "reference_speed_rpm": 10900, "weight_g": 61.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×35×20 mm: 22 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 28 kN at the 22 mm seat; the C/C0 ratio of 0.98 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 5 kN, the limiting speed 18,500 r/min and the thermal reference speed 10,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.25 kN/mm and per millimetre of width 1.38 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 61.5 g, just 0.09 g per mm² of projected 35×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 22 mm bore this size balances the 35 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The thin 6.5 mm section makes the 61.5 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting With Cur 5 kN and a 18,500 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 18,500 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 35 mm outside diameter and 27.5 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 22 mm seat, and in copying and printing machine mechanisms the 61.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 28 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKS22-XL?", "a": "The NKS22-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 35 mm outside diameter, 22 mm bore and 20 mm width, envelope 22×35×20 mm. Mass is 61.5 g." }, { "q": "What does the NKS22-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS22-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×35×20 mm and the catalogue ratings are C 27.5 kN, C0 28 kN, Cur 5 kN." }, { "q": "What is the load capacity of the NKS22-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 28 kN; the fatigue load limit Cur is 5 kN." }, { "q": "What is the maximum speed of the NKS22-XL?", "a": "The limiting speed is 18,500 r/min and the thermal reference speed is 10,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS22-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS22-XL has no inner ring, so the 22 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS22", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS22-XL", "NKS22-XL" ], "locale_variants": {} }, { "sku": "NK24-16-XL", "brand": "FAG", "manufacturer_designation": "NK24/16-XL", "series": "nk-series", "type": "needle", "d_mm": 24, "D_mm": 32, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.9, "static_load_kN": 22.3, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 18500, "max_rpm": 18500, "reference_speed_rpm": 11000, "weight_g": 31.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×32×16 mm: 24 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 16.9 kN and C0 22.3 kN at the 24 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 4.2 kN, the limiting speed 18,500 r/min and the thermal reference speed 11,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.70 kN/mm and per millimetre of width 1.06 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 31.9 g, just 0.06 g per mm² of projected 32×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 24 mm bore this size balances the 32 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range With Cur 4.2 kN and a 18,500 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins Omitting the inner ring frees radial space — at a 24 mm shaft the outer diameter is only 32 mm and the width 16 mm, yet C is 16.9 kN X-life status (-XL) indicates the current Schaeffler premium execution at 24 mm bore; the 22.3 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 32 mm outside diameter and 16.9 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 24 mm seat, and in two-stroke and compressor piston pins the 31.9 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 16 mm width and the published 22.3 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK24/16-XL?", "a": "The NK24/16-XL is a NK machined-ring needle roller bearing without inner ring with 32 mm outside diameter, 24 mm bore and 16 mm width, envelope 24×32×16 mm. Mass is 31.9 g." }, { "q": "What does the NK24/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK24/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 24×32×16 mm and the catalogue ratings are C 16.9 kN, C0 22.3 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the NK24/16-XL?", "a": "The basic dynamic load rating C is 16.9 kN and the basic static load rating C0 is 22.3 kN; the fatigue load limit Cur is 4.2 kN." }, { "q": "What is the maximum speed of the NK24/16-XL?", "a": "The limiting speed is 18,500 r/min and the thermal reference speed is 11,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK24/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK24/16-XL has no inner ring, so the 24 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK24-16", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NK24-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK24-16-XL", "NK24/16-XL" ], "locale_variants": {} }, { "sku": "NK24-20-XL", "brand": "FAG", "manufacturer_designation": "NK24/20-XL", "series": "nk-series", "type": "needle", "d_mm": 24, "D_mm": 32, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.4, "static_load_kN": 30.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 18500, "max_rpm": 18500, "reference_speed_rpm": 10700, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×32×20 mm: 24 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 21.4 kN and C0 30.5 kN at the 24 mm seat; the C/C0 ratio of 0.70 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 5.4 kN, the limiting speed 18,500 r/min and the thermal reference speed 10,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.89 kN/mm and per millimetre of width 1.07 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 40 g, just 0.06 g per mm² of projected 32×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 24 mm bore the 20 mm width and 21.4 kN C rating suit high-cycle industrial machinery rather than instrument duty Omitting the inner ring frees radial space — at a 24 mm shaft the outer diameter is only 32 mm and the width 20 mm, yet C is 21.4 kN The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 24×32×20 mm envelope. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 32 mm outside diameter and 21.4 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 24 mm seat, and in connecting-rod small ends the 40 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 20 mm width and the published 30.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NK24/20-XL?", "a": "The NK24/20-XL is a NK machined-ring needle roller bearing without inner ring with 32 mm outside diameter, 24 mm bore and 20 mm width, envelope 24×32×20 mm. Mass is 40 g." }, { "q": "What does the NK24/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK24/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 24×32×20 mm and the catalogue ratings are C 21.4 kN, C0 30.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NK24/20-XL?", "a": "The basic dynamic load rating C is 21.4 kN and the basic static load rating C0 is 30.5 kN; the fatigue load limit Cur is 5.4 kN." }, { "q": "What is the maximum speed of the NK24/20-XL?", "a": "The limiting speed is 18,500 r/min and the thermal reference speed is 10,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK24/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK24/20-XL has no inner ring, so the 24 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK24-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK24-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 24×32×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK24-20-XL", "NK24/20-XL" ], "locale_variants": {} }, { "sku": "NKS24-XL", "brand": "FAG", "manufacturer_designation": "NKS24-XL", "series": "nks-series", "type": "needle", "d_mm": 24, "D_mm": 37, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 29.5, "static_load_kN": 31, "fatigue_load_limit_kN": 5.5, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 10100, "weight_g": 65.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×37×20 mm: 24 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 29.5 kN and C0 31 kN at the 24 mm seat; the C/C0 ratio of 0.95 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 5.5 kN, the limiting speed 17,200 r/min and the thermal reference speed 10,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.23 kN/mm and per millimetre of width 1.48 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 65.5 g, just 0.09 g per mm² of projected 37×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 24 mm bore this size balances the 37 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range NKS24-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality Reading the NKS prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened X-life status (-XL) indicates the current Schaeffler premium execution at 24 mm bore; the 31 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 37 mm outside diameter and 29.5 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 24 mm seat, and in gearbox selector and change linkages the 65.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 20 mm width and the published 31 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKS24-XL?", "a": "The NKS24-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 37 mm outside diameter, 24 mm bore and 20 mm width, envelope 24×37×20 mm. Mass is 65.5 g." }, { "q": "What does the NKS24-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS24-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 24×37×20 mm and the catalogue ratings are C 29.5 kN, C0 31 kN, Cur 5.5 kN." }, { "q": "What is the load capacity of the NKS24-XL?", "a": "The basic dynamic load rating C is 29.5 kN and the basic static load rating C0 is 31 kN; the fatigue load limit Cur is 5.5 kN." }, { "q": "What is the maximum speed of the NKS24-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 10,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS24-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS24-XL has no inner ring, so the 24 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS24", "equiv_brand": "SKF", "level": "partial", "note": "Same 24×37×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS24-XL", "NKS24-XL" ], "locale_variants": {} }, { "sku": "NK25-16-XL", "brand": "FAG", "manufacturer_designation": "NK25/16-XL", "series": "nk-series", "type": "needle", "d_mm": 25, "D_mm": 33, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.8, "static_load_kN": 22.4, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 17800, "max_rpm": 17800, "reference_speed_rpm": 10700, "weight_g": 32.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×33×16 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 16.8 kN and C0 22.4 kN at the 25 mm seat; the C/C0 ratio of 0.75 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 33 mm outside diameter the fatigue load limit Cur is 4.2 kN, the limiting speed 17,800 r/min and the thermal reference speed 10,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.67 kN/mm and per millimetre of width 1.05 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 32.6 g, just 0.06 g per mm² of projected 33×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 25 mm bore this size balances the 33 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The hardness requirement is unforgiving: below about 58 HRC the 25 mm journal brinels under the 22.4 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 17,800 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 33 mm outside diameter and 16.8 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 25 mm seat, and in hydraulic and pneumatic pump eccentrics the 32.6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 16 mm width and the published 22.4 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK25/16-XL?", "a": "The NK25/16-XL is a NK machined-ring needle roller bearing without inner ring with 33 mm outside diameter, 25 mm bore and 16 mm width, envelope 25×33×16 mm. Mass is 32.6 g." }, { "q": "What does the NK25/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK25/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×33×16 mm and the catalogue ratings are C 16.8 kN, C0 22.4 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the NK25/16-XL?", "a": "The basic dynamic load rating C is 16.8 kN and the basic static load rating C0 is 22.4 kN; the fatigue load limit Cur is 4.2 kN." }, { "q": "What is the maximum speed of the NK25/16-XL?", "a": "The limiting speed is 17,800 r/min and the thermal reference speed is 10,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK25/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK25/16-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK25-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×33×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK25-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK25-16-XL", "NK25/16-XL" ], "locale_variants": {} }, { "sku": "NK25-20-XL", "brand": "FAG", "manufacturer_designation": "NK25/20-XL", "series": "nk-series", "type": "needle", "d_mm": 25, "D_mm": 33, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.3, "static_load_kN": 30.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 17800, "max_rpm": 17800, "reference_speed_rpm": 10400, "weight_g": 42, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×33×20 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 21.3 kN and C0 30.5 kN at the 25 mm seat; the C/C0 ratio of 0.70 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 33 mm outside diameter the fatigue load limit Cur is 5.4 kN, the limiting speed 17,800 r/min and the thermal reference speed 10,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.85 kN/mm and per millimetre of width 1.06 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 42 g, just 0.06 g per mm² of projected 33×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 25 mm bore the 20 mm width and 21.3 kN C rating suit high-cycle industrial machinery rather than instrument duty The thin 4.0 mm section makes the 42 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 25×33×20 mm envelope. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 33 mm outside diameter and 21.3 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 25 mm seat, and in textile machine heald and cam shafts the 42 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 30.5 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK25/20-XL?", "a": "The NK25/20-XL is a NK machined-ring needle roller bearing without inner ring with 33 mm outside diameter, 25 mm bore and 20 mm width, envelope 25×33×20 mm. Mass is 42 g." }, { "q": "What does the NK25/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK25/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×33×20 mm and the catalogue ratings are C 21.3 kN, C0 30.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NK25/20-XL?", "a": "The basic dynamic load rating C is 21.3 kN and the basic static load rating C0 is 30.5 kN; the fatigue load limit Cur is 5.4 kN." }, { "q": "What is the maximum speed of the NK25/20-XL?", "a": "The limiting speed is 17,800 r/min and the thermal reference speed is 10,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK25/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK25/20-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK25-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK25-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×33×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK25-20-XL", "NK25/20-XL" ], "locale_variants": {} }, { "sku": "RNA4904-XL", "brand": "FAG", "manufacturer_designation": "RNA4904-XL", "series": "rna49-series", "type": "needle", "d_mm": 25, "D_mm": 37, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.7, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.7, "limiting_speed_rpm": 16900, "max_rpm": 16900, "reference_speed_rpm": 9900, "weight_g": 52.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×37×17 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 23.7 kN and C0 25.5 kN at the 25 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 4.7 kN, the limiting speed 16,900 r/min and the thermal reference speed 9,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.95 kN/mm and per millimetre of width 1.39 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 52.3 g, just 0.08 g per mm² of projected 37×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The hardness requirement is unforgiving: below about 58 HRC the 25 mm journal brinels under the 25.5 kN static rating, and roughness above raceway finish accelerates roller wear -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 23.7 kN C rating and longer nominal life come without an envelope change. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 37 mm outside diameter and 23.7 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 25 mm seat, and in planetary gear bearings the 52.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 17 mm width and the published 25.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA4904-XL?", "a": "The RNA4904-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 37 mm outside diameter, 25 mm bore and 17 mm width, envelope 25×37×17 mm. Mass is 52.3 g." }, { "q": "What does the RNA4904-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4904-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×37×17 mm and the catalogue ratings are C 23.7 kN, C0 25.5 kN, Cur 4.7 kN." }, { "q": "What is the load capacity of the RNA4904-XL?", "a": "The basic dynamic load rating C is 23.7 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.7 kN." }, { "q": "What is the maximum speed of the RNA4904-XL?", "a": "The limiting speed is 16,900 r/min and the thermal reference speed is 9,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4904-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4904-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4904", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "RNA4904-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×17 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4904-XL", "RNA4904-XL" ], "locale_variants": {} }, { "sku": "RNA6904-XL", "brand": "FAG", "manufacturer_designation": "RNA6904-XL", "series": "rna69-series", "type": "needle", "d_mm": 25, "D_mm": 37, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 40.5, "static_load_kN": 51, "fatigue_load_limit_kN": 9.2, "limiting_speed_rpm": 16900, "max_rpm": 16900, "reference_speed_rpm": 9500, "weight_g": 100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×37×30 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 40.5 kN and C0 51 kN at the 25 mm seat; the C/C0 ratio of 0.79 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 9.2 kN, the limiting speed 16,900 r/min and the thermal reference speed 9,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.62 kN/mm and per millimetre of width 1.35 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 100 g, just 0.09 g per mm² of projected 37×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 25 mm bore the 30 mm width and 40.5 kN C rating suit high-cycle industrial machinery rather than instrument duty The hardness requirement is unforgiving: below about 58 HRC the 25 mm journal brinels under the 51 kN static rating, and roughness above raceway finish accelerates roller wear Reading the RNA69 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 40.5 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 37 mm outside diameter and 40.5 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 25 mm seat, and in two-stroke and compressor piston pins the 100 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 30 mm width and the published 51 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA6904-XL?", "a": "The RNA6904-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 37 mm outside diameter, 25 mm bore and 30 mm width, envelope 25×37×30 mm. Mass is 100 g." }, { "q": "What does the RNA6904-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6904-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×37×30 mm and the catalogue ratings are C 40.5 kN, C0 51 kN, Cur 9.2 kN." }, { "q": "What is the load capacity of the RNA6904-XL?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 51 kN; the fatigue load limit Cur is 9.2 kN." }, { "q": "What is the maximum speed of the RNA6904-XL?", "a": "The limiting speed is 16,900 r/min and the thermal reference speed is 9,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6904-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6904-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6904", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×37×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6904-XL", "RNA6904-XL" ], "locale_variants": {} }, { "sku": "NKS25-XL", "brand": "FAG", "manufacturer_designation": "NKS25-XL", "series": "nks-series", "type": "needle", "d_mm": 25, "D_mm": 38, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31, "static_load_kN": 33.5, "fatigue_load_limit_kN": 5.9, "limiting_speed_rpm": 16600, "max_rpm": 16600, "reference_speed_rpm": 9700, "weight_g": 68.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×38×20 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 31 kN and C0 33.5 kN at the 25 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 38 mm outside diameter the fatigue load limit Cur is 5.9 kN, the limiting speed 16,600 r/min and the thermal reference speed 9,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.24 kN/mm and per millimetre of width 1.55 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 68.1 g, just 0.09 g per mm² of projected 38×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 25 mm bore this size balances the 38 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The thin 6.5 mm section makes the 68.1 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The hardness requirement is unforgiving: below about 58 HRC the 25 mm journal brinels under the 33.5 kN static rating, and roughness above raceway finish accelerates roller wear X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 33.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 38 mm outside diameter and 31 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 25 mm seat, and in agricultural machine pivots and linkages the 68.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 20 mm width and the published 33.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKS25-XL?", "a": "The NKS25-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 38 mm outside diameter, 25 mm bore and 20 mm width, envelope 25×38×20 mm. Mass is 68.1 g." }, { "q": "What does the NKS25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS25-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×38×20 mm and the catalogue ratings are C 31 kN, C0 33.5 kN, Cur 5.9 kN." }, { "q": "What is the load capacity of the NKS25-XL?", "a": "The basic dynamic load rating C is 31 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 5.9 kN." }, { "q": "What is the maximum speed of the NKS25-XL?", "a": "The limiting speed is 16,600 r/min and the thermal reference speed is 9,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS25-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS25", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×38×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS25-XL", "NKS25-XL" ], "locale_variants": {} }, { "sku": "NK26-16-XL", "brand": "FAG", "manufacturer_designation": "NK26/16-XL", "series": "nk-series", "type": "needle", "d_mm": 26, "D_mm": 34, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 17.3, "static_load_kN": 23.6, "fatigue_load_limit_kN": 4.45, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 10300, "weight_g": 34, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 26×34×16 mm: 26 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 17.3 kN and C0 23.6 kN at the 26 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 34 mm outside diameter the fatigue load limit Cur is 4.45 kN, the limiting speed 17,200 r/min and the thermal reference speed 10,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.67 kN/mm and per millimetre of width 1.08 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 34 g, just 0.06 g per mm² of projected 34×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 26 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Omitting the inner ring frees radial space — at a 26 mm shaft the outer diameter is only 34 mm and the width 16 mm, yet C is 17.3 kN This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 17,200 r/min limit. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 34 mm outside diameter and 17.3 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 26 mm seat, and in gearbox selector and change linkages the 34 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 16 mm width and the published 23.6 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK26/16-XL?", "a": "The NK26/16-XL is a NK machined-ring needle roller bearing without inner ring with 34 mm outside diameter, 26 mm bore and 16 mm width, envelope 26×34×16 mm. Mass is 34 g." }, { "q": "What does the NK26/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK26/16-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 26×34×16 mm and the catalogue ratings are C 17.3 kN, C0 23.6 kN, Cur 4.45 kN." }, { "q": "What is the load capacity of the NK26/16-XL?", "a": "The basic dynamic load rating C is 17.3 kN and the basic static load rating C0 is 23.6 kN; the fatigue load limit Cur is 4.45 kN." }, { "q": "What is the maximum speed of the NK26/16-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 10,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK26/16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK26/16-XL has no inner ring, so the 26 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK26-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 26×34×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK26-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK26-16-XL", "NK26/16-XL" ], "locale_variants": {} }, { "sku": "NK26-20-XL", "brand": "FAG", "manufacturer_designation": "NK26/20-XL", "series": "nk-series", "type": "needle", "d_mm": 26, "D_mm": 34, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22, "static_load_kN": 32, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 10100, "weight_g": 42, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 26×34×20 mm: 26 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 22 kN and C0 32 kN at the 26 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 34 mm outside diameter the fatigue load limit Cur is 5.7 kN, the limiting speed 17,200 r/min and the thermal reference speed 10,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.85 kN/mm and per millimetre of width 1.10 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 42 g, just 0.06 g per mm² of projected 34×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 26 mm bore this size balances the 34 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened Omitting the inner ring frees radial space — at a 26 mm shaft the outer diameter is only 34 mm and the width 20 mm, yet C is 22 kN The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 26×34×20 mm envelope. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 34 mm outside diameter and 22 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 26 mm seat, and in hydraulic and pneumatic pump eccentrics the 42 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 32 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK26/20-XL?", "a": "The NK26/20-XL is a NK machined-ring needle roller bearing without inner ring with 34 mm outside diameter, 26 mm bore and 20 mm width, envelope 26×34×20 mm. Mass is 42 g." }, { "q": "What does the NK26/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK26/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 26×34×20 mm and the catalogue ratings are C 22 kN, C0 32 kN, Cur 5.7 kN." }, { "q": "What is the load capacity of the NK26/20-XL?", "a": "The basic dynamic load rating C is 22 kN and the basic static load rating C0 is 32 kN; the fatigue load limit Cur is 5.7 kN." }, { "q": "What is the maximum speed of the NK26/20-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 10,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK26/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK26/20-XL has no inner ring, so the 26 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK26-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK26-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 26×34×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK26-20-XL", "NK26/20-XL" ], "locale_variants": {} }, { "sku": "NK28-20-D-XL", "brand": "FAG", "manufacturer_designation": "NK28/20-D-XL", "series": "nk-series", "type": "needle", "d_mm": 28, "D_mm": 37, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 29, "static_load_kN": 41.5, "fatigue_load_limit_kN": 7.5, "limiting_speed_rpm": 15800, "max_rpm": 15800, "reference_speed_rpm": 8800, "weight_g": 58, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×37×20 mm: 28 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.5 mm radial section packed with small-diameter needle rollers C is 29 kN and C0 41.5 kN at the 28 mm seat; the C/C0 ratio of 0.70 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 7.5 kN, the limiting speed 15,800 r/min and the thermal reference speed 8,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.04 kN/mm and per millimetre of width 1.45 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 58 g, just 0.08 g per mm² of projected 37×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 28 mm bore this size balances the 37 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 28×37×20 mm envelope. The split -D cage targets positions where the shaft cannot be threaded through an intact bearing; seating and axial retention must follow the mounting instructions. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 37 mm outside diameter and 29 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 28 mm seat, and in two-stroke and compressor piston pins the 58 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 20 mm width and the published 41.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK28/20-D-XL?", "a": "The NK28/20-D-XL is a NK machined-ring needle roller bearing without inner ring with 37 mm outside diameter, 28 mm bore and 20 mm width, envelope 28×37×20 mm. Mass is 58 g." }, { "q": "What does the NK28/20-D-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK28/20-D-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×37×20 mm and the catalogue ratings are C 29 kN, C0 41.5 kN, Cur 7.5 kN." }, { "q": "What is the load capacity of the NK28/20-D-XL?", "a": "The basic dynamic load rating C is 29 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 7.5 kN." }, { "q": "What is the maximum speed of the NK28/20-D-XL?", "a": "The limiting speed is 15,800 r/min and the thermal reference speed is 8,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK28/20-D-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK28/20-D-XL has no inner ring, so the 28 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK28-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×37×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK28-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK28-20-D-XL", "NK28/20-D-XL" ], "locale_variants": {} }, { "sku": "NK28-20-XL", "brand": "FAG", "manufacturer_designation": "NK28/20-XL", "series": "nk-series", "type": "needle", "d_mm": 28, "D_mm": 37, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 24.8, "static_load_kN": 34, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 15800, "max_rpm": 15800, "reference_speed_rpm": 9300, "weight_g": 52.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×37×20 mm: 28 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.5 mm radial section packed with small-diameter needle rollers C is 24.8 kN and C0 34 kN at the 28 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 6 kN, the limiting speed 15,800 r/min and the thermal reference speed 9,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.89 kN/mm and per millimetre of width 1.24 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 52.2 g, just 0.07 g per mm² of projected 37×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 28 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened Omitting the inner ring frees radial space — at a 28 mm shaft the outer diameter is only 37 mm and the width 20 mm, yet C is 24.8 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 24.8 kN C rating and longer nominal life come without an envelope change. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 37 mm outside diameter and 24.8 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 28 mm seat, and in motorcycle and light-vehicle transmissions the 52.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 20 mm width and the published 34 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK28/20-XL?", "a": "The NK28/20-XL is a NK machined-ring needle roller bearing without inner ring with 37 mm outside diameter, 28 mm bore and 20 mm width, envelope 28×37×20 mm. Mass is 52.2 g." }, { "q": "What does the NK28/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK28/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×37×20 mm and the catalogue ratings are C 24.8 kN, C0 34 kN, Cur 6 kN." }, { "q": "What is the load capacity of the NK28/20-XL?", "a": "The basic dynamic load rating C is 24.8 kN and the basic static load rating C0 is 34 kN; the fatigue load limit Cur is 6 kN." }, { "q": "What is the maximum speed of the NK28/20-XL?", "a": "The limiting speed is 15,800 r/min and the thermal reference speed is 9,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK28/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK28/20-XL has no inner ring, so the 28 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK28-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×37×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK28-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK28-20-XL", "NK28/20-XL" ], "locale_variants": {} }, { "sku": "NK28-30-XL", "brand": "FAG", "manufacturer_designation": "NK28/30-XL", "series": "nk-series", "type": "needle", "d_mm": 28, "D_mm": 37, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 57, "fatigue_load_limit_kN": 10.7, "limiting_speed_rpm": 15800, "max_rpm": 15800, "reference_speed_rpm": 9000, "weight_g": 82, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×37×30 mm: 28 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.5 mm radial section packed with small-diameter needle rollers C is 37 kN and C0 57 kN at the 28 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 10.7 kN, the limiting speed 15,800 r/min and the thermal reference speed 9,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.32 kN/mm and per millimetre of width 1.23 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 82 g, just 0.07 g per mm² of projected 37×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 28 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The thin 4.5 mm section makes the 82 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 28×37×30 mm envelope. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 37 mm outside diameter and 37 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 28 mm seat, and in gearbox selector and change linkages the 82 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 57 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK28/30-XL?", "a": "The NK28/30-XL is a NK machined-ring needle roller bearing without inner ring with 37 mm outside diameter, 28 mm bore and 30 mm width, envelope 28×37×30 mm. Mass is 82 g." }, { "q": "What does the NK28/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK28/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×37×30 mm and the catalogue ratings are C 37 kN, C0 57 kN, Cur 10.7 kN." }, { "q": "What is the load capacity of the NK28/30-XL?", "a": "The basic dynamic load rating C is 37 kN and the basic static load rating C0 is 57 kN; the fatigue load limit Cur is 10.7 kN." }, { "q": "What is the maximum speed of the NK28/30-XL?", "a": "The limiting speed is 15,800 r/min and the thermal reference speed is 9,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK28/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK28/30-XL has no inner ring, so the 28 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK28-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK28-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×37×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK28-30-XL", "NK28/30-XL" ], "locale_variants": {} }, { "sku": "RNA49-22-XL", "brand": "FAG", "manufacturer_designation": "RNA49/22-XL", "series": "rna49-series", "type": "needle", "d_mm": 28, "D_mm": 39, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 29.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 8600, "weight_g": 50.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×39×17 mm: 28 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.5 mm radial section packed with small-diameter needle rollers C is 26 kN and C0 29.5 kN at the 28 mm seat; the C/C0 ratio of 0.88 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 39 mm outside diameter the fatigue load limit Cur is 5.4 kN, the limiting speed 15,300 r/min and the thermal reference speed 8,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 1.53 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 50.2 g, just 0.08 g per mm² of projected 39×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 28 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 5.4 kN and a 15,300 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 28×39×17 mm envelope. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 39 mm outside diameter and 26 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 28 mm seat, and in agricultural machine pivots and linkages the 50.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 17 mm width and the published 29.5 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNA49/22-XL?", "a": "The RNA49/22-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 39 mm outside diameter, 28 mm bore and 17 mm width, envelope 28×39×17 mm. Mass is 50.2 g." }, { "q": "What does the RNA49/22-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA49/22-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×39×17 mm and the catalogue ratings are C 26 kN, C0 29.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the RNA49/22-XL?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 29.5 kN; the fatigue load limit Cur is 5.4 kN." }, { "q": "What is the maximum speed of the RNA49/22-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 8,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA49/22-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA49/22-XL has no inner ring, so the 28 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA49-22", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×39×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA49-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA49-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA49-22-XL", "RNA49/22-XL" ], "locale_variants": {} }, { "sku": "RNA69-22-XL", "brand": "FAG", "manufacturer_designation": "RNA69/22-XL", "series": "rna69-series", "type": "needle", "d_mm": 28, "D_mm": 39, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 55, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 8400, "weight_g": 98, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×39×30 mm: 28 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.5 mm radial section packed with small-diameter needle rollers C is 42 kN and C0 55 kN at the 28 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 39 mm outside diameter the fatigue load limit Cur is 10 kN, the limiting speed 15,300 r/min and the thermal reference speed 8,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.50 kN/mm and per millimetre of width 1.40 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 98 g, just 0.08 g per mm² of projected 39×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 28 mm bore this size balances the 39 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The hardness requirement is unforgiving: below about 58 HRC the 28 mm journal brinels under the 55 kN static rating, and roughness above raceway finish accelerates roller wear X-life status (-XL) indicates the current Schaeffler premium execution at 28 mm bore; the 55 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 39 mm outside diameter and 42 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 28 mm seat, and in two-stroke and compressor piston pins the 98 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 30 mm width and the published 55 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA69/22-XL?", "a": "The RNA69/22-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 39 mm outside diameter, 28 mm bore and 30 mm width, envelope 28×39×30 mm. Mass is 98 g." }, { "q": "What does the RNA69/22-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA69/22-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×39×30 mm and the catalogue ratings are C 42 kN, C0 55 kN, Cur 10 kN." }, { "q": "What is the load capacity of the RNA69/22-XL?", "a": "The basic dynamic load rating C is 42 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 10 kN." }, { "q": "What is the maximum speed of the RNA69/22-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 8,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA69/22-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA69/22-XL has no inner ring, so the 28 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA69-22", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×39×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA69-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA69-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA69-22-XL", "RNA69/22-XL" ], "locale_variants": {} }, { "sku": "NKS28-XL", "brand": "FAG", "manufacturer_designation": "NKS28-XL", "series": "nks-series", "type": "needle", "d_mm": 28, "D_mm": 42, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 6.5, "limiting_speed_rpm": 15100, "max_rpm": 15100, "reference_speed_rpm": 8900, "weight_g": 83.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×42×20 mm: 28 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 32.5 kN and C0 36.5 kN at the 28 mm seat; the C/C0 ratio of 0.89 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 6.5 kN, the limiting speed 15,100 r/min and the thermal reference speed 8,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.16 kN/mm and per millimetre of width 1.63 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 83.6 g, just 0.10 g per mm² of projected 42×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 28 mm bore this size balances the 42 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The thin 7.0 mm section makes the 83.6 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 6.5 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 42 mm outside diameter and 32.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 28 mm seat, and in connecting-rod small ends the 83.6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 20 mm width and the published 36.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKS28-XL?", "a": "The NKS28-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 42 mm outside diameter, 28 mm bore and 20 mm width, envelope 28×42×20 mm. Mass is 83.6 g." }, { "q": "What does the NKS28-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS28-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×42×20 mm and the catalogue ratings are C 32.5 kN, C0 36.5 kN, Cur 6.5 kN." }, { "q": "What is the load capacity of the NKS28-XL?", "a": "The basic dynamic load rating C is 32.5 kN and the basic static load rating C0 is 36.5 kN; the fatigue load limit Cur is 6.5 kN." }, { "q": "What is the maximum speed of the NKS28-XL?", "a": "The limiting speed is 15,100 r/min and the thermal reference speed is 8,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS28-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS28-XL has no inner ring, so the 28 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS28", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×42×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS28-XL", "NKS28-XL" ], "locale_variants": {} }, { "sku": "NK29-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NK29/20-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 29, "D_mm": 38, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 27.5, "static_load_kN": 39, "fatigue_load_limit_kN": 7, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 8700, "weight_g": 50, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 29×38×20 mm: 29 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.5 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 39 kN at the 29 mm seat; the C/C0 ratio of 0.71 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 38 mm outside diameter the fatigue load limit Cur is 7 kN, the limiting speed 15,300 r/min and the thermal reference speed 8,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.95 kN/mm and per millimetre of width 1.38 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 50 g, just 0.07 g per mm² of projected 38×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 29 mm bore the 20 mm width and 27.5 kN C rating suit high-cycle industrial machinery rather than instrument duty With Cur 7 kN and a 15,300 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The hardness requirement is unforgiving: below about 58 HRC the 29 mm journal brinels under the 39 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 29×38×20 mm envelope. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 50 g in the 38 mm envelope. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 38 mm outside diameter and 27.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 29 mm seat, and in connecting-rod small ends the 50 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 20 mm width and the published 39 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK29/20-TV-XL?", "a": "The NK29/20-TV-XL is a NK machined-ring needle roller bearing without inner ring with 38 mm outside diameter, 29 mm bore and 20 mm width, envelope 29×38×20 mm. Mass is 50 g." }, { "q": "What does the NK29/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK29/20-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 29×38×20 mm and the catalogue ratings are C 27.5 kN, C0 39 kN, Cur 7 kN." }, { "q": "What is the load capacity of the NK29/20-TV-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 39 kN; the fatigue load limit Cur is 7 kN." }, { "q": "What is the maximum speed of the NK29/20-TV-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 8,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK29/20-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK29/20-TV-XL has no inner ring, so the 29 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK29-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 29×38×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK29-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK29-20-TV-XL", "NK29/20-TV-XL" ], "locale_variants": {} }, { "sku": "NK29-30-XL", "brand": "FAG", "manufacturer_designation": "NK29/30-XL", "series": "nk-series", "type": "needle", "d_mm": 29, "D_mm": 38, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 57, "fatigue_load_limit_kN": 10.7, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 8800, "weight_g": 84.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 29×38×30 mm: 29 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.5 mm radial section packed with small-diameter needle rollers C is 37 kN and C0 57 kN at the 29 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 38 mm outside diameter the fatigue load limit Cur is 10.7 kN, the limiting speed 15,300 r/min and the thermal reference speed 8,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.28 kN/mm and per millimetre of width 1.23 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 84.3 g, just 0.07 g per mm² of projected 38×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 29 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The hardness requirement is unforgiving: below about 58 HRC the 29 mm journal brinels under the 57 kN static rating, and roughness above raceway finish accelerates roller wear This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 29×38×30 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 38 mm outside diameter and 37 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 29 mm seat, and in planetary gear bearings the 84.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 57 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK29/30-XL?", "a": "The NK29/30-XL is a NK machined-ring needle roller bearing without inner ring with 38 mm outside diameter, 29 mm bore and 30 mm width, envelope 29×38×30 mm. Mass is 84.3 g." }, { "q": "What does the NK29/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK29/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 29×38×30 mm and the catalogue ratings are C 37 kN, C0 57 kN, Cur 10.7 kN." }, { "q": "What is the load capacity of the NK29/30-XL?", "a": "The basic dynamic load rating C is 37 kN and the basic static load rating C0 is 57 kN; the fatigue load limit Cur is 10.7 kN." }, { "q": "What is the maximum speed of the NK29/30-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 8,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK29/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK29/30-XL has no inner ring, so the 29 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK29-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK29-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 29×38×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=949", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK29-30-XL", "NK29/30-XL" ], "locale_variants": {} }, { "sku": "NK30-20-TW-XL", "brand": "FAG", "manufacturer_designation": "NK30/20-TW-XL", "series": "nk-series", "type": "needle", "d_mm": 30, "D_mm": 40, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.5, "static_load_kN": 35.5, "fatigue_load_limit_kN": 7.4, "limiting_speed_rpm": 14800, "max_rpm": 14800, "reference_speed_rpm": 8900, "weight_g": 61, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×40×20 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 35.5 kN at the 30 mm seat; the C/C0 ratio of 0.77 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 40 mm outside diameter the fatigue load limit Cur is 7.4 kN, the limiting speed 14,800 r/min and the thermal reference speed 8,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 1.38 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 61 g, just 0.08 g per mm² of projected 40×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 30 mm bore this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 27.5 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 40 mm outside diameter and 27.5 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 30 mm seat, and in two-stroke and compressor piston pins the 61 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 20 mm width and the published 35.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK30/20-TW-XL?", "a": "The NK30/20-TW-XL is a NK machined-ring needle roller bearing without inner ring with 40 mm outside diameter, 30 mm bore and 20 mm width, envelope 30×40×20 mm. Mass is 61 g." }, { "q": "What does the NK30/20-TW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK30/20-TW-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×40×20 mm and the catalogue ratings are C 27.5 kN, C0 35.5 kN, Cur 7.4 kN." }, { "q": "What is the load capacity of the NK30/20-TW-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 35.5 kN; the fatigue load limit Cur is 7.4 kN." }, { "q": "What is the maximum speed of the NK30/20-TW-XL?", "a": "The limiting speed is 14,800 r/min and the thermal reference speed is 8,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK30/20-TW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK30/20-TW-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK30-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×40×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK30-30-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK30-20-TW-XL", "NK30/20-TW-XL" ], "locale_variants": {} }, { "sku": "NK30-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NK30/20-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 30, "D_mm": 40, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 28, "static_load_kN": 41, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 14800, "max_rpm": 14800, "reference_speed_rpm": 8500, "weight_g": 61, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×40×20 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 28 kN and C0 41 kN at the 30 mm seat; the C/C0 ratio of 0.68 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 40 mm outside diameter the fatigue load limit Cur is 7.3 kN, the limiting speed 14,800 r/min and the thermal reference speed 8,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 1.40 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 61 g, just 0.08 g per mm² of projected 40×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 30 mm bore this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range With Cur 7.3 kN and a 14,800 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 28 kN C rating and longer nominal life come without an envelope change. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 14,800 r/min. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 40 mm outside diameter and 28 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 30 mm seat, and in textile machine heald and cam shafts the 61 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 41 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK30/20-TV-XL?", "a": "The NK30/20-TV-XL is a NK machined-ring needle roller bearing without inner ring with 40 mm outside diameter, 30 mm bore and 20 mm width, envelope 30×40×20 mm. Mass is 61 g." }, { "q": "What does the NK30/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK30/20-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×40×20 mm and the catalogue ratings are C 28 kN, C0 41 kN, Cur 7.3 kN." }, { "q": "What is the load capacity of the NK30/20-TV-XL?", "a": "The basic dynamic load rating C is 28 kN and the basic static load rating C0 is 41 kN; the fatigue load limit Cur is 7.3 kN." }, { "q": "What is the maximum speed of the NK30/20-TV-XL?", "a": "The limiting speed is 14,800 r/min and the thermal reference speed is 8,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK30/20-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK30/20-TV-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK30-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×40×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK30-30-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK30-20-TV-XL", "NK30/20-TV-XL" ], "locale_variants": {} }, { "sku": "NK30-30-TV-XL", "brand": "FAG", "manufacturer_designation": "NK30/30-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 30, "D_mm": 40, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 42, "static_load_kN": 69, "fatigue_load_limit_kN": 12.9, "limiting_speed_rpm": 14800, "max_rpm": 14800, "reference_speed_rpm": 8200, "weight_g": 92.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×40×30 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 42 kN and C0 69 kN at the 30 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 40 mm outside diameter the fatigue load limit Cur is 12.9 kN, the limiting speed 14,800 r/min and the thermal reference speed 8,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.40 kN/mm and per millimetre of width 1.40 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 92.4 g, just 0.08 g per mm² of projected 40×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty With Cur 12.9 kN and a 14,800 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins Omitting the inner ring frees radial space — at a 30 mm shaft the outer diameter is only 40 mm and the width 30 mm, yet C is 42 kN The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 30×40×30 mm envelope. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 40 mm outside diameter and 42 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 30 mm seat, and in motorcycle and light-vehicle transmissions the 92.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 30 mm width and the published 69 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK30/30-TV-XL?", "a": "The NK30/30-TV-XL is a NK machined-ring needle roller bearing without inner ring with 40 mm outside diameter, 30 mm bore and 30 mm width, envelope 30×40×30 mm. Mass is 92.4 g." }, { "q": "What does the NK30/30-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK30/30-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×40×30 mm and the catalogue ratings are C 42 kN, C0 69 kN, Cur 12.9 kN." }, { "q": "What is the load capacity of the NK30/30-TV-XL?", "a": "The basic dynamic load rating C is 42 kN and the basic static load rating C0 is 69 kN; the fatigue load limit Cur is 12.9 kN." }, { "q": "What is the maximum speed of the NK30/30-TV-XL?", "a": "The limiting speed is 14,800 r/min and the thermal reference speed is 8,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK30/30-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK30/30-TV-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK30-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK30-30-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×40×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK30-30-TV-XL", "NK30/30-TV-XL" ], "locale_variants": {} }, { "sku": "RNA4905-XL", "brand": "FAG", "manufacturer_designation": "RNA4905-XL", "series": "rna49-series", "type": "needle", "d_mm": 30, "D_mm": 42, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 5.8, "limiting_speed_rpm": 14400, "max_rpm": 14400, "reference_speed_rpm": 8100, "weight_g": 61, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×42×17 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 26.5 kN and C0 31.5 kN at the 30 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 5.8 kN, the limiting speed 14,400 r/min and the thermal reference speed 8,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 1.56 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 61 g, just 0.09 g per mm² of projected 42×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The thin 6.0 mm section makes the 61 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Omitting the inner ring frees radial space — at a 30 mm shaft the outer diameter is only 42 mm and the width 17 mm, yet C is 26.5 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 26.5 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 42 mm outside diameter and 26.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 30 mm seat, and in hydraulic and pneumatic pump eccentrics the 61 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 17 mm width and the published 31.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4905-XL?", "a": "The RNA4905-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 42 mm outside diameter, 30 mm bore and 17 mm width, envelope 30×42×17 mm. Mass is 61 g." }, { "q": "What does the RNA4905-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4905-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×42×17 mm and the catalogue ratings are C 26.5 kN, C0 31.5 kN, Cur 5.8 kN." }, { "q": "What is the load capacity of the RNA4905-XL?", "a": "The basic dynamic load rating C is 26.5 kN and the basic static load rating C0 is 31.5 kN; the fatigue load limit Cur is 5.8 kN." }, { "q": "What is the maximum speed of the RNA4905-XL?", "a": "The limiting speed is 14,400 r/min and the thermal reference speed is 8,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4905-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4905-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4905", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "RNA4905-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×17 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4905-XL", "RNA4905-XL" ], "locale_variants": {} }, { "sku": "RNA6905-XL", "brand": "FAG", "manufacturer_designation": "RNA6905-XL", "series": "rna69-series", "type": "needle", "d_mm": 30, "D_mm": 42, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44, "static_load_kN": 59, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 14400, "max_rpm": 14400, "reference_speed_rpm": 7900, "weight_g": 112, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×42×30 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 44 kN and C0 59 kN at the 30 mm seat; the C/C0 ratio of 0.75 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 10.8 kN, the limiting speed 14,400 r/min and the thermal reference speed 7,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.47 kN/mm and per millimetre of width 1.47 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 112 g, just 0.09 g per mm² of projected 42×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 30 mm width and 44 kN C rating suit high-cycle industrial machinery rather than instrument duty This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 10.8 kN and a 14,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 44 kN C rating and longer nominal life come without an envelope change. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 42 mm outside diameter and 44 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 30 mm seat, and in planetary gear bearings the 112 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 59 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNA6905-XL?", "a": "The RNA6905-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 42 mm outside diameter, 30 mm bore and 30 mm width, envelope 30×42×30 mm. Mass is 112 g." }, { "q": "What does the RNA6905-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6905-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×42×30 mm and the catalogue ratings are C 44 kN, C0 59 kN, Cur 10.8 kN." }, { "q": "What is the load capacity of the RNA6905-XL?", "a": "The basic dynamic load rating C is 44 kN and the basic static load rating C0 is 59 kN; the fatigue load limit Cur is 10.8 kN." }, { "q": "What is the maximum speed of the RNA6905-XL?", "a": "The limiting speed is 14,400 r/min and the thermal reference speed is 7,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6905-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6905-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6905", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×42×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6905-XL", "RNA6905-XL" ], "locale_variants": {} }, { "sku": "NKS30-XL", "brand": "FAG", "manufacturer_designation": "NKS30-XL", "series": "nks-series", "type": "needle", "d_mm": 30, "D_mm": 45, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 36.5, "static_load_kN": 40, "fatigue_load_limit_kN": 7, "limiting_speed_rpm": 14000, "max_rpm": 14000, "reference_speed_rpm": 8500, "weight_g": 104, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×45×22 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 36.5 kN and C0 40 kN at the 30 mm seat; the C/C0 ratio of 0.91 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 7 kN, the limiting speed 14,000 r/min and the thermal reference speed 8,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.22 kN/mm and per millimetre of width 1.66 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 104 g, just 0.11 g per mm² of projected 45×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 22 mm width and 36.5 kN C rating suit high-cycle industrial machinery rather than instrument duty The hardness requirement is unforgiving: below about 58 HRC the 30 mm journal brinels under the 40 kN static rating, and roughness above raceway finish accelerates roller wear This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 40 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 45 mm outside diameter and 36.5 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 30 mm seat, and in copying and printing machine mechanisms the 104 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 22 mm width and the published 40 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKS30-XL?", "a": "The NKS30-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 45 mm outside diameter, 30 mm bore and 22 mm width, envelope 30×45×22 mm. Mass is 104 g." }, { "q": "What does the NKS30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS30-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×45×22 mm and the catalogue ratings are C 36.5 kN, C0 40 kN, Cur 7 kN." }, { "q": "What is the load capacity of the NKS30-XL?", "a": "The basic dynamic load rating C is 36.5 kN and the basic static load rating C0 is 40 kN; the fatigue load limit Cur is 7 kN." }, { "q": "What is the maximum speed of the NKS30-XL?", "a": "The limiting speed is 14,000 r/min and the thermal reference speed is 8,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS30-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS30", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×45×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS30-XL", "NKS30-XL" ], "locale_variants": {} }, { "sku": "NK32-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NK32/20-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 32, "D_mm": 42, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 29.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 8, "limiting_speed_rpm": 14000, "max_rpm": 14000, "reference_speed_rpm": 8000, "weight_g": 64, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×42×20 mm: 32 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 29.5 kN and C0 44.5 kN at the 32 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 8 kN, the limiting speed 14,000 r/min and the thermal reference speed 8,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 1.48 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 64 g, just 0.08 g per mm² of projected 42×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 32 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened Omitting the inner ring frees radial space — at a 32 mm shaft the outer diameter is only 42 mm and the width 20 mm, yet C is 29.5 kN The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 14,000 r/min limit. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 14,000 r/min. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 42 mm outside diameter and 29.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 32 mm seat, and in hydraulic and pneumatic pump eccentrics the 64 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 44.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK32/20-TV-XL?", "a": "The NK32/20-TV-XL is a NK machined-ring needle roller bearing without inner ring with 42 mm outside diameter, 32 mm bore and 20 mm width, envelope 32×42×20 mm. Mass is 64 g." }, { "q": "What does the NK32/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK32/20-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×42×20 mm and the catalogue ratings are C 29.5 kN, C0 44.5 kN, Cur 8 kN." }, { "q": "What is the load capacity of the NK32/20-TV-XL?", "a": "The basic dynamic load rating C is 29.5 kN and the basic static load rating C0 is 44.5 kN; the fatigue load limit Cur is 8 kN." }, { "q": "What is the maximum speed of the NK32/20-TV-XL?", "a": "The limiting speed is 14,000 r/min and the thermal reference speed is 8,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK32/20-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK32/20-TV-XL has no inner ring, so the 32 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK32-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×42×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK32-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK32-20-TV-XL", "NK32/20-TV-XL" ], "locale_variants": {} }, { "sku": "NK32-30-XL", "brand": "FAG", "manufacturer_designation": "NK32/30-XL", "series": "nk-series", "type": "needle", "d_mm": 32, "D_mm": 42, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 39, "static_load_kN": 63, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 14000, "max_rpm": 14000, "reference_speed_rpm": 8200, "weight_g": 102, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×42×30 mm: 32 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 39 kN and C0 63 kN at the 32 mm seat; the C/C0 ratio of 0.62 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 11.9 kN, the limiting speed 14,000 r/min and the thermal reference speed 8,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.22 kN/mm and per millimetre of width 1.30 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 102 g, just 0.08 g per mm² of projected 42×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 32 mm bore places this bearing in the medium band, where the 42 mm envelope already carries ratings in the tens of kilonewtons NK32/30-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11.9 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 42 mm outside diameter and 39 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 32 mm seat, and in small electric motor accessory drives the 102 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 30 mm width and the published 63 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK32/30-XL?", "a": "The NK32/30-XL is a NK machined-ring needle roller bearing without inner ring with 42 mm outside diameter, 32 mm bore and 30 mm width, envelope 32×42×30 mm. Mass is 102 g." }, { "q": "What does the NK32/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK32/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×42×30 mm and the catalogue ratings are C 39 kN, C0 63 kN, Cur 11.9 kN." }, { "q": "What is the load capacity of the NK32/30-XL?", "a": "The basic dynamic load rating C is 39 kN and the basic static load rating C0 is 63 kN; the fatigue load limit Cur is 11.9 kN." }, { "q": "What is the maximum speed of the NK32/30-XL?", "a": "The limiting speed is 14,000 r/min and the thermal reference speed is 8,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK32/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK32/30-XL has no inner ring, so the 32 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK32-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK32-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×42×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK32-30-XL", "NK32/30-XL" ], "locale_variants": {} }, { "sku": "RNA49-28-XL", "brand": "FAG", "manufacturer_designation": "RNA49/28-XL", "series": "rna49-series", "type": "needle", "d_mm": 32, "D_mm": 45, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 13600, "max_rpm": 13600, "reference_speed_rpm": 7600, "weight_g": 73.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×45×17 mm: 32 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 33.5 kN at the 32 mm seat; the C/C0 ratio of 0.82 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 6.2 kN, the limiting speed 13,600 r/min and the thermal reference speed 7,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.86 kN/mm and per millimetre of width 1.62 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 73.2 g, just 0.10 g per mm² of projected 45×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 32 mm bore marks the medium range: mounting forces and fits become critical, and the 73.2 g mass calls for proper induction or press tooling rather than hand fitting Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The thin 6.5 mm section makes the 73.2 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting X-life status (-XL) indicates the current Schaeffler premium execution at 32 mm bore; the 33.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 45 mm outside diameter and 27.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 32 mm seat, and in motorcycle and light-vehicle transmissions the 73.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 17 mm width and the published 33.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA49/28-XL?", "a": "The RNA49/28-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 45 mm outside diameter, 32 mm bore and 17 mm width, envelope 32×45×17 mm. Mass is 73.2 g." }, { "q": "What does the RNA49/28-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA49/28-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×45×17 mm and the catalogue ratings are C 27.5 kN, C0 33.5 kN, Cur 6.2 kN." }, { "q": "What is the load capacity of the RNA49/28-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 6.2 kN." }, { "q": "What is the maximum speed of the RNA49/28-XL?", "a": "The limiting speed is 13,600 r/min and the thermal reference speed is 7,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA49/28-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA49/28-XL has no inner ring, so the 32 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA49-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA49-28", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "RNA49-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA49-28-XL", "RNA49/28-XL" ], "locale_variants": {} }, { "sku": "RNA69-28-XL", "brand": "FAG", "manufacturer_designation": "RNA69/28-XL", "series": "rna69-series", "type": "needle", "d_mm": 32, "D_mm": 45, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 63, "fatigue_load_limit_kN": 11.6, "limiting_speed_rpm": 13600, "max_rpm": 13600, "reference_speed_rpm": 7400, "weight_g": 135, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×45×30 mm: 32 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 45.5 kN and C0 63 kN at the 32 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 11.6 kN, the limiting speed 13,600 r/min and the thermal reference speed 7,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.42 kN/mm and per millimetre of width 1.52 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 135 g, just 0.10 g per mm² of projected 45×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 32 mm bore places this bearing in the medium band, where the 45 mm envelope already carries ratings in the tens of kilonewtons RNA69/28-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The hardness requirement is unforgiving: below about 58 HRC the 32 mm journal brinels under the 63 kN static rating, and roughness above raceway finish accelerates roller wear -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 45.5 kN C rating and longer nominal life come without an envelope change. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 45 mm outside diameter and 45.5 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 32 mm seat, and in planetary gear bearings the 135 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 63 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA69/28-XL?", "a": "The RNA69/28-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 45 mm outside diameter, 32 mm bore and 30 mm width, envelope 32×45×30 mm. Mass is 135 g." }, { "q": "What does the RNA69/28-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA69/28-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×45×30 mm and the catalogue ratings are C 45.5 kN, C0 63 kN, Cur 11.6 kN." }, { "q": "What is the load capacity of the RNA69/28-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 63 kN; the fatigue load limit Cur is 11.6 kN." }, { "q": "What is the maximum speed of the RNA69/28-XL?", "a": "The limiting speed is 13,600 r/min and the thermal reference speed is 7,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA69/28-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA69/28-XL has no inner ring, so the 32 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA69-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA69-28", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×45×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA69-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA69-28-XL", "RNA69/28-XL" ], "locale_variants": {} }, { "sku": "NKS32-XL", "brand": "FAG", "manufacturer_designation": "NKS32-XL", "series": "nks-series", "type": "needle", "d_mm": 32, "D_mm": 47, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38, "static_load_kN": 43.5, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 13200, "max_rpm": 13200, "reference_speed_rpm": 8000, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×47×22 mm: 32 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 38 kN and C0 43.5 kN at the 32 mm seat; the C/C0 ratio of 0.87 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 7.6 kN, the limiting speed 13,200 r/min and the thermal reference speed 8,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.19 kN/mm and per millimetre of width 1.73 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 110 g, just 0.11 g per mm² of projected 47×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 32 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space The hardness requirement is unforgiving: below about 58 HRC the 32 mm journal brinels under the 43.5 kN static rating, and roughness above raceway finish accelerates roller wear Omitting the inner ring frees radial space — at a 32 mm shaft the outer diameter is only 47 mm and the width 22 mm, yet C is 38 kN X-life status (-XL) indicates the current Schaeffler premium execution at 32 mm bore; the 43.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 47 mm outside diameter and 38 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 32 mm seat, and in motorcycle and light-vehicle transmissions the 110 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 22 mm width and the published 43.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NKS32-XL?", "a": "The NKS32-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 47 mm outside diameter, 32 mm bore and 22 mm width, envelope 32×47×22 mm. Mass is 110 g." }, { "q": "What does the NKS32-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS32-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×47×22 mm and the catalogue ratings are C 38 kN, C0 43.5 kN, Cur 7.6 kN." }, { "q": "What is the load capacity of the NKS32-XL?", "a": "The basic dynamic load rating C is 38 kN and the basic static load rating C0 is 43.5 kN; the fatigue load limit Cur is 7.6 kN." }, { "q": "What is the maximum speed of the NKS32-XL?", "a": "The limiting speed is 13,200 r/min and the thermal reference speed is 8,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS32-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS32-XL has no inner ring, so the 32 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS32", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×47×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS32-XL", "NKS32-XL" ], "locale_variants": {} }, { "sku": "NK35-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NK35/20-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 35, "D_mm": 45, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 31, "static_load_kN": 48.5, "fatigue_load_limit_kN": 8.6, "limiting_speed_rpm": 12900, "max_rpm": 12900, "reference_speed_rpm": 7400, "weight_g": 69.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×45×20 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 31 kN and C0 48.5 kN at the 35 mm seat; the C/C0 ratio of 0.64 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 8.6 kN, the limiting speed 12,900 r/min and the thermal reference speed 7,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.89 kN/mm and per millimetre of width 1.55 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 69.4 g, just 0.08 g per mm² of projected 45×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 45 mm envelope already carries ratings in the tens of kilonewtons Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened NK35/20-TV-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 12,900 r/min limit. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 12,900 r/min. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 45 mm outside diameter and 31 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 35 mm seat, and in agricultural machine pivots and linkages the 69.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 20 mm width and the published 48.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK35/20-TV-XL?", "a": "The NK35/20-TV-XL is a NK machined-ring needle roller bearing without inner ring with 45 mm outside diameter, 35 mm bore and 20 mm width, envelope 35×45×20 mm. Mass is 69.4 g." }, { "q": "What does the NK35/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK35/20-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×45×20 mm and the catalogue ratings are C 31 kN, C0 48.5 kN, Cur 8.6 kN." }, { "q": "What is the load capacity of the NK35/20-TV-XL?", "a": "The basic dynamic load rating C is 31 kN and the basic static load rating C0 is 48.5 kN; the fatigue load limit Cur is 8.6 kN." }, { "q": "What is the maximum speed of the NK35/20-TV-XL?", "a": "The limiting speed is 12,900 r/min and the thermal reference speed is 7,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK35/20-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK35/20-TV-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK35-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×45×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK35-30-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK35-20-TV-XL", "NK35/20-TV-XL" ], "locale_variants": {} }, { "sku": "NK35-30-TV-XL", "brand": "FAG", "manufacturer_designation": "NK35/30-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 35, "D_mm": 45, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 46, "static_load_kN": 81, "fatigue_load_limit_kN": 15.3, "limiting_speed_rpm": 12900, "max_rpm": 12900, "reference_speed_rpm": 7100, "weight_g": 106, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×45×30 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 46 kN and C0 81 kN at the 35 mm seat; the C/C0 ratio of 0.57 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 15.3 kN, the limiting speed 12,900 r/min and the thermal reference speed 7,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.31 kN/mm and per millimetre of width 1.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 106 g, just 0.08 g per mm² of projected 45×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 35 mm bore marks the medium range: mounting forces and fits become critical, and the 106 g mass calls for proper induction or press tooling rather than hand fitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 15.3 kN and a 12,900 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins X-life status (-XL) indicates the current Schaeffler premium execution at 35 mm bore; the 81 kN C0 rating reflects the improved rolling-contact geometry. With the -TV polyamide cage the rollers are positively separated, so the 35 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 45 mm outside diameter and 46 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 35 mm seat, and in connecting-rod small ends the 106 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 81 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK35/30-TV-XL?", "a": "The NK35/30-TV-XL is a NK machined-ring needle roller bearing without inner ring with 45 mm outside diameter, 35 mm bore and 30 mm width, envelope 35×45×30 mm. Mass is 106 g." }, { "q": "What does the NK35/30-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK35/30-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×45×30 mm and the catalogue ratings are C 46 kN, C0 81 kN, Cur 15.3 kN." }, { "q": "What is the load capacity of the NK35/30-TV-XL?", "a": "The basic dynamic load rating C is 46 kN and the basic static load rating C0 is 81 kN; the fatigue load limit Cur is 15.3 kN." }, { "q": "What is the maximum speed of the NK35/30-TV-XL?", "a": "The limiting speed is 12,900 r/min and the thermal reference speed is 7,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK35/30-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK35/30-TV-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK35-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK35-30-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×45×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK35-30-TV-XL", "NK35/30-TV-XL" ], "locale_variants": {} }, { "sku": "RNA4906-XL", "brand": "FAG", "manufacturer_designation": "RNA4906-XL", "series": "rna49-series", "type": "needle", "d_mm": 35, "D_mm": 47, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.5, "static_load_kN": 35.5, "fatigue_load_limit_kN": 6.6, "limiting_speed_rpm": 12600, "max_rpm": 12600, "reference_speed_rpm": 6900, "weight_g": 69.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×47×17 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 28.5 kN and C0 35.5 kN at the 35 mm seat; the C/C0 ratio of 0.80 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 6.6 kN, the limiting speed 12,600 r/min and the thermal reference speed 6,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.81 kN/mm and per millimetre of width 1.68 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 69.4 g, just 0.09 g per mm² of projected 47×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 47 mm envelope already carries ratings in the tens of kilonewtons RNA4906-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The hardness requirement is unforgiving: below about 58 HRC the 35 mm journal brinels under the 35.5 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 35×47×17 mm envelope. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 47 mm outside diameter and 28.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 35 mm seat, and in small electric motor accessory drives the 69.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 17 mm width and the published 35.5 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA4906-XL?", "a": "The RNA4906-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 47 mm outside diameter, 35 mm bore and 17 mm width, envelope 35×47×17 mm. Mass is 69.4 g." }, { "q": "What does the RNA4906-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4906-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×47×17 mm and the catalogue ratings are C 28.5 kN, C0 35.5 kN, Cur 6.6 kN." }, { "q": "What is the load capacity of the RNA4906-XL?", "a": "The basic dynamic load rating C is 28.5 kN and the basic static load rating C0 is 35.5 kN; the fatigue load limit Cur is 6.6 kN." }, { "q": "What is the maximum speed of the RNA4906-XL?", "a": "The limiting speed is 12,600 r/min and the thermal reference speed is 6,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4906-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4906-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4906", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4906-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×17 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4906-XL", "RNA4906-XL" ], "locale_variants": {} }, { "sku": "RNA6906-XL", "brand": "FAG", "manufacturer_designation": "RNA6906-XL", "series": "rna69-series", "type": "needle", "d_mm": 35, "D_mm": 47, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 49, "static_load_kN": 71, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 12600, "max_rpm": 12600, "reference_speed_rpm": 6600, "weight_g": 126, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×47×30 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 49 kN and C0 71 kN at the 35 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 13.1 kN, the limiting speed 12,600 r/min and the thermal reference speed 6,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.40 kN/mm and per millimetre of width 1.63 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 126 g, just 0.09 g per mm² of projected 47×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 35 mm bore marks the medium range: mounting forces and fits become critical, and the 126 g mass calls for proper induction or press tooling rather than hand fitting Reading the RNA69 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened With Cur 13.1 kN and a 12,600 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 49 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 47 mm outside diameter and 49 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 35 mm seat, and in hydraulic and pneumatic pump eccentrics the 126 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 30 mm width and the published 71 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA6906-XL?", "a": "The RNA6906-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 47 mm outside diameter, 35 mm bore and 30 mm width, envelope 35×47×30 mm. Mass is 126 g." }, { "q": "What does the RNA6906-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6906-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×47×30 mm and the catalogue ratings are C 49 kN, C0 71 kN, Cur 13.1 kN." }, { "q": "What is the load capacity of the RNA6906-XL?", "a": "The basic dynamic load rating C is 49 kN and the basic static load rating C0 is 71 kN; the fatigue load limit Cur is 13.1 kN." }, { "q": "What is the maximum speed of the RNA6906-XL?", "a": "The limiting speed is 12,600 r/min and the thermal reference speed is 6,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6906-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6906-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6906", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×47×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6906-XL", "RNA6906-XL" ], "locale_variants": {} }, { "sku": "NKS35-XL", "brand": "FAG", "manufacturer_designation": "NKS35-XL", "series": "nks-series", "type": "needle", "d_mm": 35, "D_mm": 50, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 39.5, "static_load_kN": 47, "fatigue_load_limit_kN": 8.2, "limiting_speed_rpm": 12300, "max_rpm": 12300, "reference_speed_rpm": 7400, "weight_g": 118, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×50×22 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 39.5 kN and C0 47 kN at the 35 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 8.2 kN, the limiting speed 12,300 r/min and the thermal reference speed 7,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 1.80 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 118 g, just 0.11 g per mm² of projected 50×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space With Cur 8.2 kN and a 12,300 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins Omitting the inner ring frees radial space — at a 35 mm shaft the outer diameter is only 50 mm and the width 22 mm, yet C is 39.5 kN As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 8.2 kN Cur value. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 50 mm outside diameter and 39.5 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 35 mm seat, and in rocker arms and valve trains the 118 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 22 mm width and the published 47 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NKS35-XL?", "a": "The NKS35-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 50 mm outside diameter, 35 mm bore and 22 mm width, envelope 35×50×22 mm. Mass is 118 g." }, { "q": "What does the NKS35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS35-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×50×22 mm and the catalogue ratings are C 39.5 kN, C0 47 kN, Cur 8.2 kN." }, { "q": "What is the load capacity of the NKS35-XL?", "a": "The basic dynamic load rating C is 39.5 kN and the basic static load rating C0 is 47 kN; the fatigue load limit Cur is 8.2 kN." }, { "q": "What is the maximum speed of the NKS35-XL?", "a": "The limiting speed is 12,300 r/min and the thermal reference speed is 7,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS35-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS35", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×50×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS35-XL", "NKS35-XL" ], "locale_variants": {} }, { "sku": "NK37-20-D-XL", "brand": "FAG", "manufacturer_designation": "NK37/20-D-XL", "series": "nk-series", "type": "needle", "d_mm": 37, "D_mm": 47, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34, "static_load_kN": 56, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 12300, "max_rpm": 12300, "reference_speed_rpm": 6800, "weight_g": 83, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 37×47×20 mm: 37 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 34 kN and C0 56 kN at the 37 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 10 kN, the limiting speed 12,300 r/min and the thermal reference speed 6,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 1.70 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 83 g, just 0.09 g per mm² of projected 47×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 37 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 34 kN C rating and longer nominal life come without an envelope change. -D marks the split-cage execution of the NK37/20-D-XL: the needle-cage assembly opens around the shaft while retaining the 34 kN C rating. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 47 mm outside diameter and 34 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 37 mm seat, and in two-stroke and compressor piston pins the 83 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 20 mm width and the published 56 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK37/20-D-XL?", "a": "The NK37/20-D-XL is a NK machined-ring needle roller bearing without inner ring with 47 mm outside diameter, 37 mm bore and 20 mm width, envelope 37×47×20 mm. Mass is 83 g." }, { "q": "What does the NK37/20-D-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK37/20-D-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 37×47×20 mm and the catalogue ratings are C 34 kN, C0 56 kN, Cur 10 kN." }, { "q": "What is the load capacity of the NK37/20-D-XL?", "a": "The basic dynamic load rating C is 34 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 10 kN." }, { "q": "What is the maximum speed of the NK37/20-D-XL?", "a": "The limiting speed is 12,300 r/min and the thermal reference speed is 6,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK37/20-D-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK37/20-D-XL has no inner ring, so the 37 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK37-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 37×47×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK37-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK37-20-D-XL", "NK37/20-D-XL" ], "locale_variants": {} }, { "sku": "NK37-20-XL", "brand": "FAG", "manufacturer_designation": "NK37/20-XL", "series": "nk-series", "type": "needle", "d_mm": 37, "D_mm": 47, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28, "static_load_kN": 43.5, "fatigue_load_limit_kN": 7.8, "limiting_speed_rpm": 12300, "max_rpm": 12300, "reference_speed_rpm": 7400, "weight_g": 77, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 37×47×20 mm: 37 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 28 kN and C0 43.5 kN at the 37 mm seat; the C/C0 ratio of 0.64 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 7.8 kN, the limiting speed 12,300 r/min and the thermal reference speed 7,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.76 kN/mm and per millimetre of width 1.40 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 77 g, just 0.08 g per mm² of projected 47×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 37 mm bore places this bearing in the medium band, where the 47 mm envelope already carries ratings in the tens of kilonewtons The hardness requirement is unforgiving: below about 58 HRC the 37 mm journal brinels under the 43.5 kN static rating, and roughness above raceway finish accelerates roller wear Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 37×47×20 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 47 mm outside diameter and 28 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 37 mm seat, and in planetary gear bearings the 77 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 20 mm width and the published 43.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK37/20-XL?", "a": "The NK37/20-XL is a NK machined-ring needle roller bearing without inner ring with 47 mm outside diameter, 37 mm bore and 20 mm width, envelope 37×47×20 mm. Mass is 77 g." }, { "q": "What does the NK37/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK37/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 37×47×20 mm and the catalogue ratings are C 28 kN, C0 43.5 kN, Cur 7.8 kN." }, { "q": "What is the load capacity of the NK37/20-XL?", "a": "The basic dynamic load rating C is 28 kN and the basic static load rating C0 is 43.5 kN; the fatigue load limit Cur is 7.8 kN." }, { "q": "What is the maximum speed of the NK37/20-XL?", "a": "The limiting speed is 12,300 r/min and the thermal reference speed is 7,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK37/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK37/20-XL has no inner ring, so the 37 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK37-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 37×47×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK37-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK37-20-XL", "NK37/20-XL" ], "locale_variants": {} }, { "sku": "NK37-30-XL", "brand": "FAG", "manufacturer_designation": "NK37/30-XL", "series": "nk-series", "type": "needle", "d_mm": 37, "D_mm": 47, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 73, "fatigue_load_limit_kN": 13.7, "limiting_speed_rpm": 12300, "max_rpm": 12300, "reference_speed_rpm": 7200, "weight_g": 113, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 37×47×30 mm: 37 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 42 kN and C0 73 kN at the 37 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 13.7 kN, the limiting speed 12,300 r/min and the thermal reference speed 7,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.14 kN/mm and per millimetre of width 1.40 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 113 g, just 0.08 g per mm² of projected 47×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 37 mm bore places this bearing in the medium band, where the 47 mm envelope already carries ratings in the tens of kilonewtons With Cur 13.7 kN and a 12,300 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The hardness requirement is unforgiving: below about 58 HRC the 37 mm journal brinels under the 73 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 12,300 r/min limit. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 47 mm outside diameter and 42 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 37 mm seat, and in textile machine heald and cam shafts the 113 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 73 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK37/30-XL?", "a": "The NK37/30-XL is a NK machined-ring needle roller bearing without inner ring with 47 mm outside diameter, 37 mm bore and 30 mm width, envelope 37×47×30 mm. Mass is 113 g." }, { "q": "What does the NK37/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK37/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 37×47×30 mm and the catalogue ratings are C 42 kN, C0 73 kN, Cur 13.7 kN." }, { "q": "What is the load capacity of the NK37/30-XL?", "a": "The basic dynamic load rating C is 42 kN and the basic static load rating C0 is 73 kN; the fatigue load limit Cur is 13.7 kN." }, { "q": "What is the maximum speed of the NK37/30-XL?", "a": "The limiting speed is 12,300 r/min and the thermal reference speed is 7,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK37/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK37/30-XL has no inner ring, so the 37 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK37-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK37-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 37×47×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK37-30-XL", "NK37/30-XL" ], "locale_variants": {} }, { "sku": "NKS37-XL", "brand": "FAG", "manufacturer_designation": "NKS37-XL", "series": "nks-series", "type": "needle", "d_mm": 37, "D_mm": 52, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 41.5, "static_load_kN": 50, "fatigue_load_limit_kN": 8.8, "limiting_speed_rpm": 11700, "max_rpm": 11700, "reference_speed_rpm": 7100, "weight_g": 123, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 37×52×22 mm: 37 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 41.5 kN and C0 50 kN at the 37 mm seat; the C/C0 ratio of 0.83 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 8.8 kN, the limiting speed 11,700 r/min and the thermal reference speed 7,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.12 kN/mm and per millimetre of width 1.89 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 123 g, just 0.11 g per mm² of projected 52×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 37 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space NKS37-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The thin 7.5 mm section makes the 123 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 41.5 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 52 mm outside diameter and 41.5 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 37 mm seat, and in two-stroke and compressor piston pins the 123 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 22 mm width and the published 50 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKS37-XL?", "a": "The NKS37-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 52 mm outside diameter, 37 mm bore and 22 mm width, envelope 37×52×22 mm. Mass is 123 g." }, { "q": "What does the NKS37-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS37-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 37×52×22 mm and the catalogue ratings are C 41.5 kN, C0 50 kN, Cur 8.8 kN." }, { "q": "What is the load capacity of the NKS37-XL?", "a": "The basic dynamic load rating C is 41.5 kN and the basic static load rating C0 is 50 kN; the fatigue load limit Cur is 8.8 kN." }, { "q": "What is the maximum speed of the NKS37-XL?", "a": "The limiting speed is 11,700 r/min and the thermal reference speed is 7,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS37-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS37-XL has no inner ring, so the 37 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS37", "equiv_brand": "SKF", "level": "partial", "note": "Same 37×52×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS37-XL", "NKS37-XL" ], "locale_variants": {} }, { "sku": "NK38-20-XL", "brand": "FAG", "manufacturer_designation": "NK38/20-XL", "series": "nk-series", "type": "needle", "d_mm": 38, "D_mm": 48, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 29, "static_load_kN": 45, "fatigue_load_limit_kN": 8.1, "limiting_speed_rpm": 12000, "max_rpm": 12000, "reference_speed_rpm": 7200, "weight_g": 79.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 38×48×20 mm: 38 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 29 kN and C0 45 kN at the 38 mm seat; the C/C0 ratio of 0.64 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 48 mm outside diameter the fatigue load limit Cur is 8.1 kN, the limiting speed 12,000 r/min and the thermal reference speed 7,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.76 kN/mm and per millimetre of width 1.45 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 79.4 g, just 0.08 g per mm² of projected 48×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 38 mm bore marks the medium range: mounting forces and fits become critical, and the 79.4 g mass calls for proper induction or press tooling rather than hand fitting Omitting the inner ring frees radial space — at a 38 mm shaft the outer diameter is only 48 mm and the width 20 mm, yet C is 29 kN The hardness requirement is unforgiving: below about 58 HRC the 38 mm journal brinels under the 45 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 38×48×20 mm envelope. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 48 mm outside diameter and 29 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 38 mm seat, and in rocker arms and valve trains the 79.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 20 mm width and the published 45 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK38/20-XL?", "a": "The NK38/20-XL is a NK machined-ring needle roller bearing without inner ring with 48 mm outside diameter, 38 mm bore and 20 mm width, envelope 38×48×20 mm. Mass is 79.4 g." }, { "q": "What does the NK38/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK38/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 38×48×20 mm and the catalogue ratings are C 29 kN, C0 45 kN, Cur 8.1 kN." }, { "q": "What is the load capacity of the NK38/20-XL?", "a": "The basic dynamic load rating C is 29 kN and the basic static load rating C0 is 45 kN; the fatigue load limit Cur is 8.1 kN." }, { "q": "What is the maximum speed of the NK38/20-XL?", "a": "The limiting speed is 12,000 r/min and the thermal reference speed is 7,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK38/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK38/20-XL has no inner ring, so the 38 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK38-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 38×48×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK38-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK38-20-XL", "NK38/20-XL" ], "locale_variants": {} }, { "sku": "NK38-30-XL", "brand": "FAG", "manufacturer_designation": "NK38/30-XL", "series": "nk-series", "type": "needle", "d_mm": 38, "D_mm": 48, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 43, "static_load_kN": 76, "fatigue_load_limit_kN": 14.3, "limiting_speed_rpm": 12000, "max_rpm": 12000, "reference_speed_rpm": 7000, "weight_g": 116, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 38×48×30 mm: 38 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 43 kN and C0 76 kN at the 38 mm seat; the C/C0 ratio of 0.57 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 48 mm outside diameter the fatigue load limit Cur is 14.3 kN, the limiting speed 12,000 r/min and the thermal reference speed 7,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 1.43 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 116 g, just 0.08 g per mm² of projected 48×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 38 mm bore marks the medium range: mounting forces and fits become critical, and the 116 g mass calls for proper induction or press tooling rather than hand fitting The hardness requirement is unforgiving: below about 58 HRC the 38 mm journal brinels under the 76 kN static rating, and roughness above raceway finish accelerates roller wear This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 12,000 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 48 mm outside diameter and 43 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 38 mm seat, and in hydraulic and pneumatic pump eccentrics the 116 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 30 mm width and the published 76 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK38/30-XL?", "a": "The NK38/30-XL is a NK machined-ring needle roller bearing without inner ring with 48 mm outside diameter, 38 mm bore and 30 mm width, envelope 38×48×30 mm. Mass is 116 g." }, { "q": "What does the NK38/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK38/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 38×48×30 mm and the catalogue ratings are C 43 kN, C0 76 kN, Cur 14.3 kN." }, { "q": "What is the load capacity of the NK38/30-XL?", "a": "The basic dynamic load rating C is 43 kN and the basic static load rating C0 is 76 kN; the fatigue load limit Cur is 14.3 kN." }, { "q": "What is the maximum speed of the NK38/30-XL?", "a": "The limiting speed is 12,000 r/min and the thermal reference speed is 7,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK38/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK38/30-XL has no inner ring, so the 38 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK38-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK38-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 38×48×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK38-30-XL", "NK38/30-XL" ], "locale_variants": {} }, { "sku": "NK40-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NK40/20-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 40, "D_mm": 50, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 33.5, "static_load_kN": 56, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 11400, "max_rpm": 11400, "reference_speed_rpm": 6500, "weight_g": 78, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×50×20 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 33.5 kN and C0 56 kN at the 40 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 10 kN, the limiting speed 11,400 r/min and the thermal reference speed 6,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.84 kN/mm and per millimetre of width 1.68 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 78 g, just 0.08 g per mm² of projected 50×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 50 mm envelope already carries ratings in the tens of kilonewtons This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 33.5 kN C rating and longer nominal life come without an envelope change. With the -TV polyamide cage the rollers are positively separated, so the 40 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 50 mm outside diameter and 33.5 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 40 mm seat, and in planetary gear bearings the 78 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 20 mm width and the published 56 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK40/20-TV-XL?", "a": "The NK40/20-TV-XL is a NK machined-ring needle roller bearing without inner ring with 50 mm outside diameter, 40 mm bore and 20 mm width, envelope 40×50×20 mm. Mass is 78 g." }, { "q": "What does the NK40/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK40/20-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×50×20 mm and the catalogue ratings are C 33.5 kN, C0 56 kN, Cur 10 kN." }, { "q": "What is the load capacity of the NK40/20-TV-XL?", "a": "The basic dynamic load rating C is 33.5 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 10 kN." }, { "q": "What is the maximum speed of the NK40/20-TV-XL?", "a": "The limiting speed is 11,400 r/min and the thermal reference speed is 6,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK40/20-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK40/20-TV-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK40-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×50×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK40-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK40-20-TV-XL", "NK40/20-TV-XL" ], "locale_variants": {} }, { "sku": "NK40-30-XL", "brand": "FAG", "manufacturer_designation": "NK40/30-XL", "series": "nk-series", "type": "needle", "d_mm": 40, "D_mm": 50, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44, "static_load_kN": 79, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 11400, "max_rpm": 11400, "reference_speed_rpm": 6700, "weight_g": 125, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×50×30 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 44 kN and C0 79 kN at the 40 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 14.9 kN, the limiting speed 11,400 r/min and the thermal reference speed 6,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.10 kN/mm and per millimetre of width 1.47 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 125 g, just 0.08 g per mm² of projected 50×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 50 mm envelope already carries ratings in the tens of kilonewtons With Cur 14.9 kN and a 11,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 44 kN C rating and longer nominal life come without an envelope change. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 50 mm outside diameter and 44 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 40 mm seat, and in agricultural machine pivots and linkages the 125 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 79 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK40/30-XL?", "a": "The NK40/30-XL is a NK machined-ring needle roller bearing without inner ring with 50 mm outside diameter, 40 mm bore and 30 mm width, envelope 40×50×30 mm. Mass is 125 g." }, { "q": "What does the NK40/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK40/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×50×30 mm and the catalogue ratings are C 44 kN, C0 79 kN, Cur 14.9 kN." }, { "q": "What is the load capacity of the NK40/30-XL?", "a": "The basic dynamic load rating C is 44 kN and the basic static load rating C0 is 79 kN; the fatigue load limit Cur is 14.9 kN." }, { "q": "What is the maximum speed of the NK40/30-XL?", "a": "The limiting speed is 11,400 r/min and the thermal reference speed is 6,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK40/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK40/30-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK40-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK40-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×50×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK40-30-XL", "NK40/30-XL" ], "locale_variants": {} }, { "sku": "RNA49-32-XL", "brand": "FAG", "manufacturer_designation": "RNA49/32-XL", "series": "rna49-series", "type": "needle", "d_mm": 40, "D_mm": 52, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 47.5, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 11100, "max_rpm": 11100, "reference_speed_rpm": 6400, "weight_g": 89.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×52×20 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 34.5 kN and C0 47.5 kN at the 40 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 11,100 r/min and the thermal reference speed 6,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.86 kN/mm and per millimetre of width 1.73 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 89.1 g, just 0.09 g per mm² of projected 52×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 52 mm envelope already carries ratings in the tens of kilonewtons RNA49/32-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 11,100 r/min limit. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 52 mm outside diameter and 34.5 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 40 mm seat, and in rocker arms and valve trains the 89.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 20 mm width and the published 47.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA49/32-XL?", "a": "The RNA49/32-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 52 mm outside diameter, 40 mm bore and 20 mm width, envelope 40×52×20 mm. Mass is 89.1 g." }, { "q": "What does the RNA49/32-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA49/32-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×52×20 mm and the catalogue ratings are C 34.5 kN, C0 47.5 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the RNA49/32-XL?", "a": "The basic dynamic load rating C is 34.5 kN and the basic static load rating C0 is 47.5 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the RNA49/32-XL?", "a": "The limiting speed is 11,100 r/min and the thermal reference speed is 6,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA49/32-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA49/32-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA49-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA49-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA49-32", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA49-32-XL", "RNA49/32-XL" ], "locale_variants": {} }, { "sku": "RNA69-32-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA69/32-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 40, "D_mm": 52, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 82, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 11100, "max_rpm": 11100, "reference_speed_rpm": 6500, "weight_g": 162, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×52×36 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 53 kN and C0 82 kN at the 40 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 15.4 kN, the limiting speed 11,100 r/min and the thermal reference speed 6,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.32 kN/mm and per millimetre of width 1.47 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 162 g, just 0.09 g per mm² of projected 52×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 40 mm bore marks the medium range: mounting forces and fits become critical, and the 162 g mass calls for proper induction or press tooling rather than hand fitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces Reading the RNA69 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 11,100 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 40×52 mm ring pair, giving the 53 kN C rating in a housing space sized for a wide single bearing. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 52 mm outside diameter and 53 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 40 mm seat, and in copying and printing machine mechanisms the 162 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 36 mm width and the published 82 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA69/32-ZW-XL?", "a": "The RNA69/32-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 52 mm outside diameter, 40 mm bore and 36 mm width, envelope 40×52×36 mm. Mass is 162 g." }, { "q": "What does the RNA69/32-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA69/32-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×52×36 mm and the catalogue ratings are C 53 kN, C0 82 kN, Cur 15.4 kN." }, { "q": "What is the load capacity of the RNA69/32-ZW-XL?", "a": "The basic dynamic load rating C is 53 kN and the basic static load rating C0 is 82 kN; the fatigue load limit Cur is 15.4 kN." }, { "q": "What is the maximum speed of the RNA69/32-ZW-XL?", "a": "The limiting speed is 11,100 r/min and the thermal reference speed is 6,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA69/32-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA69/32-ZW-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA69-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA69-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "RNA69-32", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×52×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA69-32-ZW-XL", "RNA69/32-ZW-XL" ], "locale_variants": {} }, { "sku": "NKS40-XL", "brand": "FAG", "manufacturer_designation": "NKS40-XL", "series": "nks-series", "type": "needle", "d_mm": 40, "D_mm": 55, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42.5, "static_load_kN": 54, "fatigue_load_limit_kN": 9.4, "limiting_speed_rpm": 10900, "max_rpm": 10900, "reference_speed_rpm": 6600, "weight_g": 129, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×55×22 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 42.5 kN and C0 54 kN at the 40 mm seat; the C/C0 ratio of 0.79 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 9.4 kN, the limiting speed 10,900 r/min and the thermal reference speed 6,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.06 kN/mm and per millimetre of width 1.93 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 129 g, just 0.11 g per mm² of projected 55×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 40 mm bore marks the medium range: mounting forces and fits become critical, and the 129 g mass calls for proper induction or press tooling rather than hand fitting Omitting the inner ring frees radial space — at a 40 mm shaft the outer diameter is only 55 mm and the width 22 mm, yet C is 42.5 kN Reading the NKS prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened X-life status (-XL) indicates the current Schaeffler premium execution at 40 mm bore; the 54 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 55 mm outside diameter and 42.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 40 mm seat, and in hydraulic and pneumatic pump eccentrics the 129 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 22 mm width and the published 54 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKS40-XL?", "a": "The NKS40-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 55 mm outside diameter, 40 mm bore and 22 mm width, envelope 40×55×22 mm. Mass is 129 g." }, { "q": "What does the NKS40-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS40-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×55×22 mm and the catalogue ratings are C 42.5 kN, C0 54 kN, Cur 9.4 kN." }, { "q": "What is the load capacity of the NKS40-XL?", "a": "The basic dynamic load rating C is 42.5 kN and the basic static load rating C0 is 54 kN; the fatigue load limit Cur is 9.4 kN." }, { "q": "What is the maximum speed of the NKS40-XL?", "a": "The limiting speed is 10,900 r/min and the thermal reference speed is 6,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS40-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS40-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS40", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×55×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS40-XL", "NKS40-XL" ], "locale_variants": {} }, { "sku": "NK42-20-XL", "brand": "FAG", "manufacturer_designation": "NK42/20-XL", "series": "nk-series", "type": "needle", "d_mm": 42, "D_mm": 52, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30, "static_load_kN": 49, "fatigue_load_limit_kN": 8.8, "limiting_speed_rpm": 10900, "max_rpm": 10900, "reference_speed_rpm": 6600, "weight_g": 85.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×52×20 mm: 42 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 30 kN and C0 49 kN at the 42 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 8.8 kN, the limiting speed 10,900 r/min and the thermal reference speed 6,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.71 kN/mm and per millimetre of width 1.50 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 85.8 g, just 0.08 g per mm² of projected 52×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 42 mm bore marks the medium range: mounting forces and fits become critical, and the 85.8 g mass calls for proper induction or press tooling rather than hand fitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The hardness requirement is unforgiving: below about 58 HRC the 42 mm journal brinels under the 49 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 8.8 kN Cur value. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 52 mm outside diameter and 30 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 42 mm seat, and in motorcycle and light-vehicle transmissions the 85.8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 20 mm width and the published 49 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK42/20-XL?", "a": "The NK42/20-XL is a NK machined-ring needle roller bearing without inner ring with 52 mm outside diameter, 42 mm bore and 20 mm width, envelope 42×52×20 mm. Mass is 85.8 g." }, { "q": "What does the NK42/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK42/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 42×52×20 mm and the catalogue ratings are C 30 kN, C0 49 kN, Cur 8.8 kN." }, { "q": "What is the load capacity of the NK42/20-XL?", "a": "The basic dynamic load rating C is 30 kN and the basic static load rating C0 is 49 kN; the fatigue load limit Cur is 8.8 kN." }, { "q": "What is the maximum speed of the NK42/20-XL?", "a": "The limiting speed is 10,900 r/min and the thermal reference speed is 6,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK42/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK42/20-XL has no inner ring, so the 42 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK42-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 42×52×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK42-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK42-20-XL", "NK42/20-XL" ], "locale_variants": {} }, { "sku": "NK42-30-XL", "brand": "FAG", "manufacturer_designation": "NK42/30-XL", "series": "nk-series", "type": "needle", "d_mm": 42, "D_mm": 52, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44.5, "static_load_kN": 82, "fatigue_load_limit_kN": 15.5, "limiting_speed_rpm": 10900, "max_rpm": 10900, "reference_speed_rpm": 6400, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×52×30 mm: 42 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 44.5 kN and C0 82 kN at the 42 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 15.5 kN, the limiting speed 10,900 r/min and the thermal reference speed 6,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.06 kN/mm and per millimetre of width 1.48 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 130 g, just 0.08 g per mm² of projected 52×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 42 mm bore marks the medium range: mounting forces and fits become critical, and the 130 g mass calls for proper induction or press tooling rather than hand fitting The hardness requirement is unforgiving: below about 58 HRC the 42 mm journal brinels under the 82 kN static rating, and roughness above raceway finish accelerates roller wear Omitting the inner ring frees radial space — at a 42 mm shaft the outer diameter is only 52 mm and the width 30 mm, yet C is 44.5 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 44.5 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 52 mm outside diameter and 44.5 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 42 mm seat, and in gearbox selector and change linkages the 130 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 82 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK42/30-XL?", "a": "The NK42/30-XL is a NK machined-ring needle roller bearing without inner ring with 52 mm outside diameter, 42 mm bore and 30 mm width, envelope 42×52×30 mm. Mass is 130 g." }, { "q": "What does the NK42/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK42/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 42×52×30 mm and the catalogue ratings are C 44.5 kN, C0 82 kN, Cur 15.5 kN." }, { "q": "What is the load capacity of the NK42/30-XL?", "a": "The basic dynamic load rating C is 44.5 kN and the basic static load rating C0 is 82 kN; the fatigue load limit Cur is 15.5 kN." }, { "q": "What is the maximum speed of the NK42/30-XL?", "a": "The limiting speed is 10,900 r/min and the thermal reference speed is 6,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK42/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK42/30-XL has no inner ring, so the 42 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK42-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK42-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 42×52×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK42-30-XL", "NK42/30-XL" ], "locale_variants": {} }, { "sku": "RNA4907-XL", "brand": "FAG", "manufacturer_designation": "RNA4907-XL", "series": "rna49-series", "type": "needle", "d_mm": 42, "D_mm": 55, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35.5, "static_load_kN": 50, "fatigue_load_limit_kN": 9.6, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 6100, "weight_g": 107, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×55×20 mm: 42 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 35.5 kN and C0 50 kN at the 42 mm seat; the C/C0 ratio of 0.71 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 9.6 kN, the limiting speed 10,700 r/min and the thermal reference speed 6,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.85 kN/mm and per millimetre of width 1.77 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 107 g, just 0.10 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 42 mm bore places this bearing in the medium band, where the 55 mm envelope already carries ratings in the tens of kilonewtons The thin 6.5 mm section makes the 107 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 42×55×20 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 55 mm outside diameter and 35.5 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 42 mm seat, and in copying and printing machine mechanisms the 107 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 50 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4907-XL?", "a": "The RNA4907-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 55 mm outside diameter, 42 mm bore and 20 mm width, envelope 42×55×20 mm. Mass is 107 g." }, { "q": "What does the RNA4907-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4907-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 42×55×20 mm and the catalogue ratings are C 35.5 kN, C0 50 kN, Cur 9.6 kN." }, { "q": "What is the load capacity of the RNA4907-XL?", "a": "The basic dynamic load rating C is 35.5 kN and the basic static load rating C0 is 50 kN; the fatigue load limit Cur is 9.6 kN." }, { "q": "What is the maximum speed of the RNA4907-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 6,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4907-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4907-XL has no inner ring, so the 42 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4907", "equiv_brand": "SKF", "level": "partial", "note": "Same 42×55×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4907-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 42×55×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4907-XL", "RNA4907-XL" ], "locale_variants": {} }, { "sku": "RNA6907-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6907-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 42, "D_mm": 55, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 54, "static_load_kN": 86, "fatigue_load_limit_kN": 16.2, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 6200, "weight_g": 193, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×55×36 mm: 42 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 54 kN and C0 86 kN at the 42 mm seat; the C/C0 ratio of 0.63 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 16.2 kN, the limiting speed 10,700 r/min and the thermal reference speed 6,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.29 kN/mm and per millimetre of width 1.50 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 193 g, just 0.10 g per mm² of projected 55×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 42 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 36 mm width as a standard mounting space Omitting the inner ring frees radial space — at a 42 mm shaft the outer diameter is only 55 mm and the width 36 mm, yet C is 54 kN Reading the RNA69 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 16.2 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 55 mm outside diameter and 54 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 42 mm seat, and in copying and printing machine mechanisms the 193 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 36 mm width and the published 86 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNA6907-ZW-XL?", "a": "The RNA6907-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 55 mm outside diameter, 42 mm bore and 36 mm width, envelope 42×55×36 mm. Mass is 193 g." }, { "q": "What does the RNA6907-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6907-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 42×55×36 mm and the catalogue ratings are C 54 kN, C0 86 kN, Cur 16.2 kN." }, { "q": "What is the load capacity of the RNA6907-ZW-XL?", "a": "The basic dynamic load rating C is 54 kN and the basic static load rating C0 is 86 kN; the fatigue load limit Cur is 16.2 kN." }, { "q": "What is the maximum speed of the RNA6907-ZW-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 6,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6907-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6907-ZW-XL has no inner ring, so the 42 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6907", "equiv_brand": "SKF", "level": "partial", "note": "Same 42×55×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=951", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6907-ZW-XL", "RNA6907-ZW-XL" ], "locale_variants": {} }, { "sku": "NK43-20-XL", "brand": "FAG", "manufacturer_designation": "NK43/20-XL", "series": "nk-series", "type": "needle", "d_mm": 43, "D_mm": 53, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30.5, "static_load_kN": 51, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 6500, "weight_g": 86, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 43×53×20 mm: 43 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 30.5 kN and C0 51 kN at the 43 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 53 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 10,700 r/min and the thermal reference speed 6,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.71 kN/mm and per millimetre of width 1.52 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 86 g, just 0.08 g per mm² of projected 53×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 43 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 9.1 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 53 mm outside diameter and 30.5 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 43 mm seat, and in textile machine heald and cam shafts the 86 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 51 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK43/20-XL?", "a": "The NK43/20-XL is a NK machined-ring needle roller bearing without inner ring with 53 mm outside diameter, 43 mm bore and 20 mm width, envelope 43×53×20 mm. Mass is 86 g." }, { "q": "What does the NK43/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK43/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 43×53×20 mm and the catalogue ratings are C 30.5 kN, C0 51 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the NK43/20-XL?", "a": "The basic dynamic load rating C is 30.5 kN and the basic static load rating C0 is 51 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the NK43/20-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 6,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK43/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK43/20-XL has no inner ring, so the 43 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK43-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 43×53×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK43-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK43-20-XL", "NK43/20-XL" ], "locale_variants": {} }, { "sku": "NK43-30-XL", "brand": "FAG", "manufacturer_designation": "NK43/30-XL", "series": "nk-series", "type": "needle", "d_mm": 43, "D_mm": 53, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 85, "fatigue_load_limit_kN": 16.1, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 6300, "weight_g": 133, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 43×53×30 mm: 43 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 45.5 kN and C0 85 kN at the 43 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 53 mm outside diameter the fatigue load limit Cur is 16.1 kN, the limiting speed 10,700 r/min and the thermal reference speed 6,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.06 kN/mm and per millimetre of width 1.52 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 133 g, just 0.08 g per mm² of projected 53×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 43 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 30 mm width as a standard mounting space The thin 5.0 mm section makes the 133 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Omitting the inner ring frees radial space — at a 43 mm shaft the outer diameter is only 53 mm and the width 30 mm, yet C is 45.5 kN As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 16.1 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 53 mm outside diameter and 45.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 43 mm seat, and in connecting-rod small ends the 133 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 85 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK43/30-XL?", "a": "The NK43/30-XL is a NK machined-ring needle roller bearing without inner ring with 53 mm outside diameter, 43 mm bore and 30 mm width, envelope 43×53×30 mm. Mass is 133 g." }, { "q": "What does the NK43/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK43/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 43×53×30 mm and the catalogue ratings are C 45.5 kN, C0 85 kN, Cur 16.1 kN." }, { "q": "What is the load capacity of the NK43/30-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 85 kN; the fatigue load limit Cur is 16.1 kN." }, { "q": "What is the maximum speed of the NK43/30-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 6,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK43/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK43/30-XL has no inner ring, so the 43 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK43-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK43-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 43×53×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK43-30-XL", "NK43/30-XL" ], "locale_variants": {} }, { "sku": "NKS43-XL", "brand": "FAG", "manufacturer_designation": "NKS43-XL", "series": "nks-series", "type": "needle", "d_mm": 43, "D_mm": 58, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44, "static_load_kN": 57, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 10200, "max_rpm": 10200, "reference_speed_rpm": 6200, "weight_g": 139, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 43×58×22 mm: 43 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 44 kN and C0 57 kN at the 43 mm seat; the C/C0 ratio of 0.77 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 58 mm outside diameter the fatigue load limit Cur is 10 kN, the limiting speed 10,200 r/min and the thermal reference speed 6,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.02 kN/mm and per millimetre of width 2.00 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 139 g, just 0.11 g per mm² of projected 58×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 43 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space Omitting the inner ring frees radial space — at a 43 mm shaft the outer diameter is only 58 mm and the width 22 mm, yet C is 44 kN NKS43-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 10 kN Cur value. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 58 mm outside diameter and 44 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 43 mm seat, and in agricultural machine pivots and linkages the 139 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 22 mm width and the published 57 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKS43-XL?", "a": "The NKS43-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 58 mm outside diameter, 43 mm bore and 22 mm width, envelope 43×58×22 mm. Mass is 139 g." }, { "q": "What does the NKS43-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS43-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 43×58×22 mm and the catalogue ratings are C 44 kN, C0 57 kN, Cur 10 kN." }, { "q": "What is the load capacity of the NKS43-XL?", "a": "The basic dynamic load rating C is 44 kN and the basic static load rating C0 is 57 kN; the fatigue load limit Cur is 10 kN." }, { "q": "What is the maximum speed of the NKS43-XL?", "a": "The limiting speed is 10,200 r/min and the thermal reference speed is 6,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS43-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS43-XL has no inner ring, so the 43 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS43", "equiv_brand": "SKF", "level": "partial", "note": "Same 43×58×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS43-XL", "NKS43-XL" ], "locale_variants": {} }, { "sku": "NK45-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NK45/20-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 45, "D_mm": 55, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 35, "static_load_kN": 62, "fatigue_load_limit_kN": 11, "limiting_speed_rpm": 10200, "max_rpm": 10200, "reference_speed_rpm": 5900, "weight_g": 85.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×55×20 mm: 45 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 35 kN and C0 62 kN at the 45 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 11 kN, the limiting speed 10,200 r/min and the thermal reference speed 5,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.78 kN/mm and per millimetre of width 1.75 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 85.3 g, just 0.08 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 45 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space The hardness requirement is unforgiving: below about 58 HRC the 45 mm journal brinels under the 62 kN static rating, and roughness above raceway finish accelerates roller wear With Cur 11 kN and a 10,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins X-life status (-XL) indicates the current Schaeffler premium execution at 45 mm bore; the 62 kN C0 rating reflects the improved rolling-contact geometry. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 55 mm outside diameter and 35 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 45 mm seat, and in copying and printing machine mechanisms the 85.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 62 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK45/20-TV-XL?", "a": "The NK45/20-TV-XL is a NK machined-ring needle roller bearing without inner ring with 55 mm outside diameter, 45 mm bore and 20 mm width, envelope 45×55×20 mm. Mass is 85.3 g." }, { "q": "What does the NK45/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK45/20-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×55×20 mm and the catalogue ratings are C 35 kN, C0 62 kN, Cur 11 kN." }, { "q": "What is the load capacity of the NK45/20-TV-XL?", "a": "The basic dynamic load rating C is 35 kN and the basic static load rating C0 is 62 kN; the fatigue load limit Cur is 11 kN." }, { "q": "What is the maximum speed of the NK45/20-TV-XL?", "a": "The limiting speed is 10,200 r/min and the thermal reference speed is 5,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK45/20-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK45/20-TV-XL has no inner ring, so the 45 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK45-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×55×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK45-30-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK45-20-TV-XL", "NK45/20-TV-XL" ], "locale_variants": {} }, { "sku": "NK45-30-TV-XL", "brand": "FAG", "manufacturer_designation": "NK45/30-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 45, "D_mm": 55, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 52, "static_load_kN": 103, "fatigue_load_limit_kN": 19.5, "limiting_speed_rpm": 10200, "max_rpm": 10200, "reference_speed_rpm": 5700, "weight_g": 132, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×55×30 mm: 45 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 52 kN and C0 103 kN at the 45 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 19.5 kN, the limiting speed 10,200 r/min and the thermal reference speed 5,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.16 kN/mm and per millimetre of width 1.73 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 132 g, just 0.08 g per mm² of projected 55×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 45 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 30 mm width as a standard mounting space NK45/30-TV-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality With Cur 19.5 kN and a 10,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 19.5 kN Cur value. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 132 g in the 55 mm envelope. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 55 mm outside diameter and 52 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 45 mm seat, and in textile machine heald and cam shafts the 132 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 103 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK45/30-TV-XL?", "a": "The NK45/30-TV-XL is a NK machined-ring needle roller bearing without inner ring with 55 mm outside diameter, 45 mm bore and 30 mm width, envelope 45×55×30 mm. Mass is 132 g." }, { "q": "What does the NK45/30-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK45/30-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×55×30 mm and the catalogue ratings are C 52 kN, C0 103 kN, Cur 19.5 kN." }, { "q": "What is the load capacity of the NK45/30-TV-XL?", "a": "The basic dynamic load rating C is 52 kN and the basic static load rating C0 is 103 kN; the fatigue load limit Cur is 19.5 kN." }, { "q": "What is the maximum speed of the NK45/30-TV-XL?", "a": "The limiting speed is 10,200 r/min and the thermal reference speed is 5,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK45/30-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK45/30-TV-XL has no inner ring, so the 45 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK45-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK45-30-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×55×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK45-30-TV-XL", "NK45/30-TV-XL" ], "locale_variants": {} }, { "sku": "NKS45-XL", "brand": "FAG", "manufacturer_designation": "NKS45-XL", "series": "nks-series", "type": "needle", "d_mm": 45, "D_mm": 60, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 60, "fatigue_load_limit_kN": 10.6, "limiting_speed_rpm": 9800, "max_rpm": 9800, "reference_speed_rpm": 6000, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×60×22 mm: 45 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 45.5 kN and C0 60 kN at the 45 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 60 mm outside diameter the fatigue load limit Cur is 10.6 kN, the limiting speed 9,800 r/min and the thermal reference speed 6,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 2.07 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 145 g, just 0.11 g per mm² of projected 60×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 45 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space Reading the NKS prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 45.5 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 60 mm outside diameter and 45.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 45 mm seat, and in hydraulic and pneumatic pump eccentrics the 145 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 22 mm width and the published 60 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKS45-XL?", "a": "The NKS45-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 60 mm outside diameter, 45 mm bore and 22 mm width, envelope 45×60×22 mm. Mass is 145 g." }, { "q": "What does the NKS45-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS45-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×60×22 mm and the catalogue ratings are C 45.5 kN, C0 60 kN, Cur 10.6 kN." }, { "q": "What is the load capacity of the NKS45-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 60 kN; the fatigue load limit Cur is 10.6 kN." }, { "q": "What is the maximum speed of the NKS45-XL?", "a": "The limiting speed is 9,800 r/min and the thermal reference speed is 6,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS45-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS45-XL has no inner ring, so the 45 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS45", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×60×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS45-XL", "NKS45-XL" ], "locale_variants": {} }, { "sku": "NK47-20-XL", "brand": "FAG", "manufacturer_designation": "NK47/20-XL", "series": "nk-series", "type": "needle", "d_mm": 47, "D_mm": 57, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32.5, "static_load_kN": 56, "fatigue_load_limit_kN": 10.1, "limiting_speed_rpm": 9800, "max_rpm": 9800, "reference_speed_rpm": 6000, "weight_g": 94.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 47×57×20 mm: 47 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 32.5 kN and C0 56 kN at the 47 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 57 mm outside diameter the fatigue load limit Cur is 10.1 kN, the limiting speed 9,800 r/min and the thermal reference speed 6,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.69 kN/mm and per millimetre of width 1.63 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 94.5 g, just 0.08 g per mm² of projected 57×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 47 mm bore marks the medium range: mounting forces and fits become critical, and the 94.5 g mass calls for proper induction or press tooling rather than hand fitting Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The hardness requirement is unforgiving: below about 58 HRC the 47 mm journal brinels under the 56 kN static rating, and roughness above raceway finish accelerates roller wear X-life status (-XL) indicates the current Schaeffler premium execution at 47 mm bore; the 56 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 57 mm outside diameter and 32.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 47 mm seat, and in connecting-rod small ends the 94.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 20 mm width and the published 56 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK47/20-XL?", "a": "The NK47/20-XL is a NK machined-ring needle roller bearing without inner ring with 57 mm outside diameter, 47 mm bore and 20 mm width, envelope 47×57×20 mm. Mass is 94.5 g." }, { "q": "What does the NK47/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK47/20-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 47×57×20 mm and the catalogue ratings are C 32.5 kN, C0 56 kN, Cur 10.1 kN." }, { "q": "What is the load capacity of the NK47/20-XL?", "a": "The basic dynamic load rating C is 32.5 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 10.1 kN." }, { "q": "What is the maximum speed of the NK47/20-XL?", "a": "The limiting speed is 9,800 r/min and the thermal reference speed is 6,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK47/20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK47/20-XL has no inner ring, so the 47 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK47-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 47×57×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK47-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK47-20-XL", "NK47/20-XL" ], "locale_variants": {} }, { "sku": "NK47-30-XL", "brand": "FAG", "manufacturer_designation": "NK47/30-XL", "series": "nk-series", "type": "needle", "d_mm": 47, "D_mm": 57, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 94, "fatigue_load_limit_kN": 17.8, "limiting_speed_rpm": 9800, "max_rpm": 9800, "reference_speed_rpm": 5800, "weight_g": 142, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 47×57×30 mm: 47 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 48.5 kN and C0 94 kN at the 47 mm seat; the C/C0 ratio of 0.52 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 57 mm outside diameter the fatigue load limit Cur is 17.8 kN, the limiting speed 9,800 r/min and the thermal reference speed 5,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 1.62 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 142 g, just 0.08 g per mm² of projected 57×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 47 mm bore marks the medium range: mounting forces and fits become critical, and the 142 g mass calls for proper induction or press tooling rather than hand fitting With Cur 17.8 kN and a 9,800 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The thin 5.0 mm section makes the 142 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting X-life status (-XL) indicates the current Schaeffler premium execution at 47 mm bore; the 94 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 57 mm outside diameter and 48.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 47 mm seat, and in motorcycle and light-vehicle transmissions the 142 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 30 mm width and the published 94 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK47/30-XL?", "a": "The NK47/30-XL is a NK machined-ring needle roller bearing without inner ring with 57 mm outside diameter, 47 mm bore and 30 mm width, envelope 47×57×30 mm. Mass is 142 g." }, { "q": "What does the NK47/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK47/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 47×57×30 mm and the catalogue ratings are C 48.5 kN, C0 94 kN, Cur 17.8 kN." }, { "q": "What is the load capacity of the NK47/30-XL?", "a": "The basic dynamic load rating C is 48.5 kN and the basic static load rating C0 is 94 kN; the fatigue load limit Cur is 17.8 kN." }, { "q": "What is the maximum speed of the NK47/30-XL?", "a": "The limiting speed is 9,800 r/min and the thermal reference speed is 5,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK47/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK47/30-XL has no inner ring, so the 47 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK47-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK47-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 47×57×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK47-30-XL", "NK47/30-XL" ], "locale_variants": {} }, { "sku": "RNA4908-XL", "brand": "FAG", "manufacturer_designation": "RNA4908-XL", "series": "rna49-series", "type": "needle", "d_mm": 48, "D_mm": 62, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 67, "fatigue_load_limit_kN": 11.7, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 5300, "weight_g": 140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 48×62×22 mm: 48 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 48.5 kN and C0 67 kN at the 48 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 11.7 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 2.20 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 140 g, just 0.10 g per mm² of projected 62×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 48 mm bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 48×62×22 mm envelope. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 62 mm outside diameter and 48.5 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 48 mm seat, and in textile machine heald and cam shafts the 140 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 22 mm width and the published 67 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA4908-XL?", "a": "The RNA4908-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 62 mm outside diameter, 48 mm bore and 22 mm width, envelope 48×62×22 mm. Mass is 140 g." }, { "q": "What does the RNA4908-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4908-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 48×62×22 mm and the catalogue ratings are C 48.5 kN, C0 67 kN, Cur 11.7 kN." }, { "q": "What is the load capacity of the RNA4908-XL?", "a": "The basic dynamic load rating C is 48.5 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 11.7 kN." }, { "q": "What is the maximum speed of the RNA4908-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 5,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4908-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4908-XL has no inner ring, so the 48 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4908", "equiv_brand": "SKF", "level": "partial", "note": "Same 48×62×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4908-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 48×62×22 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4908-XL", "RNA4908-XL" ], "locale_variants": {} }, { "sku": "RNA6908-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6908-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 48, "D_mm": 62, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 74, "static_load_kN": 116, "fatigue_load_limit_kN": 19.8, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 5400, "weight_g": 256, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 48×62×40 mm: 48 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 74 kN and C0 116 kN at the 48 mm seat; the C/C0 ratio of 0.64 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 19.8 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.54 kN/mm and per millimetre of width 1.85 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 256 g, just 0.10 g per mm² of projected 62×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 48 mm bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons Omitting the inner ring frees radial space — at a 48 mm shaft the outer diameter is only 62 mm and the width 40 mm, yet C is 74 kN With Cur 19.8 kN and a 9,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 19.8 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 62 mm outside diameter and 74 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 48 mm seat, and in planetary gear bearings the 256 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 40 mm width and the published 116 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA6908-ZW-XL?", "a": "The RNA6908-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 62 mm outside diameter, 48 mm bore and 40 mm width, envelope 48×62×40 mm. Mass is 256 g." }, { "q": "What does the RNA6908-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6908-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 48×62×40 mm and the catalogue ratings are C 74 kN, C0 116 kN, Cur 19.8 kN." }, { "q": "What is the load capacity of the RNA6908-ZW-XL?", "a": "The basic dynamic load rating C is 74 kN and the basic static load rating C0 is 116 kN; the fatigue load limit Cur is 19.8 kN." }, { "q": "What is the maximum speed of the RNA6908-ZW-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 5,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6908-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6908-ZW-XL has no inner ring, so the 48 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6908", "equiv_brand": "SKF", "level": "partial", "note": "Same 48×62×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6908-ZW-XL", "RNA6908-ZW-XL" ], "locale_variants": {} }, { "sku": "NK50-25-TV-XL", "brand": "FAG", "manufacturer_designation": "NK50/25-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 50, "D_mm": 62, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 48.5, "static_load_kN": 87, "fatigue_load_limit_kN": 15, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 5400, "weight_g": 146, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×62×25 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 48.5 kN and C0 87 kN at the 50 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 15 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.97 kN/mm and per millimetre of width 1.94 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 146 g, just 0.09 g per mm² of projected 62×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 50 mm bore marks the medium range: mounting forces and fits become critical, and the 146 g mass calls for proper induction or press tooling rather than hand fitting The thin 6.0 mm section makes the 146 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 15 kN Cur value. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 9,200 r/min. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 62 mm outside diameter and 48.5 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 50 mm seat, and in textile machine heald and cam shafts the 146 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 25 mm width and the published 87 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK50/25-TV-XL?", "a": "The NK50/25-TV-XL is a NK machined-ring needle roller bearing without inner ring with 62 mm outside diameter, 50 mm bore and 25 mm width, envelope 50×62×25 mm. Mass is 146 g." }, { "q": "What does the NK50/25-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK50/25-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×62×25 mm and the catalogue ratings are C 48.5 kN, C0 87 kN, Cur 15 kN." }, { "q": "What is the load capacity of the NK50/25-TV-XL?", "a": "The basic dynamic load rating C is 48.5 kN and the basic static load rating C0 is 87 kN; the fatigue load limit Cur is 15 kN." }, { "q": "What is the maximum speed of the NK50/25-TV-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 5,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK50/25-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK50/25-TV-XL has no inner ring, so the 50 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK50-25-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×62×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK50-35-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK50-25-TV-XL", "NK50/25-TV-XL" ], "locale_variants": {} }, { "sku": "NK50-35-TV-XL", "brand": "FAG", "manufacturer_designation": "NK50/35-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 50, "D_mm": 62, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 67, "static_load_kN": 132, "fatigue_load_limit_kN": 24.3, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 5200, "weight_g": 207, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×62×35 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 67 kN and C0 132 kN at the 50 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 24.3 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.34 kN/mm and per millimetre of width 1.91 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 207 g, just 0.10 g per mm² of projected 62×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 50 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 35 mm width as a standard mounting space This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 24.3 kN and a 9,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 67 kN C rating and longer nominal life come without an envelope change. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 9,200 r/min. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 62 mm outside diameter and 67 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 50 mm seat, and in motorcycle and light-vehicle transmissions the 207 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 35 mm width and the published 132 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK50/35-TV-XL?", "a": "The NK50/35-TV-XL is a NK machined-ring needle roller bearing without inner ring with 62 mm outside diameter, 50 mm bore and 35 mm width, envelope 50×62×35 mm. Mass is 207 g." }, { "q": "What does the NK50/35-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK50/35-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×62×35 mm and the catalogue ratings are C 67 kN, C0 132 kN, Cur 24.3 kN." }, { "q": "What is the load capacity of the NK50/35-TV-XL?", "a": "The basic dynamic load rating C is 67 kN and the basic static load rating C0 is 132 kN; the fatigue load limit Cur is 24.3 kN." }, { "q": "What is the maximum speed of the NK50/35-TV-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 5,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK50/35-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK50/35-TV-XL has no inner ring, so the 50 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK50-25-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK50-35-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×62×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK50-35-TV-XL", "NK50/35-TV-XL" ], "locale_variants": {} }, { "sku": "NKS50-XL", "brand": "FAG", "manufacturer_designation": "NKS50-XL", "series": "nks-series", "type": "needle", "d_mm": 50, "D_mm": 65, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48, "static_load_kN": 67, "fatigue_load_limit_kN": 11.8, "limiting_speed_rpm": 8900, "max_rpm": 8900, "reference_speed_rpm": 5500, "weight_g": 157, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×65×22 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 48 kN and C0 67 kN at the 50 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 65 mm outside diameter the fatigue load limit Cur is 11.8 kN, the limiting speed 8,900 r/min and the thermal reference speed 5,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 2.18 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 157 g, just 0.11 g per mm² of projected 65×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 50 mm bore marks the medium range: mounting forces and fits become critical, and the 157 g mass calls for proper induction or press tooling rather than hand fitting NKS50-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11.8 kN Cur value. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 65 mm outside diameter and 48 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 50 mm seat, and in two-stroke and compressor piston pins the 157 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 22 mm width and the published 67 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKS50-XL?", "a": "The NKS50-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 65 mm outside diameter, 50 mm bore and 22 mm width, envelope 50×65×22 mm. Mass is 157 g." }, { "q": "What does the NKS50-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS50-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×65×22 mm and the catalogue ratings are C 48 kN, C0 67 kN, Cur 11.8 kN." }, { "q": "What is the load capacity of the NKS50-XL?", "a": "The basic dynamic load rating C is 48 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 11.8 kN." }, { "q": "What is the maximum speed of the NKS50-XL?", "a": "The limiting speed is 8,900 r/min and the thermal reference speed is 5,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS50-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS50-XL has no inner ring, so the 50 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS50", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×65×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS50-XL", "NKS50-XL" ], "locale_variants": {} }, { "sku": "RNA4909-XL", "brand": "FAG", "manufacturer_designation": "RNA4909-XL", "series": "rna49-series", "type": "needle", "d_mm": 52, "D_mm": 68, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 73, "fatigue_load_limit_kN": 12.9, "limiting_speed_rpm": 8600, "max_rpm": 8600, "reference_speed_rpm": 4900, "weight_g": 182, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 52×68×22 mm: 52 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.0 mm radial section packed with small-diameter needle rollers C is 51 kN and C0 73 kN at the 52 mm seat; the C/C0 ratio of 0.70 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 12.9 kN, the limiting speed 8,600 r/min and the thermal reference speed 4,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.98 kN/mm and per millimetre of width 2.32 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 182 g, just 0.12 g per mm² of projected 68×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 52 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons The hardness requirement is unforgiving: below about 58 HRC the 52 mm journal brinels under the 73 kN static rating, and roughness above raceway finish accelerates roller wear This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 8,600 r/min limit. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 68 mm outside diameter and 51 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 52 mm seat, and in gearbox selector and change linkages the 182 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 22 mm width and the published 73 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4909-XL?", "a": "The RNA4909-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 68 mm outside diameter, 52 mm bore and 22 mm width, envelope 52×68×22 mm. Mass is 182 g." }, { "q": "What does the RNA4909-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4909-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 52×68×22 mm and the catalogue ratings are C 51 kN, C0 73 kN, Cur 12.9 kN." }, { "q": "What is the load capacity of the RNA4909-XL?", "a": "The basic dynamic load rating C is 51 kN and the basic static load rating C0 is 73 kN; the fatigue load limit Cur is 12.9 kN." }, { "q": "What is the maximum speed of the RNA4909-XL?", "a": "The limiting speed is 8,600 r/min and the thermal reference speed is 4,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4909-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4909-XL has no inner ring, so the 52 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4909", "equiv_brand": "SKF", "level": "partial", "note": "Same 52×68×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4909-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 52×68×22 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4909-XL", "RNA4909-XL" ], "locale_variants": {} }, { "sku": "RNA6909-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6909-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 52, "D_mm": 68, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 79, "static_load_kN": 127, "fatigue_load_limit_kN": 21.8, "limiting_speed_rpm": 8600, "max_rpm": 8600, "reference_speed_rpm": 4950, "weight_g": 338, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 52×68×40 mm: 52 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.0 mm radial section packed with small-diameter needle rollers C is 79 kN and C0 127 kN at the 52 mm seat; the C/C0 ratio of 0.62 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 21.8 kN, the limiting speed 8,600 r/min and the thermal reference speed 4,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.52 kN/mm and per millimetre of width 1.98 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 338 g, just 0.12 g per mm² of projected 68×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 52 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons The hardness requirement is unforgiving: below about 58 HRC the 52 mm journal brinels under the 127 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 21.8 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 68 mm outside diameter and 79 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 52 mm seat, and in small electric motor accessory drives the 338 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 40 mm width and the published 127 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA6909-ZW-XL?", "a": "The RNA6909-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 68 mm outside diameter, 52 mm bore and 40 mm width, envelope 52×68×40 mm. Mass is 338 g." }, { "q": "What does the RNA6909-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6909-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 52×68×40 mm and the catalogue ratings are C 79 kN, C0 127 kN, Cur 21.8 kN." }, { "q": "What is the load capacity of the RNA6909-ZW-XL?", "a": "The basic dynamic load rating C is 79 kN and the basic static load rating C0 is 127 kN; the fatigue load limit Cur is 21.8 kN." }, { "q": "What is the maximum speed of the RNA6909-ZW-XL?", "a": "The limiting speed is 8,600 r/min and the thermal reference speed is 4,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6909-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6909-ZW-XL has no inner ring, so the 52 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6909", "equiv_brand": "SKF", "level": "partial", "note": "Same 52×68×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6909-ZW-XL", "RNA6909-ZW-XL" ], "locale_variants": {} }, { "sku": "NK55-25-D-XL", "brand": "FAG", "manufacturer_designation": "NK55/25-D-XL", "series": "nk-series", "type": "needle", "d_mm": 55, "D_mm": 68, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 57, "static_load_kN": 111, "fatigue_load_limit_kN": 19.7, "limiting_speed_rpm": 8400, "max_rpm": 8400, "reference_speed_rpm": 4700, "weight_g": 195, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×68×25 mm: 55 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 57 kN and C0 111 kN at the 55 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 19.7 kN, the limiting speed 8,400 r/min and the thermal reference speed 4,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.04 kN/mm and per millimetre of width 2.28 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 195 g, just 0.11 g per mm² of projected 68×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 55 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 25 mm width as a standard mounting space NK55/25-D-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces X-life status (-XL) indicates the current Schaeffler premium execution at 55 mm bore; the 111 kN C0 rating reflects the improved rolling-contact geometry. The -D suffix supplies a radially split needle roller and cage assembly, so the cage can be fitted at bearing positions that cannot be reached over a shaft end. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 68 mm outside diameter and 57 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 55 mm seat, and in rocker arms and valve trains the 195 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 25 mm width and the published 111 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK55/25-D-XL?", "a": "The NK55/25-D-XL is a NK machined-ring needle roller bearing without inner ring with 68 mm outside diameter, 55 mm bore and 25 mm width, envelope 55×68×25 mm. Mass is 195 g." }, { "q": "What does the NK55/25-D-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK55/25-D-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×68×25 mm and the catalogue ratings are C 57 kN, C0 111 kN, Cur 19.7 kN." }, { "q": "What is the load capacity of the NK55/25-D-XL?", "a": "The basic dynamic load rating C is 57 kN and the basic static load rating C0 is 111 kN; the fatigue load limit Cur is 19.7 kN." }, { "q": "What is the maximum speed of the NK55/25-D-XL?", "a": "The limiting speed is 8,400 r/min and the thermal reference speed is 4,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK55/25-D-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK55/25-D-XL has no inner ring, so the 55 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK55-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×68×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK55-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK55-25-D-XL", "NK55/25-D-XL" ], "locale_variants": {} }, { "sku": "NK55-25-XL", "brand": "FAG", "manufacturer_designation": "NK55/25-XL", "series": "nk-series", "type": "needle", "d_mm": 55, "D_mm": 68, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 82, "fatigue_load_limit_kN": 14.3, "limiting_speed_rpm": 8400, "max_rpm": 8400, "reference_speed_rpm": 5200, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×68×25 mm: 55 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 45.5 kN and C0 82 kN at the 55 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 14.3 kN, the limiting speed 8,400 r/min and the thermal reference speed 5,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.83 kN/mm and per millimetre of width 1.82 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 180 g, just 0.11 g per mm² of projected 68×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 55 mm bore marks the medium range: mounting forces and fits become critical, and the 180 g mass calls for proper induction or press tooling rather than hand fitting The hardness requirement is unforgiving: below about 58 HRC the 55 mm journal brinels under the 82 kN static rating, and roughness above raceway finish accelerates roller wear Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 55×68×25 mm envelope. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 68 mm outside diameter and 45.5 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 55 mm seat, and in gearbox selector and change linkages the 180 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 25 mm width and the published 82 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK55/25-XL?", "a": "The NK55/25-XL is a NK machined-ring needle roller bearing without inner ring with 68 mm outside diameter, 55 mm bore and 25 mm width, envelope 55×68×25 mm. Mass is 180 g." }, { "q": "What does the NK55/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK55/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×68×25 mm and the catalogue ratings are C 45.5 kN, C0 82 kN, Cur 14.3 kN." }, { "q": "What is the load capacity of the NK55/25-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 82 kN; the fatigue load limit Cur is 14.3 kN." }, { "q": "What is the maximum speed of the NK55/25-XL?", "a": "The limiting speed is 8,400 r/min and the thermal reference speed is 5,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK55/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK55/25-XL has no inner ring, so the 55 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK55-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×68×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK55-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK55-25-XL", "NK55/25-XL" ], "locale_variants": {} }, { "sku": "NK55-35-XL", "brand": "FAG", "manufacturer_designation": "NK55/35-XL", "series": "nk-series", "type": "needle", "d_mm": 55, "D_mm": 68, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 60, "static_load_kN": 118, "fatigue_load_limit_kN": 21.6, "limiting_speed_rpm": 8400, "max_rpm": 8400, "reference_speed_rpm": 5200, "weight_g": 250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×68×35 mm: 55 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 60 kN and C0 118 kN at the 55 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 21.6 kN, the limiting speed 8,400 r/min and the thermal reference speed 5,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.09 kN/mm and per millimetre of width 1.71 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 250 g, just 0.11 g per mm² of projected 68×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 55 mm bore marks the medium range: mounting forces and fits become critical, and the 250 g mass calls for proper induction or press tooling rather than hand fitting Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened Omitting the inner ring frees radial space — at a 55 mm shaft the outer diameter is only 68 mm and the width 35 mm, yet C is 60 kN The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 55×68×35 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 68 mm outside diameter and 60 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 55 mm seat, and in copying and printing machine mechanisms the 250 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 35 mm width and the published 118 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK55/35-XL?", "a": "The NK55/35-XL is a NK machined-ring needle roller bearing without inner ring with 68 mm outside diameter, 55 mm bore and 35 mm width, envelope 55×68×35 mm. Mass is 250 g." }, { "q": "What does the NK55/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK55/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×68×35 mm and the catalogue ratings are C 60 kN, C0 118 kN, Cur 21.6 kN." }, { "q": "What is the load capacity of the NK55/35-XL?", "a": "The basic dynamic load rating C is 60 kN and the basic static load rating C0 is 118 kN; the fatigue load limit Cur is 21.6 kN." }, { "q": "What is the maximum speed of the NK55/35-XL?", "a": "The limiting speed is 8,400 r/min and the thermal reference speed is 5,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK55/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK55/35-XL has no inner ring, so the 55 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK55-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK55-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×68×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK55-35-XL", "NK55/35-XL" ], "locale_variants": {} }, { "sku": "NKS55-XL", "brand": "FAG", "manufacturer_designation": "NKS55-XL", "series": "nks-series", "type": "needle", "d_mm": 55, "D_mm": 72, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 74, "fatigue_load_limit_kN": 13, "limiting_speed_rpm": 8200, "max_rpm": 8200, "reference_speed_rpm": 5100, "weight_g": 221, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×72×22 mm: 55 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 51 kN and C0 74 kN at the 55 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 13 kN, the limiting speed 8,200 r/min and the thermal reference speed 5,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 2.32 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 221 g, just 0.14 g per mm² of projected 72×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 55 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space Reading the NKS prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The hardness requirement is unforgiving: below about 58 HRC the 55 mm journal brinels under the 74 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 55×72×22 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 72 mm outside diameter and 51 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 55 mm seat, and in two-stroke and compressor piston pins the 221 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 22 mm width and the published 74 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKS55-XL?", "a": "The NKS55-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 72 mm outside diameter, 55 mm bore and 22 mm width, envelope 55×72×22 mm. Mass is 221 g." }, { "q": "What does the NKS55-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS55-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×72×22 mm and the catalogue ratings are C 51 kN, C0 74 kN, Cur 13 kN." }, { "q": "What is the load capacity of the NKS55-XL?", "a": "The basic dynamic load rating C is 51 kN and the basic static load rating C0 is 74 kN; the fatigue load limit Cur is 13 kN." }, { "q": "What is the maximum speed of the NKS55-XL?", "a": "The limiting speed is 8,200 r/min and the thermal reference speed is 5,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS55-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS55-XL has no inner ring, so the 55 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS55", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS55-XL", "NKS55-XL" ], "locale_variants": {} }, { "sku": "RNA4910-XL", "brand": "FAG", "manufacturer_designation": "RNA4910-XL", "series": "rna49-series", "type": "needle", "d_mm": 58, "D_mm": 72, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 80, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 7800, "max_rpm": 7800, "reference_speed_rpm": 4350, "weight_g": 163, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 58×72×22 mm: 58 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 53 kN and C0 80 kN at the 58 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 14.1 kN, the limiting speed 7,800 r/min and the thermal reference speed 4,350 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.91 kN/mm and per millimetre of width 2.41 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 163 g, just 0.10 g per mm² of projected 72×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 58 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space The hardness requirement is unforgiving: below about 58 HRC the 58 mm journal brinels under the 80 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 14.1 kN Cur value. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 72 mm outside diameter and 53 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 58 mm seat, and in two-stroke and compressor piston pins the 163 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 22 mm width and the published 80 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA4910-XL?", "a": "The RNA4910-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 72 mm outside diameter, 58 mm bore and 22 mm width, envelope 58×72×22 mm. Mass is 163 g." }, { "q": "What does the RNA4910-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4910-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 58×72×22 mm and the catalogue ratings are C 53 kN, C0 80 kN, Cur 14.1 kN." }, { "q": "What is the load capacity of the RNA4910-XL?", "a": "The basic dynamic load rating C is 53 kN and the basic static load rating C0 is 80 kN; the fatigue load limit Cur is 14.1 kN." }, { "q": "What is the maximum speed of the RNA4910-XL?", "a": "The limiting speed is 7,800 r/min and the thermal reference speed is 4,350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4910-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4910-XL has no inner ring, so the 58 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4910", "equiv_brand": "SKF", "level": "partial", "note": "Same 58×72×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "RNA4910-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 58×72×22 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4910-XL", "RNA4910-XL" ], "locale_variants": {} }, { "sku": "RNA6910-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6910-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 58, "D_mm": 72, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82, "static_load_kN": 139, "fatigue_load_limit_kN": 23.8, "limiting_speed_rpm": 7800, "max_rpm": 7800, "reference_speed_rpm": 4400, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 58×72×40 mm: 58 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 82 kN and C0 139 kN at the 58 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 23.8 kN, the limiting speed 7,800 r/min and the thermal reference speed 4,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.41 kN/mm and per millimetre of width 2.05 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 310 g, just 0.11 g per mm² of projected 72×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 58 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 40 mm width as a standard mounting space The thin 7.0 mm section makes the 310 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Omitting the inner ring frees radial space — at a 58 mm shaft the outer diameter is only 72 mm and the width 40 mm, yet C is 82 kN The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 7,800 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 58×72 mm ring pair, giving the 82 kN C rating in a housing space sized for a wide single bearing. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 72 mm outside diameter and 82 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 58 mm seat, and in gearbox selector and change linkages the 310 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 40 mm width and the published 139 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA6910-ZW-XL?", "a": "The RNA6910-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 72 mm outside diameter, 58 mm bore and 40 mm width, envelope 58×72×40 mm. Mass is 310 g." }, { "q": "What does the RNA6910-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6910-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 58×72×40 mm and the catalogue ratings are C 82 kN, C0 139 kN, Cur 23.8 kN." }, { "q": "What is the load capacity of the RNA6910-ZW-XL?", "a": "The basic dynamic load rating C is 82 kN and the basic static load rating C0 is 139 kN; the fatigue load limit Cur is 23.8 kN." }, { "q": "What is the maximum speed of the RNA6910-ZW-XL?", "a": "The limiting speed is 7,800 r/min and the thermal reference speed is 4,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6910-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6910-ZW-XL has no inner ring, so the 58 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6910", "equiv_brand": "SKF", "level": "partial", "note": "Same 58×72×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6910-ZW-XL", "RNA6910-ZW-XL" ], "locale_variants": {} }, { "sku": "NK60-25-TV-XL", "brand": "FAG", "manufacturer_designation": "NK60/25-TV-XL", "series": "nk-series", "type": "needle", "d_mm": 60, "D_mm": 72, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 53, "static_load_kN": 103, "fatigue_load_limit_kN": 17.8, "limiting_speed_rpm": 7700, "max_rpm": 7700, "reference_speed_rpm": 4600, "weight_g": 170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×72×25 mm: 60 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 53 kN and C0 103 kN at the 60 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 17.8 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 2.12 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 170 g, just 0.09 g per mm² of projected 72×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 60 mm bore places this bearing in the medium band, where the 72 mm envelope already carries ratings in the tens of kilonewtons With Cur 17.8 kN and a 7,700 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins NK60/25-TV-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 53 kN C rating and longer nominal life come without an envelope change. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 7,700 r/min. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 72 mm outside diameter and 53 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 60 mm seat, and in hydraulic and pneumatic pump eccentrics the 170 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 25 mm width and the published 103 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NK60/25-TV-XL?", "a": "The NK60/25-TV-XL is a NK machined-ring needle roller bearing without inner ring with 72 mm outside diameter, 60 mm bore and 25 mm width, envelope 60×72×25 mm. Mass is 170 g." }, { "q": "What does the NK60/25-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK60/25-TV-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×72×25 mm and the catalogue ratings are C 53 kN, C0 103 kN, Cur 17.8 kN." }, { "q": "What is the load capacity of the NK60/25-TV-XL?", "a": "The basic dynamic load rating C is 53 kN and the basic static load rating C0 is 103 kN; the fatigue load limit Cur is 17.8 kN." }, { "q": "What is the maximum speed of the NK60/25-TV-XL?", "a": "The limiting speed is 7,700 r/min and the thermal reference speed is 4,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK60/25-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK60/25-TV-XL has no inner ring, so the 60 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK60-25-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×72×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK60-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK60-25-TV-XL", "NK60/25-TV-XL" ], "locale_variants": {} }, { "sku": "NK60-35-XL", "brand": "FAG", "manufacturer_designation": "NK60/35-XL", "series": "nk-series", "type": "needle", "d_mm": 60, "D_mm": 72, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63, "static_load_kN": 130, "fatigue_load_limit_kN": 23.9, "limiting_speed_rpm": 7700, "max_rpm": 7700, "reference_speed_rpm": 4800, "weight_g": 258, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×72×35 mm: 60 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 63 kN and C0 130 kN at the 60 mm seat; the C/C0 ratio of 0.48 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 23.9 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.05 kN/mm and per millimetre of width 1.80 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 258 g, just 0.10 g per mm² of projected 72×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 60 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 35 mm width as a standard mounting space The thin 6.0 mm section makes the 258 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting With Cur 23.9 kN and a 7,700 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 23.9 kN Cur value. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 72 mm outside diameter and 63 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 60 mm seat, and in rocker arms and valve trains the 258 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 35 mm width and the published 130 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK60/35-XL?", "a": "The NK60/35-XL is a NK machined-ring needle roller bearing without inner ring with 72 mm outside diameter, 60 mm bore and 35 mm width, envelope 60×72×35 mm. Mass is 258 g." }, { "q": "What does the NK60/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK60/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×72×35 mm and the catalogue ratings are C 63 kN, C0 130 kN, Cur 23.9 kN." }, { "q": "What is the load capacity of the NK60/35-XL?", "a": "The basic dynamic load rating C is 63 kN and the basic static load rating C0 is 130 kN; the fatigue load limit Cur is 23.9 kN." }, { "q": "What is the maximum speed of the NK60/35-XL?", "a": "The limiting speed is 7,700 r/min and the thermal reference speed is 4,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK60/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK60/35-XL has no inner ring, so the 60 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK60-25-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK60-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×72×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK60-35-XL", "NK60/35-XL" ], "locale_variants": {} }, { "sku": "NKS60-XL", "brand": "FAG", "manufacturer_designation": "NKS60-XL", "series": "nks-series", "type": "needle", "d_mm": 60, "D_mm": 80, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 71, "static_load_kN": 98, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 7400, "max_rpm": 7400, "reference_speed_rpm": 4750, "weight_g": 335, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×80×28 mm: 60 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 71 kN and C0 98 kN at the 60 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 80 mm outside diameter the fatigue load limit Cur is 17.6 kN, the limiting speed 7,400 r/min and the thermal reference speed 4,750 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.18 kN/mm and per millimetre of width 2.54 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 335 g, just 0.15 g per mm² of projected 80×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 60 mm bore marks the medium range: mounting forces and fits become critical, and the 335 g mass calls for proper induction or press tooling rather than hand fitting NKS60-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The thin 10.0 mm section makes the 335 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 71 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 80 mm outside diameter and 71 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 60 mm seat, and in copying and printing machine mechanisms the 335 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 28 mm width and the published 98 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKS60-XL?", "a": "The NKS60-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 80 mm outside diameter, 60 mm bore and 28 mm width, envelope 60×80×28 mm. Mass is 335 g." }, { "q": "What does the NKS60-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS60-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×80×28 mm and the catalogue ratings are C 71 kN, C0 98 kN, Cur 17.6 kN." }, { "q": "What is the load capacity of the NKS60-XL?", "a": "The basic dynamic load rating C is 71 kN and the basic static load rating C0 is 98 kN; the fatigue load limit Cur is 17.6 kN." }, { "q": "What is the maximum speed of the NKS60-XL?", "a": "The limiting speed is 7,400 r/min and the thermal reference speed is 4,750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS60-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS60-XL has no inner ring, so the 60 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS60", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×80×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS60-XL", "NKS60-XL" ], "locale_variants": {} }, { "sku": "RNA4911-XL", "brand": "FAG", "manufacturer_designation": "RNA4911-XL", "series": "rna49-series", "type": "needle", "d_mm": 63, "D_mm": 80, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 65, "static_load_kN": 100, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 7200, "max_rpm": 7200, "reference_speed_rpm": 4150, "weight_g": 255, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 63×80×25 mm: 63 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 65 kN and C0 100 kN at the 63 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 80 mm outside diameter the fatigue load limit Cur is 17.6 kN, the limiting speed 7,200 r/min and the thermal reference speed 4,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 2.60 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 255 g, just 0.13 g per mm² of projected 80×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 63 mm bore the 80 mm outside diameter and 25 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 7,200 r/min This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 17.6 kN and a 7,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 65 kN C rating and longer nominal life come without an envelope change. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 80 mm outside diameter and 65 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 63 mm seat, and in agricultural machine pivots and linkages the 255 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 25 mm width and the published 100 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNA4911-XL?", "a": "The RNA4911-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 80 mm outside diameter, 63 mm bore and 25 mm width, envelope 63×80×25 mm. Mass is 255 g." }, { "q": "What does the RNA4911-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4911-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 63×80×25 mm and the catalogue ratings are C 65 kN, C0 100 kN, Cur 17.6 kN." }, { "q": "What is the load capacity of the RNA4911-XL?", "a": "The basic dynamic load rating C is 65 kN and the basic static load rating C0 is 100 kN; the fatigue load limit Cur is 17.6 kN." }, { "q": "What is the maximum speed of the RNA4911-XL?", "a": "The limiting speed is 7,200 r/min and the thermal reference speed is 4,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4911-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4911-XL has no inner ring, so the 63 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4911", "equiv_brand": "SKF", "level": "partial", "note": "Same 63×80×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4911-XL", "RNA4911-XL" ], "locale_variants": {} }, { "sku": "RNA6911-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6911-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 63, "D_mm": 80, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 102, "static_load_kN": 176, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 7200, "max_rpm": 7200, "reference_speed_rpm": 4200, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 63×80×45 mm: 63 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 102 kN and C0 176 kN at the 63 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 80 mm outside diameter the fatigue load limit Cur is 30.5 kN, the limiting speed 7,200 r/min and the thermal reference speed 4,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.62 kN/mm and per millimetre of width 2.27 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 470 g, just 0.13 g per mm² of projected 80×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 63 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading the RNA69 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened RNA6911-ZW-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 7,200 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 63×80 mm ring pair, giving the 102 kN C rating in a housing space sized for a wide single bearing. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 80 mm outside diameter and 102 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 63 mm seat, and in small electric motor accessory drives the 470 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 45 mm width and the published 176 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA6911-ZW-XL?", "a": "The RNA6911-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 80 mm outside diameter, 63 mm bore and 45 mm width, envelope 63×80×45 mm. Mass is 470 g." }, { "q": "What does the RNA6911-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6911-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 63×80×45 mm and the catalogue ratings are C 102 kN, C0 176 kN, Cur 30.5 kN." }, { "q": "What is the load capacity of the RNA6911-ZW-XL?", "a": "The basic dynamic load rating C is 102 kN and the basic static load rating C0 is 176 kN; the fatigue load limit Cur is 30.5 kN." }, { "q": "What is the maximum speed of the RNA6911-ZW-XL?", "a": "The limiting speed is 7,200 r/min and the thermal reference speed is 4,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6911-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6911-ZW-XL has no inner ring, so the 63 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6911", "equiv_brand": "SKF", "level": "partial", "note": "Same 63×80×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6911-ZW-XL", "RNA6911-ZW-XL" ], "locale_variants": {} }, { "sku": "NK65-25-XL", "brand": "FAG", "manufacturer_designation": "NK65/25-XL", "series": "nk-series", "type": "needle", "d_mm": 65, "D_mm": 78, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 50, "static_load_kN": 98, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 7200, "max_rpm": 7200, "reference_speed_rpm": 4500, "weight_g": 221, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×78×25 mm: 65 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 50 kN and C0 98 kN at the 65 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 78 mm outside diameter the fatigue load limit Cur is 17 kN, the limiting speed 7,200 r/min and the thermal reference speed 4,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.77 kN/mm and per millimetre of width 2.00 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 221 g, just 0.11 g per mm² of projected 78×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 65 mm bore the 78 mm outside diameter and 25 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 7,200 r/min The thin 6.5 mm section makes the 221 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Omitting the inner ring frees radial space — at a 65 mm shaft the outer diameter is only 78 mm and the width 25 mm, yet C is 50 kN The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 7,200 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 78 mm outside diameter and 50 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 65 mm seat, and in hydraulic and pneumatic pump eccentrics the 221 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 25 mm width and the published 98 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK65/25-XL?", "a": "The NK65/25-XL is a NK machined-ring needle roller bearing without inner ring with 78 mm outside diameter, 65 mm bore and 25 mm width, envelope 65×78×25 mm. Mass is 221 g." }, { "q": "What does the NK65/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK65/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×78×25 mm and the catalogue ratings are C 50 kN, C0 98 kN, Cur 17 kN." }, { "q": "What is the load capacity of the NK65/25-XL?", "a": "The basic dynamic load rating C is 50 kN and the basic static load rating C0 is 98 kN; the fatigue load limit Cur is 17 kN." }, { "q": "What is the maximum speed of the NK65/25-XL?", "a": "The limiting speed is 7,200 r/min and the thermal reference speed is 4,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK65/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK65/25-XL has no inner ring, so the 65 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK65-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×78×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK65-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK65-25-XL", "NK65/25-XL" ], "locale_variants": {} }, { "sku": "NK65-35-XL", "brand": "FAG", "manufacturer_designation": "NK65/35-XL", "series": "nk-series", "type": "needle", "d_mm": 65, "D_mm": 78, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66, "static_load_kN": 142, "fatigue_load_limit_kN": 26, "limiting_speed_rpm": 7200, "max_rpm": 7200, "reference_speed_rpm": 4450, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×78×35 mm: 65 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 66 kN and C0 142 kN at the 65 mm seat; the C/C0 ratio of 0.46 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 78 mm outside diameter the fatigue load limit Cur is 26 kN, the limiting speed 7,200 r/min and the thermal reference speed 4,450 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.02 kN/mm and per millimetre of width 1.89 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 310 g, just 0.11 g per mm² of projected 78×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 65 mm bore the 78 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 7,200 r/min NK65/35-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality Omitting the inner ring frees radial space — at a 65 mm shaft the outer diameter is only 78 mm and the width 35 mm, yet C is 66 kN X-life status (-XL) indicates the current Schaeffler premium execution at 65 mm bore; the 142 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 78 mm outside diameter and 66 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 65 mm seat, and in two-stroke and compressor piston pins the 310 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 35 mm width and the published 142 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK65/35-XL?", "a": "The NK65/35-XL is a NK machined-ring needle roller bearing without inner ring with 78 mm outside diameter, 65 mm bore and 35 mm width, envelope 65×78×35 mm. Mass is 310 g." }, { "q": "What does the NK65/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK65/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×78×35 mm and the catalogue ratings are C 66 kN, C0 142 kN, Cur 26 kN." }, { "q": "What is the load capacity of the NK65/35-XL?", "a": "The basic dynamic load rating C is 66 kN and the basic static load rating C0 is 142 kN; the fatigue load limit Cur is 26 kN." }, { "q": "What is the maximum speed of the NK65/35-XL?", "a": "The limiting speed is 7,200 r/min and the thermal reference speed is 4,450 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK65/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK65/35-XL has no inner ring, so the 65 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK65-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK65-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×78×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK65-35-XL", "NK65/35-XL" ], "locale_variants": {} }, { "sku": "NKS65-XL", "brand": "FAG", "manufacturer_designation": "NKS65-XL", "series": "nks-series", "type": "needle", "d_mm": 65, "D_mm": 85, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 75, "static_load_kN": 108, "fatigue_load_limit_kN": 19.4, "limiting_speed_rpm": 6900, "max_rpm": 6900, "reference_speed_rpm": 4400, "weight_g": 356, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×85×28 mm: 65 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 75 kN and C0 108 kN at the 65 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 19.4 kN, the limiting speed 6,900 r/min and the thermal reference speed 4,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.15 kN/mm and per millimetre of width 2.68 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 356 g, just 0.15 g per mm² of projected 85×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 65 mm bore the 85 mm outside diameter and 28 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,900 r/min Reading the NKS prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The hardness requirement is unforgiving: below about 58 HRC the 65 mm journal brinels under the 108 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 65×85×28 mm envelope. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 85 mm outside diameter and 75 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 65 mm seat, and in rocker arms and valve trains the 356 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 28 mm width and the published 108 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKS65-XL?", "a": "The NKS65-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 85 mm outside diameter, 65 mm bore and 28 mm width, envelope 65×85×28 mm. Mass is 356 g." }, { "q": "What does the NKS65-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS65-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×85×28 mm and the catalogue ratings are C 75 kN, C0 108 kN, Cur 19.4 kN." }, { "q": "What is the load capacity of the NKS65-XL?", "a": "The basic dynamic load rating C is 75 kN and the basic static load rating C0 is 108 kN; the fatigue load limit Cur is 19.4 kN." }, { "q": "What is the maximum speed of the NKS65-XL?", "a": "The limiting speed is 6,900 r/min and the thermal reference speed is 4,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS65-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS65-XL has no inner ring, so the 65 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS65", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×85×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=953", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS65-XL", "NKS65-XL" ], "locale_variants": {} }, { "sku": "NK68-25-XL", "brand": "FAG", "manufacturer_designation": "NK68/25-XL", "series": "nk-series", "type": "needle", "d_mm": 68, "D_mm": 82, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 49.5, "static_load_kN": 89, "fatigue_load_limit_kN": 15.5, "limiting_speed_rpm": 6800, "max_rpm": 6800, "reference_speed_rpm": 4500, "weight_g": 241, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 68×82×25 mm: 68 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 49.5 kN and C0 89 kN at the 68 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 82 mm outside diameter the fatigue load limit Cur is 15.5 kN, the limiting speed 6,800 r/min and the thermal reference speed 4,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.73 kN/mm and per millimetre of width 1.98 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 241 g, just 0.12 g per mm² of projected 82×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 68 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Omitting the inner ring frees radial space — at a 68 mm shaft the outer diameter is only 82 mm and the width 25 mm, yet C is 49.5 kN The thin 7.0 mm section makes the 241 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 68×82×25 mm envelope. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 82 mm outside diameter and 49.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 68 mm seat, and in connecting-rod small ends the 241 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 25 mm width and the published 89 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK68/25-XL?", "a": "The NK68/25-XL is a NK machined-ring needle roller bearing without inner ring with 82 mm outside diameter, 68 mm bore and 25 mm width, envelope 68×82×25 mm. Mass is 241 g." }, { "q": "What does the NK68/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK68/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 68×82×25 mm and the catalogue ratings are C 49.5 kN, C0 89 kN, Cur 15.5 kN." }, { "q": "What is the load capacity of the NK68/25-XL?", "a": "The basic dynamic load rating C is 49.5 kN and the basic static load rating C0 is 89 kN; the fatigue load limit Cur is 15.5 kN." }, { "q": "What is the maximum speed of the NK68/25-XL?", "a": "The limiting speed is 6,800 r/min and the thermal reference speed is 4,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK68/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK68/25-XL has no inner ring, so the 68 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK68-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 68×82×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK68-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK68-25-XL", "NK68/25-XL" ], "locale_variants": {} }, { "sku": "NK68-35-XL", "brand": "FAG", "manufacturer_designation": "NK68/35-XL", "series": "nk-series", "type": "needle", "d_mm": 68, "D_mm": 82, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 70, "static_load_kN": 139, "fatigue_load_limit_kN": 26, "limiting_speed_rpm": 6800, "max_rpm": 6800, "reference_speed_rpm": 4350, "weight_g": 338, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 68×82×35 mm: 68 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 70 kN and C0 139 kN at the 68 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 82 mm outside diameter the fatigue load limit Cur is 26 kN, the limiting speed 6,800 r/min and the thermal reference speed 4,350 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 2.00 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 338 g, just 0.12 g per mm² of projected 82×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 68 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery NK68/35-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 6,800 r/min limit. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 82 mm outside diameter and 70 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 68 mm seat, and in planetary gear bearings the 338 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 35 mm width and the published 139 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK68/35-XL?", "a": "The NK68/35-XL is a NK machined-ring needle roller bearing without inner ring with 82 mm outside diameter, 68 mm bore and 35 mm width, envelope 68×82×35 mm. Mass is 338 g." }, { "q": "What does the NK68/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK68/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 68×82×35 mm and the catalogue ratings are C 70 kN, C0 139 kN, Cur 26 kN." }, { "q": "What is the load capacity of the NK68/35-XL?", "a": "The basic dynamic load rating C is 70 kN and the basic static load rating C0 is 139 kN; the fatigue load limit Cur is 26 kN." }, { "q": "What is the maximum speed of the NK68/35-XL?", "a": "The limiting speed is 6,800 r/min and the thermal reference speed is 4,350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK68/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK68/35-XL has no inner ring, so the 68 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK68-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK68-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 68×82×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK68-35-XL", "NK68/35-XL" ], "locale_variants": {} }, { "sku": "RNA4912-XL", "brand": "FAG", "manufacturer_designation": "RNA4912-XL", "series": "rna49-series", "type": "needle", "d_mm": 68, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 108, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 6700, "max_rpm": 6700, "reference_speed_rpm": 3850, "weight_g": 275, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 68×85×25 mm: 68 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 68 kN and C0 108 kN at the 68 mm seat; the C/C0 ratio of 0.63 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 19.1 kN, the limiting speed 6,700 r/min and the thermal reference speed 3,850 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.00 kN/mm and per millimetre of width 2.72 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 275 g, just 0.13 g per mm² of projected 85×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 68 mm bore the 85 mm outside diameter and 25 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,700 r/min This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces RNA4912-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 68 kN C rating and longer nominal life come without an envelope change. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 85 mm outside diameter and 68 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 68 mm seat, and in motorcycle and light-vehicle transmissions the 275 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 25 mm width and the published 108 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4912-XL?", "a": "The RNA4912-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 85 mm outside diameter, 68 mm bore and 25 mm width, envelope 68×85×25 mm. Mass is 275 g." }, { "q": "What does the RNA4912-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4912-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 68×85×25 mm and the catalogue ratings are C 68 kN, C0 108 kN, Cur 19.1 kN." }, { "q": "What is the load capacity of the RNA4912-XL?", "a": "The basic dynamic load rating C is 68 kN and the basic static load rating C0 is 108 kN; the fatigue load limit Cur is 19.1 kN." }, { "q": "What is the maximum speed of the RNA4912-XL?", "a": "The limiting speed is 6,700 r/min and the thermal reference speed is 3,850 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4912-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4912-XL has no inner ring, so the 68 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4912", "equiv_brand": "SKF", "level": "partial", "note": "Same 68×85×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4912-XL", "RNA4912-XL" ], "locale_variants": {} }, { "sku": "RNA6912-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6912-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 68, "D_mm": 85, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 191, "fatigue_load_limit_kN": 33, "limiting_speed_rpm": 6700, "max_rpm": 6700, "reference_speed_rpm": 3850, "weight_g": 488, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 68×85×45 mm: 68 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 106 kN and C0 191 kN at the 68 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 33 kN, the limiting speed 6,700 r/min and the thermal reference speed 3,850 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.56 kN/mm and per millimetre of width 2.36 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 488 g, just 0.13 g per mm² of projected 85×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 68 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The thin 8.5 mm section makes the 488 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting RNA6912-ZW-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 6,700 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 68×85 mm ring pair, giving the 106 kN C rating in a housing space sized for a wide single bearing. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 85 mm outside diameter and 106 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 68 mm seat, and in rocker arms and valve trains the 488 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 45 mm width and the published 191 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA6912-ZW-XL?", "a": "The RNA6912-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 85 mm outside diameter, 68 mm bore and 45 mm width, envelope 68×85×45 mm. Mass is 488 g." }, { "q": "What does the RNA6912-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6912-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 68×85×45 mm and the catalogue ratings are C 106 kN, C0 191 kN, Cur 33 kN." }, { "q": "What is the load capacity of the RNA6912-ZW-XL?", "a": "The basic dynamic load rating C is 106 kN and the basic static load rating C0 is 191 kN; the fatigue load limit Cur is 33 kN." }, { "q": "What is the maximum speed of the RNA6912-ZW-XL?", "a": "The limiting speed is 6,700 r/min and the thermal reference speed is 3,850 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6912-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6912-ZW-XL has no inner ring, so the 68 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6912", "equiv_brand": "SKF", "level": "partial", "note": "Same 68×85×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6912-ZW-XL", "RNA6912-ZW-XL" ], "locale_variants": {} }, { "sku": "NK70-25-XL", "brand": "FAG", "manufacturer_designation": "NK70/25-XL", "series": "nk-series", "type": "needle", "d_mm": 70, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 50, "static_load_kN": 92, "fatigue_load_limit_kN": 16, "limiting_speed_rpm": 6600, "max_rpm": 6600, "reference_speed_rpm": 4450, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×85×25 mm: 70 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 50 kN and C0 92 kN at the 70 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 16 kN, the limiting speed 6,600 r/min and the thermal reference speed 4,450 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.71 kN/mm and per millimetre of width 2.00 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 260 g, just 0.12 g per mm² of projected 85×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 70 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The hardness requirement is unforgiving: below about 58 HRC the 70 mm journal brinels under the 92 kN static rating, and roughness above raceway finish accelerates roller wear The thin 7.5 mm section makes the 260 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 16 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 85 mm outside diameter and 50 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 70 mm seat, and in connecting-rod small ends the 260 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 25 mm width and the published 92 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK70/25-XL?", "a": "The NK70/25-XL is a NK machined-ring needle roller bearing without inner ring with 85 mm outside diameter, 70 mm bore and 25 mm width, envelope 70×85×25 mm. Mass is 260 g." }, { "q": "What does the NK70/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK70/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×85×25 mm and the catalogue ratings are C 50 kN, C0 92 kN, Cur 16 kN." }, { "q": "What is the load capacity of the NK70/25-XL?", "a": "The basic dynamic load rating C is 50 kN and the basic static load rating C0 is 92 kN; the fatigue load limit Cur is 16 kN." }, { "q": "What is the maximum speed of the NK70/25-XL?", "a": "The limiting speed is 6,600 r/min and the thermal reference speed is 4,450 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK70/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK70/25-XL has no inner ring, so the 70 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK70-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×85×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK70-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK70-25-XL", "NK70/25-XL" ], "locale_variants": {} }, { "sku": "NK70-35-XL", "brand": "FAG", "manufacturer_designation": "NK70/35-XL", "series": "nk-series", "type": "needle", "d_mm": 70, "D_mm": 85, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 71, "static_load_kN": 144, "fatigue_load_limit_kN": 27, "limiting_speed_rpm": 6600, "max_rpm": 6600, "reference_speed_rpm": 4300, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×85×35 mm: 70 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 71 kN and C0 144 kN at the 70 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 27 kN, the limiting speed 6,600 r/min and the thermal reference speed 4,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 2.03 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 370 g, just 0.12 g per mm² of projected 85×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 70 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The thin 7.5 mm section makes the 370 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 71 kN C rating and longer nominal life come without an envelope change. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 85 mm outside diameter and 71 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 70 mm seat, and in planetary gear bearings the 370 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 35 mm width and the published 144 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK70/35-XL?", "a": "The NK70/35-XL is a NK machined-ring needle roller bearing without inner ring with 85 mm outside diameter, 70 mm bore and 35 mm width, envelope 70×85×35 mm. Mass is 370 g." }, { "q": "What does the NK70/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK70/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×85×35 mm and the catalogue ratings are C 71 kN, C0 144 kN, Cur 27 kN." }, { "q": "What is the load capacity of the NK70/35-XL?", "a": "The basic dynamic load rating C is 71 kN and the basic static load rating C0 is 144 kN; the fatigue load limit Cur is 27 kN." }, { "q": "What is the maximum speed of the NK70/35-XL?", "a": "The limiting speed is 6,600 r/min and the thermal reference speed is 4,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK70/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK70/35-XL has no inner ring, so the 70 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK70-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK70-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×85×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK70-35-XL", "NK70/35-XL" ], "locale_variants": {} }, { "sku": "NKS70-XL", "brand": "FAG", "manufacturer_designation": "NKS70-XL", "series": "nks-series", "type": "needle", "d_mm": 70, "D_mm": 90, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 77, "static_load_kN": 113, "fatigue_load_limit_kN": 20.4, "limiting_speed_rpm": 6400, "max_rpm": 6400, "reference_speed_rpm": 4200, "weight_g": 380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×90×28 mm: 70 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 77 kN and C0 113 kN at the 70 mm seat; the C/C0 ratio of 0.68 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 20.4 kN, the limiting speed 6,400 r/min and the thermal reference speed 4,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.10 kN/mm and per millimetre of width 2.75 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 380 g, just 0.15 g per mm² of projected 90×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 70 mm bore this is a heavy-industrial bearing: 380 g of stiff ring and roller set, specified where rigidity matters more than speed Omitting the inner ring frees radial space — at a 70 mm shaft the outer diameter is only 90 mm and the width 28 mm, yet C is 77 kN NKS70-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 77 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 90 mm outside diameter and 77 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 70 mm seat, and in hydraulic and pneumatic pump eccentrics the 380 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 28 mm width and the published 113 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKS70-XL?", "a": "The NKS70-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 90 mm outside diameter, 70 mm bore and 28 mm width, envelope 70×90×28 mm. Mass is 380 g." }, { "q": "What does the NKS70-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS70-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×90×28 mm and the catalogue ratings are C 77 kN, C0 113 kN, Cur 20.4 kN." }, { "q": "What is the load capacity of the NKS70-XL?", "a": "The basic dynamic load rating C is 77 kN and the basic static load rating C0 is 113 kN; the fatigue load limit Cur is 20.4 kN." }, { "q": "What is the maximum speed of the NKS70-XL?", "a": "The limiting speed is 6,400 r/min and the thermal reference speed is 4,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS70-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS70-XL has no inner ring, so the 70 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS70", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×90×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS70-XL", "NKS70-XL" ], "locale_variants": {} }, { "sku": "RNA4913-XL", "brand": "FAG", "manufacturer_designation": "RNA4913-XL", "series": "rna49-series", "type": "needle", "d_mm": 72, "D_mm": 90, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69, "static_load_kN": 112, "fatigue_load_limit_kN": 19.9, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 3650, "weight_g": 312, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 72×90×25 mm: 72 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 69 kN and C0 112 kN at the 72 mm seat; the C/C0 ratio of 0.62 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 19.9 kN, the limiting speed 6,300 r/min and the thermal reference speed 3,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 2.76 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 312 g, just 0.14 g per mm² of projected 90×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 72 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened RNA4913-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 69 kN C rating and longer nominal life come without an envelope change. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 90 mm outside diameter and 69 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 72 mm seat, and in rocker arms and valve trains the 312 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 25 mm width and the published 112 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4913-XL?", "a": "The RNA4913-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 90 mm outside diameter, 72 mm bore and 25 mm width, envelope 72×90×25 mm. Mass is 312 g." }, { "q": "What does the RNA4913-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4913-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 72×90×25 mm and the catalogue ratings are C 69 kN, C0 112 kN, Cur 19.9 kN." }, { "q": "What is the load capacity of the RNA4913-XL?", "a": "The basic dynamic load rating C is 69 kN and the basic static load rating C0 is 112 kN; the fatigue load limit Cur is 19.9 kN." }, { "q": "What is the maximum speed of the RNA4913-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 3,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4913-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4913-XL has no inner ring, so the 72 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4913", "equiv_brand": "SKF", "level": "partial", "note": "Same 72×90×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4913-XL", "RNA4913-XL" ], "locale_variants": {} }, { "sku": "RNA6913-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6913-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 72, "D_mm": 90, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 108, "static_load_kN": 198, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 3650, "weight_g": 580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 72×90×45 mm: 72 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 108 kN and C0 198 kN at the 72 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 34.5 kN, the limiting speed 6,300 r/min and the thermal reference speed 3,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.50 kN/mm and per millimetre of width 2.40 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 580 g, just 0.14 g per mm² of projected 90×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 72 mm bore this is a heavy-industrial bearing: 580 g of stiff ring and roller set, specified where rigidity matters more than speed The thin 9.0 mm section makes the 580 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 72×90×45 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 45 mm width while the outside diameter stays a compact 90 mm. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 90 mm outside diameter and 108 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 72 mm seat, and in hydraulic and pneumatic pump eccentrics the 580 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 45 mm width and the published 198 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA6913-ZW-XL?", "a": "The RNA6913-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 90 mm outside diameter, 72 mm bore and 45 mm width, envelope 72×90×45 mm. Mass is 580 g." }, { "q": "What does the RNA6913-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6913-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 72×90×45 mm and the catalogue ratings are C 108 kN, C0 198 kN, Cur 34.5 kN." }, { "q": "What is the load capacity of the RNA6913-ZW-XL?", "a": "The basic dynamic load rating C is 108 kN and the basic static load rating C0 is 198 kN; the fatigue load limit Cur is 34.5 kN." }, { "q": "What is the maximum speed of the RNA6913-ZW-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 3,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6913-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6913-ZW-XL has no inner ring, so the 72 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6913", "equiv_brand": "SKF", "level": "partial", "note": "Same 72×90×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6913-ZW-XL", "RNA6913-ZW-XL" ], "locale_variants": {} }, { "sku": "NK73-25-XL", "brand": "FAG", "manufacturer_designation": "NK73/25-XL", "series": "nk-series", "type": "needle", "d_mm": 73, "D_mm": 90, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 60, "static_load_kN": 100, "fatigue_load_limit_kN": 17.9, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 4150, "weight_g": 302, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 73×90×25 mm: 73 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 60 kN and C0 100 kN at the 73 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 17.9 kN, the limiting speed 6,300 r/min and the thermal reference speed 4,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.82 kN/mm and per millimetre of width 2.40 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 302 g, just 0.13 g per mm² of projected 90×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 73 mm bore this is a heavy-industrial bearing: 302 g of stiff ring and roller set, specified where rigidity matters more than speed Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened Omitting the inner ring frees radial space — at a 73 mm shaft the outer diameter is only 90 mm and the width 25 mm, yet C is 60 kN X-life status (-XL) indicates the current Schaeffler premium execution at 73 mm bore; the 100 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 90 mm outside diameter and 60 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 73 mm seat, and in rocker arms and valve trains the 302 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 25 mm width and the published 100 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK73/25-XL?", "a": "The NK73/25-XL is a NK machined-ring needle roller bearing without inner ring with 90 mm outside diameter, 73 mm bore and 25 mm width, envelope 73×90×25 mm. Mass is 302 g." }, { "q": "What does the NK73/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK73/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 73×90×25 mm and the catalogue ratings are C 60 kN, C0 100 kN, Cur 17.9 kN." }, { "q": "What is the load capacity of the NK73/25-XL?", "a": "The basic dynamic load rating C is 60 kN and the basic static load rating C0 is 100 kN; the fatigue load limit Cur is 17.9 kN." }, { "q": "What is the maximum speed of the NK73/25-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 4,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK73/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK73/25-XL has no inner ring, so the 73 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK73-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 73×90×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK73-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK73-25-XL", "NK73/25-XL" ], "locale_variants": {} }, { "sku": "NK73-35-XL", "brand": "FAG", "manufacturer_designation": "NK73/35-XL", "series": "nk-series", "type": "needle", "d_mm": 73, "D_mm": 90, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 85, "static_load_kN": 156, "fatigue_load_limit_kN": 27.5, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 4050, "weight_g": 428, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 73×90×35 mm: 73 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 85 kN and C0 156 kN at the 73 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 27.5 kN, the limiting speed 6,300 r/min and the thermal reference speed 4,050 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.16 kN/mm and per millimetre of width 2.43 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 428 g, just 0.14 g per mm² of projected 90×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 73 mm bore this is a heavy-industrial bearing: 428 g of stiff ring and roller set, specified where rigidity matters more than speed The thin 8.5 mm section makes the 428 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 27.5 kN Cur value. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 90 mm outside diameter and 85 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 73 mm seat, and in hydraulic and pneumatic pump eccentrics the 428 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 35 mm width and the published 156 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK73/35-XL?", "a": "The NK73/35-XL is a NK machined-ring needle roller bearing without inner ring with 90 mm outside diameter, 73 mm bore and 35 mm width, envelope 73×90×35 mm. Mass is 428 g." }, { "q": "What does the NK73/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK73/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 73×90×35 mm and the catalogue ratings are C 85 kN, C0 156 kN, Cur 27.5 kN." }, { "q": "What is the load capacity of the NK73/35-XL?", "a": "The basic dynamic load rating C is 85 kN and the basic static load rating C0 is 156 kN; the fatigue load limit Cur is 27.5 kN." }, { "q": "What is the maximum speed of the NK73/35-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 4,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK73/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK73/35-XL has no inner ring, so the 73 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK73-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK73-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 73×90×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK73-35-XL", "NK73/35-XL" ], "locale_variants": {} }, { "sku": "NK75-25-XL", "brand": "FAG", "manufacturer_designation": "NK75/25-XL", "series": "nk-series", "type": "needle", "d_mm": 75, "D_mm": 92, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 61, "static_load_kN": 104, "fatigue_load_limit_kN": 18.5, "limiting_speed_rpm": 6100, "max_rpm": 6100, "reference_speed_rpm": 4050, "weight_g": 315, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×92×25 mm: 75 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 61 kN and C0 104 kN at the 75 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 92 mm outside diameter the fatigue load limit Cur is 18.5 kN, the limiting speed 6,100 r/min and the thermal reference speed 4,050 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.81 kN/mm and per millimetre of width 2.44 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 315 g, just 0.14 g per mm² of projected 92×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 75 mm bore the 92 mm outside diameter and 25 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,100 r/min With Cur 18.5 kN and a 6,100 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The hardness requirement is unforgiving: below about 58 HRC the 75 mm journal brinels under the 104 kN static rating, and roughness above raceway finish accelerates roller wear X-life status (-XL) indicates the current Schaeffler premium execution at 75 mm bore; the 104 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 92 mm outside diameter and 61 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 75 mm seat, and in connecting-rod small ends the 315 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 25 mm width and the published 104 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK75/25-XL?", "a": "The NK75/25-XL is a NK machined-ring needle roller bearing without inner ring with 92 mm outside diameter, 75 mm bore and 25 mm width, envelope 75×92×25 mm. Mass is 315 g." }, { "q": "What does the NK75/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK75/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×92×25 mm and the catalogue ratings are C 61 kN, C0 104 kN, Cur 18.5 kN." }, { "q": "What is the load capacity of the NK75/25-XL?", "a": "The basic dynamic load rating C is 61 kN and the basic static load rating C0 is 104 kN; the fatigue load limit Cur is 18.5 kN." }, { "q": "What is the maximum speed of the NK75/25-XL?", "a": "The limiting speed is 6,100 r/min and the thermal reference speed is 4,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK75/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK75/25-XL has no inner ring, so the 75 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK75-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×92×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK75-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK75-25-XL", "NK75/25-XL" ], "locale_variants": {} }, { "sku": "NK75-35-XL", "brand": "FAG", "manufacturer_designation": "NK75/35-XL", "series": "nk-series", "type": "needle", "d_mm": 75, "D_mm": 92, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 87, "static_load_kN": 162, "fatigue_load_limit_kN": 28.5, "limiting_speed_rpm": 6100, "max_rpm": 6100, "reference_speed_rpm": 3950, "weight_g": 445, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×92×35 mm: 75 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 87 kN and C0 162 kN at the 75 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 92 mm outside diameter the fatigue load limit Cur is 28.5 kN, the limiting speed 6,100 r/min and the thermal reference speed 3,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.16 kN/mm and per millimetre of width 2.49 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 445 g, just 0.14 g per mm² of projected 92×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 75 mm bore the 92 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,100 r/min The thin 8.5 mm section makes the 445 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The hardness requirement is unforgiving: below about 58 HRC the 75 mm journal brinels under the 162 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 28.5 kN Cur value. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 92 mm outside diameter and 87 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 75 mm seat, and in planetary gear bearings the 445 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 35 mm width and the published 162 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK75/35-XL?", "a": "The NK75/35-XL is a NK machined-ring needle roller bearing without inner ring with 92 mm outside diameter, 75 mm bore and 35 mm width, envelope 75×92×35 mm. Mass is 445 g." }, { "q": "What does the NK75/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK75/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×92×35 mm and the catalogue ratings are C 87 kN, C0 162 kN, Cur 28.5 kN." }, { "q": "What is the load capacity of the NK75/35-XL?", "a": "The basic dynamic load rating C is 87 kN and the basic static load rating C0 is 162 kN; the fatigue load limit Cur is 28.5 kN." }, { "q": "What is the maximum speed of the NK75/35-XL?", "a": "The limiting speed is 6,100 r/min and the thermal reference speed is 3,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK75/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK75/35-XL has no inner ring, so the 75 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK75-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK75-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×92×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK75-35-XL", "NK75/35-XL" ], "locale_variants": {} }, { "sku": "NKS75-XL", "brand": "FAG", "manufacturer_designation": "NKS75-XL", "series": "nks-series", "type": "needle", "d_mm": 75, "D_mm": 95, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 81, "static_load_kN": 123, "fatigue_load_limit_kN": 22.2, "limiting_speed_rpm": 6000, "max_rpm": 6000, "reference_speed_rpm": 3950, "weight_g": 402, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×95×28 mm: 75 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 81 kN and C0 123 kN at the 75 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 95 mm outside diameter the fatigue load limit Cur is 22.2 kN, the limiting speed 6,000 r/min and the thermal reference speed 3,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.08 kN/mm and per millimetre of width 2.89 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 402 g, just 0.15 g per mm² of projected 95×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 75 mm bore the 95 mm outside diameter and 28 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,000 r/min The hardness requirement is unforgiving: below about 58 HRC the 75 mm journal brinels under the 123 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 6,000 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 95 mm outside diameter and 81 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 75 mm seat, and in hydraulic and pneumatic pump eccentrics the 402 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 28 mm width and the published 123 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKS75-XL?", "a": "The NKS75-XL is a NKS heavy-section machined-ring needle roller bearing without inner ring with 95 mm outside diameter, 75 mm bore and 28 mm width, envelope 75×95×28 mm. Mass is 402 g." }, { "q": "What does the NKS75-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKS75-XL identifies this NKS heavy-section machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×95×28 mm and the catalogue ratings are C 81 kN, C0 123 kN, Cur 22.2 kN." }, { "q": "What is the load capacity of the NKS75-XL?", "a": "The basic dynamic load rating C is 81 kN and the basic static load rating C0 is 123 kN; the fatigue load limit Cur is 22.2 kN." }, { "q": "What is the maximum speed of the NKS75-XL?", "a": "The limiting speed is 6,000 r/min and the thermal reference speed is 3,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NKS75-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NKS75-XL has no inner ring, so the 75 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NKS75", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×95×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKS75-XL", "NKS75-XL" ], "locale_variants": {} }, { "sku": "NK80-25-XL", "brand": "FAG", "manufacturer_designation": "NK80/25-XL", "series": "nk-series", "type": "needle", "d_mm": 80, "D_mm": 95, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63, "static_load_kN": 119, "fatigue_load_limit_kN": 20, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3750, "weight_g": 301, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×95×25 mm: 80 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 63 kN and C0 119 kN at the 80 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 95 mm outside diameter the fatigue load limit Cur is 20 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,750 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.79 kN/mm and per millimetre of width 2.52 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 301 g, just 0.13 g per mm² of projected 95×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 80 mm bore this is a heavy-industrial bearing: 301 g of stiff ring and roller set, specified where rigidity matters more than speed NK80/25-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The thin 7.5 mm section makes the 301 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 63 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 95 mm outside diameter and 63 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 80 mm seat, and in two-stroke and compressor piston pins the 301 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 25 mm width and the published 119 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NK80/25-XL?", "a": "The NK80/25-XL is a NK machined-ring needle roller bearing without inner ring with 95 mm outside diameter, 80 mm bore and 25 mm width, envelope 80×95×25 mm. Mass is 301 g." }, { "q": "What does the NK80/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK80/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×95×25 mm and the catalogue ratings are C 63 kN, C0 119 kN, Cur 20 kN." }, { "q": "What is the load capacity of the NK80/25-XL?", "a": "The basic dynamic load rating C is 63 kN and the basic static load rating C0 is 119 kN; the fatigue load limit Cur is 20 kN." }, { "q": "What is the maximum speed of the NK80/25-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK80/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK80/25-XL has no inner ring, so the 80 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK80-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×95×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK80-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK80-25-XL", "NK80/25-XL" ], "locale_variants": {} }, { "sku": "NK80-35-XL", "brand": "FAG", "manufacturer_designation": "NK80/35-XL", "series": "nk-series", "type": "needle", "d_mm": 80, "D_mm": 95, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 89, "static_load_kN": 184, "fatigue_load_limit_kN": 33, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3650, "weight_g": 425, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×95×35 mm: 80 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 89 kN and C0 184 kN at the 80 mm seat; the C/C0 ratio of 0.48 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 95 mm outside diameter the fatigue load limit Cur is 33 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.11 kN/mm and per millimetre of width 2.54 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 425 g, just 0.13 g per mm² of projected 95×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 80 mm bore this is a heavy-industrial bearing: 425 g of stiff ring and roller set, specified where rigidity matters more than speed The hardness requirement is unforgiving: below about 58 HRC the 80 mm journal brinels under the 184 kN static rating, and roughness above raceway finish accelerates roller wear Omitting the inner ring frees radial space — at a 80 mm shaft the outer diameter is only 95 mm and the width 35 mm, yet C is 89 kN The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 80×95×35 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 95 mm outside diameter and 89 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 80 mm seat, and in copying and printing machine mechanisms the 425 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 35 mm width and the published 184 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK80/35-XL?", "a": "The NK80/35-XL is a NK machined-ring needle roller bearing without inner ring with 95 mm outside diameter, 80 mm bore and 35 mm width, envelope 80×95×35 mm. Mass is 425 g." }, { "q": "What does the NK80/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK80/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×95×35 mm and the catalogue ratings are C 89 kN, C0 184 kN, Cur 33 kN." }, { "q": "What is the load capacity of the NK80/35-XL?", "a": "The basic dynamic load rating C is 89 kN and the basic static load rating C0 is 184 kN; the fatigue load limit Cur is 33 kN." }, { "q": "What is the maximum speed of the NK80/35-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK80/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK80/35-XL has no inner ring, so the 80 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK80-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK80-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×95×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK80-35-XL", "NK80/35-XL" ], "locale_variants": {} }, { "sku": "RNA4914-XL", "brand": "FAG", "manufacturer_designation": "RNA4914-XL", "series": "rna49-series", "type": "needle", "d_mm": 80, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 95, "static_load_kN": 156, "fatigue_load_limit_kN": 28, "limiting_speed_rpm": 5700, "max_rpm": 5700, "reference_speed_rpm": 3400, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×100×30 mm: 80 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 95 kN and C0 156 kN at the 80 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 100 mm outside diameter the fatigue load limit Cur is 28 kN, the limiting speed 5,700 r/min and the thermal reference speed 3,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.19 kN/mm and per millimetre of width 3.17 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 460 g, just 0.15 g per mm² of projected 100×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 80 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Omitting the inner ring frees radial space — at a 80 mm shaft the outer diameter is only 100 mm and the width 30 mm, yet C is 95 kN RNA4914-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 80×100×30 mm envelope. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 100 mm outside diameter and 95 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 80 mm seat, and in textile machine heald and cam shafts the 460 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 156 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4914-XL?", "a": "The RNA4914-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 100 mm outside diameter, 80 mm bore and 30 mm width, envelope 80×100×30 mm. Mass is 460 g." }, { "q": "What does the RNA4914-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4914-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×100×30 mm and the catalogue ratings are C 95 kN, C0 156 kN, Cur 28 kN." }, { "q": "What is the load capacity of the RNA4914-XL?", "a": "The basic dynamic load rating C is 95 kN and the basic static load rating C0 is 156 kN; the fatigue load limit Cur is 28 kN." }, { "q": "What is the maximum speed of the RNA4914-XL?", "a": "The limiting speed is 5,700 r/min and the thermal reference speed is 3,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4914-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4914-XL has no inner ring, so the 80 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4914", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4914-XL", "RNA4914-XL" ], "locale_variants": {} }, { "sku": "RNA6914-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6914-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 80, "D_mm": 100, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 145, "static_load_kN": 265, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 5700, "max_rpm": 5700, "reference_speed_rpm": 3450, "weight_g": 857, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×100×54 mm: 80 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 145 kN and C0 265 kN at the 80 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 100 mm outside diameter the fatigue load limit Cur is 48 kN, the limiting speed 5,700 r/min and the thermal reference speed 3,450 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.81 kN/mm and per millimetre of width 2.69 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 857 g, just 0.16 g per mm² of projected 100×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 80 mm bore this is a heavy-industrial bearing: 857 g of stiff ring and roller set, specified where rigidity matters more than speed RNA6914-ZW-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality Omitting the inner ring frees radial space — at a 80 mm shaft the outer diameter is only 100 mm and the width 54 mm, yet C is 145 kN The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 80×100×54 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 54 mm width while the outside diameter stays a compact 100 mm. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 100 mm outside diameter and 145 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 80 mm seat, and in copying and printing machine mechanisms the 857 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 54 mm width and the published 265 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNA6914-ZW-XL?", "a": "The RNA6914-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 100 mm outside diameter, 80 mm bore and 54 mm width, envelope 80×100×54 mm. Mass is 857 g." }, { "q": "What does the RNA6914-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6914-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×100×54 mm and the catalogue ratings are C 145 kN, C0 265 kN, Cur 48 kN." }, { "q": "What is the load capacity of the RNA6914-ZW-XL?", "a": "The basic dynamic load rating C is 145 kN and the basic static load rating C0 is 265 kN; the fatigue load limit Cur is 48 kN." }, { "q": "What is the maximum speed of the RNA6914-ZW-XL?", "a": "The limiting speed is 5,700 r/min and the thermal reference speed is 3,450 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6914-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6914-ZW-XL has no inner ring, so the 80 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6914", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×100×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6914-ZW-XL", "RNA6914-ZW-XL" ], "locale_variants": {} }, { "sku": "NK85-25-XL", "brand": "FAG", "manufacturer_designation": "NK85/25-XL", "series": "nk-series", "type": "needle", "d_mm": 85, "D_mm": 105, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 78, "static_load_kN": 123, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3550, "weight_g": 425, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×105×25 mm: 85 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 78 kN and C0 123 kN at the 85 mm seat; the C/C0 ratio of 0.63 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 22.1 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,550 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 3.12 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 425 g, just 0.16 g per mm² of projected 105×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 85 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces With Cur 22.1 kN and a 5,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 22.1 kN Cur value. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 105 mm outside diameter and 78 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 85 mm seat, and in two-stroke and compressor piston pins the 425 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 25 mm width and the published 123 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NK85/25-XL?", "a": "The NK85/25-XL is a NK machined-ring needle roller bearing without inner ring with 105 mm outside diameter, 85 mm bore and 25 mm width, envelope 85×105×25 mm. Mass is 425 g." }, { "q": "What does the NK85/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK85/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×105×25 mm and the catalogue ratings are C 78 kN, C0 123 kN, Cur 22.1 kN." }, { "q": "What is the load capacity of the NK85/25-XL?", "a": "The basic dynamic load rating C is 78 kN and the basic static load rating C0 is 123 kN; the fatigue load limit Cur is 22.1 kN." }, { "q": "What is the maximum speed of the NK85/25-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK85/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK85/25-XL has no inner ring, so the 85 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK85-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×105×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK85-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK85-25-XL", "NK85/25-XL" ], "locale_variants": {} }, { "sku": "NK85-35-XL", "brand": "FAG", "manufacturer_designation": "NK85/35-XL", "series": "nk-series", "type": "needle", "d_mm": 85, "D_mm": 105, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 111, "static_load_kN": 193, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3450, "weight_g": 600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×105×35 mm: 85 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 111 kN and C0 193 kN at the 85 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 35 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,450 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.31 kN/mm and per millimetre of width 3.17 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 600 g, just 0.16 g per mm² of projected 105×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 85 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The thin 10.0 mm section makes the 600 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 111 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 105 mm outside diameter and 111 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 85 mm seat, and in copying and printing machine mechanisms the 600 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 35 mm width and the published 193 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK85/35-XL?", "a": "The NK85/35-XL is a NK machined-ring needle roller bearing without inner ring with 105 mm outside diameter, 85 mm bore and 35 mm width, envelope 85×105×35 mm. Mass is 600 g." }, { "q": "What does the NK85/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK85/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×105×35 mm and the catalogue ratings are C 111 kN, C0 193 kN, Cur 35 kN." }, { "q": "What is the load capacity of the NK85/35-XL?", "a": "The basic dynamic load rating C is 111 kN and the basic static load rating C0 is 193 kN; the fatigue load limit Cur is 35 kN." }, { "q": "What is the maximum speed of the NK85/35-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,450 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK85/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK85/35-XL has no inner ring, so the 85 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK85-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK85-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×105×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK85-35-XL", "NK85/35-XL" ], "locale_variants": {} }, { "sku": "RNA4915-XL", "brand": "FAG", "manufacturer_designation": "RNA4915-XL", "series": "rna49-series", "type": "needle", "d_mm": 85, "D_mm": 105, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 97, "static_load_kN": 162, "fatigue_load_limit_kN": 29, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3200, "weight_g": 489, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×105×30 mm: 85 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 97 kN and C0 162 kN at the 85 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 29 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.14 kN/mm and per millimetre of width 3.23 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 489 g, just 0.16 g per mm² of projected 105×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 85 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The hardness requirement is unforgiving: below about 58 HRC the 85 mm journal brinels under the 162 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 85×105×30 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 105 mm outside diameter and 97 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 85 mm seat, and in two-stroke and compressor piston pins the 489 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 30 mm width and the published 162 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4915-XL?", "a": "The RNA4915-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 105 mm outside diameter, 85 mm bore and 30 mm width, envelope 85×105×30 mm. Mass is 489 g." }, { "q": "What does the RNA4915-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4915-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×105×30 mm and the catalogue ratings are C 97 kN, C0 162 kN, Cur 29 kN." }, { "q": "What is the load capacity of the RNA4915-XL?", "a": "The basic dynamic load rating C is 97 kN and the basic static load rating C0 is 162 kN; the fatigue load limit Cur is 29 kN." }, { "q": "What is the maximum speed of the RNA4915-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4915-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4915-XL has no inner ring, so the 85 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4915", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×105×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4915-XL", "RNA4915-XL" ], "locale_variants": {} }, { "sku": "RNA6915-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6915-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 85, "D_mm": 105, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 147, "static_load_kN": 275, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3250, "weight_g": 935, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×105×54 mm: 85 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 147 kN and C0 275 kN at the 85 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 50 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.73 kN/mm and per millimetre of width 2.72 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 935 g, just 0.16 g per mm² of projected 105×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 85 mm bore the 105 mm outside diameter and 54 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,400 r/min Omitting the inner ring frees radial space — at a 85 mm shaft the outer diameter is only 105 mm and the width 54 mm, yet C is 147 kN With Cur 50 kN and a 5,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 85×105×54 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 54 mm width while the outside diameter stays a compact 105 mm. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 105 mm outside diameter and 147 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 85 mm seat, and in planetary gear bearings the 935 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 54 mm width and the published 275 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA6915-ZW-XL?", "a": "The RNA6915-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 105 mm outside diameter, 85 mm bore and 54 mm width, envelope 85×105×54 mm. Mass is 935 g." }, { "q": "What does the RNA6915-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6915-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×105×54 mm and the catalogue ratings are C 147 kN, C0 275 kN, Cur 50 kN." }, { "q": "What is the load capacity of the RNA6915-ZW-XL?", "a": "The basic dynamic load rating C is 147 kN and the basic static load rating C0 is 275 kN; the fatigue load limit Cur is 50 kN." }, { "q": "What is the maximum speed of the RNA6915-ZW-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6915-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6915-ZW-XL has no inner ring, so the 85 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6915", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×105×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6915-ZW-XL", "RNA6915-ZW-XL" ], "locale_variants": {} }, { "sku": "NK90-25-XL", "brand": "FAG", "manufacturer_designation": "NK90/25-XL", "series": "nk-series", "type": "needle", "d_mm": 90, "D_mm": 110, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 81, "static_load_kN": 132, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 3400, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×110×25 mm: 90 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 81 kN and C0 132 kN at the 90 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 23.7 kN, the limiting speed 5,100 r/min and the thermal reference speed 3,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.90 kN/mm and per millimetre of width 3.24 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 450 g, just 0.16 g per mm² of projected 110×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 90 mm bore this is a heavy-industrial bearing: 450 g of stiff ring and roller set, specified where rigidity matters more than speed Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 90×110×25 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 110 mm outside diameter and 81 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 90 mm seat, and in planetary gear bearings the 450 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 25 mm width and the published 132 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK90/25-XL?", "a": "The NK90/25-XL is a NK machined-ring needle roller bearing without inner ring with 110 mm outside diameter, 90 mm bore and 25 mm width, envelope 90×110×25 mm. Mass is 450 g." }, { "q": "What does the NK90/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK90/25-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×110×25 mm and the catalogue ratings are C 81 kN, C0 132 kN, Cur 23.7 kN." }, { "q": "What is the load capacity of the NK90/25-XL?", "a": "The basic dynamic load rating C is 81 kN and the basic static load rating C0 is 132 kN; the fatigue load limit Cur is 23.7 kN." }, { "q": "What is the maximum speed of the NK90/25-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 3,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK90/25-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK90/25-XL has no inner ring, so the 90 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK90-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×110×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK90-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK90-25-XL", "NK90/25-XL" ], "locale_variants": {} }, { "sku": "NK90-35-XL", "brand": "FAG", "manufacturer_designation": "NK90/35-XL", "series": "nk-series", "type": "needle", "d_mm": 90, "D_mm": 110, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 116, "static_load_kN": 208, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 3250, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×110×35 mm: 90 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 116 kN and C0 208 kN at the 90 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 38 kN, the limiting speed 5,100 r/min and the thermal reference speed 3,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.29 kN/mm and per millimetre of width 3.31 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 630 g, just 0.16 g per mm² of projected 110×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 90 mm bore this is a heavy-industrial bearing: 630 g of stiff ring and roller set, specified where rigidity matters more than speed The hardness requirement is unforgiving: below about 58 HRC the 90 mm journal brinels under the 208 kN static rating, and roughness above raceway finish accelerates roller wear This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 5,100 r/min limit. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 110 mm outside diameter and 116 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 90 mm seat, and in textile machine heald and cam shafts the 630 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 35 mm width and the published 208 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK90/35-XL?", "a": "The NK90/35-XL is a NK machined-ring needle roller bearing without inner ring with 110 mm outside diameter, 90 mm bore and 35 mm width, envelope 90×110×35 mm. Mass is 630 g." }, { "q": "What does the NK90/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK90/35-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×110×35 mm and the catalogue ratings are C 116 kN, C0 208 kN, Cur 38 kN." }, { "q": "What is the load capacity of the NK90/35-XL?", "a": "The basic dynamic load rating C is 116 kN and the basic static load rating C0 is 208 kN; the fatigue load limit Cur is 38 kN." }, { "q": "What is the maximum speed of the NK90/35-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 3,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK90/35-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK90/35-XL has no inner ring, so the 90 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK90-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK90-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×110×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK90-35-XL", "NK90/35-XL" ], "locale_variants": {} }, { "sku": "RNA4916-XL", "brand": "FAG", "manufacturer_designation": "RNA4916-XL", "series": "rna49-series", "type": "needle", "d_mm": 90, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 101, "static_load_kN": 174, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 3000, "weight_g": 516, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×110×30 mm: 90 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 101 kN and C0 174 kN at the 90 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 31 kN, the limiting speed 5,100 r/min and the thermal reference speed 3,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.12 kN/mm and per millimetre of width 3.37 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 516 g, just 0.16 g per mm² of projected 110×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened With Cur 31 kN and a 5,100 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 90×110×30 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 110 mm outside diameter and 101 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 90 mm seat, and in planetary gear bearings the 516 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 174 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA4916-XL?", "a": "The RNA4916-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 110 mm outside diameter, 90 mm bore and 30 mm width, envelope 90×110×30 mm. Mass is 516 g." }, { "q": "What does the RNA4916-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4916-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×110×30 mm and the catalogue ratings are C 101 kN, C0 174 kN, Cur 31 kN." }, { "q": "What is the load capacity of the RNA4916-XL?", "a": "The basic dynamic load rating C is 101 kN and the basic static load rating C0 is 174 kN; the fatigue load limit Cur is 31 kN." }, { "q": "What is the maximum speed of the RNA4916-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 3,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4916-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4916-XL has no inner ring, so the 90 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4916", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×110×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4916-XL", "RNA4916-XL" ], "locale_variants": {} }, { "sku": "RNA6916-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6916-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 90, "D_mm": 110, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 153, "static_load_kN": 300, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 3050, "weight_g": 987, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×110×54 mm: 90 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 153 kN and C0 300 kN at the 90 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 54 kN, the limiting speed 5,100 r/min and the thermal reference speed 3,050 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.70 kN/mm and per millimetre of width 2.83 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 987 g, just 0.17 g per mm² of projected 110×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 90 mm bore the 110 mm outside diameter and 54 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,100 r/min With Cur 54 kN and a 5,100 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 90×110×54 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 54 mm width while the outside diameter stays a compact 110 mm. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 110 mm outside diameter and 153 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 90 mm seat, and in small electric motor accessory drives the 987 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 54 mm width and the published 300 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNA6916-ZW-XL?", "a": "The RNA6916-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 110 mm outside diameter, 90 mm bore and 54 mm width, envelope 90×110×54 mm. Mass is 987 g." }, { "q": "What does the RNA6916-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6916-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×110×54 mm and the catalogue ratings are C 153 kN, C0 300 kN, Cur 54 kN." }, { "q": "What is the load capacity of the RNA6916-ZW-XL?", "a": "The basic dynamic load rating C is 153 kN and the basic static load rating C0 is 300 kN; the fatigue load limit Cur is 54 kN." }, { "q": "What is the maximum speed of the RNA6916-ZW-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 3,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6916-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6916-ZW-XL has no inner ring, so the 90 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6916", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×110×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6916-ZW-XL", "RNA6916-ZW-XL" ], "locale_variants": {} }, { "sku": "NK95-26-XL", "brand": "FAG", "manufacturer_designation": "NK95/26-XL", "series": "nk-series", "type": "needle", "d_mm": 95, "D_mm": 115, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83, "static_load_kN": 137, "fatigue_load_limit_kN": 24.5, "limiting_speed_rpm": 4850, "max_rpm": 4850, "reference_speed_rpm": 3300, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×115×26 mm: 95 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 83 kN and C0 137 kN at the 95 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 115 mm outside diameter the fatigue load limit Cur is 24.5 kN, the limiting speed 4,850 r/min and the thermal reference speed 3,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.87 kN/mm and per millimetre of width 3.19 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 490 g, just 0.16 g per mm² of projected 115×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 95 mm bore this is a heavy-industrial bearing: 490 g of stiff ring and roller set, specified where rigidity matters more than speed The hardness requirement is unforgiving: below about 58 HRC the 95 mm journal brinels under the 137 kN static rating, and roughness above raceway finish accelerates roller wear Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 83 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 115 mm outside diameter and 83 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 95 mm seat, and in copying and printing machine mechanisms the 490 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 26 mm width and the published 137 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK95/26-XL?", "a": "The NK95/26-XL is a NK machined-ring needle roller bearing without inner ring with 115 mm outside diameter, 95 mm bore and 26 mm width, envelope 95×115×26 mm. Mass is 490 g." }, { "q": "What does the NK95/26-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK95/26-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×115×26 mm and the catalogue ratings are C 83 kN, C0 137 kN, Cur 24.5 kN." }, { "q": "What is the load capacity of the NK95/26-XL?", "a": "The basic dynamic load rating C is 83 kN and the basic static load rating C0 is 137 kN; the fatigue load limit Cur is 24.5 kN." }, { "q": "What is the maximum speed of the NK95/26-XL?", "a": "The limiting speed is 4,850 r/min and the thermal reference speed is 3,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK95/26-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK95/26-XL has no inner ring, so the 95 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK95-26", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×115×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK95-36", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK95-26-XL", "NK95/26-XL" ], "locale_variants": {} }, { "sku": "NK95-36-XL", "brand": "FAG", "manufacturer_designation": "NK95/36-XL", "series": "nk-series", "type": "needle", "d_mm": 95, "D_mm": 115, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 121, "static_load_kN": 223, "fatigue_load_limit_kN": 40.5, "limiting_speed_rpm": 4850, "max_rpm": 4850, "reference_speed_rpm": 3150, "weight_g": 680, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×115×36 mm: 95 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 121 kN and C0 223 kN at the 95 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 115 mm outside diameter the fatigue load limit Cur is 40.5 kN, the limiting speed 4,850 r/min and the thermal reference speed 3,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.27 kN/mm and per millimetre of width 3.36 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 680 g, just 0.16 g per mm² of projected 115×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 95 mm bore this is a heavy-industrial bearing: 680 g of stiff ring and roller set, specified where rigidity matters more than speed This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 95×115×36 mm envelope. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 115 mm outside diameter and 121 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 95 mm seat, and in motorcycle and light-vehicle transmissions the 680 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 36 mm width and the published 223 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NK95/36-XL?", "a": "The NK95/36-XL is a NK machined-ring needle roller bearing without inner ring with 115 mm outside diameter, 95 mm bore and 36 mm width, envelope 95×115×36 mm. Mass is 680 g." }, { "q": "What does the NK95/36-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK95/36-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×115×36 mm and the catalogue ratings are C 121 kN, C0 223 kN, Cur 40.5 kN." }, { "q": "What is the load capacity of the NK95/36-XL?", "a": "The basic dynamic load rating C is 121 kN and the basic static load rating C0 is 223 kN; the fatigue load limit Cur is 40.5 kN." }, { "q": "What is the maximum speed of the NK95/36-XL?", "a": "The limiting speed is 4,850 r/min and the thermal reference speed is 3,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK95/36-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK95/36-XL has no inner ring, so the 95 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK95-26", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK95-36", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×115×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=955", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK95-36-XL", "NK95/36-XL" ], "locale_variants": {} }, { "sku": "NK100-26-XL", "brand": "FAG", "manufacturer_designation": "NK100/26-XL", "series": "nk-series", "type": "needle", "d_mm": 100, "D_mm": 120, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 86, "static_load_kN": 146, "fatigue_load_limit_kN": 25.5, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 3150, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×120×26 mm: 100 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 86 kN and C0 146 kN at the 100 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 25.5 kN, the limiting speed 4,600 r/min and the thermal reference speed 3,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.86 kN/mm and per millimetre of width 3.31 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 515 g, just 0.17 g per mm² of projected 120×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 100 mm bore the 120 mm outside diameter and 26 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,600 r/min NK100/26-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 25.5 kN Cur value. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 120 mm outside diameter and 86 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 100 mm seat, and in planetary gear bearings the 515 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 26 mm width and the published 146 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK100/26-XL?", "a": "The NK100/26-XL is a NK machined-ring needle roller bearing without inner ring with 120 mm outside diameter, 100 mm bore and 26 mm width, envelope 100×120×26 mm. Mass is 515 g." }, { "q": "What does the NK100/26-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK100/26-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×120×26 mm and the catalogue ratings are C 86 kN, C0 146 kN, Cur 25.5 kN." }, { "q": "What is the load capacity of the NK100/26-XL?", "a": "The basic dynamic load rating C is 86 kN and the basic static load rating C0 is 146 kN; the fatigue load limit Cur is 25.5 kN." }, { "q": "What is the maximum speed of the NK100/26-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 3,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK100/26-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK100/26-XL has no inner ring, so the 100 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK100-26", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×120×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK100-36", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK100-26-XL", "NK100/26-XL" ], "locale_variants": {} }, { "sku": "NK100-36-XL", "brand": "FAG", "manufacturer_designation": "NK100/36-XL", "series": "nk-series", "type": "needle", "d_mm": 100, "D_mm": 120, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 125, "static_load_kN": 237, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 3000, "weight_g": 715, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×120×36 mm: 100 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 125 kN and C0 237 kN at the 100 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 42.5 kN, the limiting speed 4,600 r/min and the thermal reference speed 3,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.25 kN/mm and per millimetre of width 3.47 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 715 g, just 0.17 g per mm² of projected 120×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 100 mm bore the 120 mm outside diameter and 36 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,600 r/min Omitting the inner ring frees radial space — at a 100 mm shaft the outer diameter is only 120 mm and the width 36 mm, yet C is 125 kN The hardness requirement is unforgiving: below about 58 HRC the 100 mm journal brinels under the 237 kN static rating, and roughness above raceway finish accelerates roller wear As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 42.5 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 120 mm outside diameter and 125 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 100 mm seat, and in gearbox selector and change linkages the 715 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 36 mm width and the published 237 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK100/36-XL?", "a": "The NK100/36-XL is a NK machined-ring needle roller bearing without inner ring with 120 mm outside diameter, 100 mm bore and 36 mm width, envelope 100×120×36 mm. Mass is 715 g." }, { "q": "What does the NK100/36-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK100/36-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×120×36 mm and the catalogue ratings are C 125 kN, C0 237 kN, Cur 42.5 kN." }, { "q": "What is the load capacity of the NK100/36-XL?", "a": "The basic dynamic load rating C is 125 kN and the basic static load rating C0 is 237 kN; the fatigue load limit Cur is 42.5 kN." }, { "q": "What is the maximum speed of the NK100/36-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 3,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK100/36-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK100/36-XL has no inner ring, so the 100 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK100-26", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK100-36", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×120×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK100-36-XL", "NK100/36-XL" ], "locale_variants": {} }, { "sku": "RNA4917-XL", "brand": "FAG", "manufacturer_designation": "RNA4917-XL", "series": "rna49-series", "type": "needle", "d_mm": 100, "D_mm": 120, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 125, "static_load_kN": 237, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 2800, "weight_g": 657, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×120×35 mm: 100 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 125 kN and C0 237 kN at the 100 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 42.5 kN, the limiting speed 4,600 r/min and the thermal reference speed 2,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.25 kN/mm and per millimetre of width 3.57 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 657 g, just 0.16 g per mm² of projected 120×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 100 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Omitting the inner ring frees radial space — at a 100 mm shaft the outer diameter is only 120 mm and the width 35 mm, yet C is 125 kN With Cur 42.5 kN and a 4,600 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,600 r/min limit. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 120 mm outside diameter and 125 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 100 mm seat, and in motorcycle and light-vehicle transmissions the 657 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 35 mm width and the published 237 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4917-XL?", "a": "The RNA4917-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 120 mm outside diameter, 100 mm bore and 35 mm width, envelope 100×120×35 mm. Mass is 657 g." }, { "q": "What does the RNA4917-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4917-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×120×35 mm and the catalogue ratings are C 125 kN, C0 237 kN, Cur 42.5 kN." }, { "q": "What is the load capacity of the RNA4917-XL?", "a": "The basic dynamic load rating C is 125 kN and the basic static load rating C0 is 237 kN; the fatigue load limit Cur is 42.5 kN." }, { "q": "What is the maximum speed of the RNA4917-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 2,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4917-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4917-XL has no inner ring, so the 100 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4917", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×120×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4917-XL", "RNA4917-XL" ], "locale_variants": {} }, { "sku": "RNA6917-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6917-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 100, "D_mm": 120, "B_mm": 63, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 188, "static_load_kN": 400, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 2850, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×120×63 mm: 100 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 188 kN and C0 400 kN at the 100 mm seat; the C/C0 ratio of 0.47 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 72 kN, the limiting speed 4,600 r/min and the thermal reference speed 2,850 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.88 kN/mm and per millimetre of width 2.98 kN/mm — the reason 63 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.2 kg (1200 g), just 0.16 g per mm² of projected 120×63 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 100 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading the RNA69 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The thin 10.0 mm section makes the 1200 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 188 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 400 kN in this thin-section bearing — two rows support the static peak that a single row could not. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 120 mm outside diameter and 188 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 100 mm seat, and in agricultural machine pivots and linkages the 1.2 kg mass is part of the rotor inertia calculation. Designers also specify it for connecting-rod small ends, relying on the 63 mm width and the published 400 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA6917-ZW-XL?", "a": "The RNA6917-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 120 mm outside diameter, 100 mm bore and 63 mm width, envelope 100×120×63 mm. Mass is 1.2 kg." }, { "q": "What does the RNA6917-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6917-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×120×63 mm and the catalogue ratings are C 188 kN, C0 400 kN, Cur 72 kN." }, { "q": "What is the load capacity of the RNA6917-ZW-XL?", "a": "The basic dynamic load rating C is 188 kN and the basic static load rating C0 is 400 kN; the fatigue load limit Cur is 72 kN." }, { "q": "What is the maximum speed of the RNA6917-ZW-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 2,850 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6917-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6917-ZW-XL has no inner ring, so the 100 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6917", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×120×63 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6917-ZW-XL", "RNA6917-ZW-XL" ], "locale_variants": {} }, { "sku": "NK105-26-XL", "brand": "FAG", "manufacturer_designation": "NK105/26-XL", "series": "nk-series", "type": "needle", "d_mm": 105, "D_mm": 125, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 89, "static_load_kN": 155, "fatigue_load_limit_kN": 27, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 3050, "weight_g": 540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 105×125×26 mm: 105 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 89 kN and C0 155 kN at the 105 mm seat; the C/C0 ratio of 0.57 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 27 kN, the limiting speed 4,400 r/min and the thermal reference speed 3,050 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.85 kN/mm and per millimetre of width 3.42 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 540 g, just 0.17 g per mm² of projected 125×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 105 mm bore the 125 mm outside diameter and 26 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,400 r/min Reading the NK prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened NK105/26-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,400 r/min limit. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 125 mm outside diameter and 89 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 105 mm seat, and in connecting-rod small ends the 540 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 26 mm width and the published 155 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NK105/26-XL?", "a": "The NK105/26-XL is a NK machined-ring needle roller bearing without inner ring with 125 mm outside diameter, 105 mm bore and 26 mm width, envelope 105×125×26 mm. Mass is 540 g." }, { "q": "What does the NK105/26-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK105/26-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 105×125×26 mm and the catalogue ratings are C 89 kN, C0 155 kN, Cur 27 kN." }, { "q": "What is the load capacity of the NK105/26-XL?", "a": "The basic dynamic load rating C is 89 kN and the basic static load rating C0 is 155 kN; the fatigue load limit Cur is 27 kN." }, { "q": "What is the maximum speed of the NK105/26-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 3,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK105/26-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK105/26-XL has no inner ring, so the 105 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK105-26", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×125×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK105-36", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK105-26-XL", "NK105/26-XL" ], "locale_variants": {} }, { "sku": "NK105-36-XL", "brand": "FAG", "manufacturer_designation": "NK105/36-XL", "series": "nk-series", "type": "needle", "d_mm": 105, "D_mm": 125, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 129, "static_load_kN": 250, "fatigue_load_limit_kN": 44.5, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 2850, "weight_g": 713, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 105×125×36 mm: 105 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 129 kN and C0 250 kN at the 105 mm seat; the C/C0 ratio of 0.52 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 44.5 kN, the limiting speed 4,400 r/min and the thermal reference speed 2,850 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.23 kN/mm and per millimetre of width 3.58 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 713 g, just 0.16 g per mm² of projected 125×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 105 mm bore the 125 mm outside diameter and 36 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,400 r/min Omitting the inner ring frees radial space — at a 105 mm shaft the outer diameter is only 125 mm and the width 36 mm, yet C is 129 kN With Cur 44.5 kN and a 4,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins X-life status (-XL) indicates the current Schaeffler premium execution at 105 mm bore; the 250 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 125 mm outside diameter and 129 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 105 mm seat, and in planetary gear bearings the 713 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 36 mm width and the published 250 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK105/36-XL?", "a": "The NK105/36-XL is a NK machined-ring needle roller bearing without inner ring with 125 mm outside diameter, 105 mm bore and 36 mm width, envelope 105×125×36 mm. Mass is 713 g." }, { "q": "What does the NK105/36-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK105/36-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 105×125×36 mm and the catalogue ratings are C 129 kN, C0 250 kN, Cur 44.5 kN." }, { "q": "What is the load capacity of the NK105/36-XL?", "a": "The basic dynamic load rating C is 129 kN and the basic static load rating C0 is 250 kN; the fatigue load limit Cur is 44.5 kN." }, { "q": "What is the maximum speed of the NK105/36-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 2,850 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK105/36-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK105/36-XL has no inner ring, so the 105 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK105-26", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK105-36", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×125×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK105-36-XL", "NK105/36-XL" ], "locale_variants": {} }, { "sku": "RNA4918-XL", "brand": "FAG", "manufacturer_designation": "RNA4918-XL", "series": "rna49-series", "type": "needle", "d_mm": 105, "D_mm": 125, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 129, "static_load_kN": 250, "fatigue_load_limit_kN": 44.5, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 2650, "weight_g": 745, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 105×125×35 mm: 105 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 129 kN and C0 250 kN at the 105 mm seat; the C/C0 ratio of 0.52 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 44.5 kN, the limiting speed 4,400 r/min and the thermal reference speed 2,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.23 kN/mm and per millimetre of width 3.69 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 745 g, just 0.17 g per mm² of projected 125×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 105 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery With Cur 44.5 kN and a 4,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,400 r/min limit. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 125 mm outside diameter and 129 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 105 mm seat, and in small electric motor accessory drives the 745 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 35 mm width and the published 250 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4918-XL?", "a": "The RNA4918-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 125 mm outside diameter, 105 mm bore and 35 mm width, envelope 105×125×35 mm. Mass is 745 g." }, { "q": "What does the RNA4918-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4918-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 105×125×35 mm and the catalogue ratings are C 129 kN, C0 250 kN, Cur 44.5 kN." }, { "q": "What is the load capacity of the RNA4918-XL?", "a": "The basic dynamic load rating C is 129 kN and the basic static load rating C0 is 250 kN; the fatigue load limit Cur is 44.5 kN." }, { "q": "What is the maximum speed of the RNA4918-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 2,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4918-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4918-XL has no inner ring, so the 105 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4918", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×125×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4918-XL", "RNA4918-XL" ], "locale_variants": {} }, { "sku": "RNA6918-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6918-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 105, "D_mm": 125, "B_mm": 63, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 425, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 2700, "weight_g": 1330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 105×125×63 mm: 105 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 195 kN and C0 425 kN at the 105 mm seat; the C/C0 ratio of 0.46 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 76 kN, the limiting speed 4,400 r/min and the thermal reference speed 2,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.86 kN/mm and per millimetre of width 3.10 kN/mm — the reason 63 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.33 kg (1330 g), just 0.17 g per mm² of projected 125×63 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 105 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading the RNA69 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 195 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 425 kN in this thin-section bearing — two rows support the static peak that a single row could not. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 125 mm outside diameter and 195 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 105 mm seat, and in hydraulic and pneumatic pump eccentrics the 1.33 kg mass is part of the rotor inertia calculation. Designers also specify it for textile machine heald and cam shafts, relying on the 63 mm width and the published 425 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA6918-ZW-XL?", "a": "The RNA6918-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 125 mm outside diameter, 105 mm bore and 63 mm width, envelope 105×125×63 mm. Mass is 1.33 kg." }, { "q": "What does the RNA6918-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6918-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 105×125×63 mm and the catalogue ratings are C 195 kN, C0 425 kN, Cur 76 kN." }, { "q": "What is the load capacity of the RNA6918-ZW-XL?", "a": "The basic dynamic load rating C is 195 kN and the basic static load rating C0 is 425 kN; the fatigue load limit Cur is 76 kN." }, { "q": "What is the maximum speed of the RNA6918-ZW-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 2,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6918-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6918-ZW-XL has no inner ring, so the 105 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6918", "equiv_brand": "SKF", "level": "partial", "note": "Same 105×125×63 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6918-ZW-XL", "RNA6918-ZW-XL" ], "locale_variants": {} }, { "sku": "NK110-30-XL", "brand": "FAG", "manufacturer_designation": "NK110/30-XL", "series": "nk-series", "type": "needle", "d_mm": 110, "D_mm": 130, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 111, "static_load_kN": 210, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2800, "weight_g": 650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×130×30 mm: 110 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 111 kN and C0 210 kN at the 110 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 36 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 3.70 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 650 g, just 0.17 g per mm² of projected 130×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 110 mm bore the 130 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,200 r/min The thin 10.0 mm section makes the 650 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Omitting the inner ring frees radial space — at a 110 mm shaft the outer diameter is only 130 mm and the width 30 mm, yet C is 111 kN X-life status (-XL) indicates the current Schaeffler premium execution at 110 mm bore; the 210 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 130 mm outside diameter and 111 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 110 mm seat, and in planetary gear bearings the 650 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 210 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NK110/30-XL?", "a": "The NK110/30-XL is a NK machined-ring needle roller bearing without inner ring with 130 mm outside diameter, 110 mm bore and 30 mm width, envelope 110×130×30 mm. Mass is 650 g." }, { "q": "What does the NK110/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK110/30-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×130×30 mm and the catalogue ratings are C 111 kN, C0 210 kN, Cur 36 kN." }, { "q": "What is the load capacity of the NK110/30-XL?", "a": "The basic dynamic load rating C is 111 kN and the basic static load rating C0 is 210 kN; the fatigue load limit Cur is 36 kN." }, { "q": "What is the maximum speed of the NK110/30-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK110/30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK110/30-XL has no inner ring, so the 110 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK110-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×130×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NK110-40", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK110-30-XL", "NK110/30-XL" ], "locale_variants": {} }, { "sku": "NK110-40-XL", "brand": "FAG", "manufacturer_designation": "NK110/40-XL", "series": "nk-series", "type": "needle", "d_mm": 110, "D_mm": 130, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 143, "static_load_kN": 290, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2750, "weight_g": 830, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×130×40 mm: 110 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 143 kN and C0 290 kN at the 110 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 51 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,750 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.30 kN/mm and per millimetre of width 3.58 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 830 g, just 0.16 g per mm² of projected 130×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 110 mm bore the 130 mm outside diameter and 40 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,200 r/min With Cur 51 kN and a 4,200 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The thin 10.0 mm section makes the 830 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 51 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 130 mm outside diameter and 143 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 110 mm seat, and in textile machine heald and cam shafts the 830 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 40 mm width and the published 290 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NK110/40-XL?", "a": "The NK110/40-XL is a NK machined-ring needle roller bearing without inner ring with 130 mm outside diameter, 110 mm bore and 40 mm width, envelope 110×130×40 mm. Mass is 830 g." }, { "q": "What does the NK110/40-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NK110/40-XL identifies this NK machined-ring needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×130×40 mm and the catalogue ratings are C 143 kN, C0 290 kN, Cur 51 kN." }, { "q": "What is the load capacity of the NK110/40-XL?", "a": "The basic dynamic load rating C is 143 kN and the basic static load rating C0 is 290 kN; the fatigue load limit Cur is 51 kN." }, { "q": "What is the maximum speed of the NK110/40-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the NK110/40-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The NK110/40-XL has no inner ring, so the 110 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "NK110-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NK110-40", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×130×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NK110-40-XL", "NK110/40-XL" ], "locale_variants": {} }, { "sku": "RNA4919-XL", "brand": "FAG", "manufacturer_designation": "RNA4919-XL", "series": "rna49-series", "type": "needle", "d_mm": 110, "D_mm": 130, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 131, "static_load_kN": 260, "fatigue_load_limit_kN": 45, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2500, "weight_g": 719, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×130×35 mm: 110 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 131 kN and C0 260 kN at the 110 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 45 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.19 kN/mm and per millimetre of width 3.74 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 719 g, just 0.16 g per mm² of projected 130×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 110 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The thin 10.0 mm section makes the 719 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting RNA4919-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,200 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 130 mm outside diameter and 131 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 110 mm seat, and in copying and printing machine mechanisms the 719 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 35 mm width and the published 260 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4919-XL?", "a": "The RNA4919-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 130 mm outside diameter, 110 mm bore and 35 mm width, envelope 110×130×35 mm. Mass is 719 g." }, { "q": "What does the RNA4919-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4919-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×130×35 mm and the catalogue ratings are C 131 kN, C0 260 kN, Cur 45 kN." }, { "q": "What is the load capacity of the RNA4919-XL?", "a": "The basic dynamic load rating C is 131 kN and the basic static load rating C0 is 260 kN; the fatigue load limit Cur is 45 kN." }, { "q": "What is the maximum speed of the RNA4919-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4919-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4919-XL has no inner ring, so the 110 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4919", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×130×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4919-XL", "RNA4919-XL" ], "locale_variants": {} }, { "sku": "RNA6919-ZW-XL", "brand": "FAG", "manufacturer_designation": "RNA6919-ZW-XL", "series": "rna69-series", "type": "needle", "d_mm": 110, "D_mm": 130, "B_mm": 63, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 197, "static_load_kN": 440, "fatigue_load_limit_kN": 77, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2550, "weight_g": 1460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×130×63 mm: 110 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 197 kN and C0 440 kN at the 110 mm seat; the C/C0 ratio of 0.45 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 77 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,550 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.79 kN/mm and per millimetre of width 3.13 kN/mm — the reason 63 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.46 kg (1460 g), just 0.18 g per mm² of projected 130×63 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 110 mm bore this is a heavy-industrial bearing: 1.46 kg of stiff ring and roller set, specified where rigidity matters more than speed Omitting the inner ring frees radial space — at a 110 mm shaft the outer diameter is only 130 mm and the width 63 mm, yet C is 197 kN This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 197 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 440 kN in this thin-section bearing — two rows support the static peak that a single row could not. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 130 mm outside diameter and 197 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 110 mm seat, and in gearbox selector and change linkages the 1.46 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 63 mm width and the published 440 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA6919-ZW-XL?", "a": "The RNA6919-ZW-XL is a RNA69 double-row dimension-series 69 needle roller bearing without inner ring with 130 mm outside diameter, 110 mm bore and 63 mm width, envelope 110×130×63 mm. Mass is 1.46 kg." }, { "q": "What does the RNA6919-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA6919-ZW-XL identifies this RNA69 double-row dimension-series 69 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×130×63 mm and the catalogue ratings are C 197 kN, C0 440 kN, Cur 77 kN." }, { "q": "What is the load capacity of the RNA6919-ZW-XL?", "a": "The basic dynamic load rating C is 197 kN and the basic static load rating C0 is 440 kN; the fatigue load limit Cur is 77 kN." }, { "q": "What is the maximum speed of the RNA6919-ZW-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA6919-ZW-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA6919-ZW-XL has no inner ring, so the 110 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA6919", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×130×63 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA6919-ZW-XL", "RNA6919-ZW-XL" ], "locale_variants": {} }, { "sku": "RNA4920-XL", "brand": "FAG", "manufacturer_designation": "RNA4920-XL", "series": "rna49-series", "type": "needle", "d_mm": 115, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 144, "static_load_kN": 270, "fatigue_load_limit_kN": 46, "limiting_speed_rpm": 4000, "max_rpm": 4000, "reference_speed_rpm": 2650, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 115×140×40 mm: 115 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 144 kN and C0 270 kN at the 115 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 140 mm outside diameter the fatigue load limit Cur is 46 kN, the limiting speed 4,000 r/min and the thermal reference speed 2,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.25 kN/mm and per millimetre of width 3.60 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.15 kg (1150 g), just 0.21 g per mm² of projected 140×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 115 mm bore the 140 mm outside diameter and 40 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,000 r/min The thin 12.5 mm section makes the 1150 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting With Cur 46 kN and a 4,000 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 144 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 140 mm outside diameter and 144 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 115 mm seat, and in copying and printing machine mechanisms the 1.15 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural machine pivots and linkages, relying on the 40 mm width and the published 270 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA4920-XL?", "a": "The RNA4920-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 140 mm outside diameter, 115 mm bore and 40 mm width, envelope 115×140×40 mm. Mass is 1.15 kg." }, { "q": "What does the RNA4920-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4920-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 115×140×40 mm and the catalogue ratings are C 144 kN, C0 270 kN, Cur 46 kN." }, { "q": "What is the load capacity of the RNA4920-XL?", "a": "The basic dynamic load rating C is 144 kN and the basic static load rating C0 is 270 kN; the fatigue load limit Cur is 46 kN." }, { "q": "What is the maximum speed of the RNA4920-XL?", "a": "The limiting speed is 4,000 r/min and the thermal reference speed is 2,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4920-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4920-XL has no inner ring, so the 115 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4920", "equiv_brand": "SKF", "level": "partial", "note": "Same 115×140×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4920-XL", "RNA4920-XL" ], "locale_variants": {} }, { "sku": "RNA4822-XL", "brand": "FAG", "manufacturer_designation": "RNA4822-XL", "series": "rna48-series", "type": "needle", "d_mm": 120, "D_mm": 140, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 216, "fatigue_load_limit_kN": 36.5, "limiting_speed_rpm": 3900, "max_rpm": 3900, "reference_speed_rpm": 2340, "weight_g": 670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×140×30 mm: 120 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 106 kN and C0 216 kN at the 120 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 140 mm outside diameter the fatigue load limit Cur is 36.5 kN, the limiting speed 3,900 r/min and the thermal reference speed 2,340 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 3.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 670 g, just 0.16 g per mm² of projected 140×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 120 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The hardness requirement is unforgiving: below about 58 HRC the 120 mm journal brinels under the 216 kN static rating, and roughness above raceway finish accelerates roller wear RNA4822-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality X-life status (-XL) indicates the current Schaeffler premium execution at 120 mm bore; the 216 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 140 mm outside diameter and 106 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 120 mm seat, and in gearbox selector and change linkages the 670 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 216 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4822-XL?", "a": "The RNA4822-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 140 mm outside diameter, 120 mm bore and 30 mm width, envelope 120×140×30 mm. Mass is 670 g." }, { "q": "What does the RNA4822-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4822-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 120×140×30 mm and the catalogue ratings are C 106 kN, C0 216 kN, Cur 36.5 kN." }, { "q": "What is the load capacity of the RNA4822-XL?", "a": "The basic dynamic load rating C is 106 kN and the basic static load rating C0 is 216 kN; the fatigue load limit Cur is 36.5 kN." }, { "q": "What is the maximum speed of the RNA4822-XL?", "a": "The limiting speed is 3,900 r/min and the thermal reference speed is 2,340 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4822-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4822-XL has no inner ring, so the 120 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4822", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×140×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4822-XL", "RNA4822-XL" ], "locale_variants": {} }, { "sku": "RNA4922-XL", "brand": "FAG", "manufacturer_designation": "RNA4922-XL", "series": "rna49-series", "type": "needle", "d_mm": 125, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 149, "static_load_kN": 290, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 3700, "max_rpm": 3700, "reference_speed_rpm": 2430, "weight_g": 1240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 125×150×40 mm: 125 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 149 kN and C0 290 kN at the 125 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 150 mm outside diameter the fatigue load limit Cur is 48 kN, the limiting speed 3,700 r/min and the thermal reference speed 2,430 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.19 kN/mm and per millimetre of width 3.73 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.24 kg (1240 g), just 0.21 g per mm² of projected 150×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 125 mm bore this is among the largest catalogue sizes; the 3,700 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 125×150×40 mm envelope. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 150 mm outside diameter and 149 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 125 mm seat, and in gearbox selector and change linkages the 1.24 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 40 mm width and the published 290 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNA4922-XL?", "a": "The RNA4922-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 150 mm outside diameter, 125 mm bore and 40 mm width, envelope 125×150×40 mm. Mass is 1.24 kg." }, { "q": "What does the RNA4922-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4922-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 125×150×40 mm and the catalogue ratings are C 149 kN, C0 290 kN, Cur 48 kN." }, { "q": "What is the load capacity of the RNA4922-XL?", "a": "The basic dynamic load rating C is 149 kN and the basic static load rating C0 is 290 kN; the fatigue load limit Cur is 48 kN." }, { "q": "What is the maximum speed of the RNA4922-XL?", "a": "The limiting speed is 3,700 r/min and the thermal reference speed is 2,430 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4922-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4922-XL has no inner ring, so the 125 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4922", "equiv_brand": "SKF", "level": "partial", "note": "Same 125×150×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4922-XL", "RNA4922-XL" ], "locale_variants": {} }, { "sku": "RNA4824-XL", "brand": "FAG", "manufacturer_designation": "RNA4824-XL", "series": "rna48-series", "type": "needle", "d_mm": 130, "D_mm": 150, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 112, "static_load_kN": 239, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "reference_speed_rpm": 2120, "weight_g": 730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×150×30 mm: 130 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 112 kN and C0 239 kN at the 130 mm seat; the C/C0 ratio of 0.47 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 150 mm outside diameter the fatigue load limit Cur is 39.5 kN, the limiting speed 3,600 r/min and the thermal reference speed 2,120 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.86 kN/mm and per millimetre of width 3.73 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 730 g, just 0.16 g per mm² of projected 150×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 130 mm bore, 150 mm outside diameter: at this size the 239 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Omitting the inner ring frees radial space — at a 130 mm shaft the outer diameter is only 150 mm and the width 30 mm, yet C is 112 kN Reading the RNA48 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened X-life status (-XL) indicates the current Schaeffler premium execution at 130 mm bore; the 239 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 150 mm outside diameter and 112 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 130 mm seat, and in connecting-rod small ends the 730 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 239 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNA4824-XL?", "a": "The RNA4824-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 150 mm outside diameter, 130 mm bore and 30 mm width, envelope 130×150×30 mm. Mass is 730 g." }, { "q": "What does the RNA4824-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4824-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 130×150×30 mm and the catalogue ratings are C 112 kN, C0 239 kN, Cur 39.5 kN." }, { "q": "What is the load capacity of the RNA4824-XL?", "a": "The basic dynamic load rating C is 112 kN and the basic static load rating C0 is 239 kN; the fatigue load limit Cur is 39.5 kN." }, { "q": "What is the maximum speed of the RNA4824-XL?", "a": "The limiting speed is 3,600 r/min and the thermal reference speed is 2,120 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4824-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4824-XL has no inner ring, so the 130 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4824", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×150×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4824-XL", "RNA4824-XL" ], "locale_variants": {} }, { "sku": "RNA4924-XL", "brand": "FAG", "manufacturer_designation": "RNA4924-XL", "series": "rna49-series", "type": "needle", "d_mm": 135, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 205, "static_load_kN": 390, "fatigue_load_limit_kN": 65, "limiting_speed_rpm": 3400, "max_rpm": 3400, "reference_speed_rpm": 2250, "weight_g": 1860, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 135×165×45 mm: 135 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 205 kN and C0 390 kN at the 135 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 165 mm outside diameter the fatigue load limit Cur is 65 kN, the limiting speed 3,400 r/min and the thermal reference speed 2,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.52 kN/mm and per millimetre of width 4.56 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.86 kg (1860 g), just 0.25 g per mm² of projected 165×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 135 mm bore puts this execution at the top of the HR1 range — the 165 mm outside diameter, 45 mm width and 1.86 kg mass are built for primary-industry load cases The thin 15.0 mm section makes the 1860 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting With Cur 65 kN and a 3,400 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 135×165×45 mm envelope. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 165 mm outside diameter and 205 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 135 mm seat, and in connecting-rod small ends the 1.86 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 45 mm width and the published 390 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA4924-XL?", "a": "The RNA4924-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 165 mm outside diameter, 135 mm bore and 45 mm width, envelope 135×165×45 mm. Mass is 1.86 kg." }, { "q": "What does the RNA4924-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4924-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 135×165×45 mm and the catalogue ratings are C 205 kN, C0 390 kN, Cur 65 kN." }, { "q": "What is the load capacity of the RNA4924-XL?", "a": "The basic dynamic load rating C is 205 kN and the basic static load rating C0 is 390 kN; the fatigue load limit Cur is 65 kN." }, { "q": "What is the maximum speed of the RNA4924-XL?", "a": "The limiting speed is 3,400 r/min and the thermal reference speed is 2,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4924-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4924-XL has no inner ring, so the 135 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4924", "equiv_brand": "SKF", "level": "partial", "note": "Same 135×165×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4924-XL", "RNA4924-XL" ], "locale_variants": {} }, { "sku": "RNA4826-XL", "brand": "FAG", "manufacturer_designation": "RNA4826-XL", "series": "rna48-series", "type": "needle", "d_mm": 145, "D_mm": 165, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 310, "fatigue_load_limit_kN": 49.5, "limiting_speed_rpm": 3250, "max_rpm": 3250, "reference_speed_rpm": 2000, "weight_g": 990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 145×165×35 mm: 145 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 134 kN and C0 310 kN at the 145 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 165 mm outside diameter the fatigue load limit Cur is 49.5 kN, the limiting speed 3,250 r/min and the thermal reference speed 2,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 3.83 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 990 g, just 0.17 g per mm² of projected 165×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 145 mm bore, 165 mm outside diameter: at this size the 310 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces Omitting the inner ring frees radial space — at a 145 mm shaft the outer diameter is only 165 mm and the width 35 mm, yet C is 134 kN As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 49.5 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 165 mm outside diameter and 134 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 145 mm seat, and in textile machine heald and cam shafts the 990 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 35 mm width and the published 310 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4826-XL?", "a": "The RNA4826-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 165 mm outside diameter, 145 mm bore and 35 mm width, envelope 145×165×35 mm. Mass is 990 g." }, { "q": "What does the RNA4826-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4826-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 145×165×35 mm and the catalogue ratings are C 134 kN, C0 310 kN, Cur 49.5 kN." }, { "q": "What is the load capacity of the RNA4826-XL?", "a": "The basic dynamic load rating C is 134 kN and the basic static load rating C0 is 310 kN; the fatigue load limit Cur is 49.5 kN." }, { "q": "What is the maximum speed of the RNA4826-XL?", "a": "The limiting speed is 3,250 r/min and the thermal reference speed is 2,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4826-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4826-XL has no inner ring, so the 145 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4826", "equiv_brand": "SKF", "level": "partial", "note": "Same 145×165×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4826-XL", "RNA4826-XL" ], "locale_variants": {} }, { "sku": "RNA4926-XL", "brand": "FAG", "manufacturer_designation": "RNA4926-XL", "series": "rna49-series", "type": "needle", "d_mm": 150, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 229, "static_load_kN": 470, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 3100, "max_rpm": 3100, "reference_speed_rpm": 2080, "weight_g": 2210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×180×50 mm: 150 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 229 kN and C0 470 kN at the 150 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 180 mm outside diameter the fatigue load limit Cur is 76 kN, the limiting speed 3,100 r/min and the thermal reference speed 2,080 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.53 kN/mm and per millimetre of width 4.58 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.21 kg (2210 g), just 0.25 g per mm² of projected 180×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 150 mm bore puts this execution at the top of the HR1 range — the 180 mm outside diameter, 50 mm width and 2.21 kg mass are built for primary-industry load cases RNA4926-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,100 r/min limit. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 180 mm outside diameter and 229 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 150 mm seat, and in textile machine heald and cam shafts the 2.21 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 50 mm width and the published 470 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNA4926-XL?", "a": "The RNA4926-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 180 mm outside diameter, 150 mm bore and 50 mm width, envelope 150×180×50 mm. Mass is 2.21 kg." }, { "q": "What does the RNA4926-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4926-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 150×180×50 mm and the catalogue ratings are C 229 kN, C0 470 kN, Cur 76 kN." }, { "q": "What is the load capacity of the RNA4926-XL?", "a": "The basic dynamic load rating C is 229 kN and the basic static load rating C0 is 470 kN; the fatigue load limit Cur is 76 kN." }, { "q": "What is the maximum speed of the RNA4926-XL?", "a": "The limiting speed is 3,100 r/min and the thermal reference speed is 2,080 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4926-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4926-XL has no inner ring, so the 150 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4926", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×180×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4926-XL", "RNA4926-XL" ], "locale_variants": {} }, { "sku": "RNA4828-XL", "brand": "FAG", "manufacturer_designation": "RNA4828-XL", "series": "rna48-series", "type": "needle", "d_mm": 155, "D_mm": 175, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 136, "static_load_kN": 325, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 3050, "max_rpm": 3050, "reference_speed_rpm": 1870, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 155×175×35 mm: 155 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 136 kN and C0 325 kN at the 155 mm seat; the C/C0 ratio of 0.42 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 175 mm outside diameter the fatigue load limit Cur is 51 kN, the limiting speed 3,050 r/min and the thermal reference speed 1,870 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 3.89 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.05 kg (1050 g), just 0.17 g per mm² of projected 175×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 155 mm bore, 175 mm outside diameter: at this size the 325 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 136 kN C rating and longer nominal life come without an envelope change. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 175 mm outside diameter and 136 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 155 mm seat, and in agricultural machine pivots and linkages the 1.05 kg mass is part of the rotor inertia calculation. Designers also specify it for connecting-rod small ends, relying on the 35 mm width and the published 325 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4828-XL?", "a": "The RNA4828-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 175 mm outside diameter, 155 mm bore and 35 mm width, envelope 155×175×35 mm. Mass is 1.05 kg." }, { "q": "What does the RNA4828-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4828-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 155×175×35 mm and the catalogue ratings are C 136 kN, C0 325 kN, Cur 51 kN." }, { "q": "What is the load capacity of the RNA4828-XL?", "a": "The basic dynamic load rating C is 136 kN and the basic static load rating C0 is 325 kN; the fatigue load limit Cur is 51 kN." }, { "q": "What is the maximum speed of the RNA4828-XL?", "a": "The limiting speed is 3,050 r/min and the thermal reference speed is 1,870 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4828-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4828-XL has no inner ring, so the 155 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4828", "equiv_brand": "SKF", "level": "partial", "note": "Same 155×175×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4828-XL", "RNA4828-XL" ], "locale_variants": {} }, { "sku": "RNA4928-XL", "brand": "FAG", "manufacturer_designation": "RNA4928-XL", "series": "rna49-series", "type": "needle", "d_mm": 160, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 237, "static_load_kN": 500, "fatigue_load_limit_kN": 79, "limiting_speed_rpm": 2900, "max_rpm": 2900, "reference_speed_rpm": 1910, "weight_g": 2350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×190×50 mm: 160 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 237 kN and C0 500 kN at the 160 mm seat; the C/C0 ratio of 0.47 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 190 mm outside diameter the fatigue load limit Cur is 79 kN, the limiting speed 2,900 r/min and the thermal reference speed 1,910 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.48 kN/mm and per millimetre of width 4.74 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.35 kg (2350 g), just 0.25 g per mm² of projected 190×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 160 mm bore puts this execution at the top of the HR1 range — the 190 mm outside diameter, 50 mm width and 2.35 kg mass are built for primary-industry load cases Reading the RNA49 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened RNA4928-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality X-life status (-XL) indicates the current Schaeffler premium execution at 160 mm bore; the 500 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 190 mm outside diameter and 237 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 160 mm seat, and in agricultural machine pivots and linkages the 2.35 kg mass is part of the rotor inertia calculation. Designers also specify it for connecting-rod small ends, relying on the 50 mm width and the published 500 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4928-XL?", "a": "The RNA4928-XL is a RNA49 dimension-series 49 needle roller bearing without inner ring with 190 mm outside diameter, 160 mm bore and 50 mm width, envelope 160×190×50 mm. Mass is 2.35 kg." }, { "q": "What does the RNA4928-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4928-XL identifies this RNA49 dimension-series 49 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 160×190×50 mm and the catalogue ratings are C 237 kN, C0 500 kN, Cur 79 kN." }, { "q": "What is the load capacity of the RNA4928-XL?", "a": "The basic dynamic load rating C is 237 kN and the basic static load rating C0 is 500 kN; the fatigue load limit Cur is 79 kN." }, { "q": "What is the maximum speed of the RNA4928-XL?", "a": "The limiting speed is 2,900 r/min and the thermal reference speed is 1,910 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4928-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4928-XL has no inner ring, so the 160 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4928", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×190×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4928-XL", "RNA4928-XL" ], "locale_variants": {} }, { "sku": "RNA4830-XL", "brand": "FAG", "manufacturer_designation": "RNA4830-XL", "series": "rna48-series", "type": "needle", "d_mm": 165, "D_mm": 190, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 172, "static_load_kN": 400, "fatigue_load_limit_kN": 63, "limiting_speed_rpm": 2850, "max_rpm": 2850, "reference_speed_rpm": 1830, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 165×190×40 mm: 165 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 172 kN and C0 400 kN at the 165 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 190 mm outside diameter the fatigue load limit Cur is 63 kN, the limiting speed 2,850 r/min and the thermal reference speed 1,830 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.04 kN/mm and per millimetre of width 4.30 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.6 kg (1600 g), just 0.21 g per mm² of projected 190×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 165 mm bore puts this execution at the top of the HR1 range — the 190 mm outside diameter, 40 mm width and 1.6 kg mass are built for primary-industry load cases This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces X-life status (-XL) indicates the current Schaeffler premium execution at 165 mm bore; the 400 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 190 mm outside diameter and 172 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 165 mm seat, and in motorcycle and light-vehicle transmissions the 1.6 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 40 mm width and the published 400 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4830-XL?", "a": "The RNA4830-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 190 mm outside diameter, 165 mm bore and 40 mm width, envelope 165×190×40 mm. Mass is 1.6 kg." }, { "q": "What does the RNA4830-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4830-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 165×190×40 mm and the catalogue ratings are C 172 kN, C0 400 kN, Cur 63 kN." }, { "q": "What is the load capacity of the RNA4830-XL?", "a": "The basic dynamic load rating C is 172 kN and the basic static load rating C0 is 400 kN; the fatigue load limit Cur is 63 kN." }, { "q": "What is the maximum speed of the RNA4830-XL?", "a": "The limiting speed is 2,850 r/min and the thermal reference speed is 1,830 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4830-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4830-XL has no inner ring, so the 165 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4830", "equiv_brand": "SKF", "level": "partial", "note": "Same 165×190×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4830-XL", "RNA4830-XL" ], "locale_variants": {} }, { "sku": "RNA4832-XL", "brand": "FAG", "manufacturer_designation": "RNA4832-XL", "series": "rna48-series", "type": "needle", "d_mm": 175, "D_mm": 200, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 181, "static_load_kN": 435, "fatigue_load_limit_kN": 67, "limiting_speed_rpm": 2700, "max_rpm": 2700, "reference_speed_rpm": 1700, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 175×200×40 mm: 175 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 181 kN and C0 435 kN at the 175 mm seat; the C/C0 ratio of 0.42 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 200 mm outside diameter the fatigue load limit Cur is 67 kN, the limiting speed 2,700 r/min and the thermal reference speed 1,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 4.53 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.7 kg (1700 g), just 0.21 g per mm² of projected 200×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 175 mm bore puts this execution at the top of the HR1 range — the 200 mm outside diameter, 40 mm width and 1.7 kg mass are built for primary-industry load cases The thin 12.5 mm section makes the 1700 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting Reading the RNA48 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 67 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 200 mm outside diameter and 181 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 175 mm seat, and in connecting-rod small ends the 1.7 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 40 mm width and the published 435 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNA4832-XL?", "a": "The RNA4832-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 200 mm outside diameter, 175 mm bore and 40 mm width, envelope 175×200×40 mm. Mass is 1.7 kg." }, { "q": "What does the RNA4832-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4832-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 175×200×40 mm and the catalogue ratings are C 181 kN, C0 435 kN, Cur 67 kN." }, { "q": "What is the load capacity of the RNA4832-XL?", "a": "The basic dynamic load rating C is 181 kN and the basic static load rating C0 is 435 kN; the fatigue load limit Cur is 67 kN." }, { "q": "What is the maximum speed of the RNA4832-XL?", "a": "The limiting speed is 2,700 r/min and the thermal reference speed is 1,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4832-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4832-XL has no inner ring, so the 175 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4832", "equiv_brand": "SKF", "level": "partial", "note": "Same 175×200×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4832-XL", "RNA4832-XL" ], "locale_variants": {} }, { "sku": "RNA4834-XL", "brand": "FAG", "manufacturer_designation": "RNA4834-XL", "series": "rna48-series", "type": "needle", "d_mm": 185, "D_mm": 215, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 209, "static_load_kN": 510, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2550, "max_rpm": 2550, "reference_speed_rpm": 1640, "weight_g": 2540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 185×215×45 mm: 185 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 209 kN and C0 510 kN at the 185 mm seat; the C/C0 ratio of 0.41 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 215 mm outside diameter the fatigue load limit Cur is 76 kN, the limiting speed 2,550 r/min and the thermal reference speed 1,640 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 4.64 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.54 kg (2540 g), just 0.26 g per mm² of projected 215×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 185 mm bore, 215 mm outside diameter: at this size the 510 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Reading the RNA48 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 76 kN Cur value. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 215 mm outside diameter and 209 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 185 mm seat, and in planetary gear bearings the 2.54 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 45 mm width and the published 510 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA4834-XL?", "a": "The RNA4834-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 215 mm outside diameter, 185 mm bore and 45 mm width, envelope 185×215×45 mm. Mass is 2.54 kg." }, { "q": "What does the RNA4834-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4834-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 185×215×45 mm and the catalogue ratings are C 209 kN, C0 510 kN, Cur 76 kN." }, { "q": "What is the load capacity of the RNA4834-XL?", "a": "The basic dynamic load rating C is 209 kN and the basic static load rating C0 is 510 kN; the fatigue load limit Cur is 76 kN." }, { "q": "What is the maximum speed of the RNA4834-XL?", "a": "The limiting speed is 2,550 r/min and the thermal reference speed is 1,640 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4834-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4834-XL has no inner ring, so the 185 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4834", "equiv_brand": "SKF", "level": "partial", "note": "Same 185×215×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4834-XL", "RNA4834-XL" ], "locale_variants": {} }, { "sku": "RNA4836-XL", "brand": "FAG", "manufacturer_designation": "RNA4836-XL", "series": "rna48-series", "type": "needle", "d_mm": 195, "D_mm": 225, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 219, "static_load_kN": 550, "fatigue_load_limit_kN": 81, "limiting_speed_rpm": 2420, "max_rpm": 2420, "reference_speed_rpm": 1510, "weight_g": 2680, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 195×225×45 mm: 195 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 219 kN and C0 550 kN at the 195 mm seat; the C/C0 ratio of 0.40 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 225 mm outside diameter the fatigue load limit Cur is 81 kN, the limiting speed 2,420 r/min and the thermal reference speed 1,510 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.12 kN/mm and per millimetre of width 4.87 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.68 kg (2680 g), just 0.26 g per mm² of projected 225×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 195 mm bore, 225 mm outside diameter: at this size the 550 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The hardness requirement is unforgiving: below about 58 HRC the 195 mm journal brinels under the 550 kN static rating, and roughness above raceway finish accelerates roller wear The thin 15.0 mm section makes the 2680 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 219 kN C rating and longer nominal life come without an envelope change. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 225 mm outside diameter and 219 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 195 mm seat, and in small electric motor accessory drives the 2.68 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 45 mm width and the published 550 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA4836-XL?", "a": "The RNA4836-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 225 mm outside diameter, 195 mm bore and 45 mm width, envelope 195×225×45 mm. Mass is 2.68 kg." }, { "q": "What does the RNA4836-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4836-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 195×225×45 mm and the catalogue ratings are C 219 kN, C0 550 kN, Cur 81 kN." }, { "q": "What is the load capacity of the RNA4836-XL?", "a": "The basic dynamic load rating C is 219 kN and the basic static load rating C0 is 550 kN; the fatigue load limit Cur is 81 kN." }, { "q": "What is the maximum speed of the RNA4836-XL?", "a": "The limiting speed is 2,420 r/min and the thermal reference speed is 1,510 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4836-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4836-XL has no inner ring, so the 195 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4836", "equiv_brand": "SKF", "level": "partial", "note": "Same 195×225×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4836-XL", "RNA4836-XL" ], "locale_variants": {} }, { "sku": "RNA4838-XL", "brand": "FAG", "manufacturer_designation": "RNA4838-XL", "series": "rna48-series", "type": "needle", "d_mm": 210, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 255, "static_load_kN": 690, "fatigue_load_limit_kN": 102, "limiting_speed_rpm": 2250, "max_rpm": 2250, "reference_speed_rpm": 1360, "weight_g": 3210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 210×240×50 mm: 210 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 255 kN and C0 690 kN at the 210 mm seat; the C/C0 ratio of 0.37 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 240 mm outside diameter the fatigue load limit Cur is 102 kN, the limiting speed 2,250 r/min and the thermal reference speed 1,360 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.21 kN/mm and per millimetre of width 5.10 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.21 kg (3210 g), just 0.27 g per mm² of projected 240×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 210 mm bore, 240 mm outside diameter: at this size the 690 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs Omitting the inner ring frees radial space — at a 210 mm shaft the outer diameter is only 240 mm and the width 50 mm, yet C is 255 kN -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 255 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 240 mm outside diameter and 255 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 210 mm seat, and in textile machine heald and cam shafts the 3.21 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 50 mm width and the published 690 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4838-XL?", "a": "The RNA4838-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 240 mm outside diameter, 210 mm bore and 50 mm width, envelope 210×240×50 mm. Mass is 3.21 kg." }, { "q": "What does the RNA4838-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4838-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 210×240×50 mm and the catalogue ratings are C 255 kN, C0 690 kN, Cur 102 kN." }, { "q": "What is the load capacity of the RNA4838-XL?", "a": "The basic dynamic load rating C is 255 kN and the basic static load rating C0 is 690 kN; the fatigue load limit Cur is 102 kN." }, { "q": "What is the maximum speed of the RNA4838-XL?", "a": "The limiting speed is 2,250 r/min and the thermal reference speed is 1,360 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4838-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4838-XL has no inner ring, so the 210 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4838", "equiv_brand": "SKF", "level": "partial", "note": "Same 210×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4838-XL", "RNA4838-XL" ], "locale_variants": {} }, { "sku": "RNA4840-XL", "brand": "FAG", "manufacturer_designation": "RNA4840-XL", "series": "rna48-series", "type": "needle", "d_mm": 220, "D_mm": 250, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 260, "static_load_kN": 720, "fatigue_load_limit_kN": 104, "limiting_speed_rpm": 2150, "max_rpm": 2150, "reference_speed_rpm": 1280, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×250×50 mm: 220 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 260 kN and C0 720 kN at the 220 mm seat; the C/C0 ratio of 0.36 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 250 mm outside diameter the fatigue load limit Cur is 104 kN, the limiting speed 2,150 r/min and the thermal reference speed 1,280 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.18 kN/mm and per millimetre of width 5.20 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.35 kg (3350 g), just 0.27 g per mm² of projected 250×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 220 mm bore puts this execution at the top of the HR1 range — the 250 mm outside diameter, 50 mm width and 3.35 kg mass are built for primary-industry load cases Omitting the inner ring frees radial space — at a 220 mm shaft the outer diameter is only 250 mm and the width 50 mm, yet C is 260 kN RNA4840-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 104 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 250 mm outside diameter and 260 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 220 mm seat, and in gearbox selector and change linkages the 3.35 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 50 mm width and the published 720 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4840-XL?", "a": "The RNA4840-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 250 mm outside diameter, 220 mm bore and 50 mm width, envelope 220×250×50 mm. Mass is 3.35 kg." }, { "q": "What does the RNA4840-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4840-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 220×250×50 mm and the catalogue ratings are C 260 kN, C0 720 kN, Cur 104 kN." }, { "q": "What is the load capacity of the RNA4840-XL?", "a": "The basic dynamic load rating C is 260 kN and the basic static load rating C0 is 720 kN; the fatigue load limit Cur is 104 kN." }, { "q": "What is the maximum speed of the RNA4840-XL?", "a": "The limiting speed is 2,150 r/min and the thermal reference speed is 1,280 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4840-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4840-XL has no inner ring, so the 220 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4840", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×250×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4840-XL", "RNA4840-XL" ], "locale_variants": {} }, { "sku": "RNA4844-XL", "brand": "FAG", "manufacturer_designation": "RNA4844-XL", "series": "rna48-series", "type": "needle", "d_mm": 240, "D_mm": 270, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 275, "static_load_kN": 790, "fatigue_load_limit_kN": 112, "limiting_speed_rpm": 1980, "max_rpm": 1980, "reference_speed_rpm": 1130, "weight_g": 3620, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×270×50 mm: 240 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 275 kN and C0 790 kN at the 240 mm seat; the C/C0 ratio of 0.35 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 270 mm outside diameter the fatigue load limit Cur is 112 kN, the limiting speed 1,980 r/min and the thermal reference speed 1,130 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.15 kN/mm and per millimetre of width 5.50 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.62 kg (3620 g), just 0.27 g per mm² of projected 270×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 240 mm bore, 270 mm outside diameter: at this size the 790 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The hardness requirement is unforgiving: below about 58 HRC the 240 mm journal brinels under the 790 kN static rating, and roughness above raceway finish accelerates roller wear -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 275 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 270 mm outside diameter and 275 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 240 mm seat, and in textile machine heald and cam shafts the 3.62 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 50 mm width and the published 790 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA4844-XL?", "a": "The RNA4844-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 270 mm outside diameter, 240 mm bore and 50 mm width, envelope 240×270×50 mm. Mass is 3.62 kg." }, { "q": "What does the RNA4844-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4844-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 240×270×50 mm and the catalogue ratings are C 275 kN, C0 790 kN, Cur 112 kN." }, { "q": "What is the load capacity of the RNA4844-XL?", "a": "The basic dynamic load rating C is 275 kN and the basic static load rating C0 is 790 kN; the fatigue load limit Cur is 112 kN." }, { "q": "What is the maximum speed of the RNA4844-XL?", "a": "The limiting speed is 1,980 r/min and the thermal reference speed is 1,130 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4844-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4844-XL has no inner ring, so the 240 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4844", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×270×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=956", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4844-XL", "RNA4844-XL" ], "locale_variants": {} }, { "sku": "RNA4848-XL", "brand": "FAG", "manufacturer_designation": "RNA4848-XL", "series": "rna48-series", "type": "needle", "d_mm": 265, "D_mm": 300, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 400, "static_load_kN": 1080, "fatigue_load_limit_kN": 153, "limiting_speed_rpm": 1780, "max_rpm": 1780, "reference_speed_rpm": 980, "weight_g": 5400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 265×300×60 mm: 265 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 400 kN and C0 1080 kN at the 265 mm seat; the C/C0 ratio of 0.37 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 300 mm outside diameter the fatigue load limit Cur is 153 kN, the limiting speed 1,780 r/min and the thermal reference speed 980 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.51 kN/mm and per millimetre of width 6.67 kN/mm — the reason 60 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.4 kg (5400 g), just 0.30 g per mm² of projected 300×60 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 265 mm bore, 300 mm outside diameter: at this size the 1080 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs RNA4848-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality The thin 17.5 mm section makes the 5400 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 265×300×60 mm envelope. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 300 mm outside diameter and 400 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 265 mm seat, and in small electric motor accessory drives the 5.4 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 60 mm width and the published 1080 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNA4848-XL?", "a": "The RNA4848-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 300 mm outside diameter, 265 mm bore and 60 mm width, envelope 265×300×60 mm. Mass is 5.4 kg." }, { "q": "What does the RNA4848-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4848-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 265×300×60 mm and the catalogue ratings are C 400 kN, C0 1080 kN, Cur 153 kN." }, { "q": "What is the load capacity of the RNA4848-XL?", "a": "The basic dynamic load rating C is 400 kN and the basic static load rating C0 is 1080 kN; the fatigue load limit Cur is 153 kN." }, { "q": "What is the maximum speed of the RNA4848-XL?", "a": "The limiting speed is 1,780 r/min and the thermal reference speed is 980 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4848-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4848-XL has no inner ring, so the 265 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4848", "equiv_brand": "SKF", "level": "partial", "note": "Same 265×300×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4848-XL", "RNA4848-XL" ], "locale_variants": {} }, { "sku": "RNA4852-XL", "brand": "FAG", "manufacturer_designation": "RNA4852-XL", "series": "rna48-series", "type": "needle", "d_mm": 285, "D_mm": 320, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 1160, "fatigue_load_limit_kN": 161, "limiting_speed_rpm": 1660, "max_rpm": 1660, "reference_speed_rpm": 890, "weight_g": 5800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 285×320×60 mm: 285 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 415 kN and C0 1160 kN at the 285 mm seat; the C/C0 ratio of 0.36 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 320 mm outside diameter the fatigue load limit Cur is 161 kN, the limiting speed 1,660 r/min and the thermal reference speed 890 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.46 kN/mm and per millimetre of width 6.92 kN/mm — the reason 60 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.8 kg (5800 g), just 0.30 g per mm² of projected 320×60 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 285 mm bore puts this execution at the top of the HR1 range — the 320 mm outside diameter, 60 mm width and 5.8 kg mass are built for primary-industry load cases With Cur 161 kN and a 1,660 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins RNA4852-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 415 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 320 mm outside diameter and 415 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 285 mm seat, and in gearbox selector and change linkages the 5.8 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 60 mm width and the published 1160 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4852-XL?", "a": "The RNA4852-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 320 mm outside diameter, 285 mm bore and 60 mm width, envelope 285×320×60 mm. Mass is 5.8 kg." }, { "q": "What does the RNA4852-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4852-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 285×320×60 mm and the catalogue ratings are C 415 kN, C0 1160 kN, Cur 161 kN." }, { "q": "What is the load capacity of the RNA4852-XL?", "a": "The basic dynamic load rating C is 415 kN and the basic static load rating C0 is 1160 kN; the fatigue load limit Cur is 161 kN." }, { "q": "What is the maximum speed of the RNA4852-XL?", "a": "The limiting speed is 1,660 r/min and the thermal reference speed is 890 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4852-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4852-XL has no inner ring, so the 285 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4852", "equiv_brand": "SKF", "level": "partial", "note": "Same 285×320×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4852-XL", "RNA4852-XL" ], "locale_variants": {} }, { "sku": "RNA4856-XL", "brand": "FAG", "manufacturer_designation": "RNA4856-XL", "series": "rna48-series", "type": "needle", "d_mm": 305, "D_mm": 350, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 510, "static_load_kN": 1300, "fatigue_load_limit_kN": 178, "limiting_speed_rpm": 1540, "max_rpm": 1540, "reference_speed_rpm": 850, "weight_g": 9300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 305×350×69 mm: 305 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 22.5 mm radial section packed with small-diameter needle rollers C is 510 kN and C0 1300 kN at the 305 mm seat; the C/C0 ratio of 0.39 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 350 mm outside diameter the fatigue load limit Cur is 178 kN, the limiting speed 1,540 r/min and the thermal reference speed 850 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.67 kN/mm and per millimetre of width 7.39 kN/mm — the reason 69 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 9.3 kg (9300 g), just 0.39 g per mm² of projected 350×69 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 305 mm bore, 350 mm outside diameter: at this size the 1300 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs This bearing accepts axial displacement between shaft and housing because the rollers rotate on the free journal; it locates nothing axially and must be flanked by guide faces The thin 22.5 mm section makes the 9300 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 305×350×69 mm envelope. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 350 mm outside diameter and 510 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 305 mm seat, and in textile machine heald and cam shafts the 9.3 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 69 mm width and the published 1300 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNA4856-XL?", "a": "The RNA4856-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 350 mm outside diameter, 305 mm bore and 69 mm width, envelope 305×350×69 mm. Mass is 9.3 kg." }, { "q": "What does the RNA4856-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4856-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 305×350×69 mm and the catalogue ratings are C 510 kN, C0 1300 kN, Cur 178 kN." }, { "q": "What is the load capacity of the RNA4856-XL?", "a": "The basic dynamic load rating C is 510 kN and the basic static load rating C0 is 1300 kN; the fatigue load limit Cur is 178 kN." }, { "q": "What is the maximum speed of the RNA4856-XL?", "a": "The limiting speed is 1,540 r/min and the thermal reference speed is 850 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4856-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4856-XL has no inner ring, so the 305 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4856", "equiv_brand": "SKF", "level": "partial", "note": "Same 305×350×69 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4856-XL", "RNA4856-XL" ], "locale_variants": {} }, { "sku": "RNA4860-XL", "brand": "FAG", "manufacturer_designation": "RNA4860-XL", "series": "rna48-series", "type": "needle", "d_mm": 330, "D_mm": 380, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 700, "static_load_kN": 1770, "fatigue_load_limit_kN": 239, "limiting_speed_rpm": 1420, "max_rpm": 1420, "reference_speed_rpm": 740, "weight_g": 12700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 330×380×80 mm: 330 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 700 kN and C0 1770 kN at the 330 mm seat; the C/C0 ratio of 0.40 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 380 mm outside diameter the fatigue load limit Cur is 239 kN, the limiting speed 1,420 r/min and the thermal reference speed 740 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.12 kN/mm and per millimetre of width 8.75 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 12.7 kg (12700 g), just 0.42 g per mm² of projected 380×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 330 mm bore puts this execution at the top of the HR1 range — the 380 mm outside diameter, 80 mm width and 12.7 kg mass are built for primary-industry load cases With Cur 239 kN and a 1,420 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The hardness requirement is unforgiving: below about 58 HRC the 330 mm journal brinels under the 1770 kN static rating, and roughness above raceway finish accelerates roller wear -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 700 kN C rating and longer nominal life come without an envelope change. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 380 mm outside diameter and 700 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 330 mm seat, and in motorcycle and light-vehicle transmissions the 12.7 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 80 mm width and the published 1770 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4860-XL?", "a": "The RNA4860-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 380 mm outside diameter, 330 mm bore and 80 mm width, envelope 330×380×80 mm. Mass is 12.7 kg." }, { "q": "What does the RNA4860-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4860-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 330×380×80 mm and the catalogue ratings are C 700 kN, C0 1770 kN, Cur 239 kN." }, { "q": "What is the load capacity of the RNA4860-XL?", "a": "The basic dynamic load rating C is 700 kN and the basic static load rating C0 is 1770 kN; the fatigue load limit Cur is 239 kN." }, { "q": "What is the maximum speed of the RNA4860-XL?", "a": "The limiting speed is 1,420 r/min and the thermal reference speed is 740 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4860-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4860-XL has no inner ring, so the 330 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4860", "equiv_brand": "SKF", "level": "partial", "note": "Same 330×380×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4860-XL", "RNA4860-XL" ], "locale_variants": {} }, { "sku": "RNA4864-XL", "brand": "FAG", "manufacturer_designation": "RNA4864-XL", "series": "rna48-series", "type": "needle", "d_mm": 350, "D_mm": 400, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 710, "static_load_kN": 1850, "fatigue_load_limit_kN": 246, "limiting_speed_rpm": 1340, "max_rpm": 1340, "reference_speed_rpm": 680, "weight_g": 13400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 350×400×80 mm: 350 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 710 kN and C0 1850 kN at the 350 mm seat; the C/C0 ratio of 0.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 400 mm outside diameter the fatigue load limit Cur is 246 kN, the limiting speed 1,340 r/min and the thermal reference speed 680 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.03 kN/mm and per millimetre of width 8.88 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 13.4 kg (13400 g), just 0.42 g per mm² of projected 400×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 350 mm bore, 400 mm outside diameter: at this size the 1850 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs RNA4864-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality With Cur 246 kN and a 1,340 r/min limiting speed the unit suits pivots, rocker arms, pumps and compact gear trains running on hardened pins The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 350×400×80 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 400 mm outside diameter and 710 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 350 mm seat, and in planetary gear bearings the 13.4 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 80 mm width and the published 1850 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNA4864-XL?", "a": "The RNA4864-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 400 mm outside diameter, 350 mm bore and 80 mm width, envelope 350×400×80 mm. Mass is 13.4 kg." }, { "q": "What does the RNA4864-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4864-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 350×400×80 mm and the catalogue ratings are C 710 kN, C0 1850 kN, Cur 246 kN." }, { "q": "What is the load capacity of the RNA4864-XL?", "a": "The basic dynamic load rating C is 710 kN and the basic static load rating C0 is 1850 kN; the fatigue load limit Cur is 246 kN." }, { "q": "What is the maximum speed of the RNA4864-XL?", "a": "The limiting speed is 1,340 r/min and the thermal reference speed is 680 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4864-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4864-XL has no inner ring, so the 350 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4864", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4864-XL", "RNA4864-XL" ], "locale_variants": {} }, { "sku": "RNA4868-XL", "brand": "FAG", "manufacturer_designation": "RNA4868-XL", "series": "rna48-series", "type": "needle", "d_mm": 370, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 730, "static_load_kN": 1940, "fatigue_load_limit_kN": 255, "limiting_speed_rpm": 1270, "max_rpm": 1270, "reference_speed_rpm": 640, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 370×420×80 mm: 370 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 730 kN and C0 1940 kN at the 370 mm seat; the C/C0 ratio of 0.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 420 mm outside diameter the fatigue load limit Cur is 255 kN, the limiting speed 1,270 r/min and the thermal reference speed 640 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.97 kN/mm and per millimetre of width 9.13 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 14 kg (14000 g), just 0.42 g per mm² of projected 420×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 370 mm bore, 420 mm outside diameter: at this size the 1940 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The hardness requirement is unforgiving: below about 58 HRC the 370 mm journal brinels under the 1940 kN static rating, and roughness above raceway finish accelerates roller wear RNA4868-XL has no inner ring: the needle rollers run directly on the shaft journal, so the seat must be hardened (58–64 HRC) and ground to bearing raceway quality X-life status (-XL) indicates the current Schaeffler premium execution at 370 mm bore; the 1940 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 420 mm outside diameter and 730 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 370 mm seat, and in rocker arms and valve trains the 14 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearings, relying on the 80 mm width and the published 1940 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNA4868-XL?", "a": "The RNA4868-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 420 mm outside diameter, 370 mm bore and 80 mm width, envelope 370×420×80 mm. Mass is 14 kg." }, { "q": "What does the RNA4868-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4868-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 370×420×80 mm and the catalogue ratings are C 730 kN, C0 1940 kN, Cur 255 kN." }, { "q": "What is the load capacity of the RNA4868-XL?", "a": "The basic dynamic load rating C is 730 kN and the basic static load rating C0 is 1940 kN; the fatigue load limit Cur is 255 kN." }, { "q": "What is the maximum speed of the RNA4868-XL?", "a": "The limiting speed is 1,270 r/min and the thermal reference speed is 640 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4868-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4868-XL has no inner ring, so the 370 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4868", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4868-XL", "RNA4868-XL" ], "locale_variants": {} }, { "sku": "RNA4872-XL", "brand": "FAG", "manufacturer_designation": "RNA4872-XL", "series": "rna48-series", "type": "needle", "d_mm": 390, "D_mm": 440, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 740, "static_load_kN": 2020, "fatigue_load_limit_kN": 260, "limiting_speed_rpm": 1210, "max_rpm": 1210, "reference_speed_rpm": 600, "weight_g": 14800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 390×440×80 mm: 390 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 740 kN and C0 2020 kN at the 390 mm seat; the C/C0 ratio of 0.37 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 440 mm outside diameter the fatigue load limit Cur is 260 kN, the limiting speed 1,210 r/min and the thermal reference speed 600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.90 kN/mm and per millimetre of width 9.25 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 14.8 kg (14800 g), just 0.42 g per mm² of projected 440×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 390 mm bore puts this execution at the top of the HR1 range — the 440 mm outside diameter, 80 mm width and 14.8 kg mass are built for primary-industry load cases Reading the RNA48 prefix: a machined (not drawn-cup) outer ring with the needle complement; an inner ring from the IR series can be added later if the shaft cannot be hardened The hardness requirement is unforgiving: below about 58 HRC the 390 mm journal brinels under the 2020 kN static rating, and roughness above raceway finish accelerates roller wear The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 390×440×80 mm envelope. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 440 mm outside diameter and 740 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 390 mm seat, and in motorcycle and light-vehicle transmissions the 14.8 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 80 mm width and the published 2020 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNA4872-XL?", "a": "The RNA4872-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 440 mm outside diameter, 390 mm bore and 80 mm width, envelope 390×440×80 mm. Mass is 14.8 kg." }, { "q": "What does the RNA4872-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4872-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 390×440×80 mm and the catalogue ratings are C 740 kN, C0 2020 kN, Cur 260 kN." }, { "q": "What is the load capacity of the RNA4872-XL?", "a": "The basic dynamic load rating C is 740 kN and the basic static load rating C0 is 2020 kN; the fatigue load limit Cur is 260 kN." }, { "q": "What is the maximum speed of the RNA4872-XL?", "a": "The limiting speed is 1,210 r/min and the thermal reference speed is 600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4872-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4872-XL has no inner ring, so the 390 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4872", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4872-XL", "RNA4872-XL" ], "locale_variants": {} }, { "sku": "RNA4876-XL", "brand": "FAG", "manufacturer_designation": "RNA4876-XL", "series": "rna48-series", "type": "needle", "d_mm": 415, "D_mm": 480, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 2900, "fatigue_load_limit_kN": 375, "limiting_speed_rpm": 1130, "max_rpm": 1130, "reference_speed_rpm": 520, "weight_g": 26000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 415×480×100 mm: 415 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 32.5 mm radial section packed with small-diameter needle rollers C is 1130 kN and C0 2900 kN at the 415 mm seat; the C/C0 ratio of 0.39 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 480 mm outside diameter the fatigue load limit Cur is 375 kN, the limiting speed 1,130 r/min and the thermal reference speed 520 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.72 kN/mm and per millimetre of width 11.30 kN/mm — the reason 100 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 26 kg (26000 g), just 0.54 g per mm² of projected 480×100 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 415 mm bore, 480 mm outside diameter: at this size the 2900 kN C0 rating and rigid full-complement pack replace multi-bearing arrangements in compact heavy-duty designs The thin 32.5 mm section makes the 26000 g bearing sensitive to seat geometry — a tapered or lobed journal preloads part of the needle set and shows up as local pitting X-life status (-XL) indicates the current Schaeffler premium execution at 415 mm bore; the 2900 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 480 mm outside diameter and 1130 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 415 mm seat, and in agricultural machine pivots and linkages the 26 kg mass is part of the rotor inertia calculation. Designers also specify it for connecting-rod small ends, relying on the 100 mm width and the published 2900 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNA4876-XL?", "a": "The RNA4876-XL is a RNA48 dimension-series 48 needle roller bearing without inner ring with 480 mm outside diameter, 415 mm bore and 100 mm width, envelope 415×480×100 mm. Mass is 26 kg." }, { "q": "What does the RNA4876-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNA4876-XL identifies this RNA48 dimension-series 48 needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 415×480×100 mm and the catalogue ratings are C 1130 kN, C0 2900 kN, Cur 375 kN." }, { "q": "What is the load capacity of the RNA4876-XL?", "a": "The basic dynamic load rating C is 1130 kN and the basic static load rating C0 is 2900 kN; the fatigue load limit Cur is 375 kN." }, { "q": "What is the maximum speed of the RNA4876-XL?", "a": "The limiting speed is 1,130 r/min and the thermal reference speed is 520 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNA4876-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNA4876-XL has no inner ring, so the 415 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNA4876", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=957", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA4876-XL", "RNA4876-XL" ], "locale_variants": {} }, { "sku": "NKI5-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI5/12-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 5, "D_mm": 15, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 4.45, "static_load_kN": 4.1, "fatigue_load_limit_kN": 0.7, "limiting_speed_rpm": 32500, "max_rpm": 32500, "reference_speed_rpm": 32500, "weight_g": 11.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×15×12 mm: 5 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 4.45 kN and C0 4.1 kN at the 5 mm seat; the C/C0 ratio of 1.09 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 15 mm outside diameter the fatigue load limit Cur is 0.7 kN, the limiting speed 32,500 r/min and the thermal reference speed 32,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.89 kN/mm and per millimetre of width 0.37 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 11.5 g, just 0.06 g per mm² of projected 15×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 5 mm bore and only 11.5 g: the smallest sizes demand accurate shaft geometry, because the 5.0 mm section leaves no tolerance for a soft or tapered seat The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 4.1 kN C0 rating still assumes full rigid support under both rings The 5.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 5×15×12 mm envelope. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 32,500 r/min limiting speed without roller-to-roller sliding. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 15 mm outside diameter and 4.45 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 5 mm seat, and in textile machine heald and cam shafts the 11.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 12 mm width and the published 4.1 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI5/12-TV-XL?", "a": "The NKI5/12-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 15 mm outside diameter, 5 mm bore and 12 mm width, envelope 5×15×12 mm. Mass is 11.5 g." }, { "q": "What does the NKI5/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI5/12-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 5×15×12 mm and the catalogue ratings are C 4.45 kN, C0 4.1 kN, Cur 0.7 kN." }, { "q": "What is the load capacity of the NKI5/12-TV-XL?", "a": "The basic dynamic load rating C is 4.45 kN and the basic static load rating C0 is 4.1 kN; the fatigue load limit Cur is 0.7 kN." }, { "q": "What is the maximum speed of the NKI5/12-TV-XL?", "a": "The limiting speed is 32,500 r/min and the thermal reference speed is 32,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI5/12-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 5 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI5-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 5×15×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI5-16-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI5-12-TV-XL", "NKI5/12-TV-XL" ], "locale_variants": {} }, { "sku": "NKI5-16-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI5/16-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 5, "D_mm": 15, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.8, "static_load_kN": 5.8, "fatigue_load_limit_kN": 0.99, "limiting_speed_rpm": 32500, "max_rpm": 32500, "reference_speed_rpm": 32000, "weight_g": 15.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×15×16 mm: 5 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 5.8 kN and C0 5.8 kN at the 5 mm seat; the C/C0 ratio of 1.00 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 15 mm outside diameter the fatigue load limit Cur is 0.99 kN, the limiting speed 32,500 r/min and the thermal reference speed 32,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.16 kN/mm and per millimetre of width 0.36 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 15.3 g, just 0.06 g per mm² of projected 15×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 5 mm bore this is one of the smallest HR1 executions — chosen where a 15 mm envelope must carry line-contact loads that no miniature ball bearing could take NKI5/16-TV-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 5.8 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 5.8 kN C rating and longer nominal life come without an envelope change. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 32,500 r/min limiting speed without roller-to-roller sliding. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 15 mm outside diameter and 5.8 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 5 mm seat, and in connecting-rod small ends the 15.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 16 mm width and the published 5.8 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI5/16-TV-XL?", "a": "The NKI5/16-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 15 mm outside diameter, 5 mm bore and 16 mm width, envelope 5×15×16 mm. Mass is 15.3 g." }, { "q": "What does the NKI5/16-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI5/16-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 5×15×16 mm and the catalogue ratings are C 5.8 kN, C0 5.8 kN, Cur 0.99 kN." }, { "q": "What is the load capacity of the NKI5/16-TV-XL?", "a": "The basic dynamic load rating C is 5.8 kN and the basic static load rating C0 is 5.8 kN; the fatigue load limit Cur is 0.99 kN." }, { "q": "What is the maximum speed of the NKI5/16-TV-XL?", "a": "The limiting speed is 32,500 r/min and the thermal reference speed is 32,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI5/16-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 5 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI5-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI5-16-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 5×15×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI5-16-TV-XL", "NKI5/16-TV-XL" ], "locale_variants": {} }, { "sku": "NKI6-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI6/12-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 6, "D_mm": 16, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.1, "static_load_kN": 5, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 31000, "max_rpm": 31000, "reference_speed_rpm": 28500, "weight_g": 13.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×16×12 mm: 6 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 5.1 kN and C0 5 kN at the 6 mm seat; the C/C0 ratio of 1.02 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 16 mm outside diameter the fatigue load limit Cur is 0.86 kN, the limiting speed 31,000 r/min and the thermal reference speed 28,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.85 kN/mm and per millimetre of width 0.42 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 13.5 g, just 0.07 g per mm² of projected 16×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 6 mm bore sits in the miniature band; at 12 mm wide the NKI6/12-TV-XL is built into compact cam drives, indexing pawls and light linkages NKI6/12-TV-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 5 kN C0 rating still assumes full rigid support under both rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 0.86 kN Cur value. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 16 mm outside diameter and 5.1 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 6 mm seat, and in two-stroke and compressor piston pins the 13.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 12 mm width and the published 5 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI6/12-TV-XL?", "a": "The NKI6/12-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 16 mm outside diameter, 6 mm bore and 12 mm width, envelope 6×16×12 mm. Mass is 13.5 g." }, { "q": "What does the NKI6/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI6/12-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 6×16×12 mm and the catalogue ratings are C 5.1 kN, C0 5 kN, Cur 0.86 kN." }, { "q": "What is the load capacity of the NKI6/12-TV-XL?", "a": "The basic dynamic load rating C is 5.1 kN and the basic static load rating C0 is 5 kN; the fatigue load limit Cur is 0.86 kN." }, { "q": "What is the maximum speed of the NKI6/12-TV-XL?", "a": "The limiting speed is 31,000 r/min and the thermal reference speed is 28,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI6/12-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 6 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI6-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 6×16×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI6-16-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI6-12-TV-XL", "NKI6/12-TV-XL" ], "locale_variants": {} }, { "sku": "NKI6-16-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI6/16-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 6, "D_mm": 16, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 6.6, "static_load_kN": 7.1, "fatigue_load_limit_kN": 1.21, "limiting_speed_rpm": 31000, "max_rpm": 31000, "reference_speed_rpm": 28000, "weight_g": 17.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×16×16 mm: 6 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 6.6 kN and C0 7.1 kN at the 6 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 16 mm outside diameter the fatigue load limit Cur is 1.21 kN, the limiting speed 31,000 r/min and the thermal reference speed 28,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.10 kN/mm and per millimetre of width 0.41 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 17.4 g, just 0.07 g per mm² of projected 16×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 6 mm bore and only 17.4 g: the smallest sizes demand accurate shaft geometry, because the 5.0 mm section leaves no tolerance for a soft or tapered seat NKI6/16-TV-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 6.6 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 6 mm bore; the 7.1 kN C0 rating reflects the improved rolling-contact geometry. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 31,000 r/min limiting speed without roller-to-roller sliding. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 16 mm outside diameter and 6.6 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 6 mm seat, and in rocker arms and valve trains the 17.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 16 mm width and the published 7.1 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI6/16-TV-XL?", "a": "The NKI6/16-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 16 mm outside diameter, 6 mm bore and 16 mm width, envelope 6×16×16 mm. Mass is 17.4 g." }, { "q": "What does the NKI6/16-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI6/16-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 6×16×16 mm and the catalogue ratings are C 6.6 kN, C0 7.1 kN, Cur 1.21 kN." }, { "q": "What is the load capacity of the NKI6/16-TV-XL?", "a": "The basic dynamic load rating C is 6.6 kN and the basic static load rating C0 is 7.1 kN; the fatigue load limit Cur is 1.21 kN." }, { "q": "What is the maximum speed of the NKI6/16-TV-XL?", "a": "The limiting speed is 31,000 r/min and the thermal reference speed is 28,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI6/16-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 6 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI6-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI6-16-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 6×16×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI6-16-TV-XL", "NKI6/16-TV-XL" ], "locale_variants": {} }, { "sku": "NKI7-12-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI7/12-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 7, "D_mm": 17, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.3, "static_load_kN": 5.5, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 29500, "max_rpm": 29500, "reference_speed_rpm": 26000, "weight_g": 13.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 7×17×12 mm: 7 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 5.3 kN and C0 5.5 kN at the 7 mm seat; the C/C0 ratio of 0.96 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 17 mm outside diameter the fatigue load limit Cur is 0.94 kN, the limiting speed 29,500 r/min and the thermal reference speed 26,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.76 kN/mm and per millimetre of width 0.44 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 13.7 g, just 0.07 g per mm² of projected 17×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 7 mm bore and only 13.7 g: the smallest sizes demand accurate shaft geometry, because the 5.0 mm section leaves no tolerance for a soft or tapered seat This is the choice for OEM production on soft shafts: machine the 7 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway NKI7/12-TV-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required X-life status (-XL) indicates the current Schaeffler premium execution at 7 mm bore; the 5.5 kN C0 rating reflects the improved rolling-contact geometry. With the -TV polyamide cage the rollers are positively separated, so the 7 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 17 mm outside diameter and 5.3 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 7 mm seat, and in hydraulic and pneumatic pump eccentrics the 13.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 12 mm width and the published 5.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI7/12-TV-XL?", "a": "The NKI7/12-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 17 mm outside diameter, 7 mm bore and 12 mm width, envelope 7×17×12 mm. Mass is 13.7 g." }, { "q": "What does the NKI7/12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI7/12-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 7×17×12 mm and the catalogue ratings are C 5.3 kN, C0 5.5 kN, Cur 0.94 kN." }, { "q": "What is the load capacity of the NKI7/12-TV-XL?", "a": "The basic dynamic load rating C is 5.3 kN and the basic static load rating C0 is 5.5 kN; the fatigue load limit Cur is 0.94 kN." }, { "q": "What is the maximum speed of the NKI7/12-TV-XL?", "a": "The limiting speed is 29,500 r/min and the thermal reference speed is 26,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI7/12-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 7 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI7-12-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI7-16-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI7-12-TV-XL", "NKI7/12-TV-XL" ], "locale_variants": {} }, { "sku": "NKI7-16-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI7/16-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 7, "D_mm": 17, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 7, "static_load_kN": 7.8, "fatigue_load_limit_kN": 1.33, "limiting_speed_rpm": 29500, "max_rpm": 29500, "reference_speed_rpm": 25500, "weight_g": 18.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 7×17×16 mm: 7 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 7 kN and C0 7.8 kN at the 7 mm seat; the C/C0 ratio of 0.90 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 17 mm outside diameter the fatigue load limit Cur is 1.33 kN, the limiting speed 29,500 r/min and the thermal reference speed 25,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.00 kN/mm and per millimetre of width 0.44 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 18.2 g, just 0.07 g per mm² of projected 17×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 7 mm bore this is one of the smallest HR1 executions — chosen where a 17 mm envelope must carry line-contact loads that no miniature ball bearing could take Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 7 kN C The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 7.8 kN C0 rating still assumes full rigid support under both rings The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 29,500 r/min limit. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 17 mm outside diameter and 7 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 7 mm seat, and in agricultural machine pivots and linkages the 18.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 16 mm width and the published 7.8 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI7/16-TV-XL?", "a": "The NKI7/16-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 17 mm outside diameter, 7 mm bore and 16 mm width, envelope 7×17×16 mm. Mass is 18.2 g." }, { "q": "What does the NKI7/16-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI7/16-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 7×17×16 mm and the catalogue ratings are C 7 kN, C0 7.8 kN, Cur 1.33 kN." }, { "q": "What is the load capacity of the NKI7/16-TV-XL?", "a": "The basic dynamic load rating C is 7 kN and the basic static load rating C0 is 7.8 kN; the fatigue load limit Cur is 1.33 kN." }, { "q": "What is the maximum speed of the NKI7/16-TV-XL?", "a": "The limiting speed is 29,500 r/min and the thermal reference speed is 25,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI7/16-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 7 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI7-12-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI7-16-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 7×17×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI7-16-TV-XL", "NKI7/16-TV-XL" ], "locale_variants": {} }, { "sku": "NKI9-12-XL", "brand": "FAG", "manufacturer_designation": "NKI9/12-XL", "series": "nki-series", "type": "needle", "d_mm": 9, "D_mm": 19, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.2, "static_load_kN": 7.1, "fatigue_load_limit_kN": 1.31, "limiting_speed_rpm": 26500, "max_rpm": 26500, "reference_speed_rpm": 20200, "weight_g": 16.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 9×19×12 mm: 9 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 7.2 kN and C0 7.1 kN at the 9 mm seat; the C/C0 ratio of 1.01 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 19 mm outside diameter the fatigue load limit Cur is 1.31 kN, the limiting speed 26,500 r/min and the thermal reference speed 20,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.80 kN/mm and per millimetre of width 0.60 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 16.6 g, just 0.07 g per mm² of projected 19×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 9 mm bore and only 16.6 g: the smallest sizes demand accurate shaft geometry, because the 5.0 mm section leaves no tolerance for a soft or tapered seat The integral inner ring brings the bore to 9 mm inside the 19×12 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing This is the choice for OEM production on soft shafts: machine the 9 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 1.31 kN Cur value. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 19 mm outside diameter and 7.2 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 9 mm seat, and in copying and printing machine mechanisms the 16.6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 12 mm width and the published 7.1 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKI9/12-XL?", "a": "The NKI9/12-XL is a NKI machined-ring needle roller bearing with inner ring with 19 mm outside diameter, 9 mm bore and 12 mm width, envelope 9×19×12 mm. Mass is 16.6 g." }, { "q": "What does the NKI9/12-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI9/12-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 9×19×12 mm and the catalogue ratings are C 7.2 kN, C0 7.1 kN, Cur 1.31 kN." }, { "q": "What is the load capacity of the NKI9/12-XL?", "a": "The basic dynamic load rating C is 7.2 kN and the basic static load rating C0 is 7.1 kN; the fatigue load limit Cur is 1.31 kN." }, { "q": "What is the maximum speed of the NKI9/12-XL?", "a": "The limiting speed is 26,500 r/min and the thermal reference speed is 20,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI9/12-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 9 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI9-12", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×19×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI9-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI9-12-XL", "NKI9/12-XL" ], "locale_variants": {} }, { "sku": "NKI9-16-XL", "brand": "FAG", "manufacturer_designation": "NKI9/16-XL", "series": "nki-series", "type": "needle", "d_mm": 9, "D_mm": 19, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.1, "static_load_kN": 11, "fatigue_load_limit_kN": 1.95, "limiting_speed_rpm": 26500, "max_rpm": 26500, "reference_speed_rpm": 19500, "weight_g": 21.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 9×19×16 mm: 9 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 10.1 kN and C0 11 kN at the 9 mm seat; the C/C0 ratio of 0.92 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 19 mm outside diameter the fatigue load limit Cur is 1.95 kN, the limiting speed 26,500 r/min and the thermal reference speed 19,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.12 kN/mm and per millimetre of width 0.63 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 21.9 g, just 0.07 g per mm² of projected 19×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 9 mm bore sits in the miniature band; at 16 mm wide the NKI9/16-XL is built into compact cam drives, indexing pawls and light linkages The 5.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 11 kN C0 rating still assumes full rigid support under both rings -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 10.1 kN C rating and longer nominal life come without an envelope change. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 19 mm outside diameter and 10.1 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 9 mm seat, and in connecting-rod small ends the 21.9 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 16 mm width and the published 11 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI9/16-XL?", "a": "The NKI9/16-XL is a NKI machined-ring needle roller bearing with inner ring with 19 mm outside diameter, 9 mm bore and 16 mm width, envelope 9×19×16 mm. Mass is 21.9 g." }, { "q": "What does the NKI9/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI9/16-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 9×19×16 mm and the catalogue ratings are C 10.1 kN, C0 11 kN, Cur 1.95 kN." }, { "q": "What is the load capacity of the NKI9/16-XL?", "a": "The basic dynamic load rating C is 10.1 kN and the basic static load rating C0 is 11 kN; the fatigue load limit Cur is 1.95 kN." }, { "q": "What is the maximum speed of the NKI9/16-XL?", "a": "The limiting speed is 26,500 r/min and the thermal reference speed is 19,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI9/16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 9 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI9-12", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI9-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 9×19×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI9-16-XL", "NKI9/16-XL" ], "locale_variants": {} }, { "sku": "NKI10-16-XL", "brand": "FAG", "manufacturer_designation": "NKI10/16-XL", "series": "nki-series", "type": "needle", "d_mm": 10, "D_mm": 22, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.4, "static_load_kN": 11.5, "fatigue_load_limit_kN": 2.14, "limiting_speed_rpm": 24600, "max_rpm": 24600, "reference_speed_rpm": 16400, "weight_g": 29.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×22×16 mm: 10 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 11.4 kN and C0 11.5 kN at the 10 mm seat; the C/C0 ratio of 0.99 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 2.14 kN, the limiting speed 24,600 r/min and the thermal reference speed 16,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.14 kN/mm and per millimetre of width 0.71 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 29.4 g, just 0.08 g per mm² of projected 22×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 10 mm bore this is one of the smallest HR1 executions — chosen where a 22 mm envelope must carry line-contact loads that no miniature ball bearing could take Cur 2.14 kN, limiting speed 24,600 r/min, reference speed 16,400 r/min — the inner ring adds a few grams (total 29.4 g) but removes the hardening requirement The integral inner ring brings the bore to 10 mm inside the 22×16 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 10×22×16 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 22 mm outside diameter and 11.4 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 10 mm seat, and in two-stroke and compressor piston pins the 29.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 16 mm width and the published 11.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI10/16-XL?", "a": "The NKI10/16-XL is a NKI machined-ring needle roller bearing with inner ring with 22 mm outside diameter, 10 mm bore and 16 mm width, envelope 10×22×16 mm. Mass is 29.4 g." }, { "q": "What does the NKI10/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI10/16-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 10×22×16 mm and the catalogue ratings are C 11.4 kN, C0 11.5 kN, Cur 2.14 kN." }, { "q": "What is the load capacity of the NKI10/16-XL?", "a": "The basic dynamic load rating C is 11.4 kN and the basic static load rating C0 is 11.5 kN; the fatigue load limit Cur is 2.14 kN." }, { "q": "What is the maximum speed of the NKI10/16-XL?", "a": "The limiting speed is 24,600 r/min and the thermal reference speed is 16,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI10/16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 10 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI10-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI10-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI10-16-XL", "NKI10/16-XL" ], "locale_variants": {} }, { "sku": "NKI10-20-XL", "brand": "FAG", "manufacturer_designation": "NKI10/20-XL", "series": "nki-series", "type": "needle", "d_mm": 10, "D_mm": 22, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.5, "static_load_kN": 15.6, "fatigue_load_limit_kN": 2.75, "limiting_speed_rpm": 24600, "max_rpm": 24600, "reference_speed_rpm": 16100, "weight_g": 37.1, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×22×20 mm: 10 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 14.5 kN and C0 15.6 kN at the 10 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 2.75 kN, the limiting speed 24,600 r/min and the thermal reference speed 16,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.45 kN/mm and per millimetre of width 0.72 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 37.1 g, just 0.08 g per mm² of projected 22×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 10 mm bore sits in the miniature band; at 20 mm wide the NKI10/20-XL is built into compact cam drives, indexing pawls and light linkages This is the choice for OEM production on soft shafts: machine the 10 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The 6.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 2.75 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 22 mm outside diameter and 14.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 10 mm seat, and in connecting-rod small ends the 37.1 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 20 mm width and the published 15.6 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI10/20-XL?", "a": "The NKI10/20-XL is a NKI machined-ring needle roller bearing with inner ring with 22 mm outside diameter, 10 mm bore and 20 mm width, envelope 10×22×20 mm. Mass is 37.1 g." }, { "q": "What does the NKI10/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI10/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 10×22×20 mm and the catalogue ratings are C 14.5 kN, C0 15.6 kN, Cur 2.75 kN." }, { "q": "What is the load capacity of the NKI10/20-XL?", "a": "The basic dynamic load rating C is 14.5 kN and the basic static load rating C0 is 15.6 kN; the fatigue load limit Cur is 2.75 kN." }, { "q": "What is the maximum speed of the NKI10/20-XL?", "a": "The limiting speed is 24,600 r/min and the thermal reference speed is 16,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI10/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 10 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI10-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI10-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI10-20-XL", "NKI10/20-XL" ], "locale_variants": {} }, { "sku": "NA4900-XL", "brand": "FAG", "manufacturer_designation": "NA4900-XL", "series": "na49-series", "type": "needle", "d_mm": 10, "D_mm": 22, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.6, "static_load_kN": 9.2, "fatigue_load_limit_kN": 1.66, "limiting_speed_rpm": 24600, "max_rpm": 24600, "reference_speed_rpm": 16400, "weight_g": 23, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×22×13 mm: 10 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 9.6 kN and C0 9.2 kN at the 10 mm seat; the C/C0 ratio of 1.04 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 1.66 kN, the limiting speed 24,600 r/min and the thermal reference speed 16,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 0.74 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 23 g, just 0.08 g per mm² of projected 22×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 10 mm bore and only 23 g: the smallest sizes demand accurate shaft geometry, because the 6.0 mm section leaves no tolerance for a soft or tapered seat Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 9.6 kN C The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 9.2 kN C0 rating still assumes full rigid support under both rings The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 10×22×13 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 22 mm outside diameter and 9.6 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 10 mm seat, and in two-stroke and compressor piston pins the 23 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 13 mm width and the published 9.2 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA4900-XL?", "a": "The NA4900-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 22 mm outside diameter, 10 mm bore and 13 mm width, envelope 10×22×13 mm. Mass is 23 g." }, { "q": "What does the NA4900-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4900-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 10×22×13 mm and the catalogue ratings are C 9.6 kN, C0 9.2 kN, Cur 1.66 kN." }, { "q": "What is the load capacity of the NA4900-XL?", "a": "The basic dynamic load rating C is 9.6 kN and the basic static load rating C0 is 9.2 kN; the fatigue load limit Cur is 1.66 kN." }, { "q": "What is the maximum speed of the NA4900-XL?", "a": "The limiting speed is 24,600 r/min and the thermal reference speed is 16,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4900-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 10 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4900", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4900-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4900-XL", "NA4900-XL" ], "locale_variants": {} }, { "sku": "NKI12-16-XL", "brand": "FAG", "manufacturer_designation": "NKI12/16-XL", "series": "nki-series", "type": "needle", "d_mm": 12, "D_mm": 24, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.8, "static_load_kN": 13.9, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 14500, "weight_g": 33.3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×24×16 mm: 12 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 12.8 kN and C0 13.9 kN at the 12 mm seat; the C/C0 ratio of 0.92 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 2.6 kN, the limiting speed 23,200 r/min and the thermal reference speed 14,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.07 kN/mm and per millimetre of width 0.80 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 33.3 g, just 0.09 g per mm² of projected 24×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 12 mm bore and only 33.3 g: the smallest sizes demand accurate shaft geometry, because the 6.0 mm section leaves no tolerance for a soft or tapered seat The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 13.9 kN C0 rating still assumes full rigid support under both rings NKI12/16-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 12.8 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 24 mm outside diameter and 12.8 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 12 mm seat, and in gearbox selector and change linkages the 33.3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 16 mm width and the published 13.9 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI12/16-XL?", "a": "The NKI12/16-XL is a NKI machined-ring needle roller bearing with inner ring with 24 mm outside diameter, 12 mm bore and 16 mm width, envelope 12×24×16 mm. Mass is 33.3 g." }, { "q": "What does the NKI12/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI12/16-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×24×16 mm and the catalogue ratings are C 12.8 kN, C0 13.9 kN, Cur 2.6 kN." }, { "q": "What is the load capacity of the NKI12/16-XL?", "a": "The basic dynamic load rating C is 12.8 kN and the basic static load rating C0 is 13.9 kN; the fatigue load limit Cur is 2.6 kN." }, { "q": "What is the maximum speed of the NKI12/16-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 14,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI12/16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 12 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI12-16", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NKI12-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI12-16-XL", "NKI12/16-XL" ], "locale_variants": {} }, { "sku": "NKI12-20-XL", "brand": "FAG", "manufacturer_designation": "NKI12/20-XL", "series": "nki-series", "type": "needle", "d_mm": 12, "D_mm": 24, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.3, "static_load_kN": 18.8, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 14200, "weight_g": 41.9, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×24×20 mm: 12 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 16.3 kN and C0 18.8 kN at the 12 mm seat; the C/C0 ratio of 0.87 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 3.35 kN, the limiting speed 23,200 r/min and the thermal reference speed 14,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.36 kN/mm and per millimetre of width 0.82 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 41.9 g, just 0.09 g per mm² of projected 24×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 12 mm bore this is one of the smallest HR1 executions — chosen where a 24 mm envelope must carry line-contact loads that no miniature ball bearing could take Cur 3.35 kN, limiting speed 23,200 r/min, reference speed 14,200 r/min — the inner ring adds a few grams (total 41.9 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.35 kN Cur value. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 24 mm outside diameter and 16.3 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 12 mm seat, and in hydraulic and pneumatic pump eccentrics the 41.9 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 18.8 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI12/20-XL?", "a": "The NKI12/20-XL is a NKI machined-ring needle roller bearing with inner ring with 24 mm outside diameter, 12 mm bore and 20 mm width, envelope 12×24×20 mm. Mass is 41.9 g." }, { "q": "What does the NKI12/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI12/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×24×20 mm and the catalogue ratings are C 16.3 kN, C0 18.8 kN, Cur 3.35 kN." }, { "q": "What is the load capacity of the NKI12/20-XL?", "a": "The basic dynamic load rating C is 16.3 kN and the basic static load rating C0 is 18.8 kN; the fatigue load limit Cur is 3.35 kN." }, { "q": "What is the maximum speed of the NKI12/20-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 14,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI12/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 12 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI12-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI12-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI12-20-XL", "NKI12/20-XL" ], "locale_variants": {} }, { "sku": "NA4901-XL", "brand": "FAG", "manufacturer_designation": "NA4901-XL", "series": "na49-series", "type": "needle", "d_mm": 12, "D_mm": 24, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.6, "static_load_kN": 10.9, "fatigue_load_limit_kN": 1.97, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 14200, "weight_g": 26, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×24×13 mm: 12 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 10.6 kN and C0 10.9 kN at the 12 mm seat; the C/C0 ratio of 0.97 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 1.97 kN, the limiting speed 23,200 r/min and the thermal reference speed 14,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 0.82 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 26 g, just 0.08 g per mm² of projected 24×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 12 mm bore and only 26 g: the smallest sizes demand accurate shaft geometry, because the 6.0 mm section leaves no tolerance for a soft or tapered seat NA4901-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 10.9 kN C0 rating still assumes full rigid support under both rings The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 12×24×13 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 24 mm outside diameter and 10.6 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 12 mm seat, and in planetary gear bearings the 26 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 13 mm width and the published 10.9 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA4901-XL?", "a": "The NA4901-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 24 mm outside diameter, 12 mm bore and 13 mm width, envelope 12×24×13 mm. Mass is 26 g." }, { "q": "What does the NA4901-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4901-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×24×13 mm and the catalogue ratings are C 10.6 kN, C0 10.9 kN, Cur 1.97 kN." }, { "q": "What is the load capacity of the NA4901-XL?", "a": "The basic dynamic load rating C is 10.6 kN and the basic static load rating C0 is 10.9 kN; the fatigue load limit Cur is 1.97 kN." }, { "q": "What is the maximum speed of the NA4901-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 14,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4901-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 12 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4901", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4901-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4901-XL", "NA4901-XL" ], "locale_variants": {} }, { "sku": "NA6901-XL", "brand": "FAG", "manufacturer_designation": "NA6901-XL", "series": "na69-series", "type": "needle", "d_mm": 12, "D_mm": 24, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 18.1, "static_load_kN": 21.6, "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 23200, "max_rpm": 23200, "reference_speed_rpm": 13300, "weight_g": 46, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×24×22 mm: 12 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 18.1 kN and C0 21.6 kN at the 12 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 3.85 kN, the limiting speed 23,200 r/min and the thermal reference speed 13,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.51 kN/mm and per millimetre of width 0.82 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 46 g, just 0.09 g per mm² of projected 24×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 12 mm bore sits in the miniature band; at 22 mm wide the NA6901-XL is built into compact cam drives, indexing pawls and light linkages The 6.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The integral inner ring brings the bore to 12 mm inside the 24×22 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 12×24×22 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 24 mm outside diameter and 18.1 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 12 mm seat, and in two-stroke and compressor piston pins the 46 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 22 mm width and the published 21.6 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA6901-XL?", "a": "The NA6901-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 24 mm outside diameter, 12 mm bore and 22 mm width, envelope 12×24×22 mm. Mass is 46 g." }, { "q": "What does the NA6901-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6901-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×24×22 mm and the catalogue ratings are C 18.1 kN, C0 21.6 kN, Cur 3.85 kN." }, { "q": "What is the load capacity of the NA6901-XL?", "a": "The basic dynamic load rating C is 18.1 kN and the basic static load rating C0 is 21.6 kN; the fatigue load limit Cur is 3.85 kN." }, { "q": "What is the maximum speed of the NA6901-XL?", "a": "The limiting speed is 23,200 r/min and the thermal reference speed is 13,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6901-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 12 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6901", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6901-XL", "NA6901-XL" ], "locale_variants": {} }, { "sku": "NKI15-16-XL", "brand": "FAG", "manufacturer_designation": "NKI15/16-XL", "series": "nki-series", "type": "needle", "d_mm": 15, "D_mm": 27, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.7, "static_load_kN": 17.4, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 21600, "max_rpm": 21600, "reference_speed_rpm": 12400, "weight_g": 38.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×27×16 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 14.7 kN and C0 17.4 kN at the 15 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 27 mm outside diameter the fatigue load limit Cur is 3.25 kN, the limiting speed 21,600 r/min and the thermal reference speed 12,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.98 kN/mm and per millimetre of width 0.92 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 38.8 g, just 0.09 g per mm² of projected 27×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 15 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 17.4 kN C0 rating still assumes full rigid support under both rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.25 kN Cur value. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 27 mm outside diameter and 14.7 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 15 mm seat, and in hydraulic and pneumatic pump eccentrics the 38.8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 16 mm width and the published 17.4 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI15/16-XL?", "a": "The NKI15/16-XL is a NKI machined-ring needle roller bearing with inner ring with 27 mm outside diameter, 15 mm bore and 16 mm width, envelope 15×27×16 mm. Mass is 38.8 g." }, { "q": "What does the NKI15/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI15/16-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×27×16 mm and the catalogue ratings are C 14.7 kN, C0 17.4 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the NKI15/16-XL?", "a": "The basic dynamic load rating C is 14.7 kN and the basic static load rating C0 is 17.4 kN; the fatigue load limit Cur is 3.25 kN." }, { "q": "What is the maximum speed of the NKI15/16-XL?", "a": "The limiting speed is 21,600 r/min and the thermal reference speed is 12,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI15/16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 15 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI15-16", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NKI15-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI15-16-XL", "NKI15/16-XL" ], "locale_variants": {} }, { "sku": "NKI15-20-XL", "brand": "FAG", "manufacturer_designation": "NKI15/20-XL", "series": "nki-series", "type": "needle", "d_mm": 15, "D_mm": 27, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 18.7, "static_load_kN": 23.6, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 21600, "max_rpm": 21600, "reference_speed_rpm": 12100, "weight_g": 48.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×27×20 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 18.7 kN and C0 23.6 kN at the 15 mm seat; the C/C0 ratio of 0.79 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 27 mm outside diameter the fatigue load limit Cur is 4.2 kN, the limiting speed 21,600 r/min and the thermal reference speed 12,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.25 kN/mm and per millimetre of width 0.93 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 48.7 g, just 0.09 g per mm² of projected 27×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 15 mm bore this size balances the 27 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 6.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 18.7 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 15 mm bore; the 23.6 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 27 mm outside diameter and 18.7 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 15 mm seat, and in textile machine heald and cam shafts the 48.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 23.6 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI15/20-XL?", "a": "The NKI15/20-XL is a NKI machined-ring needle roller bearing with inner ring with 27 mm outside diameter, 15 mm bore and 20 mm width, envelope 15×27×20 mm. Mass is 48.7 g." }, { "q": "What does the NKI15/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI15/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×27×20 mm and the catalogue ratings are C 18.7 kN, C0 23.6 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the NKI15/20-XL?", "a": "The basic dynamic load rating C is 18.7 kN and the basic static load rating C0 is 23.6 kN; the fatigue load limit Cur is 4.2 kN." }, { "q": "What is the maximum speed of the NKI15/20-XL?", "a": "The limiting speed is 21,600 r/min and the thermal reference speed is 12,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI15/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 15 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI15-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI15-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×27×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI15-20-XL", "NKI15/20-XL" ], "locale_variants": {} }, { "sku": "NA4902-XL", "brand": "FAG", "manufacturer_designation": "NA4902-XL", "series": "na49-series", "type": "needle", "d_mm": 15, "D_mm": 28, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12, "static_load_kN": 13.6, "fatigue_load_limit_kN": 2.47, "limiting_speed_rpm": 21100, "max_rpm": 21100, "reference_speed_rpm": 11200, "weight_g": 34, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×28×13 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 12 kN and C0 13.6 kN at the 15 mm seat; the C/C0 ratio of 0.88 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.47 kN, the limiting speed 21,100 r/min and the thermal reference speed 11,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.80 kN/mm and per millimetre of width 0.92 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 34 g, just 0.09 g per mm² of projected 28×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 15 mm bore the 13 mm width and 12 kN C rating suit high-cycle industrial machinery rather than instrument duty This is the choice for OEM production on soft shafts: machine the 15 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 12 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 21,100 r/min limit. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 28 mm outside diameter and 12 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 15 mm seat, and in motorcycle and light-vehicle transmissions the 34 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 13 mm width and the published 13.6 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4902-XL?", "a": "The NA4902-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 28 mm outside diameter, 15 mm bore and 13 mm width, envelope 15×28×13 mm. Mass is 34 g." }, { "q": "What does the NA4902-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4902-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×28×13 mm and the catalogue ratings are C 12 kN, C0 13.6 kN, Cur 2.47 kN." }, { "q": "What is the load capacity of the NA4902-XL?", "a": "The basic dynamic load rating C is 12 kN and the basic static load rating C0 is 13.6 kN; the fatigue load limit Cur is 2.47 kN." }, { "q": "What is the maximum speed of the NA4902-XL?", "a": "The limiting speed is 21,100 r/min and the thermal reference speed is 11,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4902-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 15 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4902", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4902-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4902-XL", "NA4902-XL" ], "locale_variants": {} }, { "sku": "NA6902-XL", "brand": "FAG", "manufacturer_designation": "NA6902-XL", "series": "na69-series", "type": "needle", "d_mm": 15, "D_mm": 28, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 19.5, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 21100, "max_rpm": 21100, "reference_speed_rpm": 10900, "weight_g": 63.6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×28×23 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 19.5 kN and C0 25.5 kN at the 15 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 4.55 kN, the limiting speed 21,100 r/min and the thermal reference speed 10,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.30 kN/mm and per millimetre of width 0.85 kN/mm — the reason 23 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 63.6 g, just 0.10 g per mm² of projected 28×23 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 15 mm bore this size balances the 28 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range NA6902-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Cur 4.55 kN, limiting speed 21,100 r/min, reference speed 10,900 r/min — the inner ring adds a few grams (total 63.6 g) but removes the hardening requirement The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 15×28×23 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 28 mm outside diameter and 19.5 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 15 mm seat, and in planetary gear bearings the 63.6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 23 mm width and the published 25.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA6902-XL?", "a": "The NA6902-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 28 mm outside diameter, 15 mm bore and 23 mm width, envelope 15×28×23 mm. Mass is 63.6 g." }, { "q": "What does the NA6902-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6902-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×28×23 mm and the catalogue ratings are C 19.5 kN, C0 25.5 kN, Cur 4.55 kN." }, { "q": "What is the load capacity of the NA6902-XL?", "a": "The basic dynamic load rating C is 19.5 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.55 kN." }, { "q": "What is the maximum speed of the NA6902-XL?", "a": "The limiting speed is 21,100 r/min and the thermal reference speed is 10,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6902-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 15 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6902", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6902-XL", "NA6902-XL" ], "locale_variants": {} }, { "sku": "NKIS15-XL", "brand": "FAG", "manufacturer_designation": "NKIS15-XL", "series": "nkis-series", "type": "needle", "d_mm": 15, "D_mm": 35, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.5, "static_load_kN": 28, "fatigue_load_limit_kN": 5, "limiting_speed_rpm": 18500, "max_rpm": 18500, "reference_speed_rpm": 9400, "weight_g": 92, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×20 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 28 kN at the 15 mm seat; the C/C0 ratio of 0.98 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 5 kN, the limiting speed 18,500 r/min and the thermal reference speed 9,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.83 kN/mm and per millimetre of width 1.38 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 92 g, just 0.13 g per mm² of projected 35×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 15 mm bore the 20 mm width and 27.5 kN C rating suit high-cycle industrial machinery rather than instrument duty NKIS15-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required This is the choice for OEM production on soft shafts: machine the 15 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 18,500 r/min limit. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 35 mm outside diameter and 27.5 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 15 mm seat, and in two-stroke and compressor piston pins the 92 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 20 mm width and the published 28 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKIS15-XL?", "a": "The NKIS15-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 35 mm outside diameter, 15 mm bore and 20 mm width, envelope 15×35×20 mm. Mass is 92 g." }, { "q": "What does the NKIS15-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS15-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×35×20 mm and the catalogue ratings are C 27.5 kN, C0 28 kN, Cur 5 kN." }, { "q": "What is the load capacity of the NKIS15-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 28 kN; the fatigue load limit Cur is 5 kN." }, { "q": "What is the maximum speed of the NKIS15-XL?", "a": "The limiting speed is 18,500 r/min and the thermal reference speed is 9,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS15-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 15 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS15", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS15-XL", "NKIS15-XL" ], "locale_variants": {} }, { "sku": "NKI17-16-XL", "brand": "FAG", "manufacturer_designation": "NKI17/16-XL", "series": "nki-series", "type": "needle", "d_mm": 17, "D_mm": 29, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.2, "static_load_kN": 18.7, "fatigue_load_limit_kN": 3.5, "limiting_speed_rpm": 20600, "max_rpm": 20600, "reference_speed_rpm": 11400, "weight_g": 42.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×29×16 mm: 17 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 15.2 kN and C0 18.7 kN at the 17 mm seat; the C/C0 ratio of 0.81 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 29 mm outside diameter the fatigue load limit Cur is 3.5 kN, the limiting speed 20,600 r/min and the thermal reference speed 11,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.89 kN/mm and per millimetre of width 0.95 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 42.4 g, just 0.09 g per mm² of projected 29×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 17 mm bore the 16 mm width and 15.2 kN C rating suit high-cycle industrial machinery rather than instrument duty Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 15.2 kN C The integral inner ring brings the bore to 17 mm inside the 29×16 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.5 kN Cur value. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 29 mm outside diameter and 15.2 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 17 mm seat, and in planetary gear bearings the 42.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 16 mm width and the published 18.7 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NKI17/16-XL?", "a": "The NKI17/16-XL is a NKI machined-ring needle roller bearing with inner ring with 29 mm outside diameter, 17 mm bore and 16 mm width, envelope 17×29×16 mm. Mass is 42.4 g." }, { "q": "What does the NKI17/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI17/16-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×29×16 mm and the catalogue ratings are C 15.2 kN, C0 18.7 kN, Cur 3.5 kN." }, { "q": "What is the load capacity of the NKI17/16-XL?", "a": "The basic dynamic load rating C is 15.2 kN and the basic static load rating C0 is 18.7 kN; the fatigue load limit Cur is 3.5 kN." }, { "q": "What is the maximum speed of the NKI17/16-XL?", "a": "The limiting speed is 20,600 r/min and the thermal reference speed is 11,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI17/16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 17 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI17-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×29×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI17-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI17-16-XL", "NKI17/16-XL" ], "locale_variants": {} }, { "sku": "NKI17-20-XL", "brand": "FAG", "manufacturer_designation": "NKI17/20-XL", "series": "nki-series", "type": "needle", "d_mm": 17, "D_mm": 29, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 19.3, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.5, "limiting_speed_rpm": 20600, "max_rpm": 20600, "reference_speed_rpm": 11200, "weight_g": 53.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×29×20 mm: 17 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 19.3 kN and C0 25.5 kN at the 17 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 29 mm outside diameter the fatigue load limit Cur is 4.5 kN, the limiting speed 20,600 r/min and the thermal reference speed 11,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.14 kN/mm and per millimetre of width 0.97 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 53.4 g, just 0.09 g per mm² of projected 29×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 17 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty NKI17/20-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 19.3 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 17 mm bore; the 25.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 29 mm outside diameter and 19.3 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 17 mm seat, and in copying and printing machine mechanisms the 53.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 25.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI17/20-XL?", "a": "The NKI17/20-XL is a NKI machined-ring needle roller bearing with inner ring with 29 mm outside diameter, 17 mm bore and 20 mm width, envelope 17×29×20 mm. Mass is 53.4 g." }, { "q": "What does the NKI17/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI17/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×29×20 mm and the catalogue ratings are C 19.3 kN, C0 25.5 kN, Cur 4.5 kN." }, { "q": "What is the load capacity of the NKI17/20-XL?", "a": "The basic dynamic load rating C is 19.3 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.5 kN." }, { "q": "What is the maximum speed of the NKI17/20-XL?", "a": "The limiting speed is 20,600 r/min and the thermal reference speed is 11,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI17/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 17 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI17-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI17-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×29×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI17-20-XL", "NKI17/20-XL" ], "locale_variants": {} }, { "sku": "NA4903-XL", "brand": "FAG", "manufacturer_designation": "NA4903-XL", "series": "na49-series", "type": "needle", "d_mm": 17, "D_mm": 30, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 12.4, "static_load_kN": 14.6, "fatigue_load_limit_kN": 2.65, "limiting_speed_rpm": 20000, "max_rpm": 20000, "reference_speed_rpm": 10200, "weight_g": 37, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×30×13 mm: 17 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 12.4 kN and C0 14.6 kN at the 17 mm seat; the C/C0 ratio of 0.85 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 2.65 kN, the limiting speed 20,000 r/min and the thermal reference speed 10,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.73 kN/mm and per millimetre of width 0.95 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 37 g, just 0.09 g per mm² of projected 30×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 17 mm bore the 13 mm width and 12.4 kN C rating suit high-cycle industrial machinery rather than instrument duty Cur 2.65 kN, limiting speed 20,000 r/min, reference speed 10,200 r/min — the inner ring adds a few grams (total 37 g) but removes the hardening requirement The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 14.6 kN C0 rating still assumes full rigid support under both rings The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 20,000 r/min limit. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 30 mm outside diameter and 12.4 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 17 mm seat, and in small electric motor accessory drives the 37 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 13 mm width and the published 14.6 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA4903-XL?", "a": "The NA4903-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 30 mm outside diameter, 17 mm bore and 13 mm width, envelope 17×30×13 mm. Mass is 37 g." }, { "q": "What does the NA4903-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4903-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×30×13 mm and the catalogue ratings are C 12.4 kN, C0 14.6 kN, Cur 2.65 kN." }, { "q": "What is the load capacity of the NA4903-XL?", "a": "The basic dynamic load rating C is 12.4 kN and the basic static load rating C0 is 14.6 kN; the fatigue load limit Cur is 2.65 kN." }, { "q": "What is the maximum speed of the NA4903-XL?", "a": "The limiting speed is 20,000 r/min and the thermal reference speed is 10,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4903-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 17 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4903", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4903-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4903-XL", "NA4903-XL" ], "locale_variants": {} }, { "sku": "NA6903-XL", "brand": "FAG", "manufacturer_designation": "NA6903-XL", "series": "na69-series", "type": "needle", "d_mm": 17, "D_mm": 30, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.1, "static_load_kN": 29, "fatigue_load_limit_kN": 5.2, "limiting_speed_rpm": 20000, "max_rpm": 20000, "reference_speed_rpm": 9800, "weight_g": 72, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×30×23 mm: 17 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 21.1 kN and C0 29 kN at the 17 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 5.2 kN, the limiting speed 20,000 r/min and the thermal reference speed 9,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.24 kN/mm and per millimetre of width 0.92 kN/mm — the reason 23 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 72 g, just 0.10 g per mm² of projected 30×23 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 17 mm bore this size balances the 30 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range This is the choice for OEM production on soft shafts: machine the 17 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway Cur 5.2 kN, limiting speed 20,000 r/min, reference speed 9,800 r/min — the inner ring adds a few grams (total 72 g) but removes the hardening requirement The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 17×30×23 mm envelope. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 30 mm outside diameter and 21.1 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 17 mm seat, and in hydraulic and pneumatic pump eccentrics the 72 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 23 mm width and the published 29 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA6903-XL?", "a": "The NA6903-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 30 mm outside diameter, 17 mm bore and 23 mm width, envelope 17×30×23 mm. Mass is 72 g." }, { "q": "What does the NA6903-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6903-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×30×23 mm and the catalogue ratings are C 21.1 kN, C0 29 kN, Cur 5.2 kN." }, { "q": "What is the load capacity of the NA6903-XL?", "a": "The basic dynamic load rating C is 21.1 kN and the basic static load rating C0 is 29 kN; the fatigue load limit Cur is 5.2 kN." }, { "q": "What is the maximum speed of the NA6903-XL?", "a": "The limiting speed is 20,000 r/min and the thermal reference speed is 9,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6903-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 17 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6903", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6903-XL", "NA6903-XL" ], "locale_variants": {} }, { "sku": "NKIS17-XL", "brand": "FAG", "manufacturer_designation": "NKIS17-XL", "series": "nkis-series", "type": "needle", "d_mm": 17, "D_mm": 37, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 29.5, "static_load_kN": 31, "fatigue_load_limit_kN": 5.5, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 8800, "weight_g": 98, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×37×20 mm: 17 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 29.5 kN and C0 31 kN at the 17 mm seat; the C/C0 ratio of 0.95 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 5.5 kN, the limiting speed 17,200 r/min and the thermal reference speed 8,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.74 kN/mm and per millimetre of width 1.48 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 98 g, just 0.13 g per mm² of projected 37×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 17 mm bore the 20 mm width and 29.5 kN C rating suit high-cycle industrial machinery rather than instrument duty Reading the NKIS prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 29.5 kN C Cur 5.5 kN, limiting speed 17,200 r/min, reference speed 8,800 r/min — the inner ring adds a few grams (total 98 g) but removes the hardening requirement The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 17,200 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 37 mm outside diameter and 29.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 17 mm seat, and in hydraulic and pneumatic pump eccentrics the 98 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 31 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKIS17-XL?", "a": "The NKIS17-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 37 mm outside diameter, 17 mm bore and 20 mm width, envelope 17×37×20 mm. Mass is 98 g." }, { "q": "What does the NKIS17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS17-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×37×20 mm and the catalogue ratings are C 29.5 kN, C0 31 kN, Cur 5.5 kN." }, { "q": "What is the load capacity of the NKIS17-XL?", "a": "The basic dynamic load rating C is 29.5 kN and the basic static load rating C0 is 31 kN; the fatigue load limit Cur is 5.5 kN." }, { "q": "What is the maximum speed of the NKIS17-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 8,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS17-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 17 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS17", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×37×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS17-XL", "NKIS17-XL" ], "locale_variants": {} }, { "sku": "NKI20-16-XL", "brand": "FAG", "manufacturer_designation": "NKI20/16-XL", "series": "nki-series", "type": "needle", "d_mm": 20, "D_mm": 32, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.9, "static_load_kN": 22.3, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 18500, "max_rpm": 18500, "reference_speed_rpm": 10100, "weight_g": 49, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×32×16 mm: 20 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 16.9 kN and C0 22.3 kN at the 20 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 4.2 kN, the limiting speed 18,500 r/min and the thermal reference speed 10,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.84 kN/mm and per millimetre of width 1.06 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 49 g, just 0.10 g per mm² of projected 32×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 16 mm width and 16.9 kN C rating suit high-cycle industrial machinery rather than instrument duty This is the choice for OEM production on soft shafts: machine the 20 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 18,500 r/min limit. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 32 mm outside diameter and 16.9 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 20 mm seat, and in small electric motor accessory drives the 49 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 16 mm width and the published 22.3 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NKI20/16-XL?", "a": "The NKI20/16-XL is a NKI machined-ring needle roller bearing with inner ring with 32 mm outside diameter, 20 mm bore and 16 mm width, envelope 20×32×16 mm. Mass is 49 g." }, { "q": "What does the NKI20/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI20/16-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×32×16 mm and the catalogue ratings are C 16.9 kN, C0 22.3 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the NKI20/16-XL?", "a": "The basic dynamic load rating C is 16.9 kN and the basic static load rating C0 is 22.3 kN; the fatigue load limit Cur is 4.2 kN." }, { "q": "What is the maximum speed of the NKI20/16-XL?", "a": "The limiting speed is 18,500 r/min and the thermal reference speed is 10,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI20/16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 20 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI20-16", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NKI20-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI20-16-XL", "NKI20/16-XL" ], "locale_variants": {} }, { "sku": "NKI20-20-XL", "brand": "FAG", "manufacturer_designation": "NKI20/20-XL", "series": "nki-series", "type": "needle", "d_mm": 20, "D_mm": 32, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.4, "static_load_kN": 30.5, "fatigue_load_limit_kN": 8.1, "limiting_speed_rpm": 18500, "max_rpm": 18500, "reference_speed_rpm": 9900, "weight_g": 61, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×32×20 mm: 20 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 21.4 kN and C0 30.5 kN at the 20 mm seat; the C/C0 ratio of 0.70 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 8.1 kN, the limiting speed 18,500 r/min and the thermal reference speed 9,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.07 kN/mm and per millimetre of width 1.07 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 61 g, just 0.10 g per mm² of projected 32×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The integral inner ring brings the bore to 20 mm inside the 32×20 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing This is the choice for OEM production on soft shafts: machine the 20 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 21.4 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 32 mm outside diameter and 21.4 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 20 mm seat, and in two-stroke and compressor piston pins the 61 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 20 mm width and the published 30.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKI20/20-XL?", "a": "The NKI20/20-XL is a NKI machined-ring needle roller bearing with inner ring with 32 mm outside diameter, 20 mm bore and 20 mm width, envelope 20×32×20 mm. Mass is 61 g." }, { "q": "What does the NKI20/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI20/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×32×20 mm and the catalogue ratings are C 21.4 kN, C0 30.5 kN, Cur 8.1 kN." }, { "q": "What is the load capacity of the NKI20/20-XL?", "a": "The basic dynamic load rating C is 21.4 kN and the basic static load rating C0 is 30.5 kN; the fatigue load limit Cur is 8.1 kN." }, { "q": "What is the maximum speed of the NKI20/20-XL?", "a": "The limiting speed is 18,500 r/min and the thermal reference speed is 9,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI20/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 20 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI20-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI20-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×32×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI20-20-XL", "NKI20/20-XL" ], "locale_variants": {} }, { "sku": "NA4904-XL", "brand": "FAG", "manufacturer_designation": "NA4904-XL", "series": "na49-series", "type": "needle", "d_mm": 20, "D_mm": 37, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.7, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.7, "limiting_speed_rpm": 16900, "max_rpm": 16900, "reference_speed_rpm": 9400, "weight_g": 75.2, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×37×17 mm: 20 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 23.7 kN and C0 25.5 kN at the 20 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 4.7 kN, the limiting speed 16,900 r/min and the thermal reference speed 9,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.19 kN/mm and per millimetre of width 1.39 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 75.2 g, just 0.12 g per mm² of projected 37×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 20 mm bore this size balances the 37 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 8.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel NA4904-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 16,900 r/min limit. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 37 mm outside diameter and 23.7 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 20 mm seat, and in gearbox selector and change linkages the 75.2 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 17 mm width and the published 25.5 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NA4904-XL?", "a": "The NA4904-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 37 mm outside diameter, 20 mm bore and 17 mm width, envelope 20×37×17 mm. Mass is 75.2 g." }, { "q": "What does the NA4904-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4904-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×37×17 mm and the catalogue ratings are C 23.7 kN, C0 25.5 kN, Cur 4.7 kN." }, { "q": "What is the load capacity of the NA4904-XL?", "a": "The basic dynamic load rating C is 23.7 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.7 kN." }, { "q": "What is the maximum speed of the NA4904-XL?", "a": "The limiting speed is 16,900 r/min and the thermal reference speed is 9,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4904-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 20 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4904", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NA4904-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4904-XL", "NA4904-XL" ], "locale_variants": {} }, { "sku": "NA6904-XL", "brand": "FAG", "manufacturer_designation": "NA6904-XL", "series": "na69-series", "type": "needle", "d_mm": 20, "D_mm": 37, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 40.5, "static_load_kN": 51, "fatigue_load_limit_kN": 9.2, "limiting_speed_rpm": 16900, "max_rpm": 16900, "reference_speed_rpm": 8900, "weight_g": 141, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×37×30 mm: 20 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 40.5 kN and C0 51 kN at the 20 mm seat; the C/C0 ratio of 0.79 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 9.2 kN, the limiting speed 16,900 r/min and the thermal reference speed 8,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.02 kN/mm and per millimetre of width 1.35 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 141 g, just 0.13 g per mm² of projected 37×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 40.5 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 16,900 r/min limit. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 37 mm outside diameter and 40.5 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 20 mm seat, and in rocker arms and valve trains the 141 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 30 mm width and the published 51 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA6904-XL?", "a": "The NA6904-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 37 mm outside diameter, 20 mm bore and 30 mm width, envelope 20×37×30 mm. Mass is 141 g." }, { "q": "What does the NA6904-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6904-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×37×30 mm and the catalogue ratings are C 40.5 kN, C0 51 kN, Cur 9.2 kN." }, { "q": "What is the load capacity of the NA6904-XL?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 51 kN; the fatigue load limit Cur is 9.2 kN." }, { "q": "What is the maximum speed of the NA6904-XL?", "a": "The limiting speed is 16,900 r/min and the thermal reference speed is 8,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6904-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 20 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6904", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×37×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6904-XL", "NA6904-XL" ], "locale_variants": {} }, { "sku": "NKIS20-XL", "brand": "FAG", "manufacturer_designation": "NKIS20-XL", "series": "nkis-series", "type": "needle", "d_mm": 20, "D_mm": 42, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 6.5, "limiting_speed_rpm": 15100, "max_rpm": 15100, "reference_speed_rpm": 7700, "weight_g": 129, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×42×20 mm: 20 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 32.5 kN and C0 36.5 kN at the 20 mm seat; the C/C0 ratio of 0.89 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 6.5 kN, the limiting speed 15,100 r/min and the thermal reference speed 7,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.63 kN/mm and per millimetre of width 1.63 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 129 g, just 0.15 g per mm² of projected 42×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 20 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The 11.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel Reading the NKIS prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 32.5 kN C The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 20×42×20 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 42 mm outside diameter and 32.5 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 20 mm seat, and in copying and printing machine mechanisms the 129 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 36.5 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKIS20-XL?", "a": "The NKIS20-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 42 mm outside diameter, 20 mm bore and 20 mm width, envelope 20×42×20 mm. Mass is 129 g." }, { "q": "What does the NKIS20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS20-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×42×20 mm and the catalogue ratings are C 32.5 kN, C0 36.5 kN, Cur 6.5 kN." }, { "q": "What is the load capacity of the NKIS20-XL?", "a": "The basic dynamic load rating C is 32.5 kN and the basic static load rating C0 is 36.5 kN; the fatigue load limit Cur is 6.5 kN." }, { "q": "What is the maximum speed of the NKIS20-XL?", "a": "The limiting speed is 15,100 r/min and the thermal reference speed is 7,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 20 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS20", "equiv_brand": "SKF", "level": "partial", "note": "Same 20×42×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=959", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS20-XL", "NKIS20-XL" ], "locale_variants": {} }, { "sku": "NKI22-16-XL", "brand": "FAG", "manufacturer_designation": "NKI22/16-XL", "series": "nki-series", "type": "needle", "d_mm": 22, "D_mm": 34, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 17.3, "static_load_kN": 23.6, "fatigue_load_limit_kN": 4.45, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 9500, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×34×16 mm: 22 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 17.3 kN and C0 23.6 kN at the 22 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 34 mm outside diameter the fatigue load limit Cur is 4.45 kN, the limiting speed 17,200 r/min and the thermal reference speed 9,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.79 kN/mm and per millimetre of width 1.08 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 52 g, just 0.10 g per mm² of projected 34×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 22 mm bore this size balances the 34 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 6.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 22×34×16 mm envelope. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 34 mm outside diameter and 17.3 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 22 mm seat, and in hydraulic and pneumatic pump eccentrics the 52 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 16 mm width and the published 23.6 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI22/16-XL?", "a": "The NKI22/16-XL is a NKI machined-ring needle roller bearing with inner ring with 34 mm outside diameter, 22 mm bore and 16 mm width, envelope 22×34×16 mm. Mass is 52 g." }, { "q": "What does the NKI22/16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI22/16-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×34×16 mm and the catalogue ratings are C 17.3 kN, C0 23.6 kN, Cur 4.45 kN." }, { "q": "What is the load capacity of the NKI22/16-XL?", "a": "The basic dynamic load rating C is 17.3 kN and the basic static load rating C0 is 23.6 kN; the fatigue load limit Cur is 4.45 kN." }, { "q": "What is the maximum speed of the NKI22/16-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 9,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI22/16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 22 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI22-16", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×34×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI22-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI22-16-XL", "NKI22/16-XL" ], "locale_variants": {} }, { "sku": "NKI22-20-XL", "brand": "FAG", "manufacturer_designation": "NKI22/20-XL", "series": "nki-series", "type": "needle", "d_mm": 22, "D_mm": 34, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22, "static_load_kN": 32, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 9300, "weight_g": 65.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×34×20 mm: 22 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 22 kN and C0 32 kN at the 22 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 34 mm outside diameter the fatigue load limit Cur is 5.7 kN, the limiting speed 17,200 r/min and the thermal reference speed 9,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.00 kN/mm and per millimetre of width 1.10 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 65.4 g, just 0.10 g per mm² of projected 34×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 22 mm bore the 20 mm width and 22 kN C rating suit high-cycle industrial machinery rather than instrument duty NKI22/20-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 32 kN C0 rating still assumes full rigid support under both rings -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 22 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 34 mm outside diameter and 22 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 22 mm seat, and in textile machine heald and cam shafts the 65.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 20 mm width and the published 32 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI22/20-XL?", "a": "The NKI22/20-XL is a NKI machined-ring needle roller bearing with inner ring with 34 mm outside diameter, 22 mm bore and 20 mm width, envelope 22×34×20 mm. Mass is 65.4 g." }, { "q": "What does the NKI22/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI22/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×34×20 mm and the catalogue ratings are C 22 kN, C0 32 kN, Cur 5.7 kN." }, { "q": "What is the load capacity of the NKI22/20-XL?", "a": "The basic dynamic load rating C is 22 kN and the basic static load rating C0 is 32 kN; the fatigue load limit Cur is 5.7 kN." }, { "q": "What is the maximum speed of the NKI22/20-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 9,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI22/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 22 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI22-16", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI22-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×34×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI22-20-XL", "NKI22/20-XL" ], "locale_variants": {} }, { "sku": "NA49-22-XL", "brand": "FAG", "manufacturer_designation": "NA49/22-XL", "series": "na49-series", "type": "needle", "d_mm": 22, "D_mm": 39, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 29.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 8100, "weight_g": 80, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×39×17 mm: 22 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 26 kN and C0 29.5 kN at the 22 mm seat; the C/C0 ratio of 0.88 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 39 mm outside diameter the fatigue load limit Cur is 5.4 kN, the limiting speed 15,300 r/min and the thermal reference speed 8,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.18 kN/mm and per millimetre of width 1.53 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 80 g, just 0.12 g per mm² of projected 39×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 22 mm bore the 17 mm width and 26 kN C rating suit high-cycle industrial machinery rather than instrument duty Cur 5.4 kN, limiting speed 15,300 r/min, reference speed 8,100 r/min — the inner ring adds a few grams (total 80 g) but removes the hardening requirement The integral inner ring brings the bore to 22 mm inside the 39×17 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 22×39×17 mm envelope. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 39 mm outside diameter and 26 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 22 mm seat, and in gearbox selector and change linkages the 80 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 17 mm width and the published 29.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NA49/22-XL?", "a": "The NA49/22-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 39 mm outside diameter, 22 mm bore and 17 mm width, envelope 22×39×17 mm. Mass is 80 g." }, { "q": "What does the NA49/22-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA49/22-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×39×17 mm and the catalogue ratings are C 26 kN, C0 29.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NA49/22-XL?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 29.5 kN; the fatigue load limit Cur is 5.4 kN." }, { "q": "What is the maximum speed of the NA49/22-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 8,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA49/22-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 22 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA49-22", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×39×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA49-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA49-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA49-22-XL", "NA49/22-XL" ], "locale_variants": {} }, { "sku": "NA69-22-XL", "brand": "FAG", "manufacturer_designation": "NA69/22-XL", "series": "na69-series", "type": "needle", "d_mm": 22, "D_mm": 39, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 55, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 7900, "weight_g": 150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×39×30 mm: 22 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 42 kN and C0 55 kN at the 22 mm seat; the C/C0 ratio of 0.76 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 39 mm outside diameter the fatigue load limit Cur is 10 kN, the limiting speed 15,300 r/min and the thermal reference speed 7,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.91 kN/mm and per millimetre of width 1.40 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 150 g, just 0.13 g per mm² of projected 39×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 22 mm bore this size balances the 39 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range NA69/22-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 55 kN C0 rating still assumes full rigid support under both rings X-life status (-XL) indicates the current Schaeffler premium execution at 22 mm bore; the 55 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 39 mm outside diameter and 42 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 22 mm seat, and in connecting-rod small ends the 150 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 55 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA69/22-XL?", "a": "The NA69/22-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 39 mm outside diameter, 22 mm bore and 30 mm width, envelope 22×39×30 mm. Mass is 150 g." }, { "q": "What does the NA69/22-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA69/22-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×39×30 mm and the catalogue ratings are C 42 kN, C0 55 kN, Cur 10 kN." }, { "q": "What is the load capacity of the NA69/22-XL?", "a": "The basic dynamic load rating C is 42 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 10 kN." }, { "q": "What is the maximum speed of the NA69/22-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 7,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA69/22-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 22 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA69-22", "equiv_brand": "SKF", "level": "partial", "note": "Same 22×39×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA69-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA69-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA69-22-XL", "NA69/22-XL" ], "locale_variants": {} }, { "sku": "NKI25-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI25/20-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 25, "D_mm": 38, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 27.5, "static_load_kN": 39, "fatigue_load_limit_kN": 7, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 8100, "weight_g": 75.8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×38×20 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 39 kN at the 25 mm seat; the C/C0 ratio of 0.71 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 38 mm outside diameter the fatigue load limit Cur is 7 kN, the limiting speed 15,300 r/min and the thermal reference speed 8,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.10 kN/mm and per millimetre of width 1.38 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 75.8 g, just 0.10 g per mm² of projected 38×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 39 kN C0 rating still assumes full rigid support under both rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 7 kN Cur value. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 15,300 r/min limiting speed without roller-to-roller sliding. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 38 mm outside diameter and 27.5 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 25 mm seat, and in copying and printing machine mechanisms the 75.8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 39 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI25/20-TV-XL?", "a": "The NKI25/20-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 38 mm outside diameter, 25 mm bore and 20 mm width, envelope 25×38×20 mm. Mass is 75.8 g." }, { "q": "What does the NKI25/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI25/20-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×38×20 mm and the catalogue ratings are C 27.5 kN, C0 39 kN, Cur 7 kN." }, { "q": "What is the load capacity of the NKI25/20-TV-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 39 kN; the fatigue load limit Cur is 7 kN." }, { "q": "What is the maximum speed of the NKI25/20-TV-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 8,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI25/20-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI25-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×38×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI25-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI25-20-TV-XL", "NKI25/20-TV-XL" ], "locale_variants": {} }, { "sku": "NKI25-30-XL", "brand": "FAG", "manufacturer_designation": "NKI25/30-XL", "series": "nki-series", "type": "needle", "d_mm": 25, "D_mm": 38, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 57, "fatigue_load_limit_kN": 10.7, "limiting_speed_rpm": 15300, "max_rpm": 15300, "reference_speed_rpm": 8200, "weight_g": 124, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×38×30 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 37 kN and C0 57 kN at the 25 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 38 mm outside diameter the fatigue load limit Cur is 10.7 kN, the limiting speed 15,300 r/min and the thermal reference speed 8,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.48 kN/mm and per millimetre of width 1.23 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 124 g, just 0.11 g per mm² of projected 38×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty This is the choice for OEM production on soft shafts: machine the 25 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 57 kN C0 rating still assumes full rigid support under both rings -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 37 kN C rating and longer nominal life come without an envelope change. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 38 mm outside diameter and 37 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 25 mm seat, and in gearbox selector and change linkages the 124 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 57 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI25/30-XL?", "a": "The NKI25/30-XL is a NKI machined-ring needle roller bearing with inner ring with 38 mm outside diameter, 25 mm bore and 30 mm width, envelope 25×38×30 mm. Mass is 124 g." }, { "q": "What does the NKI25/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI25/30-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×38×30 mm and the catalogue ratings are C 37 kN, C0 57 kN, Cur 10.7 kN." }, { "q": "What is the load capacity of the NKI25/30-XL?", "a": "The basic dynamic load rating C is 37 kN and the basic static load rating C0 is 57 kN; the fatigue load limit Cur is 10.7 kN." }, { "q": "What is the maximum speed of the NKI25/30-XL?", "a": "The limiting speed is 15,300 r/min and the thermal reference speed is 8,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI25/30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI25-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI25-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×38×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI25-30-XL", "NKI25/30-XL" ], "locale_variants": {} }, { "sku": "NA4905-XL", "brand": "FAG", "manufacturer_designation": "NA4905-XL", "series": "na49-series", "type": "needle", "d_mm": 25, "D_mm": 42, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26.5, "static_load_kN": 31.5, "fatigue_load_limit_kN": 5.8, "limiting_speed_rpm": 14400, "max_rpm": 14400, "reference_speed_rpm": 7700, "weight_g": 88, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×42×17 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 26.5 kN and C0 31.5 kN at the 25 mm seat; the C/C0 ratio of 0.84 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 5.8 kN, the limiting speed 14,400 r/min and the thermal reference speed 7,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.06 kN/mm and per millimetre of width 1.56 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 88 g, just 0.12 g per mm² of projected 42×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 25 mm bore this size balances the 42 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 26.5 kN C Cur 5.8 kN, limiting speed 14,400 r/min, reference speed 7,700 r/min — the inner ring adds a few grams (total 88 g) but removes the hardening requirement X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 31.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 42 mm outside diameter and 26.5 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 25 mm seat, and in two-stroke and compressor piston pins the 88 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 17 mm width and the published 31.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4905-XL?", "a": "The NA4905-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 42 mm outside diameter, 25 mm bore and 17 mm width, envelope 25×42×17 mm. Mass is 88 g." }, { "q": "What does the NA4905-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4905-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×42×17 mm and the catalogue ratings are C 26.5 kN, C0 31.5 kN, Cur 5.8 kN." }, { "q": "What is the load capacity of the NA4905-XL?", "a": "The basic dynamic load rating C is 26.5 kN and the basic static load rating C0 is 31.5 kN; the fatigue load limit Cur is 5.8 kN." }, { "q": "What is the maximum speed of the NA4905-XL?", "a": "The limiting speed is 14,400 r/min and the thermal reference speed is 7,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4905-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4905", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NA4905-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4905-XL", "NA4905-XL" ], "locale_variants": {} }, { "sku": "NA6905-XL", "brand": "FAG", "manufacturer_designation": "NA6905-XL", "series": "na69-series", "type": "needle", "d_mm": 25, "D_mm": 42, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44, "static_load_kN": 59, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 14400, "max_rpm": 14400, "reference_speed_rpm": 7500, "weight_g": 161, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×42×30 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 44 kN and C0 59 kN at the 25 mm seat; the C/C0 ratio of 0.75 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 10.8 kN, the limiting speed 14,400 r/min and the thermal reference speed 7,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.76 kN/mm and per millimetre of width 1.47 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 161 g, just 0.13 g per mm² of projected 42×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty NA6905-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 44 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 14,400 r/min limit. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 42 mm outside diameter and 44 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 25 mm seat, and in gearbox selector and change linkages the 161 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 59 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA6905-XL?", "a": "The NA6905-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 42 mm outside diameter, 25 mm bore and 30 mm width, envelope 25×42×30 mm. Mass is 161 g." }, { "q": "What does the NA6905-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6905-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×42×30 mm and the catalogue ratings are C 44 kN, C0 59 kN, Cur 10.8 kN." }, { "q": "What is the load capacity of the NA6905-XL?", "a": "The basic dynamic load rating C is 44 kN and the basic static load rating C0 is 59 kN; the fatigue load limit Cur is 10.8 kN." }, { "q": "What is the maximum speed of the NA6905-XL?", "a": "The limiting speed is 14,400 r/min and the thermal reference speed is 7,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6905-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6905", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×42×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6905-XL", "NA6905-XL" ], "locale_variants": {} }, { "sku": "NKIS25-XL", "brand": "FAG", "manufacturer_designation": "NKIS25-XL", "series": "nkis-series", "type": "needle", "d_mm": 25, "D_mm": 47, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38, "static_load_kN": 43.5, "fatigue_load_limit_kN": 7.6, "limiting_speed_rpm": 13200, "max_rpm": 13200, "reference_speed_rpm": 7100, "weight_g": 162, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×47×22 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 38 kN and C0 43.5 kN at the 25 mm seat; the C/C0 ratio of 0.87 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 7.6 kN, the limiting speed 13,200 r/min and the thermal reference speed 7,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.52 kN/mm and per millimetre of width 1.73 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 162 g, just 0.16 g per mm² of projected 47×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 25 mm bore the 22 mm width and 38 kN C rating suit high-cycle industrial machinery rather than instrument duty NKIS25-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required This is the choice for OEM production on soft shafts: machine the 25 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 13,200 r/min limit. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 47 mm outside diameter and 38 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 25 mm seat, and in rocker arms and valve trains the 162 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 22 mm width and the published 43.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKIS25-XL?", "a": "The NKIS25-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 47 mm outside diameter, 25 mm bore and 22 mm width, envelope 25×47×22 mm. Mass is 162 g." }, { "q": "What does the NKIS25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS25-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×47×22 mm and the catalogue ratings are C 38 kN, C0 43.5 kN, Cur 7.6 kN." }, { "q": "What is the load capacity of the NKIS25-XL?", "a": "The basic dynamic load rating C is 38 kN and the basic static load rating C0 is 43.5 kN; the fatigue load limit Cur is 7.6 kN." }, { "q": "What is the maximum speed of the NKIS25-XL?", "a": "The limiting speed is 13,200 r/min and the thermal reference speed is 7,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS25-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS25", "equiv_brand": "SKF", "level": "partial", "note": "Same 25×47×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS25-XL", "NKIS25-XL" ], "locale_variants": {} }, { "sku": "NKI28-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI28/20-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 28, "D_mm": 42, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 29.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 8, "limiting_speed_rpm": 14000, "max_rpm": 14000, "reference_speed_rpm": 7500, "weight_g": 92.4, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×42×20 mm: 28 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 29.5 kN and C0 44.5 kN at the 28 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 8 kN, the limiting speed 14,000 r/min and the thermal reference speed 7,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.05 kN/mm and per millimetre of width 1.48 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 92.4 g, just 0.11 g per mm² of projected 42×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 28 mm bore the 20 mm width and 29.5 kN C rating suit high-cycle industrial machinery rather than instrument duty The integral inner ring brings the bore to 28 mm inside the 42×20 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing NKI28/20-TV-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 8 kN Cur value. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 42 mm outside diameter and 29.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 28 mm seat, and in hydraulic and pneumatic pump eccentrics the 92.4 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 44.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI28/20-TV-XL?", "a": "The NKI28/20-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 42 mm outside diameter, 28 mm bore and 20 mm width, envelope 28×42×20 mm. Mass is 92.4 g." }, { "q": "What does the NKI28/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI28/20-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×42×20 mm and the catalogue ratings are C 29.5 kN, C0 44.5 kN, Cur 8 kN." }, { "q": "What is the load capacity of the NKI28/20-TV-XL?", "a": "The basic dynamic load rating C is 29.5 kN and the basic static load rating C0 is 44.5 kN; the fatigue load limit Cur is 8 kN." }, { "q": "What is the maximum speed of the NKI28/20-TV-XL?", "a": "The limiting speed is 14,000 r/min and the thermal reference speed is 7,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI28/20-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 28 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI28-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×42×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI28-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI28-20-TV-XL", "NKI28/20-TV-XL" ], "locale_variants": {} }, { "sku": "NKI28-30-XL", "brand": "FAG", "manufacturer_designation": "NKI28/30-XL", "series": "nki-series", "type": "needle", "d_mm": 28, "D_mm": 42, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 39, "static_load_kN": 63, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 14000, "max_rpm": 14000, "reference_speed_rpm": 7600, "weight_g": 146, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×42×30 mm: 28 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.0 mm radial section packed with small-diameter needle rollers C is 39 kN and C0 63 kN at the 28 mm seat; the C/C0 ratio of 0.62 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 11.9 kN, the limiting speed 14,000 r/min and the thermal reference speed 7,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.39 kN/mm and per millimetre of width 1.30 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 146 g, just 0.12 g per mm² of projected 42×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 28 mm bore the 30 mm width and 39 kN C rating suit high-cycle industrial machinery rather than instrument duty The integral inner ring brings the bore to 28 mm inside the 42×30 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 39 kN C As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11.9 kN Cur value. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 42 mm outside diameter and 39 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 28 mm seat, and in agricultural machine pivots and linkages the 146 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 63 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI28/30-XL?", "a": "The NKI28/30-XL is a NKI machined-ring needle roller bearing with inner ring with 42 mm outside diameter, 28 mm bore and 30 mm width, envelope 28×42×30 mm. Mass is 146 g." }, { "q": "What does the NKI28/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI28/30-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×42×30 mm and the catalogue ratings are C 39 kN, C0 63 kN, Cur 11.9 kN." }, { "q": "What is the load capacity of the NKI28/30-XL?", "a": "The basic dynamic load rating C is 39 kN and the basic static load rating C0 is 63 kN; the fatigue load limit Cur is 11.9 kN." }, { "q": "What is the maximum speed of the NKI28/30-XL?", "a": "The limiting speed is 14,000 r/min and the thermal reference speed is 7,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI28/30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 28 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI28-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI28-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×42×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI28-30-XL", "NKI28/30-XL" ], "locale_variants": {} }, { "sku": "NA49-28-XL", "brand": "FAG", "manufacturer_designation": "NA49/28-XL", "series": "na49-series", "type": "needle", "d_mm": 28, "D_mm": 45, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 13600, "max_rpm": 13600, "reference_speed_rpm": 7400, "weight_g": 97.7, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×45×17 mm: 28 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 33.5 kN at the 28 mm seat; the C/C0 ratio of 0.82 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 6.2 kN, the limiting speed 13,600 r/min and the thermal reference speed 7,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.98 kN/mm and per millimetre of width 1.62 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 97.7 g, just 0.13 g per mm² of projected 45×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 28 mm bore the 17 mm width and 27.5 kN C rating suit high-cycle industrial machinery rather than instrument duty This is the choice for OEM production on soft shafts: machine the 28 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway X-life status (-XL) indicates the current Schaeffler premium execution at 28 mm bore; the 33.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 45 mm outside diameter and 27.5 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 28 mm seat, and in textile machine heald and cam shafts the 97.7 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 17 mm width and the published 33.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NA49/28-XL?", "a": "The NA49/28-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 45 mm outside diameter, 28 mm bore and 17 mm width, envelope 28×45×17 mm. Mass is 97.7 g." }, { "q": "What does the NA49/28-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA49/28-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×45×17 mm and the catalogue ratings are C 27.5 kN, C0 33.5 kN, Cur 6.2 kN." }, { "q": "What is the load capacity of the NA49/28-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 6.2 kN." }, { "q": "What is the maximum speed of the NA49/28-XL?", "a": "The limiting speed is 13,600 r/min and the thermal reference speed is 7,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA49/28-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 28 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA49-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA49-28", "equiv_brand": "SKF", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NA49-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA49-28-XL", "NA49/28-XL" ], "locale_variants": {} }, { "sku": "NA69-28-XL", "brand": "FAG", "manufacturer_designation": "NA69/28-XL", "series": "na69-series", "type": "needle", "d_mm": 28, "D_mm": 45, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 63, "fatigue_load_limit_kN": 11.6, "limiting_speed_rpm": 13600, "max_rpm": 13600, "reference_speed_rpm": 7100, "weight_g": 182, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 28×45×30 mm: 28 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 45.5 kN and C0 63 kN at the 28 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 11.6 kN, the limiting speed 13,600 r/min and the thermal reference speed 7,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.63 kN/mm and per millimetre of width 1.52 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 182 g, just 0.13 g per mm² of projected 45×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 28 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty This is the choice for OEM production on soft shafts: machine the 28 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway Cur 11.6 kN, limiting speed 13,600 r/min, reference speed 7,100 r/min — the inner ring adds a few grams (total 182 g) but removes the hardening requirement -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 45.5 kN C rating and longer nominal life come without an envelope change. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 45 mm outside diameter and 45.5 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 28 mm seat, and in rocker arms and valve trains the 182 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 30 mm width and the published 63 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA69/28-XL?", "a": "The NA69/28-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 45 mm outside diameter, 28 mm bore and 30 mm width, envelope 28×45×30 mm. Mass is 182 g." }, { "q": "What does the NA69/28-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA69/28-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 28×45×30 mm and the catalogue ratings are C 45.5 kN, C0 63 kN, Cur 11.6 kN." }, { "q": "What is the load capacity of the NA69/28-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 63 kN; the fatigue load limit Cur is 11.6 kN." }, { "q": "What is the maximum speed of the NA69/28-XL?", "a": "The limiting speed is 13,600 r/min and the thermal reference speed is 7,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA69/28-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 28 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA69-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA69-28", "equiv_brand": "SKF", "level": "partial", "note": "Same 28×45×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA69-32", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA69-28-XL", "NA69/28-XL" ], "locale_variants": {} }, { "sku": "NKI30-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI30/20-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 30, "D_mm": 45, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 31, "static_load_kN": 48.5, "fatigue_load_limit_kN": 8.6, "limiting_speed_rpm": 12900, "max_rpm": 12900, "reference_speed_rpm": 6800, "weight_g": 108, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×45×20 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 31 kN and C0 48.5 kN at the 30 mm seat; the C/C0 ratio of 0.64 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 8.6 kN, the limiting speed 12,900 r/min and the thermal reference speed 6,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 1.55 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 108 g, just 0.12 g per mm² of projected 45×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 31 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 12,900 r/min limit. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 12,900 r/min. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 45 mm outside diameter and 31 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 30 mm seat, and in rocker arms and valve trains the 108 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 20 mm width and the published 48.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI30/20-TV-XL?", "a": "The NKI30/20-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 45 mm outside diameter, 30 mm bore and 20 mm width, envelope 30×45×20 mm. Mass is 108 g." }, { "q": "What does the NKI30/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI30/20-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×45×20 mm and the catalogue ratings are C 31 kN, C0 48.5 kN, Cur 8.6 kN." }, { "q": "What is the load capacity of the NKI30/20-TV-XL?", "a": "The basic dynamic load rating C is 31 kN and the basic static load rating C0 is 48.5 kN; the fatigue load limit Cur is 8.6 kN." }, { "q": "What is the maximum speed of the NKI30/20-TV-XL?", "a": "The limiting speed is 12,900 r/min and the thermal reference speed is 6,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI30/20-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI30-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×45×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI30-30-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI30-20-TV-XL", "NKI30/20-TV-XL" ], "locale_variants": {} }, { "sku": "NKI30-30-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI30/30-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 30, "D_mm": 45, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 46, "static_load_kN": 81, "fatigue_load_limit_kN": 15.3, "limiting_speed_rpm": 12900, "max_rpm": 12900, "reference_speed_rpm": 6600, "weight_g": 165, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×45×30 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 46 kN and C0 81 kN at the 30 mm seat; the C/C0 ratio of 0.57 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 15.3 kN, the limiting speed 12,900 r/min and the thermal reference speed 6,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.53 kN/mm and per millimetre of width 1.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 165 g, just 0.12 g per mm² of projected 45×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 30 mm width and 46 kN C rating suit high-cycle industrial machinery rather than instrument duty This is the choice for OEM production on soft shafts: machine the 30 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The integral inner ring brings the bore to 30 mm inside the 45×30 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 81 kN C0 rating reflects the improved rolling-contact geometry. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 165 g in the 45 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 45 mm outside diameter and 46 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 30 mm seat, and in planetary gear bearings the 165 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 81 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NKI30/30-TV-XL?", "a": "The NKI30/30-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 45 mm outside diameter, 30 mm bore and 30 mm width, envelope 30×45×30 mm. Mass is 165 g." }, { "q": "What does the NKI30/30-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI30/30-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×45×30 mm and the catalogue ratings are C 46 kN, C0 81 kN, Cur 15.3 kN." }, { "q": "What is the load capacity of the NKI30/30-TV-XL?", "a": "The basic dynamic load rating C is 46 kN and the basic static load rating C0 is 81 kN; the fatigue load limit Cur is 15.3 kN." }, { "q": "What is the maximum speed of the NKI30/30-TV-XL?", "a": "The limiting speed is 12,900 r/min and the thermal reference speed is 6,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI30/30-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI30-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI30-30-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×45×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI30-30-TV-XL", "NKI30/30-TV-XL" ], "locale_variants": {} }, { "sku": "NA4906-XL", "brand": "FAG", "manufacturer_designation": "NA4906-XL", "series": "na49-series", "type": "needle", "d_mm": 30, "D_mm": 47, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28.5, "static_load_kN": 35.5, "fatigue_load_limit_kN": 6.6, "limiting_speed_rpm": 12600, "max_rpm": 12600, "reference_speed_rpm": 6600, "weight_g": 101, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×47×17 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 28.5 kN and C0 35.5 kN at the 30 mm seat; the C/C0 ratio of 0.80 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 6.6 kN, the limiting speed 12,600 r/min and the thermal reference speed 6,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.95 kN/mm and per millimetre of width 1.68 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 101 g, just 0.13 g per mm² of projected 47×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 30 mm bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range This is the choice for OEM production on soft shafts: machine the 30 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 28.5 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 35.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 47 mm outside diameter and 28.5 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 30 mm seat, and in planetary gear bearings the 101 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 17 mm width and the published 35.5 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4906-XL?", "a": "The NA4906-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 47 mm outside diameter, 30 mm bore and 17 mm width, envelope 30×47×17 mm. Mass is 101 g." }, { "q": "What does the NA4906-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4906-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×47×17 mm and the catalogue ratings are C 28.5 kN, C0 35.5 kN, Cur 6.6 kN." }, { "q": "What is the load capacity of the NA4906-XL?", "a": "The basic dynamic load rating C is 28.5 kN and the basic static load rating C0 is 35.5 kN; the fatigue load limit Cur is 6.6 kN." }, { "q": "What is the maximum speed of the NA4906-XL?", "a": "The limiting speed is 12,600 r/min and the thermal reference speed is 6,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4906-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4906", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×17 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4906-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4906-XL", "NA4906-XL" ], "locale_variants": {} }, { "sku": "NA6906-XL", "brand": "FAG", "manufacturer_designation": "NA6906-XL", "series": "na69-series", "type": "needle", "d_mm": 30, "D_mm": 47, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 49, "static_load_kN": 71, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 12600, "max_rpm": 12600, "reference_speed_rpm": 6300, "weight_g": 192, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×47×30 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 49 kN and C0 71 kN at the 30 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 13.1 kN, the limiting speed 12,600 r/min and the thermal reference speed 6,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.63 kN/mm and per millimetre of width 1.63 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 192 g, just 0.14 g per mm² of projected 47×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The 8.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 71 kN C0 rating still assumes full rigid support under both rings The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 12,600 r/min limit. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 47 mm outside diameter and 49 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 30 mm seat, and in agricultural machine pivots and linkages the 192 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 71 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA6906-XL?", "a": "The NA6906-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 47 mm outside diameter, 30 mm bore and 30 mm width, envelope 30×47×30 mm. Mass is 192 g." }, { "q": "What does the NA6906-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6906-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×47×30 mm and the catalogue ratings are C 49 kN, C0 71 kN, Cur 13.1 kN." }, { "q": "What is the load capacity of the NA6906-XL?", "a": "The basic dynamic load rating C is 49 kN and the basic static load rating C0 is 71 kN; the fatigue load limit Cur is 13.1 kN." }, { "q": "What is the maximum speed of the NA6906-XL?", "a": "The limiting speed is 12,600 r/min and the thermal reference speed is 6,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6906-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6906", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×47×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6906-XL", "NA6906-XL" ], "locale_variants": {} }, { "sku": "NKIS30-XL", "brand": "FAG", "manufacturer_designation": "NKIS30-XL", "series": "nkis-series", "type": "needle", "d_mm": 30, "D_mm": 52, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 41.5, "static_load_kN": 50, "fatigue_load_limit_kN": 8.8, "limiting_speed_rpm": 11700, "max_rpm": 11700, "reference_speed_rpm": 6400, "weight_g": 184, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×52×22 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 41.5 kN and C0 50 kN at the 30 mm seat; the C/C0 ratio of 0.83 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 8.8 kN, the limiting speed 11,700 r/min and the thermal reference speed 6,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.38 kN/mm and per millimetre of width 1.89 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 184 g, just 0.16 g per mm² of projected 52×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty NKIS30-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NKIS prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 41.5 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 11,700 r/min limit. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 52 mm outside diameter and 41.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 30 mm seat, and in motorcycle and light-vehicle transmissions the 184 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 22 mm width and the published 50 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKIS30-XL?", "a": "The NKIS30-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 52 mm outside diameter, 30 mm bore and 22 mm width, envelope 30×52×22 mm. Mass is 184 g." }, { "q": "What does the NKIS30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS30-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×52×22 mm and the catalogue ratings are C 41.5 kN, C0 50 kN, Cur 8.8 kN." }, { "q": "What is the load capacity of the NKIS30-XL?", "a": "The basic dynamic load rating C is 41.5 kN and the basic static load rating C0 is 50 kN; the fatigue load limit Cur is 8.8 kN." }, { "q": "What is the maximum speed of the NKIS30-XL?", "a": "The limiting speed is 11,700 r/min and the thermal reference speed is 6,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS30", "equiv_brand": "SKF", "level": "partial", "note": "Same 30×52×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS30-XL", "NKIS30-XL" ], "locale_variants": {} }, { "sku": "NKI32-20-XL", "brand": "FAG", "manufacturer_designation": "NKI32/20-XL", "series": "nki-series", "type": "needle", "d_mm": 32, "D_mm": 47, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28, "static_load_kN": 43.5, "fatigue_load_limit_kN": 7.8, "limiting_speed_rpm": 12300, "max_rpm": 12300, "reference_speed_rpm": 6900, "weight_g": 118, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×47×20 mm: 32 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 28 kN and C0 43.5 kN at the 32 mm seat; the C/C0 ratio of 0.64 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 7.8 kN, the limiting speed 12,300 r/min and the thermal reference speed 6,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 1.40 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 118 g, just 0.13 g per mm² of projected 47×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 32 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space NKI32/20-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The 7.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 32×47×20 mm envelope. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 47 mm outside diameter and 28 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 32 mm seat, and in motorcycle and light-vehicle transmissions the 118 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 20 mm width and the published 43.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI32/20-XL?", "a": "The NKI32/20-XL is a NKI machined-ring needle roller bearing with inner ring with 47 mm outside diameter, 32 mm bore and 20 mm width, envelope 32×47×20 mm. Mass is 118 g." }, { "q": "What does the NKI32/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI32/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×47×20 mm and the catalogue ratings are C 28 kN, C0 43.5 kN, Cur 7.8 kN." }, { "q": "What is the load capacity of the NKI32/20-XL?", "a": "The basic dynamic load rating C is 28 kN and the basic static load rating C0 is 43.5 kN; the fatigue load limit Cur is 7.8 kN." }, { "q": "What is the maximum speed of the NKI32/20-XL?", "a": "The limiting speed is 12,300 r/min and the thermal reference speed is 6,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI32/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 32 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI32-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×47×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI32-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI32-20-XL", "NKI32/20-XL" ], "locale_variants": {} }, { "sku": "NKI32-30-XL", "brand": "FAG", "manufacturer_designation": "NKI32/30-XL", "series": "nki-series", "type": "needle", "d_mm": 32, "D_mm": 47, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 42, "static_load_kN": 73, "fatigue_load_limit_kN": 13.7, "limiting_speed_rpm": 12300, "max_rpm": 12300, "reference_speed_rpm": 6600, "weight_g": 180, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×47×30 mm: 32 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 42 kN and C0 73 kN at the 32 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 13.7 kN, the limiting speed 12,300 r/min and the thermal reference speed 6,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.31 kN/mm and per millimetre of width 1.40 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 180 g, just 0.13 g per mm² of projected 47×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 32 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 30 mm width as a standard mounting space Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 42 kN C NKI32/30-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 12,300 r/min limit. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 47 mm outside diameter and 42 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 32 mm seat, and in gearbox selector and change linkages the 180 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 73 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI32/30-XL?", "a": "The NKI32/30-XL is a NKI machined-ring needle roller bearing with inner ring with 47 mm outside diameter, 32 mm bore and 30 mm width, envelope 32×47×30 mm. Mass is 180 g." }, { "q": "What does the NKI32/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI32/30-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×47×30 mm and the catalogue ratings are C 42 kN, C0 73 kN, Cur 13.7 kN." }, { "q": "What is the load capacity of the NKI32/30-XL?", "a": "The basic dynamic load rating C is 42 kN and the basic static load rating C0 is 73 kN; the fatigue load limit Cur is 13.7 kN." }, { "q": "What is the maximum speed of the NKI32/30-XL?", "a": "The limiting speed is 12,300 r/min and the thermal reference speed is 6,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI32/30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 32 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI32-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI32-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×47×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI32-30-XL", "NKI32/30-XL" ], "locale_variants": {} }, { "sku": "NA49-32-XL", "brand": "FAG", "manufacturer_designation": "NA49/32-XL", "series": "na49-series", "type": "needle", "d_mm": 32, "D_mm": 52, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 34.5, "static_load_kN": 47.5, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 11100, "max_rpm": 11100, "reference_speed_rpm": 6000, "weight_g": 158, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×52×20 mm: 32 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 34.5 kN and C0 47.5 kN at the 32 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 11,100 r/min and the thermal reference speed 6,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.08 kN/mm and per millimetre of width 1.73 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 158 g, just 0.15 g per mm² of projected 52×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 32 mm bore marks the medium range: mounting forces and fits become critical, and the 158 g mass calls for proper induction or press tooling rather than hand fitting The 10.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 34.5 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 11,100 r/min limit. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 52 mm outside diameter and 34.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 32 mm seat, and in connecting-rod small ends the 158 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 20 mm width and the published 47.5 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA49/32-XL?", "a": "The NA49/32-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 52 mm outside diameter, 32 mm bore and 20 mm width, envelope 32×52×20 mm. Mass is 158 g." }, { "q": "What does the NA49/32-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA49/32-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×52×20 mm and the catalogue ratings are C 34.5 kN, C0 47.5 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the NA49/32-XL?", "a": "The basic dynamic load rating C is 34.5 kN and the basic static load rating C0 is 47.5 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the NA49/32-XL?", "a": "The limiting speed is 11,100 r/min and the thermal reference speed is 6,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA49/32-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 32 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA49-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA49-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA49-32", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×52×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA49-32-XL", "NA49/32-XL" ], "locale_variants": {} }, { "sku": "NA69-32-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA69/32-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 32, "D_mm": 52, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 82, "fatigue_load_limit_kN": 15.4, "limiting_speed_rpm": 11100, "max_rpm": 11100, "reference_speed_rpm": 6100, "weight_g": 288, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 32×52×36 mm: 32 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 53 kN and C0 82 kN at the 32 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 52 mm outside diameter the fatigue load limit Cur is 15.4 kN, the limiting speed 11,100 r/min and the thermal reference speed 6,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.66 kN/mm and per millimetre of width 1.47 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 288 g, just 0.15 g per mm² of projected 52×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 32 mm bore marks the medium range: mounting forces and fits become critical, and the 288 g mass calls for proper induction or press tooling rather than hand fitting The 10.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel Cur 15.4 kN, limiting speed 11,100 r/min, reference speed 6,100 r/min — the inner ring adds a few grams (total 288 g) but removes the hardening requirement X-life status (-XL) indicates the current Schaeffler premium execution at 32 mm bore; the 82 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 36 mm-wide envelope for higher capacity at the same bore. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 52 mm outside diameter and 53 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 32 mm seat, and in motorcycle and light-vehicle transmissions the 288 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 36 mm width and the published 82 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA69/32-ZW-XL?", "a": "The NA69/32-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 52 mm outside diameter, 32 mm bore and 36 mm width, envelope 32×52×36 mm. Mass is 288 g." }, { "q": "What does the NA69/32-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA69/32-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 32×52×36 mm and the catalogue ratings are C 53 kN, C0 82 kN, Cur 15.4 kN." }, { "q": "What is the load capacity of the NA69/32-ZW-XL?", "a": "The basic dynamic load rating C is 53 kN and the basic static load rating C0 is 82 kN; the fatigue load limit Cur is 15.4 kN." }, { "q": "What is the maximum speed of the NA69/32-ZW-XL?", "a": "The limiting speed is 11,100 r/min and the thermal reference speed is 6,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA69/32-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 32 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA69-22", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA69-28", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NA69-32", "equiv_brand": "SKF", "level": "partial", "note": "Same 32×52×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA69-32-ZW-XL", "NA69/32-ZW-XL" ], "locale_variants": {} }, { "sku": "NKI35-20-TW-XL", "brand": "FAG", "manufacturer_designation": "NKI35/20-TW-XL", "series": "nki-series", "type": "needle", "d_mm": 35, "D_mm": 50, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32.5, "static_load_kN": 48.5, "fatigue_load_limit_kN": 10.1, "limiting_speed_rpm": 11400, "max_rpm": 11400, "reference_speed_rpm": 6900, "weight_g": 122, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×50×20 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 32.5 kN and C0 48.5 kN at the 35 mm seat; the C/C0 ratio of 0.67 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 10.1 kN, the limiting speed 11,400 r/min and the thermal reference speed 6,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 1.63 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 122 g, just 0.12 g per mm² of projected 50×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space NKI35/20-TW-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The 7.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 32.5 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 50 mm outside diameter and 32.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 35 mm seat, and in hydraulic and pneumatic pump eccentrics the 122 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 48.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI35/20-TW-XL?", "a": "The NKI35/20-TW-XL is a NKI machined-ring needle roller bearing with inner ring with 50 mm outside diameter, 35 mm bore and 20 mm width, envelope 35×50×20 mm. Mass is 122 g." }, { "q": "What does the NKI35/20-TW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI35/20-TW-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×50×20 mm and the catalogue ratings are C 32.5 kN, C0 48.5 kN, Cur 10.1 kN." }, { "q": "What is the load capacity of the NKI35/20-TW-XL?", "a": "The basic dynamic load rating C is 32.5 kN and the basic static load rating C0 is 48.5 kN; the fatigue load limit Cur is 10.1 kN." }, { "q": "What is the maximum speed of the NKI35/20-TW-XL?", "a": "The limiting speed is 11,400 r/min and the thermal reference speed is 6,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI35/20-TW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI35-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×50×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI35-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI35-20-TW-XL", "NKI35/20-TW-XL" ], "locale_variants": {} }, { "sku": "NKI35-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI35/20-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 35, "D_mm": 50, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 33.5, "static_load_kN": 56, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 11400, "max_rpm": 11400, "reference_speed_rpm": 6100, "weight_g": 122, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×50×20 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 33.5 kN and C0 56 kN at the 35 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 10 kN, the limiting speed 11,400 r/min and the thermal reference speed 6,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 1.68 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 122 g, just 0.12 g per mm² of projected 50×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space The integral inner ring brings the bore to 35 mm inside the 50×20 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The 7.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 10 kN Cur value. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 11,400 r/min. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 50 mm outside diameter and 33.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 35 mm seat, and in motorcycle and light-vehicle transmissions the 122 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 20 mm width and the published 56 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI35/20-TV-XL?", "a": "The NKI35/20-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 50 mm outside diameter, 35 mm bore and 20 mm width, envelope 35×50×20 mm. Mass is 122 g." }, { "q": "What does the NKI35/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI35/20-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×50×20 mm and the catalogue ratings are C 33.5 kN, C0 56 kN, Cur 10 kN." }, { "q": "What is the load capacity of the NKI35/20-TV-XL?", "a": "The basic dynamic load rating C is 33.5 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 10 kN." }, { "q": "What is the maximum speed of the NKI35/20-TV-XL?", "a": "The limiting speed is 11,400 r/min and the thermal reference speed is 6,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI35/20-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI35-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×50×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI35-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI35-20-TV-XL", "NKI35/20-TV-XL" ], "locale_variants": {} }, { "sku": "NKI35-30-XL", "brand": "FAG", "manufacturer_designation": "NKI35/30-XL", "series": "nki-series", "type": "needle", "d_mm": 35, "D_mm": 50, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44, "static_load_kN": 79, "fatigue_load_limit_kN": 14.9, "limiting_speed_rpm": 11400, "max_rpm": 11400, "reference_speed_rpm": 6200, "weight_g": 193, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×50×30 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 44 kN and C0 79 kN at the 35 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 14.9 kN, the limiting speed 11,400 r/min and the thermal reference speed 6,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.26 kN/mm and per millimetre of width 1.47 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 193 g, just 0.13 g per mm² of projected 50×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 50 mm envelope already carries ratings in the tens of kilonewtons Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 44 kN C The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 79 kN C0 rating still assumes full rigid support under both rings The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 35×50×30 mm envelope. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 50 mm outside diameter and 44 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 35 mm seat, and in agricultural machine pivots and linkages the 193 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 79 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI35/30-XL?", "a": "The NKI35/30-XL is a NKI machined-ring needle roller bearing with inner ring with 50 mm outside diameter, 35 mm bore and 30 mm width, envelope 35×50×30 mm. Mass is 193 g." }, { "q": "What does the NKI35/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI35/30-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×50×30 mm and the catalogue ratings are C 44 kN, C0 79 kN, Cur 14.9 kN." }, { "q": "What is the load capacity of the NKI35/30-XL?", "a": "The basic dynamic load rating C is 44 kN and the basic static load rating C0 is 79 kN; the fatigue load limit Cur is 14.9 kN." }, { "q": "What is the maximum speed of the NKI35/30-XL?", "a": "The limiting speed is 11,400 r/min and the thermal reference speed is 6,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI35/30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI35-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI35-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×50×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI35-30-XL", "NKI35/30-XL" ], "locale_variants": {} }, { "sku": "NA4907-XL", "brand": "FAG", "manufacturer_designation": "NA4907-XL", "series": "na49-series", "type": "needle", "d_mm": 35, "D_mm": 55, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 35.5, "static_load_kN": 50, "fatigue_load_limit_kN": 9.6, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 5800, "weight_g": 170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×55×20 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 35.5 kN and C0 50 kN at the 35 mm seat; the C/C0 ratio of 0.71 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 9.6 kN, the limiting speed 10,700 r/min and the thermal reference speed 5,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 1.77 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 170 g, just 0.15 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space This is the choice for OEM production on soft shafts: machine the 35 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway Cur 9.6 kN, limiting speed 10,700 r/min, reference speed 5,800 r/min — the inner ring adds a few grams (total 170 g) but removes the hardening requirement X-life status (-XL) indicates the current Schaeffler premium execution at 35 mm bore; the 50 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 55 mm outside diameter and 35.5 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 35 mm seat, and in hydraulic and pneumatic pump eccentrics the 170 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 50 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4907-XL?", "a": "The NA4907-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 55 mm outside diameter, 35 mm bore and 20 mm width, envelope 35×55×20 mm. Mass is 170 g." }, { "q": "What does the NA4907-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4907-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×55×20 mm and the catalogue ratings are C 35.5 kN, C0 50 kN, Cur 9.6 kN." }, { "q": "What is the load capacity of the NA4907-XL?", "a": "The basic dynamic load rating C is 35.5 kN and the basic static load rating C0 is 50 kN; the fatigue load limit Cur is 9.6 kN." }, { "q": "What is the maximum speed of the NA4907-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 5,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4907-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4907", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4907-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4907-XL", "NA4907-XL" ], "locale_variants": {} }, { "sku": "NA6907-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6907-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 35, "D_mm": 55, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 54, "static_load_kN": 86, "fatigue_load_limit_kN": 16.2, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 5900, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×55×36 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 54 kN and C0 86 kN at the 35 mm seat; the C/C0 ratio of 0.63 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 16.2 kN, the limiting speed 10,700 r/min and the thermal reference speed 5,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.54 kN/mm and per millimetre of width 1.50 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 310 g, just 0.16 g per mm² of projected 55×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 36 mm width as a standard mounting space The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 86 kN C0 rating still assumes full rigid support under both rings Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 54 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 35 mm bore; the 86 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 36 mm-wide envelope for higher capacity at the same bore. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 55 mm outside diameter and 54 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 35 mm seat, and in small electric motor accessory drives the 310 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 36 mm width and the published 86 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA6907-ZW-XL?", "a": "The NA6907-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 55 mm outside diameter, 35 mm bore and 36 mm width, envelope 35×55×36 mm. Mass is 310 g." }, { "q": "What does the NA6907-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6907-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×55×36 mm and the catalogue ratings are C 54 kN, C0 86 kN, Cur 16.2 kN." }, { "q": "What is the load capacity of the NA6907-ZW-XL?", "a": "The basic dynamic load rating C is 54 kN and the basic static load rating C0 is 86 kN; the fatigue load limit Cur is 16.2 kN." }, { "q": "What is the maximum speed of the NA6907-ZW-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 5,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6907-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6907", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×55×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6907-ZW-XL", "NA6907-ZW-XL" ], "locale_variants": {} }, { "sku": "NKIS35-XL", "brand": "FAG", "manufacturer_designation": "NKIS35-XL", "series": "nkis-series", "type": "needle", "d_mm": 35, "D_mm": 58, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 44, "static_load_kN": 57, "fatigue_load_limit_kN": 10, "limiting_speed_rpm": 10200, "max_rpm": 10200, "reference_speed_rpm": 5600, "weight_g": 220, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×58×22 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.5 mm radial section packed with small-diameter needle rollers C is 44 kN and C0 57 kN at the 35 mm seat; the C/C0 ratio of 0.77 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 58 mm outside diameter the fatigue load limit Cur is 10 kN, the limiting speed 10,200 r/min and the thermal reference speed 5,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.26 kN/mm and per millimetre of width 2.00 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 220 g, just 0.17 g per mm² of projected 58×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 35 mm bore marks the medium range: mounting forces and fits become critical, and the 220 g mass calls for proper induction or press tooling rather than hand fitting The 11.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 57 kN C0 rating still assumes full rigid support under both rings X-life status (-XL) indicates the current Schaeffler premium execution at 35 mm bore; the 57 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 58 mm outside diameter and 44 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 35 mm seat, and in hydraulic and pneumatic pump eccentrics the 220 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 22 mm width and the published 57 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKIS35-XL?", "a": "The NKIS35-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 58 mm outside diameter, 35 mm bore and 22 mm width, envelope 35×58×22 mm. Mass is 220 g." }, { "q": "What does the NKIS35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS35-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×58×22 mm and the catalogue ratings are C 44 kN, C0 57 kN, Cur 10 kN." }, { "q": "What is the load capacity of the NKIS35-XL?", "a": "The basic dynamic load rating C is 44 kN and the basic static load rating C0 is 57 kN; the fatigue load limit Cur is 10 kN." }, { "q": "What is the maximum speed of the NKIS35-XL?", "a": "The limiting speed is 10,200 r/min and the thermal reference speed is 5,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS35", "equiv_brand": "SKF", "level": "partial", "note": "Same 35×58×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=960", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS35-XL", "NKIS35-XL" ], "locale_variants": {} }, { "sku": "NKI38-20-XL", "brand": "FAG", "manufacturer_designation": "NKI38/20-XL", "series": "nki-series", "type": "needle", "d_mm": 38, "D_mm": 53, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30.5, "static_load_kN": 51, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 6000, "weight_g": 136, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 38×53×20 mm: 38 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 30.5 kN and C0 51 kN at the 38 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 53 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 10,700 r/min and the thermal reference speed 6,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.80 kN/mm and per millimetre of width 1.52 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 136 g, just 0.13 g per mm² of projected 53×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 38 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 30.5 kN C NKI38/20-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 9.1 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 53 mm outside diameter and 30.5 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 38 mm seat, and in gearbox selector and change linkages the 136 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 20 mm width and the published 51 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI38/20-XL?", "a": "The NKI38/20-XL is a NKI machined-ring needle roller bearing with inner ring with 53 mm outside diameter, 38 mm bore and 20 mm width, envelope 38×53×20 mm. Mass is 136 g." }, { "q": "What does the NKI38/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI38/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 38×53×20 mm and the catalogue ratings are C 30.5 kN, C0 51 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the NKI38/20-XL?", "a": "The basic dynamic load rating C is 30.5 kN and the basic static load rating C0 is 51 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the NKI38/20-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 6,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI38/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 38 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI38-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 38×53×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI38-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI38-20-XL", "NKI38/20-XL" ], "locale_variants": {} }, { "sku": "NKI38-30-XL", "brand": "FAG", "manufacturer_designation": "NKI38/30-XL", "series": "nki-series", "type": "needle", "d_mm": 38, "D_mm": 53, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 85, "fatigue_load_limit_kN": 16.1, "limiting_speed_rpm": 10700, "max_rpm": 10700, "reference_speed_rpm": 5900, "weight_g": 207, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 38×53×30 mm: 38 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 45.5 kN and C0 85 kN at the 38 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 53 mm outside diameter the fatigue load limit Cur is 16.1 kN, the limiting speed 10,700 r/min and the thermal reference speed 5,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.20 kN/mm and per millimetre of width 1.52 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 207 g, just 0.13 g per mm² of projected 53×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 38 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 30 mm width as a standard mounting space This is the choice for OEM production on soft shafts: machine the 38 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 45.5 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 45.5 kN C rating and longer nominal life come without an envelope change. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 53 mm outside diameter and 45.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 38 mm seat, and in connecting-rod small ends the 207 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 85 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI38/30-XL?", "a": "The NKI38/30-XL is a NKI machined-ring needle roller bearing with inner ring with 53 mm outside diameter, 38 mm bore and 30 mm width, envelope 38×53×30 mm. Mass is 207 g." }, { "q": "What does the NKI38/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI38/30-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 38×53×30 mm and the catalogue ratings are C 45.5 kN, C0 85 kN, Cur 16.1 kN." }, { "q": "What is the load capacity of the NKI38/30-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 85 kN; the fatigue load limit Cur is 16.1 kN." }, { "q": "What is the maximum speed of the NKI38/30-XL?", "a": "The limiting speed is 10,700 r/min and the thermal reference speed is 5,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI38/30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 38 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI38-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI38-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 38×53×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI38-30-XL", "NKI38/30-XL" ], "locale_variants": {} }, { "sku": "NKI40-20-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI40/20-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 40, "D_mm": 55, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 35, "static_load_kN": 62, "fatigue_load_limit_kN": 11, "limiting_speed_rpm": 10200, "max_rpm": 10200, "reference_speed_rpm": 5600, "weight_g": 136, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×55×20 mm: 40 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 35 kN and C0 62 kN at the 40 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 11 kN, the limiting speed 10,200 r/min and the thermal reference speed 5,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 1.75 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 136 g, just 0.12 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 40 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space Cur 11 kN, limiting speed 10,200 r/min, reference speed 5,600 r/min — the inner ring adds a few grams (total 136 g) but removes the hardening requirement Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 35 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 10,200 r/min limit. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 55 mm outside diameter and 35 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 40 mm seat, and in hydraulic and pneumatic pump eccentrics the 136 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 20 mm width and the published 62 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI40/20-TV-XL?", "a": "The NKI40/20-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 55 mm outside diameter, 40 mm bore and 20 mm width, envelope 40×55×20 mm. Mass is 136 g." }, { "q": "What does the NKI40/20-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI40/20-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×55×20 mm and the catalogue ratings are C 35 kN, C0 62 kN, Cur 11 kN." }, { "q": "What is the load capacity of the NKI40/20-TV-XL?", "a": "The basic dynamic load rating C is 35 kN and the basic static load rating C0 is 62 kN; the fatigue load limit Cur is 11 kN." }, { "q": "What is the maximum speed of the NKI40/20-TV-XL?", "a": "The limiting speed is 10,200 r/min and the thermal reference speed is 5,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI40/20-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 40 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI40-20-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×55×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI40-30-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI40-20-TV-XL", "NKI40/20-TV-XL" ], "locale_variants": {} }, { "sku": "NKI40-30-TW-XL", "brand": "FAG", "manufacturer_designation": "NKI40/30-TW-XL", "series": "nki-series", "type": "needle", "d_mm": 40, "D_mm": 55, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 54, "static_load_kN": 97, "fatigue_load_limit_kN": 18.6, "limiting_speed_rpm": 10200, "max_rpm": 10200, "reference_speed_rpm": 5900, "weight_g": 216, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×55×30 mm: 40 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 54 kN and C0 97 kN at the 40 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 18.6 kN, the limiting speed 10,200 r/min and the thermal reference speed 5,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.35 kN/mm and per millimetre of width 1.80 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 216 g, just 0.13 g per mm² of projected 55×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 55 mm envelope already carries ratings in the tens of kilonewtons NKI40/30-TW-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 54 kN C As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 18.6 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 55 mm outside diameter and 54 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 40 mm seat, and in gearbox selector and change linkages the 216 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 97 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI40/30-TW-XL?", "a": "The NKI40/30-TW-XL is a NKI machined-ring needle roller bearing with inner ring with 55 mm outside diameter, 40 mm bore and 30 mm width, envelope 40×55×30 mm. Mass is 216 g." }, { "q": "What does the NKI40/30-TW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI40/30-TW-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×55×30 mm and the catalogue ratings are C 54 kN, C0 97 kN, Cur 18.6 kN." }, { "q": "What is the load capacity of the NKI40/30-TW-XL?", "a": "The basic dynamic load rating C is 54 kN and the basic static load rating C0 is 97 kN; the fatigue load limit Cur is 18.6 kN." }, { "q": "What is the maximum speed of the NKI40/30-TW-XL?", "a": "The limiting speed is 10,200 r/min and the thermal reference speed is 5,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI40/30-TW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 40 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI40-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI40-30-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×55×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI40-30-TW-XL", "NKI40/30-TW-XL" ], "locale_variants": {} }, { "sku": "NKI40-30-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI40/30-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 40, "D_mm": 55, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 52, "static_load_kN": 103, "fatigue_load_limit_kN": 19.5, "limiting_speed_rpm": 10200, "max_rpm": 10200, "reference_speed_rpm": 5400, "weight_g": 216, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×55×30 mm: 40 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 52 kN and C0 103 kN at the 40 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 19.5 kN, the limiting speed 10,200 r/min and the thermal reference speed 5,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.30 kN/mm and per millimetre of width 1.73 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 216 g, just 0.13 g per mm² of projected 55×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 55 mm envelope already carries ratings in the tens of kilonewtons Cur 19.5 kN, limiting speed 10,200 r/min, reference speed 5,400 r/min — the inner ring adds a few grams (total 216 g) but removes the hardening requirement This is the choice for OEM production on soft shafts: machine the 40 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway X-life status (-XL) indicates the current Schaeffler premium execution at 40 mm bore; the 103 kN C0 rating reflects the improved rolling-contact geometry. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 55 mm outside diameter and 52 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 40 mm seat, and in textile machine heald and cam shafts the 216 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 103 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NKI40/30-TV-XL?", "a": "The NKI40/30-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 55 mm outside diameter, 40 mm bore and 30 mm width, envelope 40×55×30 mm. Mass is 216 g." }, { "q": "What does the NKI40/30-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI40/30-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×55×30 mm and the catalogue ratings are C 52 kN, C0 103 kN, Cur 19.5 kN." }, { "q": "What is the load capacity of the NKI40/30-TV-XL?", "a": "The basic dynamic load rating C is 52 kN and the basic static load rating C0 is 103 kN; the fatigue load limit Cur is 19.5 kN." }, { "q": "What is the maximum speed of the NKI40/30-TV-XL?", "a": "The limiting speed is 10,200 r/min and the thermal reference speed is 5,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI40/30-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 40 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI40-20-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI40-30-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×55×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI40-30-TV-XL", "NKI40/30-TV-XL" ], "locale_variants": {} }, { "sku": "NA4908-XL", "brand": "FAG", "manufacturer_designation": "NA4908-XL", "series": "na49-series", "type": "needle", "d_mm": 40, "D_mm": 62, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 67, "fatigue_load_limit_kN": 11.7, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 5000, "weight_g": 230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×62×22 mm: 40 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 48.5 kN and C0 67 kN at the 40 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 11.7 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.21 kN/mm and per millimetre of width 2.20 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 230 g, just 0.17 g per mm² of projected 62×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 40 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 67 kN C0 rating still assumes full rigid support under both rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11.7 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 62 mm outside diameter and 48.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 40 mm seat, and in small electric motor accessory drives the 230 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 22 mm width and the published 67 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA4908-XL?", "a": "The NA4908-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 62 mm outside diameter, 40 mm bore and 22 mm width, envelope 40×62×22 mm. Mass is 230 g." }, { "q": "What does the NA4908-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4908-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×62×22 mm and the catalogue ratings are C 48.5 kN, C0 67 kN, Cur 11.7 kN." }, { "q": "What is the load capacity of the NA4908-XL?", "a": "The basic dynamic load rating C is 48.5 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 11.7 kN." }, { "q": "What is the maximum speed of the NA4908-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 5,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4908-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 40 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4908", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4908-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4908-XL", "NA4908-XL" ], "locale_variants": {} }, { "sku": "NA6908-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6908-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 40, "D_mm": 62, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 74, "static_load_kN": 116, "fatigue_load_limit_kN": 19.8, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 5100, "weight_g": 430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×62×40 mm: 40 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 74 kN and C0 116 kN at the 40 mm seat; the C/C0 ratio of 0.64 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 19.8 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.85 kN/mm and per millimetre of width 1.85 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 430 g, just 0.17 g per mm² of projected 62×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons Cur 19.8 kN, limiting speed 9,200 r/min, reference speed 5,100 r/min — the inner ring adds a few grams (total 430 g) but removes the hardening requirement The 11.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel X-life status (-XL) indicates the current Schaeffler premium execution at 40 mm bore; the 116 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 40 mm-wide envelope for higher capacity at the same bore. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 62 mm outside diameter and 74 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 40 mm seat, and in two-stroke and compressor piston pins the 430 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 40 mm width and the published 116 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA6908-ZW-XL?", "a": "The NA6908-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 62 mm outside diameter, 40 mm bore and 40 mm width, envelope 40×62×40 mm. Mass is 430 g." }, { "q": "What does the NA6908-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6908-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×62×40 mm and the catalogue ratings are C 74 kN, C0 116 kN, Cur 19.8 kN." }, { "q": "What is the load capacity of the NA6908-ZW-XL?", "a": "The basic dynamic load rating C is 74 kN and the basic static load rating C0 is 116 kN; the fatigue load limit Cur is 19.8 kN." }, { "q": "What is the maximum speed of the NA6908-ZW-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 5,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6908-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 40 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6908", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×62×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6908-ZW-XL", "NA6908-ZW-XL" ], "locale_variants": {} }, { "sku": "NKIS40-XL", "brand": "FAG", "manufacturer_designation": "NKIS40-XL", "series": "nkis-series", "type": "needle", "d_mm": 40, "D_mm": 65, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48, "static_load_kN": 67, "fatigue_load_limit_kN": 11.8, "limiting_speed_rpm": 8900, "max_rpm": 8900, "reference_speed_rpm": 4850, "weight_g": 281, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×65×22 mm: 40 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 48 kN and C0 67 kN at the 40 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 65 mm outside diameter the fatigue load limit Cur is 11.8 kN, the limiting speed 8,900 r/min and the thermal reference speed 4,850 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.20 kN/mm and per millimetre of width 2.18 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 281 g, just 0.20 g per mm² of projected 65×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 65 mm envelope already carries ratings in the tens of kilonewtons Reading the NKIS prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 48 kN C Cur 11.8 kN, limiting speed 8,900 r/min, reference speed 4,850 r/min — the inner ring adds a few grams (total 281 g) but removes the hardening requirement The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 8,900 r/min limit. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 65 mm outside diameter and 48 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 40 mm seat, and in two-stroke and compressor piston pins the 281 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 22 mm width and the published 67 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKIS40-XL?", "a": "The NKIS40-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 65 mm outside diameter, 40 mm bore and 22 mm width, envelope 40×65×22 mm. Mass is 281 g." }, { "q": "What does the NKIS40-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS40-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×65×22 mm and the catalogue ratings are C 48 kN, C0 67 kN, Cur 11.8 kN." }, { "q": "What is the load capacity of the NKIS40-XL?", "a": "The basic dynamic load rating C is 48 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 11.8 kN." }, { "q": "What is the maximum speed of the NKIS40-XL?", "a": "The limiting speed is 8,900 r/min and the thermal reference speed is 4,850 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS40-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 40 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS40", "equiv_brand": "SKF", "level": "partial", "note": "Same 40×65×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS40-XL", "NKIS40-XL" ], "locale_variants": {} }, { "sku": "NKI42-20-XL", "brand": "FAG", "manufacturer_designation": "NKI42/20-XL", "series": "nki-series", "type": "needle", "d_mm": 42, "D_mm": 57, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32.5, "static_load_kN": 56, "fatigue_load_limit_kN": 10.1, "limiting_speed_rpm": 9800, "max_rpm": 9800, "reference_speed_rpm": 5600, "weight_g": 148, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×57×20 mm: 42 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 32.5 kN and C0 56 kN at the 42 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 57 mm outside diameter the fatigue load limit Cur is 10.1 kN, the limiting speed 9,800 r/min and the thermal reference speed 5,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.77 kN/mm and per millimetre of width 1.63 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 148 g, just 0.13 g per mm² of projected 57×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 42 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 20 mm width as a standard mounting space This is the choice for OEM production on soft shafts: machine the 42 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway NKI42/20-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 9,800 r/min limit. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 57 mm outside diameter and 32.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 42 mm seat, and in small electric motor accessory drives the 148 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 20 mm width and the published 56 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI42/20-XL?", "a": "The NKI42/20-XL is a NKI machined-ring needle roller bearing with inner ring with 57 mm outside diameter, 42 mm bore and 20 mm width, envelope 42×57×20 mm. Mass is 148 g." }, { "q": "What does the NKI42/20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI42/20-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 42×57×20 mm and the catalogue ratings are C 32.5 kN, C0 56 kN, Cur 10.1 kN." }, { "q": "What is the load capacity of the NKI42/20-XL?", "a": "The basic dynamic load rating C is 32.5 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 10.1 kN." }, { "q": "What is the maximum speed of the NKI42/20-XL?", "a": "The limiting speed is 9,800 r/min and the thermal reference speed is 5,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI42/20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 42 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI42-20", "equiv_brand": "SKF", "level": "partial", "note": "Same 42×57×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI42-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI42-20-XL", "NKI42/20-XL" ], "locale_variants": {} }, { "sku": "NKI42-30-XL", "brand": "FAG", "manufacturer_designation": "NKI42/30-XL", "series": "nki-series", "type": "needle", "d_mm": 42, "D_mm": 57, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 48.5, "static_load_kN": 94, "fatigue_load_limit_kN": 17.8, "limiting_speed_rpm": 9800, "max_rpm": 9800, "reference_speed_rpm": 5400, "weight_g": 222, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×57×30 mm: 42 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 48.5 kN and C0 94 kN at the 42 mm seat; the C/C0 ratio of 0.52 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 57 mm outside diameter the fatigue load limit Cur is 17.8 kN, the limiting speed 9,800 r/min and the thermal reference speed 5,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.15 kN/mm and per millimetre of width 1.62 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 222 g, just 0.13 g per mm² of projected 57×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 42 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 30 mm width as a standard mounting space This is the choice for OEM production on soft shafts: machine the 42 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The 7.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel X-life status (-XL) indicates the current Schaeffler premium execution at 42 mm bore; the 94 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 57 mm outside diameter and 48.5 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 42 mm seat, and in agricultural machine pivots and linkages the 222 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 94 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI42/30-XL?", "a": "The NKI42/30-XL is a NKI machined-ring needle roller bearing with inner ring with 57 mm outside diameter, 42 mm bore and 30 mm width, envelope 42×57×30 mm. Mass is 222 g." }, { "q": "What does the NKI42/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI42/30-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 42×57×30 mm and the catalogue ratings are C 48.5 kN, C0 94 kN, Cur 17.8 kN." }, { "q": "What is the load capacity of the NKI42/30-XL?", "a": "The basic dynamic load rating C is 48.5 kN and the basic static load rating C0 is 94 kN; the fatigue load limit Cur is 17.8 kN." }, { "q": "What is the maximum speed of the NKI42/30-XL?", "a": "The limiting speed is 9,800 r/min and the thermal reference speed is 5,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI42/30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 42 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI42-20", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI42-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 42×57×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI42-30-XL", "NKI42/30-XL" ], "locale_variants": {} }, { "sku": "NKI45-25-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI45/25-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 45, "D_mm": 62, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 48.5, "static_load_kN": 87, "fatigue_load_limit_kN": 15, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 5100, "weight_g": 217, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×62×25 mm: 45 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 48.5 kN and C0 87 kN at the 45 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 15 kN, the limiting speed 9,200 r/min and the thermal reference speed 5,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.08 kN/mm and per millimetre of width 1.94 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 217 g, just 0.14 g per mm² of projected 62×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 45 mm bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons The integral inner ring brings the bore to 45 mm inside the 62×25 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The 8.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel X-life status (-XL) indicates the current Schaeffler premium execution at 45 mm bore; the 87 kN C0 rating reflects the improved rolling-contact geometry. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 9,200 r/min limiting speed without roller-to-roller sliding. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 62 mm outside diameter and 48.5 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 45 mm seat, and in gearbox selector and change linkages the 217 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 25 mm width and the published 87 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI45/25-TV-XL?", "a": "The NKI45/25-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 62 mm outside diameter, 45 mm bore and 25 mm width, envelope 45×62×25 mm. Mass is 217 g." }, { "q": "What does the NKI45/25-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI45/25-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×62×25 mm and the catalogue ratings are C 48.5 kN, C0 87 kN, Cur 15 kN." }, { "q": "What is the load capacity of the NKI45/25-TV-XL?", "a": "The basic dynamic load rating C is 48.5 kN and the basic static load rating C0 is 87 kN; the fatigue load limit Cur is 15 kN." }, { "q": "What is the maximum speed of the NKI45/25-TV-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 5,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI45/25-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 45 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI45-25-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×62×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI45-35-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI45-25-TV-XL", "NKI45/25-TV-XL" ], "locale_variants": {} }, { "sku": "NKI45-35-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI45/35-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 45, "D_mm": 62, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 67, "static_load_kN": 132, "fatigue_load_limit_kN": 24.3, "limiting_speed_rpm": 9200, "max_rpm": 9200, "reference_speed_rpm": 4950, "weight_g": 308, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×62×35 mm: 45 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 67 kN and C0 132 kN at the 45 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 24.3 kN, the limiting speed 9,200 r/min and the thermal reference speed 4,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.49 kN/mm and per millimetre of width 1.91 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 308 g, just 0.14 g per mm² of projected 62×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 45 mm bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons NKI45/35-TV-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 67 kN C rating and longer nominal life come without an envelope change. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 308 g in the 62 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 62 mm outside diameter and 67 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 45 mm seat, and in two-stroke and compressor piston pins the 308 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 35 mm width and the published 132 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI45/35-TV-XL?", "a": "The NKI45/35-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 62 mm outside diameter, 45 mm bore and 35 mm width, envelope 45×62×35 mm. Mass is 308 g." }, { "q": "What does the NKI45/35-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI45/35-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×62×35 mm and the catalogue ratings are C 67 kN, C0 132 kN, Cur 24.3 kN." }, { "q": "What is the load capacity of the NKI45/35-TV-XL?", "a": "The basic dynamic load rating C is 67 kN and the basic static load rating C0 is 132 kN; the fatigue load limit Cur is 24.3 kN." }, { "q": "What is the maximum speed of the NKI45/35-TV-XL?", "a": "The limiting speed is 9,200 r/min and the thermal reference speed is 4,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI45/35-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 45 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI45-25-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI45-35-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×62×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI45-35-TV-XL", "NKI45/35-TV-XL" ], "locale_variants": {} }, { "sku": "NA4909-XL", "brand": "FAG", "manufacturer_designation": "NA4909-XL", "series": "na49-series", "type": "needle", "d_mm": 45, "D_mm": 68, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 73, "fatigue_load_limit_kN": 12.9, "limiting_speed_rpm": 8600, "max_rpm": 8600, "reference_speed_rpm": 4700, "weight_g": 271, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×68×22 mm: 45 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.5 mm radial section packed with small-diameter needle rollers C is 51 kN and C0 73 kN at the 45 mm seat; the C/C0 ratio of 0.70 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 12.9 kN, the limiting speed 8,600 r/min and the thermal reference speed 4,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 2.32 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 271 g, just 0.18 g per mm² of projected 68×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 45 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22 mm width as a standard mounting space This is the choice for OEM production on soft shafts: machine the 45 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway NA4909-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 12.9 kN Cur value. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 68 mm outside diameter and 51 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 45 mm seat, and in copying and printing machine mechanisms the 271 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 22 mm width and the published 73 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NA4909-XL?", "a": "The NA4909-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 68 mm outside diameter, 45 mm bore and 22 mm width, envelope 45×68×22 mm. Mass is 271 g." }, { "q": "What does the NA4909-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4909-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×68×22 mm and the catalogue ratings are C 51 kN, C0 73 kN, Cur 12.9 kN." }, { "q": "What is the load capacity of the NA4909-XL?", "a": "The basic dynamic load rating C is 51 kN and the basic static load rating C0 is 73 kN; the fatigue load limit Cur is 12.9 kN." }, { "q": "What is the maximum speed of the NA4909-XL?", "a": "The limiting speed is 8,600 r/min and the thermal reference speed is 4,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4909-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 45 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4909", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4909-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4909-XL", "NA4909-XL" ], "locale_variants": {} }, { "sku": "NA6909-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6909-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 45, "D_mm": 68, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 79, "static_load_kN": 127, "fatigue_load_limit_kN": 21.8, "limiting_speed_rpm": 8600, "max_rpm": 8600, "reference_speed_rpm": 4750, "weight_g": 495, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×68×40 mm: 45 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.5 mm radial section packed with small-diameter needle rollers C is 79 kN and C0 127 kN at the 45 mm seat; the C/C0 ratio of 0.62 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 21.8 kN, the limiting speed 8,600 r/min and the thermal reference speed 4,750 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.76 kN/mm and per millimetre of width 1.98 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 495 g, just 0.18 g per mm² of projected 68×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 45 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 79 kN C NA6909-ZW-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required X-life status (-XL) indicates the current Schaeffler premium execution at 45 mm bore; the 127 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 40 mm-wide envelope for higher capacity at the same bore. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 68 mm outside diameter and 79 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 45 mm seat, and in motorcycle and light-vehicle transmissions the 495 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 40 mm width and the published 127 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA6909-ZW-XL?", "a": "The NA6909-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 68 mm outside diameter, 45 mm bore and 40 mm width, envelope 45×68×40 mm. Mass is 495 g." }, { "q": "What does the NA6909-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6909-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×68×40 mm and the catalogue ratings are C 79 kN, C0 127 kN, Cur 21.8 kN." }, { "q": "What is the load capacity of the NA6909-ZW-XL?", "a": "The basic dynamic load rating C is 79 kN and the basic static load rating C0 is 127 kN; the fatigue load limit Cur is 21.8 kN." }, { "q": "What is the maximum speed of the NA6909-ZW-XL?", "a": "The limiting speed is 8,600 r/min and the thermal reference speed is 4,750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6909-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 45 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6909", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×68×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6909-ZW-XL", "NA6909-ZW-XL" ], "locale_variants": {} }, { "sku": "NKIS45-XL", "brand": "FAG", "manufacturer_designation": "NKIS45-XL", "series": "nkis-series", "type": "needle", "d_mm": 45, "D_mm": 72, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 51, "static_load_kN": 74, "fatigue_load_limit_kN": 13, "limiting_speed_rpm": 8200, "max_rpm": 8200, "reference_speed_rpm": 4600, "weight_g": 336, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×72×22 mm: 45 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 13.5 mm radial section packed with small-diameter needle rollers C is 51 kN and C0 74 kN at the 45 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 13 kN, the limiting speed 8,200 r/min and the thermal reference speed 4,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 2.32 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 336 g, just 0.21 g per mm² of projected 72×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 45 mm bore marks the medium range: mounting forces and fits become critical, and the 336 g mass calls for proper induction or press tooling rather than hand fitting The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 74 kN C0 rating still assumes full rigid support under both rings The 13.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 13 kN Cur value. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 72 mm outside diameter and 51 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 45 mm seat, and in two-stroke and compressor piston pins the 336 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 22 mm width and the published 74 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKIS45-XL?", "a": "The NKIS45-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 72 mm outside diameter, 45 mm bore and 22 mm width, envelope 45×72×22 mm. Mass is 336 g." }, { "q": "What does the NKIS45-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS45-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×72×22 mm and the catalogue ratings are C 51 kN, C0 74 kN, Cur 13 kN." }, { "q": "What is the load capacity of the NKIS45-XL?", "a": "The basic dynamic load rating C is 51 kN and the basic static load rating C0 is 74 kN; the fatigue load limit Cur is 13 kN." }, { "q": "What is the maximum speed of the NKIS45-XL?", "a": "The limiting speed is 8,200 r/min and the thermal reference speed is 4,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS45-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 45 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS45", "equiv_brand": "SKF", "level": "partial", "note": "Same 45×72×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS45-XL", "NKIS45-XL" ], "locale_variants": {} }, { "sku": "NKI50-25-XL", "brand": "FAG", "manufacturer_designation": "NKI50/25-XL", "series": "nki-series", "type": "needle", "d_mm": 50, "D_mm": 68, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45.5, "static_load_kN": 82, "fatigue_load_limit_kN": 14.3, "limiting_speed_rpm": 8400, "max_rpm": 8400, "reference_speed_rpm": 4950, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×68×25 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 45.5 kN and C0 82 kN at the 50 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 14.3 kN, the limiting speed 8,400 r/min and the thermal reference speed 4,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.91 kN/mm and per millimetre of width 1.82 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 270 g, just 0.16 g per mm² of projected 68×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 50 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 82 kN C0 rating still assumes full rigid support under both rings -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 45.5 kN C rating and longer nominal life come without an envelope change. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 68 mm outside diameter and 45.5 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 50 mm seat, and in agricultural machine pivots and linkages the 270 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 25 mm width and the published 82 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI50/25-XL?", "a": "The NKI50/25-XL is a NKI machined-ring needle roller bearing with inner ring with 68 mm outside diameter, 50 mm bore and 25 mm width, envelope 50×68×25 mm. Mass is 270 g." }, { "q": "What does the NKI50/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI50/25-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×68×25 mm and the catalogue ratings are C 45.5 kN, C0 82 kN, Cur 14.3 kN." }, { "q": "What is the load capacity of the NKI50/25-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 82 kN; the fatigue load limit Cur is 14.3 kN." }, { "q": "What is the maximum speed of the NKI50/25-XL?", "a": "The limiting speed is 8,400 r/min and the thermal reference speed is 4,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI50/25-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 50 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI50-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×68×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI50-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI50-25-XL", "NKI50/25-XL" ], "locale_variants": {} }, { "sku": "NKI50-35-XL", "brand": "FAG", "manufacturer_designation": "NKI50/35-XL", "series": "nki-series", "type": "needle", "d_mm": 50, "D_mm": 68, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 60, "static_load_kN": 118, "fatigue_load_limit_kN": 21.6, "limiting_speed_rpm": 8400, "max_rpm": 8400, "reference_speed_rpm": 4900, "weight_g": 379, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×68×35 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 60 kN and C0 118 kN at the 50 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 21.6 kN, the limiting speed 8,400 r/min and the thermal reference speed 4,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.20 kN/mm and per millimetre of width 1.71 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 379 g, just 0.16 g per mm² of projected 68×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 50 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons Cur 21.6 kN, limiting speed 8,400 r/min, reference speed 4,900 r/min — the inner ring adds a few grams (total 379 g) but removes the hardening requirement The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 118 kN C0 rating still assumes full rigid support under both rings The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 50×68×35 mm envelope. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 68 mm outside diameter and 60 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 50 mm seat, and in rocker arms and valve trains the 379 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 35 mm width and the published 118 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI50/35-XL?", "a": "The NKI50/35-XL is a NKI machined-ring needle roller bearing with inner ring with 68 mm outside diameter, 50 mm bore and 35 mm width, envelope 50×68×35 mm. Mass is 379 g." }, { "q": "What does the NKI50/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI50/35-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×68×35 mm and the catalogue ratings are C 60 kN, C0 118 kN, Cur 21.6 kN." }, { "q": "What is the load capacity of the NKI50/35-XL?", "a": "The basic dynamic load rating C is 60 kN and the basic static load rating C0 is 118 kN; the fatigue load limit Cur is 21.6 kN." }, { "q": "What is the maximum speed of the NKI50/35-XL?", "a": "The limiting speed is 8,400 r/min and the thermal reference speed is 4,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI50/35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 50 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI50-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI50-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×68×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI50-35-XL", "NKI50/35-XL" ], "locale_variants": {} }, { "sku": "NA4910-XL", "brand": "FAG", "manufacturer_designation": "NA4910-XL", "series": "na49-series", "type": "needle", "d_mm": 50, "D_mm": 72, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 53, "static_load_kN": 80, "fatigue_load_limit_kN": 14.1, "limiting_speed_rpm": 7800, "max_rpm": 7800, "reference_speed_rpm": 4150, "weight_g": 274, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×72×22 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 53 kN and C0 80 kN at the 50 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 14.1 kN, the limiting speed 7,800 r/min and the thermal reference speed 4,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.06 kN/mm and per millimetre of width 2.41 kN/mm — the reason 22 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 274 g, just 0.17 g per mm² of projected 72×22 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 50 mm bore marks the medium range: mounting forces and fits become critical, and the 274 g mass calls for proper induction or press tooling rather than hand fitting This is the choice for OEM production on soft shafts: machine the 50 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 7,800 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 72 mm outside diameter and 53 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 50 mm seat, and in copying and printing machine mechanisms the 274 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 22 mm width and the published 80 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NA4910-XL?", "a": "The NA4910-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 72 mm outside diameter, 50 mm bore and 22 mm width, envelope 50×72×22 mm. Mass is 274 g." }, { "q": "What does the NA4910-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4910-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×72×22 mm and the catalogue ratings are C 53 kN, C0 80 kN, Cur 14.1 kN." }, { "q": "What is the load capacity of the NA4910-XL?", "a": "The basic dynamic load rating C is 53 kN and the basic static load rating C0 is 80 kN; the fatigue load limit Cur is 14.1 kN." }, { "q": "What is the maximum speed of the NA4910-XL?", "a": "The limiting speed is 7,800 r/min and the thermal reference speed is 4,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4910-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 50 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4910", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NA4910-2RS", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4910-XL", "NA4910-XL" ], "locale_variants": {} }, { "sku": "NA6910-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6910-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 50, "D_mm": 72, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 82, "static_load_kN": 139, "fatigue_load_limit_kN": 23.8, "limiting_speed_rpm": 7800, "max_rpm": 7800, "reference_speed_rpm": 4200, "weight_g": 515, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×72×40 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 82 kN and C0 139 kN at the 50 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 23.8 kN, the limiting speed 7,800 r/min and the thermal reference speed 4,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.64 kN/mm and per millimetre of width 2.05 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 515 g, just 0.18 g per mm² of projected 72×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 50 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 40 mm width as a standard mounting space The 11.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 50×72×40 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 40 mm width while the outside diameter stays a compact 72 mm. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 72 mm outside diameter and 82 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 50 mm seat, and in rocker arms and valve trains the 515 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 40 mm width and the published 139 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA6910-ZW-XL?", "a": "The NA6910-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 72 mm outside diameter, 50 mm bore and 40 mm width, envelope 50×72×40 mm. Mass is 515 g." }, { "q": "What does the NA6910-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6910-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×72×40 mm and the catalogue ratings are C 82 kN, C0 139 kN, Cur 23.8 kN." }, { "q": "What is the load capacity of the NA6910-ZW-XL?", "a": "The basic dynamic load rating C is 82 kN and the basic static load rating C0 is 139 kN; the fatigue load limit Cur is 23.8 kN." }, { "q": "What is the maximum speed of the NA6910-ZW-XL?", "a": "The limiting speed is 7,800 r/min and the thermal reference speed is 4,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6910-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 50 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6910", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×72×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6910-ZW-XL", "NA6910-ZW-XL" ], "locale_variants": {} }, { "sku": "NKIS50-XL", "brand": "FAG", "manufacturer_designation": "NKIS50-XL", "series": "nkis-series", "type": "needle", "d_mm": 50, "D_mm": 80, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 71, "static_load_kN": 98, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 7400, "max_rpm": 7400, "reference_speed_rpm": 4250, "weight_g": 518, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×80×28 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 71 kN and C0 98 kN at the 50 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 80 mm outside diameter the fatigue load limit Cur is 17.6 kN, the limiting speed 7,400 r/min and the thermal reference speed 4,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.42 kN/mm and per millimetre of width 2.54 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 518 g, just 0.23 g per mm² of projected 80×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 50 mm bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel NKIS50-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required X-life status (-XL) indicates the current Schaeffler premium execution at 50 mm bore; the 98 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 80 mm outside diameter and 71 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 50 mm seat, and in copying and printing machine mechanisms the 518 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 28 mm width and the published 98 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKIS50-XL?", "a": "The NKIS50-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 80 mm outside diameter, 50 mm bore and 28 mm width, envelope 50×80×28 mm. Mass is 518 g." }, { "q": "What does the NKIS50-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS50-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×80×28 mm and the catalogue ratings are C 71 kN, C0 98 kN, Cur 17.6 kN." }, { "q": "What is the load capacity of the NKIS50-XL?", "a": "The basic dynamic load rating C is 71 kN and the basic static load rating C0 is 98 kN; the fatigue load limit Cur is 17.6 kN." }, { "q": "What is the maximum speed of the NKIS50-XL?", "a": "The limiting speed is 7,400 r/min and the thermal reference speed is 4,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS50-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 50 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS50", "equiv_brand": "SKF", "level": "partial", "note": "Same 50×80×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS50-XL", "NKIS50-XL" ], "locale_variants": {} }, { "sku": "NKI55-25-TW-XL", "brand": "FAG", "manufacturer_designation": "NKI55/25-TW-XL", "series": "nki-series", "type": "needle", "d_mm": 55, "D_mm": 72, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 52, "static_load_kN": 92, "fatigue_load_limit_kN": 17.4, "limiting_speed_rpm": 7700, "max_rpm": 7700, "reference_speed_rpm": 4900, "weight_g": 255, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×72×25 mm: 55 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 52 kN and C0 92 kN at the 55 mm seat; the C/C0 ratio of 0.57 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 17.4 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.95 kN/mm and per millimetre of width 2.08 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 255 g, just 0.14 g per mm² of projected 72×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 55 mm bore marks the medium range: mounting forces and fits become critical, and the 255 g mass calls for proper induction or press tooling rather than hand fitting The 8.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 92 kN C0 rating still assumes full rigid support under both rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 17.4 kN Cur value. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 72 mm outside diameter and 52 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 55 mm seat, and in hydraulic and pneumatic pump eccentrics the 255 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 25 mm width and the published 92 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI55/25-TW-XL?", "a": "The NKI55/25-TW-XL is a NKI machined-ring needle roller bearing with inner ring with 72 mm outside diameter, 55 mm bore and 25 mm width, envelope 55×72×25 mm. Mass is 255 g." }, { "q": "What does the NKI55/25-TW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI55/25-TW-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×72×25 mm and the catalogue ratings are C 52 kN, C0 92 kN, Cur 17.4 kN." }, { "q": "What is the load capacity of the NKI55/25-TW-XL?", "a": "The basic dynamic load rating C is 52 kN and the basic static load rating C0 is 92 kN; the fatigue load limit Cur is 17.4 kN." }, { "q": "What is the maximum speed of the NKI55/25-TW-XL?", "a": "The limiting speed is 7,700 r/min and the thermal reference speed is 4,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI55/25-TW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 55 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI55-25-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI55-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI55-25-TW-XL", "NKI55/25-TW-XL" ], "locale_variants": {} }, { "sku": "NKI55-25-TV-XL", "brand": "FAG", "manufacturer_designation": "NKI55/25-TV-XL", "series": "nki-series", "type": "needle", "d_mm": 55, "D_mm": 72, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 53, "static_load_kN": 103, "fatigue_load_limit_kN": 17.8, "limiting_speed_rpm": 7700, "max_rpm": 7700, "reference_speed_rpm": 4400, "weight_g": 255, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×72×25 mm: 55 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 53 kN and C0 103 kN at the 55 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 17.8 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 2.12 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 255 g, just 0.14 g per mm² of projected 72×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 55 mm bore marks the medium range: mounting forces and fits become critical, and the 255 g mass calls for proper induction or press tooling rather than hand fitting Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 53 kN C Cur 17.8 kN, limiting speed 7,700 r/min, reference speed 4,400 r/min — the inner ring adds a few grams (total 255 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 17.8 kN Cur value. The -TV suffix specifies a glass-fibre reinforced polyamide 66 window-type cage; it spaces the rollers for low friction and is the reason the limiting speed can reach 7,700 r/min. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 72 mm outside diameter and 53 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 55 mm seat, and in planetary gear bearings the 255 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 25 mm width and the published 103 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKI55/25-TV-XL?", "a": "The NKI55/25-TV-XL is a NKI machined-ring needle roller bearing with inner ring with 72 mm outside diameter, 55 mm bore and 25 mm width, envelope 55×72×25 mm. Mass is 255 g." }, { "q": "What does the NKI55/25-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI55/25-TV-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×72×25 mm and the catalogue ratings are C 53 kN, C0 103 kN, Cur 17.8 kN." }, { "q": "What is the load capacity of the NKI55/25-TV-XL?", "a": "The basic dynamic load rating C is 53 kN and the basic static load rating C0 is 103 kN; the fatigue load limit Cur is 17.8 kN." }, { "q": "What is the maximum speed of the NKI55/25-TV-XL?", "a": "The limiting speed is 7,700 r/min and the thermal reference speed is 4,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI55/25-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 55 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI55-25-TN", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI55-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI55-25-TV-XL", "NKI55/25-TV-XL" ], "locale_variants": {} }, { "sku": "NKI55-35-XL", "brand": "FAG", "manufacturer_designation": "NKI55/35-XL", "series": "nki-series", "type": "needle", "d_mm": 55, "D_mm": 72, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63, "static_load_kN": 130, "fatigue_load_limit_kN": 23.9, "limiting_speed_rpm": 7700, "max_rpm": 7700, "reference_speed_rpm": 4550, "weight_g": 379, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×72×35 mm: 55 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 63 kN and C0 130 kN at the 55 mm seat; the C/C0 ratio of 0.48 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 72 mm outside diameter the fatigue load limit Cur is 23.9 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,550 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.15 kN/mm and per millimetre of width 1.80 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 379 g, just 0.15 g per mm² of projected 72×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 55 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 35 mm width as a standard mounting space The 8.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel NKI55/35-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 63 kN C rating and longer nominal life come without an envelope change. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 72 mm outside diameter and 63 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 55 mm seat, and in rocker arms and valve trains the 379 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 35 mm width and the published 130 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI55/35-XL?", "a": "The NKI55/35-XL is a NKI machined-ring needle roller bearing with inner ring with 72 mm outside diameter, 55 mm bore and 35 mm width, envelope 55×72×35 mm. Mass is 379 g." }, { "q": "What does the NKI55/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI55/35-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×72×35 mm and the catalogue ratings are C 63 kN, C0 130 kN, Cur 23.9 kN." }, { "q": "What is the load capacity of the NKI55/35-XL?", "a": "The basic dynamic load rating C is 63 kN and the basic static load rating C0 is 130 kN; the fatigue load limit Cur is 23.9 kN." }, { "q": "What is the maximum speed of the NKI55/35-XL?", "a": "The limiting speed is 7,700 r/min and the thermal reference speed is 4,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI55/35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 55 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI55-25-TN", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI55-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×72×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI55-35-XL", "NKI55/35-XL" ], "locale_variants": {} }, { "sku": "NA4911-XL", "brand": "FAG", "manufacturer_designation": "NA4911-XL", "series": "na49-series", "type": "needle", "d_mm": 55, "D_mm": 80, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 65, "static_load_kN": 100, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 7200, "max_rpm": 7200, "reference_speed_rpm": 4000, "weight_g": 393, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×80×25 mm: 55 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 65 kN and C0 100 kN at the 55 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 80 mm outside diameter the fatigue load limit Cur is 17.6 kN, the limiting speed 7,200 r/min and the thermal reference speed 4,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.18 kN/mm and per millimetre of width 2.60 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 393 g, just 0.20 g per mm² of projected 80×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 55 mm bore marks the medium range: mounting forces and fits become critical, and the 393 g mass calls for proper induction or press tooling rather than hand fitting The integral inner ring brings the bore to 55 mm inside the 80×25 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 100 kN C0 rating still assumes full rigid support under both rings The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 7,200 r/min limit. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 80 mm outside diameter and 65 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 55 mm seat, and in textile machine heald and cam shafts the 393 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 25 mm width and the published 100 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA4911-XL?", "a": "The NA4911-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 80 mm outside diameter, 55 mm bore and 25 mm width, envelope 55×80×25 mm. Mass is 393 g." }, { "q": "What does the NA4911-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4911-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×80×25 mm and the catalogue ratings are C 65 kN, C0 100 kN, Cur 17.6 kN." }, { "q": "What is the load capacity of the NA4911-XL?", "a": "The basic dynamic load rating C is 65 kN and the basic static load rating C0 is 100 kN; the fatigue load limit Cur is 17.6 kN." }, { "q": "What is the maximum speed of the NA4911-XL?", "a": "The limiting speed is 7,200 r/min and the thermal reference speed is 4,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4911-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 55 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4911", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4911-XL", "NA4911-XL" ], "locale_variants": {} }, { "sku": "NA6911-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6911-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 55, "D_mm": 80, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 102, "static_load_kN": 176, "fatigue_load_limit_kN": 30.5, "limiting_speed_rpm": 7200, "max_rpm": 7200, "reference_speed_rpm": 4000, "weight_g": 780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×80×45 mm: 55 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 102 kN and C0 176 kN at the 55 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 80 mm outside diameter the fatigue load limit Cur is 30.5 kN, the limiting speed 7,200 r/min and the thermal reference speed 4,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.85 kN/mm and per millimetre of width 2.27 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 780 g, just 0.22 g per mm² of projected 80×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 55 mm bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 102 kN C This is the choice for OEM production on soft shafts: machine the 55 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 55×80×45 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 45 mm width while the outside diameter stays a compact 80 mm. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 80 mm outside diameter and 102 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 55 mm seat, and in motorcycle and light-vehicle transmissions the 780 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 45 mm width and the published 176 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA6911-ZW-XL?", "a": "The NA6911-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 80 mm outside diameter, 55 mm bore and 45 mm width, envelope 55×80×45 mm. Mass is 780 g." }, { "q": "What does the NA6911-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6911-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×80×45 mm and the catalogue ratings are C 102 kN, C0 176 kN, Cur 30.5 kN." }, { "q": "What is the load capacity of the NA6911-ZW-XL?", "a": "The basic dynamic load rating C is 102 kN and the basic static load rating C0 is 176 kN; the fatigue load limit Cur is 30.5 kN." }, { "q": "What is the maximum speed of the NA6911-ZW-XL?", "a": "The limiting speed is 7,200 r/min and the thermal reference speed is 4,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6911-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 55 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6911", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×80×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6911-ZW-XL", "NA6911-ZW-XL" ], "locale_variants": {} }, { "sku": "NKIS55-XL", "brand": "FAG", "manufacturer_designation": "NKIS55-XL", "series": "nkis-series", "type": "needle", "d_mm": 55, "D_mm": 85, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 75, "static_load_kN": 108, "fatigue_load_limit_kN": 19.4, "limiting_speed_rpm": 6900, "max_rpm": 6900, "reference_speed_rpm": 4000, "weight_g": 558, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×85×28 mm: 55 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 75 kN and C0 108 kN at the 55 mm seat; the C/C0 ratio of 0.69 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 19.4 kN, the limiting speed 6,900 r/min and the thermal reference speed 4,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.36 kN/mm and per millimetre of width 2.68 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 558 g, just 0.23 g per mm² of projected 85×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 55 mm bore marks the medium range: mounting forces and fits become critical, and the 558 g mass calls for proper induction or press tooling rather than hand fitting This is the choice for OEM production on soft shafts: machine the 55 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway NKIS55-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 75 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 85 mm outside diameter and 75 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 55 mm seat, and in copying and printing machine mechanisms the 558 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 28 mm width and the published 108 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKIS55-XL?", "a": "The NKIS55-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 85 mm outside diameter, 55 mm bore and 28 mm width, envelope 55×85×28 mm. Mass is 558 g." }, { "q": "What does the NKIS55-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS55-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×85×28 mm and the catalogue ratings are C 75 kN, C0 108 kN, Cur 19.4 kN." }, { "q": "What is the load capacity of the NKIS55-XL?", "a": "The basic dynamic load rating C is 75 kN and the basic static load rating C0 is 108 kN; the fatigue load limit Cur is 19.4 kN." }, { "q": "What is the maximum speed of the NKIS55-XL?", "a": "The limiting speed is 6,900 r/min and the thermal reference speed is 4,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS55-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 55 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS55", "equiv_brand": "SKF", "level": "partial", "note": "Same 55×85×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS55-XL", "NKIS55-XL" ], "locale_variants": {} }, { "sku": "NKI60-25-XL", "brand": "FAG", "manufacturer_designation": "NKI60/25-XL", "series": "nki-series", "type": "needle", "d_mm": 60, "D_mm": 82, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 49.5, "static_load_kN": 89, "fatigue_load_limit_kN": 15.5, "limiting_speed_rpm": 6800, "max_rpm": 6800, "reference_speed_rpm": 4200, "weight_g": 394, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×82×25 mm: 60 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 49.5 kN and C0 89 kN at the 60 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 82 mm outside diameter the fatigue load limit Cur is 15.5 kN, the limiting speed 6,800 r/min and the thermal reference speed 4,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.82 kN/mm and per millimetre of width 1.98 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 394 g, just 0.19 g per mm² of projected 82×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 60 mm bore places this bearing in the medium band, where the 82 mm envelope already carries ratings in the tens of kilonewtons The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 89 kN C0 rating still assumes full rigid support under both rings The 11.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 60×82×25 mm envelope. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 82 mm outside diameter and 49.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 60 mm seat, and in motorcycle and light-vehicle transmissions the 394 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 25 mm width and the published 89 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI60/25-XL?", "a": "The NKI60/25-XL is a NKI machined-ring needle roller bearing with inner ring with 82 mm outside diameter, 60 mm bore and 25 mm width, envelope 60×82×25 mm. Mass is 394 g." }, { "q": "What does the NKI60/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI60/25-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×82×25 mm and the catalogue ratings are C 49.5 kN, C0 89 kN, Cur 15.5 kN." }, { "q": "What is the load capacity of the NKI60/25-XL?", "a": "The basic dynamic load rating C is 49.5 kN and the basic static load rating C0 is 89 kN; the fatigue load limit Cur is 15.5 kN." }, { "q": "What is the maximum speed of the NKI60/25-XL?", "a": "The limiting speed is 6,800 r/min and the thermal reference speed is 4,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI60/25-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 60 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI60-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×82×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI60-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI60-25-XL", "NKI60/25-XL" ], "locale_variants": {} }, { "sku": "NKI60-35-XL", "brand": "FAG", "manufacturer_designation": "NKI60/35-XL", "series": "nki-series", "type": "needle", "d_mm": 60, "D_mm": 82, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 70, "static_load_kN": 139, "fatigue_load_limit_kN": 26, "limiting_speed_rpm": 6800, "max_rpm": 6800, "reference_speed_rpm": 4050, "weight_g": 553, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×82×35 mm: 60 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 11.0 mm radial section packed with small-diameter needle rollers C is 70 kN and C0 139 kN at the 60 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 82 mm outside diameter the fatigue load limit Cur is 26 kN, the limiting speed 6,800 r/min and the thermal reference speed 4,050 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.17 kN/mm and per millimetre of width 2.00 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 553 g, just 0.19 g per mm² of projected 82×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 60 mm bore places this bearing in the medium band, where the 82 mm envelope already carries ratings in the tens of kilonewtons Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 70 kN C Cur 26 kN, limiting speed 6,800 r/min, reference speed 4,050 r/min — the inner ring adds a few grams (total 553 g) but removes the hardening requirement The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 6,800 r/min limit. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 82 mm outside diameter and 70 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 60 mm seat, and in gearbox selector and change linkages the 553 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 35 mm width and the published 139 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NKI60/35-XL?", "a": "The NKI60/35-XL is a NKI machined-ring needle roller bearing with inner ring with 82 mm outside diameter, 60 mm bore and 35 mm width, envelope 60×82×35 mm. Mass is 553 g." }, { "q": "What does the NKI60/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI60/35-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×82×35 mm and the catalogue ratings are C 70 kN, C0 139 kN, Cur 26 kN." }, { "q": "What is the load capacity of the NKI60/35-XL?", "a": "The basic dynamic load rating C is 70 kN and the basic static load rating C0 is 139 kN; the fatigue load limit Cur is 26 kN." }, { "q": "What is the maximum speed of the NKI60/35-XL?", "a": "The limiting speed is 6,800 r/min and the thermal reference speed is 4,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI60/35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 60 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI60-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI60-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×82×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI60-35-XL", "NKI60/35-XL" ], "locale_variants": {} }, { "sku": "NA4912-XL", "brand": "FAG", "manufacturer_designation": "NA4912-XL", "series": "na49-series", "type": "needle", "d_mm": 60, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 108, "fatigue_load_limit_kN": 19.1, "limiting_speed_rpm": 6700, "max_rpm": 6700, "reference_speed_rpm": 3700, "weight_g": 426, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×85×25 mm: 60 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 68 kN and C0 108 kN at the 60 mm seat; the C/C0 ratio of 0.63 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 19.1 kN, the limiting speed 6,700 r/min and the thermal reference speed 3,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 2.72 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 426 g, just 0.20 g per mm² of projected 85×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 60 mm bore marks the medium range: mounting forces and fits become critical, and the 426 g mass calls for proper induction or press tooling rather than hand fitting The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 108 kN C0 rating still assumes full rigid support under both rings NA4912-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 6,700 r/min limit. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 85 mm outside diameter and 68 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 60 mm seat, and in two-stroke and compressor piston pins the 426 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 25 mm width and the published 108 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NA4912-XL?", "a": "The NA4912-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 85 mm outside diameter, 60 mm bore and 25 mm width, envelope 60×85×25 mm. Mass is 426 g." }, { "q": "What does the NA4912-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4912-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×85×25 mm and the catalogue ratings are C 68 kN, C0 108 kN, Cur 19.1 kN." }, { "q": "What is the load capacity of the NA4912-XL?", "a": "The basic dynamic load rating C is 68 kN and the basic static load rating C0 is 108 kN; the fatigue load limit Cur is 19.1 kN." }, { "q": "What is the maximum speed of the NA4912-XL?", "a": "The limiting speed is 6,700 r/min and the thermal reference speed is 3,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4912-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 60 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4912-XL", "NA4912-XL" ], "locale_variants": {} }, { "sku": "NA6912-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6912-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 60, "D_mm": 85, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 191, "fatigue_load_limit_kN": 33, "limiting_speed_rpm": 6700, "max_rpm": 6700, "reference_speed_rpm": 3700, "weight_g": 808, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×85×45 mm: 60 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 106 kN and C0 191 kN at the 60 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 33 kN, the limiting speed 6,700 r/min and the thermal reference speed 3,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.77 kN/mm and per millimetre of width 2.36 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 808 g, just 0.21 g per mm² of projected 85×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 60 mm bore places this bearing in the medium band, where the 85 mm envelope already carries ratings in the tens of kilonewtons Cur 33 kN, limiting speed 6,700 r/min, reference speed 3,700 r/min — the inner ring adds a few grams (total 808 g) but removes the hardening requirement The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 191 kN C0 rating still assumes full rigid support under both rings The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 60×85×45 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 45 mm width while the outside diameter stays a compact 85 mm. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 85 mm outside diameter and 106 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 60 mm seat, and in connecting-rod small ends the 808 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 45 mm width and the published 191 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA6912-ZW-XL?", "a": "The NA6912-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 85 mm outside diameter, 60 mm bore and 45 mm width, envelope 60×85×45 mm. Mass is 808 g." }, { "q": "What does the NA6912-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6912-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×85×45 mm and the catalogue ratings are C 106 kN, C0 191 kN, Cur 33 kN." }, { "q": "What is the load capacity of the NA6912-ZW-XL?", "a": "The basic dynamic load rating C is 106 kN and the basic static load rating C0 is 191 kN; the fatigue load limit Cur is 33 kN." }, { "q": "What is the maximum speed of the NA6912-ZW-XL?", "a": "The limiting speed is 6,700 r/min and the thermal reference speed is 3,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6912-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 60 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6912", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×85×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6912-ZW-XL", "NA6912-ZW-XL" ], "locale_variants": {} }, { "sku": "NKIS60-XL", "brand": "FAG", "manufacturer_designation": "NKIS60-XL", "series": "nkis-series", "type": "needle", "d_mm": 60, "D_mm": 90, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 77, "static_load_kN": 113, "fatigue_load_limit_kN": 20.4, "limiting_speed_rpm": 6400, "max_rpm": 6400, "reference_speed_rpm": 3800, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×90×28 mm: 60 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 77 kN and C0 113 kN at the 60 mm seat; the C/C0 ratio of 0.68 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 20.4 kN, the limiting speed 6,400 r/min and the thermal reference speed 3,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.28 kN/mm and per millimetre of width 2.75 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 560 g, just 0.22 g per mm² of projected 90×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 60 mm bore places this bearing in the medium band, where the 90 mm envelope already carries ratings in the tens of kilonewtons Reading the NKIS prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 77 kN C As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 20.4 kN Cur value. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 90 mm outside diameter and 77 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 60 mm seat, and in motorcycle and light-vehicle transmissions the 560 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 28 mm width and the published 113 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKIS60-XL?", "a": "The NKIS60-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 90 mm outside diameter, 60 mm bore and 28 mm width, envelope 60×90×28 mm. Mass is 560 g." }, { "q": "What does the NKIS60-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS60-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×90×28 mm and the catalogue ratings are C 77 kN, C0 113 kN, Cur 20.4 kN." }, { "q": "What is the load capacity of the NKIS60-XL?", "a": "The basic dynamic load rating C is 77 kN and the basic static load rating C0 is 113 kN; the fatigue load limit Cur is 20.4 kN." }, { "q": "What is the maximum speed of the NKIS60-XL?", "a": "The limiting speed is 6,400 r/min and the thermal reference speed is 3,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS60-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 60 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS60", "equiv_brand": "SKF", "level": "partial", "note": "Same 60×90×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=961", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS60-XL", "NKIS60-XL" ], "locale_variants": {} }, { "sku": "NKI65-25-XL", "brand": "FAG", "manufacturer_designation": "NKI65/25-XL", "series": "nki-series", "type": "needle", "d_mm": 65, "D_mm": 90, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 60, "static_load_kN": 100, "fatigue_load_limit_kN": 17.9, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 3900, "weight_g": 467, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×90×25 mm: 65 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 60 kN and C0 100 kN at the 65 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 17.9 kN, the limiting speed 6,300 r/min and the thermal reference speed 3,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 2.40 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 467 g, just 0.21 g per mm² of projected 90×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 65 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery NKI65/25-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required This is the choice for OEM production on soft shafts: machine the 65 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 60 kN C rating and longer nominal life come without an envelope change. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 90 mm outside diameter and 60 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 65 mm seat, and in connecting-rod small ends the 467 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 25 mm width and the published 100 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI65/25-XL?", "a": "The NKI65/25-XL is a NKI machined-ring needle roller bearing with inner ring with 90 mm outside diameter, 65 mm bore and 25 mm width, envelope 65×90×25 mm. Mass is 467 g." }, { "q": "What does the NKI65/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI65/25-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×90×25 mm and the catalogue ratings are C 60 kN, C0 100 kN, Cur 17.9 kN." }, { "q": "What is the load capacity of the NKI65/25-XL?", "a": "The basic dynamic load rating C is 60 kN and the basic static load rating C0 is 100 kN; the fatigue load limit Cur is 17.9 kN." }, { "q": "What is the maximum speed of the NKI65/25-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 3,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI65/25-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 65 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI65-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI65-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI65-25-XL", "NKI65/25-XL" ], "locale_variants": {} }, { "sku": "NKI65-35-XL", "brand": "FAG", "manufacturer_designation": "NKI65/35-XL", "series": "nki-series", "type": "needle", "d_mm": 65, "D_mm": 90, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 85, "static_load_kN": 156, "fatigue_load_limit_kN": 27.5, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 3750, "weight_g": 659, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×90×35 mm: 65 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 85 kN and C0 156 kN at the 65 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 27.5 kN, the limiting speed 6,300 r/min and the thermal reference speed 3,750 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.31 kN/mm and per millimetre of width 2.43 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 659 g, just 0.21 g per mm² of projected 90×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 65 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 156 kN C0 rating still assumes full rigid support under both rings NKI65/35-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 65×90×35 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 90 mm outside diameter and 85 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 65 mm seat, and in planetary gear bearings the 659 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 35 mm width and the published 156 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI65/35-XL?", "a": "The NKI65/35-XL is a NKI machined-ring needle roller bearing with inner ring with 90 mm outside diameter, 65 mm bore and 35 mm width, envelope 65×90×35 mm. Mass is 659 g." }, { "q": "What does the NKI65/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI65/35-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×90×35 mm and the catalogue ratings are C 85 kN, C0 156 kN, Cur 27.5 kN." }, { "q": "What is the load capacity of the NKI65/35-XL?", "a": "The basic dynamic load rating C is 85 kN and the basic static load rating C0 is 156 kN; the fatigue load limit Cur is 27.5 kN." }, { "q": "What is the maximum speed of the NKI65/35-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 3,750 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI65/35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 65 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI65-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI65-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI65-35-XL", "NKI65/35-XL" ], "locale_variants": {} }, { "sku": "NA4913-XL", "brand": "FAG", "manufacturer_designation": "NA4913-XL", "series": "na49-series", "type": "needle", "d_mm": 65, "D_mm": 90, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69, "static_load_kN": 112, "fatigue_load_limit_kN": 19.9, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 3500, "weight_g": 456, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×90×25 mm: 65 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 69 kN and C0 112 kN at the 65 mm seat; the C/C0 ratio of 0.62 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 19.9 kN, the limiting speed 6,300 r/min and the thermal reference speed 3,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.06 kN/mm and per millimetre of width 2.76 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 456 g, just 0.20 g per mm² of projected 90×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 65 mm bore this is a heavy-industrial bearing: 456 g of stiff ring and roller set, specified where rigidity matters more than speed Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 69 kN C NA4913-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required X-life status (-XL) indicates the current Schaeffler premium execution at 65 mm bore; the 112 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 90 mm outside diameter and 69 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 65 mm seat, and in agricultural machine pivots and linkages the 456 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 25 mm width and the published 112 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA4913-XL?", "a": "The NA4913-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 90 mm outside diameter, 65 mm bore and 25 mm width, envelope 65×90×25 mm. Mass is 456 g." }, { "q": "What does the NA4913-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4913-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×90×25 mm and the catalogue ratings are C 69 kN, C0 112 kN, Cur 19.9 kN." }, { "q": "What is the load capacity of the NA4913-XL?", "a": "The basic dynamic load rating C is 69 kN and the basic static load rating C0 is 112 kN; the fatigue load limit Cur is 19.9 kN." }, { "q": "What is the maximum speed of the NA4913-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 3,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4913-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 65 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4913", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4913-XL", "NA4913-XL" ], "locale_variants": {} }, { "sku": "NA6913-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6913-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 65, "D_mm": 90, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 108, "static_load_kN": 198, "fatigue_load_limit_kN": 34.5, "limiting_speed_rpm": 6300, "max_rpm": 6300, "reference_speed_rpm": 3550, "weight_g": 833, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×90×45 mm: 65 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 108 kN and C0 198 kN at the 65 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 34.5 kN, the limiting speed 6,300 r/min and the thermal reference speed 3,550 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.66 kN/mm and per millimetre of width 2.40 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 833 g, just 0.21 g per mm² of projected 90×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 65 mm bore this is a heavy-industrial bearing: 833 g of stiff ring and roller set, specified where rigidity matters more than speed The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 198 kN C0 rating still assumes full rigid support under both rings This is the choice for OEM production on soft shafts: machine the 65 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 65×90×45 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 45 mm width while the outside diameter stays a compact 90 mm. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 90 mm outside diameter and 108 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 65 mm seat, and in agricultural machine pivots and linkages the 833 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 45 mm width and the published 198 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA6913-ZW-XL?", "a": "The NA6913-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 90 mm outside diameter, 65 mm bore and 45 mm width, envelope 65×90×45 mm. Mass is 833 g." }, { "q": "What does the NA6913-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6913-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×90×45 mm and the catalogue ratings are C 108 kN, C0 198 kN, Cur 34.5 kN." }, { "q": "What is the load capacity of the NA6913-ZW-XL?", "a": "The basic dynamic load rating C is 108 kN and the basic static load rating C0 is 198 kN; the fatigue load limit Cur is 34.5 kN." }, { "q": "What is the maximum speed of the NA6913-ZW-XL?", "a": "The limiting speed is 6,300 r/min and the thermal reference speed is 3,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6913-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 65 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6913", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×90×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6913-ZW-XL", "NA6913-ZW-XL" ], "locale_variants": {} }, { "sku": "NKIS65-XL", "brand": "FAG", "manufacturer_designation": "NKIS65-XL", "series": "nkis-series", "type": "needle", "d_mm": 65, "D_mm": 95, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 81, "static_load_kN": 123, "fatigue_load_limit_kN": 22.2, "limiting_speed_rpm": 6000, "max_rpm": 6000, "reference_speed_rpm": 3600, "weight_g": 641, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×95×28 mm: 65 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 81 kN and C0 123 kN at the 65 mm seat; the C/C0 ratio of 0.66 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 95 mm outside diameter the fatigue load limit Cur is 22.2 kN, the limiting speed 6,000 r/min and the thermal reference speed 3,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.25 kN/mm and per millimetre of width 2.89 kN/mm — the reason 28 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 641 g, just 0.24 g per mm² of projected 95×28 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 65 mm bore this is a heavy-industrial bearing: 641 g of stiff ring and roller set, specified where rigidity matters more than speed Cur 22.2 kN, limiting speed 6,000 r/min, reference speed 3,600 r/min — the inner ring adds a few grams (total 641 g) but removes the hardening requirement The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 81 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 95 mm outside diameter and 81 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 65 mm seat, and in hydraulic and pneumatic pump eccentrics the 641 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 28 mm width and the published 123 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKIS65-XL?", "a": "The NKIS65-XL is a NKIS heavy-section machined-ring needle roller bearing with inner ring with 95 mm outside diameter, 65 mm bore and 28 mm width, envelope 65×95×28 mm. Mass is 641 g." }, { "q": "What does the NKIS65-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKIS65-XL identifies this NKIS heavy-section machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×95×28 mm and the catalogue ratings are C 81 kN, C0 123 kN, Cur 22.2 kN." }, { "q": "What is the load capacity of the NKIS65-XL?", "a": "The basic dynamic load rating C is 81 kN and the basic static load rating C0 is 123 kN; the fatigue load limit Cur is 22.2 kN." }, { "q": "What is the maximum speed of the NKIS65-XL?", "a": "The limiting speed is 6,000 r/min and the thermal reference speed is 3,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKIS65-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 65 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKIS65", "equiv_brand": "SKF", "level": "partial", "note": "Same 65×95×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKIS65-XL", "NKIS65-XL" ], "locale_variants": {} }, { "sku": "NKI70-25-XL", "brand": "FAG", "manufacturer_designation": "NKI70/25-XL", "series": "nki-series", "type": "needle", "d_mm": 70, "D_mm": 95, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 63, "static_load_kN": 119, "fatigue_load_limit_kN": 20, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3500, "weight_g": 521, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×95×25 mm: 70 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 63 kN and C0 119 kN at the 70 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 95 mm outside diameter the fatigue load limit Cur is 20 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.90 kN/mm and per millimetre of width 2.52 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 521 g, just 0.22 g per mm² of projected 95×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 70 mm bore this is a heavy-industrial bearing: 521 g of stiff ring and roller set, specified where rigidity matters more than speed Cur 20 kN, limiting speed 5,800 r/min, reference speed 3,500 r/min — the inner ring adds a few grams (total 521 g) but removes the hardening requirement The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 119 kN C0 rating still assumes full rigid support under both rings The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 5,800 r/min limit. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 95 mm outside diameter and 63 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 70 mm seat, and in rocker arms and valve trains the 521 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 25 mm width and the published 119 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI70/25-XL?", "a": "The NKI70/25-XL is a NKI machined-ring needle roller bearing with inner ring with 95 mm outside diameter, 70 mm bore and 25 mm width, envelope 70×95×25 mm. Mass is 521 g." }, { "q": "What does the NKI70/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI70/25-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×95×25 mm and the catalogue ratings are C 63 kN, C0 119 kN, Cur 20 kN." }, { "q": "What is the load capacity of the NKI70/25-XL?", "a": "The basic dynamic load rating C is 63 kN and the basic static load rating C0 is 119 kN; the fatigue load limit Cur is 20 kN." }, { "q": "What is the maximum speed of the NKI70/25-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI70/25-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 70 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI70-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×95×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI70-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI70-25-XL", "NKI70/25-XL" ], "locale_variants": {} }, { "sku": "NKI70-35-XL", "brand": "FAG", "manufacturer_designation": "NKI70/35-XL", "series": "nki-series", "type": "needle", "d_mm": 70, "D_mm": 95, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 89, "static_load_kN": 184, "fatigue_load_limit_kN": 33, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3350, "weight_g": 737, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×95×35 mm: 70 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 12.5 mm radial section packed with small-diameter needle rollers C is 89 kN and C0 184 kN at the 70 mm seat; the C/C0 ratio of 0.48 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 95 mm outside diameter the fatigue load limit Cur is 33 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,350 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.27 kN/mm and per millimetre of width 2.54 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 737 g, just 0.22 g per mm² of projected 95×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 70 mm bore this is a heavy-industrial bearing: 737 g of stiff ring and roller set, specified where rigidity matters more than speed Cur 33 kN, limiting speed 5,800 r/min, reference speed 3,350 r/min — the inner ring adds a few grams (total 737 g) but removes the hardening requirement Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 89 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 70 mm bore; the 184 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 95 mm outside diameter and 89 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 70 mm seat, and in hydraulic and pneumatic pump eccentrics the 737 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 35 mm width and the published 184 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI70/35-XL?", "a": "The NKI70/35-XL is a NKI machined-ring needle roller bearing with inner ring with 95 mm outside diameter, 70 mm bore and 35 mm width, envelope 70×95×35 mm. Mass is 737 g." }, { "q": "What does the NKI70/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI70/35-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×95×35 mm and the catalogue ratings are C 89 kN, C0 184 kN, Cur 33 kN." }, { "q": "What is the load capacity of the NKI70/35-XL?", "a": "The basic dynamic load rating C is 89 kN and the basic static load rating C0 is 184 kN; the fatigue load limit Cur is 33 kN." }, { "q": "What is the maximum speed of the NKI70/35-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI70/35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 70 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI70-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI70-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×95×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI70-35-XL", "NKI70/35-XL" ], "locale_variants": {} }, { "sku": "NA4914-XL", "brand": "FAG", "manufacturer_designation": "NA4914-XL", "series": "na49-series", "type": "needle", "d_mm": 70, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 95, "static_load_kN": 156, "fatigue_load_limit_kN": 28, "limiting_speed_rpm": 5700, "max_rpm": 5700, "reference_speed_rpm": 3250, "weight_g": 728, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×100×30 mm: 70 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 95 kN and C0 156 kN at the 70 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 100 mm outside diameter the fatigue load limit Cur is 28 kN, the limiting speed 5,700 r/min and the thermal reference speed 3,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.36 kN/mm and per millimetre of width 3.17 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 728 g, just 0.24 g per mm² of projected 100×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 70 mm bore the 100 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,700 r/min The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel X-life status (-XL) indicates the current Schaeffler premium execution at 70 mm bore; the 156 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 100 mm outside diameter and 95 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 70 mm seat, and in connecting-rod small ends the 728 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 156 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4914-XL?", "a": "The NA4914-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 100 mm outside diameter, 70 mm bore and 30 mm width, envelope 70×100×30 mm. Mass is 728 g." }, { "q": "What does the NA4914-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4914-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×100×30 mm and the catalogue ratings are C 95 kN, C0 156 kN, Cur 28 kN." }, { "q": "What is the load capacity of the NA4914-XL?", "a": "The basic dynamic load rating C is 95 kN and the basic static load rating C0 is 156 kN; the fatigue load limit Cur is 28 kN." }, { "q": "What is the maximum speed of the NA4914-XL?", "a": "The limiting speed is 5,700 r/min and the thermal reference speed is 3,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4914-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 70 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4914-XL", "NA4914-XL" ], "locale_variants": {} }, { "sku": "NA6914-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6914-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 70, "D_mm": 100, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 145, "static_load_kN": 265, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 5700, "max_rpm": 5700, "reference_speed_rpm": 3300, "weight_g": 1340, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×100×54 mm: 70 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 145 kN and C0 265 kN at the 70 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 100 mm outside diameter the fatigue load limit Cur is 48 kN, the limiting speed 5,700 r/min and the thermal reference speed 3,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.07 kN/mm and per millimetre of width 2.69 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.34 kg (1340 g), just 0.25 g per mm² of projected 100×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 70 mm bore this is a heavy-industrial bearing: 1.34 kg of stiff ring and roller set, specified where rigidity matters more than speed The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel This is the choice for OEM production on soft shafts: machine the 70 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 145 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 265 kN in this thin-section bearing — two rows support the static peak that a single row could not. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 100 mm outside diameter and 145 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 70 mm seat, and in small electric motor accessory drives the 1.34 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 54 mm width and the published 265 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA6914-ZW-XL?", "a": "The NA6914-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 100 mm outside diameter, 70 mm bore and 54 mm width, envelope 70×100×54 mm. Mass is 1.34 kg." }, { "q": "What does the NA6914-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6914-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×100×54 mm and the catalogue ratings are C 145 kN, C0 265 kN, Cur 48 kN." }, { "q": "What is the load capacity of the NA6914-ZW-XL?", "a": "The basic dynamic load rating C is 145 kN and the basic static load rating C0 is 265 kN; the fatigue load limit Cur is 48 kN." }, { "q": "What is the maximum speed of the NA6914-ZW-XL?", "a": "The limiting speed is 5,700 r/min and the thermal reference speed is 3,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6914-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 70 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6914", "equiv_brand": "SKF", "level": "partial", "note": "Same 70×100×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6914-ZW-XL", "NA6914-ZW-XL" ], "locale_variants": {} }, { "sku": "NKI75-25-XL", "brand": "FAG", "manufacturer_designation": "NKI75/25-XL", "series": "nki-series", "type": "needle", "d_mm": 75, "D_mm": 105, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 78, "static_load_kN": 123, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3300, "weight_g": 641, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×105×25 mm: 75 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 78 kN and C0 123 kN at the 75 mm seat; the C/C0 ratio of 0.63 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 22.1 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.04 kN/mm and per millimetre of width 3.12 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 641 g, just 0.24 g per mm² of projected 105×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 75 mm bore this is a heavy-industrial bearing: 641 g of stiff ring and roller set, specified where rigidity matters more than speed This is the choice for OEM production on soft shafts: machine the 75 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 75×105×25 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 105 mm outside diameter and 78 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 75 mm seat, and in two-stroke and compressor piston pins the 641 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 25 mm width and the published 123 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI75/25-XL?", "a": "The NKI75/25-XL is a NKI machined-ring needle roller bearing with inner ring with 105 mm outside diameter, 75 mm bore and 25 mm width, envelope 75×105×25 mm. Mass is 641 g." }, { "q": "What does the NKI75/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI75/25-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×105×25 mm and the catalogue ratings are C 78 kN, C0 123 kN, Cur 22.1 kN." }, { "q": "What is the load capacity of the NKI75/25-XL?", "a": "The basic dynamic load rating C is 78 kN and the basic static load rating C0 is 123 kN; the fatigue load limit Cur is 22.1 kN." }, { "q": "What is the maximum speed of the NKI75/25-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI75/25-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 75 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI75-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI75-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI75-25-XL", "NKI75/25-XL" ], "locale_variants": {} }, { "sku": "NKI75-35-XL", "brand": "FAG", "manufacturer_designation": "NKI75/35-XL", "series": "nki-series", "type": "needle", "d_mm": 75, "D_mm": 105, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 111, "static_load_kN": 193, "fatigue_load_limit_kN": 35, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3200, "weight_g": 908, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×105×35 mm: 75 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 111 kN and C0 193 kN at the 75 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 35 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.48 kN/mm and per millimetre of width 3.17 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 908 g, just 0.25 g per mm² of projected 105×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 75 mm bore this is a heavy-industrial bearing: 908 g of stiff ring and roller set, specified where rigidity matters more than speed Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 111 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 5,400 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 105 mm outside diameter and 111 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 75 mm seat, and in copying and printing machine mechanisms the 908 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 35 mm width and the published 193 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI75/35-XL?", "a": "The NKI75/35-XL is a NKI machined-ring needle roller bearing with inner ring with 105 mm outside diameter, 75 mm bore and 35 mm width, envelope 75×105×35 mm. Mass is 908 g." }, { "q": "What does the NKI75/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI75/35-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×105×35 mm and the catalogue ratings are C 111 kN, C0 193 kN, Cur 35 kN." }, { "q": "What is the load capacity of the NKI75/35-XL?", "a": "The basic dynamic load rating C is 111 kN and the basic static load rating C0 is 193 kN; the fatigue load limit Cur is 35 kN." }, { "q": "What is the maximum speed of the NKI75/35-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI75/35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 75 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI75-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI75-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI75-35-XL", "NKI75/35-XL" ], "locale_variants": {} }, { "sku": "NA4915-XL", "brand": "FAG", "manufacturer_designation": "NA4915-XL", "series": "na49-series", "type": "needle", "d_mm": 75, "D_mm": 105, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 97, "static_load_kN": 162, "fatigue_load_limit_kN": 29, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3100, "weight_g": 775, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×105×30 mm: 75 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 97 kN and C0 162 kN at the 75 mm seat; the C/C0 ratio of 0.60 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 29 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.29 kN/mm and per millimetre of width 3.23 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 775 g, just 0.25 g per mm² of projected 105×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 75 mm bore the 105 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,400 r/min Cur 29 kN, limiting speed 5,400 r/min, reference speed 3,100 r/min — the inner ring adds a few grams (total 775 g) but removes the hardening requirement The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel X-life status (-XL) indicates the current Schaeffler premium execution at 75 mm bore; the 162 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 105 mm outside diameter and 97 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 75 mm seat, and in rocker arms and valve trains the 775 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 30 mm width and the published 162 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4915-XL?", "a": "The NA4915-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 105 mm outside diameter, 75 mm bore and 30 mm width, envelope 75×105×30 mm. Mass is 775 g." }, { "q": "What does the NA4915-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4915-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×105×30 mm and the catalogue ratings are C 97 kN, C0 162 kN, Cur 29 kN." }, { "q": "What is the load capacity of the NA4915-XL?", "a": "The basic dynamic load rating C is 97 kN and the basic static load rating C0 is 162 kN; the fatigue load limit Cur is 29 kN." }, { "q": "What is the maximum speed of the NA4915-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4915-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 75 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4915-XL", "NA4915-XL" ], "locale_variants": {} }, { "sku": "NA6915-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6915-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 75, "D_mm": 105, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 147, "static_load_kN": 275, "fatigue_load_limit_kN": 50, "limiting_speed_rpm": 5400, "max_rpm": 5400, "reference_speed_rpm": 3150, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 75×105×54 mm: 75 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 147 kN and C0 275 kN at the 75 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 50 kN, the limiting speed 5,400 r/min and the thermal reference speed 3,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.96 kN/mm and per millimetre of width 2.72 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.45 kg (1450 g), just 0.26 g per mm² of projected 105×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 75 mm bore the 105 mm outside diameter and 54 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,400 r/min NA6915-ZW-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NA69 prefix: machined-ring needle bearing with inner ring, two roller rows, capable of pure radial load at 147 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 147 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 275 kN in this thin-section bearing — two rows support the static peak that a single row could not. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 105 mm outside diameter and 147 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 75 mm seat, and in two-stroke and compressor piston pins the 1.45 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 54 mm width and the published 275 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA6915-ZW-XL?", "a": "The NA6915-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 105 mm outside diameter, 75 mm bore and 54 mm width, envelope 75×105×54 mm. Mass is 1.45 kg." }, { "q": "What does the NA6915-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6915-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 75×105×54 mm and the catalogue ratings are C 147 kN, C0 275 kN, Cur 50 kN." }, { "q": "What is the load capacity of the NA6915-ZW-XL?", "a": "The basic dynamic load rating C is 147 kN and the basic static load rating C0 is 275 kN; the fatigue load limit Cur is 50 kN." }, { "q": "What is the maximum speed of the NA6915-ZW-XL?", "a": "The limiting speed is 5,400 r/min and the thermal reference speed is 3,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6915-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 75 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6915", "equiv_brand": "SKF", "level": "partial", "note": "Same 75×105×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6915-ZW-XL", "NA6915-ZW-XL" ], "locale_variants": {} }, { "sku": "NKI80-25-XL", "brand": "FAG", "manufacturer_designation": "NKI80/25-XL", "series": "nki-series", "type": "needle", "d_mm": 80, "D_mm": 110, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 81, "static_load_kN": 132, "fatigue_load_limit_kN": 23.7, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 3150, "weight_g": 677, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×25 mm: 80 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 81 kN and C0 132 kN at the 80 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 23.7 kN, the limiting speed 5,100 r/min and the thermal reference speed 3,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 3.24 kN/mm — the reason 25 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 677 g, just 0.25 g per mm² of projected 110×25 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 80 mm bore the 110 mm outside diameter and 25 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,100 r/min Cur 23.7 kN, limiting speed 5,100 r/min, reference speed 3,150 r/min — the inner ring adds a few grams (total 677 g) but removes the hardening requirement The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel X-life status (-XL) indicates the current Schaeffler premium execution at 80 mm bore; the 132 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 110 mm outside diameter and 81 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 80 mm seat, and in planetary gear bearings the 677 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 25 mm width and the published 132 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI80/25-XL?", "a": "The NKI80/25-XL is a NKI machined-ring needle roller bearing with inner ring with 110 mm outside diameter, 80 mm bore and 25 mm width, envelope 80×110×25 mm. Mass is 677 g." }, { "q": "What does the NKI80/25-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI80/25-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×110×25 mm and the catalogue ratings are C 81 kN, C0 132 kN, Cur 23.7 kN." }, { "q": "What is the load capacity of the NKI80/25-XL?", "a": "The basic dynamic load rating C is 81 kN and the basic static load rating C0 is 132 kN; the fatigue load limit Cur is 23.7 kN." }, { "q": "What is the maximum speed of the NKI80/25-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 3,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI80/25-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 80 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI80-25", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI80-35", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI80-25-XL", "NKI80/25-XL" ], "locale_variants": {} }, { "sku": "NKI80-35-XL", "brand": "FAG", "manufacturer_designation": "NKI80/35-XL", "series": "nki-series", "type": "needle", "d_mm": 80, "D_mm": 110, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 116, "static_load_kN": 208, "fatigue_load_limit_kN": 38, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 3050, "weight_g": 959, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×35 mm: 80 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 116 kN and C0 208 kN at the 80 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 38 kN, the limiting speed 5,100 r/min and the thermal reference speed 3,050 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.45 kN/mm and per millimetre of width 3.31 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 959 g, just 0.25 g per mm² of projected 110×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 80 mm bore the 110 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,100 r/min Cur 38 kN, limiting speed 5,100 r/min, reference speed 3,050 r/min — the inner ring adds a few grams (total 959 g) but removes the hardening requirement This is the choice for OEM production on soft shafts: machine the 80 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 38 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 110 mm outside diameter and 116 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 80 mm seat, and in textile machine heald and cam shafts the 959 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 35 mm width and the published 208 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NKI80/35-XL?", "a": "The NKI80/35-XL is a NKI machined-ring needle roller bearing with inner ring with 110 mm outside diameter, 80 mm bore and 35 mm width, envelope 80×110×35 mm. Mass is 959 g." }, { "q": "What does the NKI80/35-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI80/35-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×110×35 mm and the catalogue ratings are C 116 kN, C0 208 kN, Cur 38 kN." }, { "q": "What is the load capacity of the NKI80/35-XL?", "a": "The basic dynamic load rating C is 116 kN and the basic static load rating C0 is 208 kN; the fatigue load limit Cur is 38 kN." }, { "q": "What is the maximum speed of the NKI80/35-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 3,050 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI80/35-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 80 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI80-25", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI80-35", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI80-35-XL", "NKI80/35-XL" ], "locale_variants": {} }, { "sku": "NA4916-XL", "brand": "FAG", "manufacturer_designation": "NA4916-XL", "series": "na49-series", "type": "needle", "d_mm": 80, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 101, "static_load_kN": 174, "fatigue_load_limit_kN": 31, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 2900, "weight_g": 878, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×30 mm: 80 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 101 kN and C0 174 kN at the 80 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 31 kN, the limiting speed 5,100 r/min and the thermal reference speed 2,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.26 kN/mm and per millimetre of width 3.37 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 878 g, just 0.27 g per mm² of projected 110×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 80 mm bore the 110 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,100 r/min The integral inner ring brings the bore to 80 mm inside the 110×30 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Cur 31 kN, limiting speed 5,100 r/min, reference speed 2,900 r/min — the inner ring adds a few grams (total 878 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 31 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 110 mm outside diameter and 101 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 80 mm seat, and in textile machine heald and cam shafts the 878 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 174 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4916-XL?", "a": "The NA4916-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 110 mm outside diameter, 80 mm bore and 30 mm width, envelope 80×110×30 mm. Mass is 878 g." }, { "q": "What does the NA4916-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4916-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×110×30 mm and the catalogue ratings are C 101 kN, C0 174 kN, Cur 31 kN." }, { "q": "What is the load capacity of the NA4916-XL?", "a": "The basic dynamic load rating C is 101 kN and the basic static load rating C0 is 174 kN; the fatigue load limit Cur is 31 kN." }, { "q": "What is the maximum speed of the NA4916-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 2,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4916-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 80 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4916-XL", "NA4916-XL" ], "locale_variants": {} }, { "sku": "NA6916-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6916-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 80, "D_mm": 110, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 153, "static_load_kN": 300, "fatigue_load_limit_kN": 54, "limiting_speed_rpm": 5100, "max_rpm": 5100, "reference_speed_rpm": 2900, "weight_g": 1522, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×54 mm: 80 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 153 kN and C0 300 kN at the 80 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 54 kN, the limiting speed 5,100 r/min and the thermal reference speed 2,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.91 kN/mm and per millimetre of width 2.83 kN/mm — the reason 54 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.522 kg (1522 g), just 0.26 g per mm² of projected 110×54 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 80 mm bore the 110 mm outside diameter and 54 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,100 r/min The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 300 kN C0 rating still assumes full rigid support under both rings The integral inner ring brings the bore to 80 mm inside the 110×54 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 153 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 300 kN in this thin-section bearing — two rows support the static peak that a single row could not. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 110 mm outside diameter and 153 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 80 mm seat, and in motorcycle and light-vehicle transmissions the 1.522 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 54 mm width and the published 300 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NA6916-ZW-XL?", "a": "The NA6916-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 110 mm outside diameter, 80 mm bore and 54 mm width, envelope 80×110×54 mm. Mass is 1.522 kg." }, { "q": "What does the NA6916-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6916-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×110×54 mm and the catalogue ratings are C 153 kN, C0 300 kN, Cur 54 kN." }, { "q": "What is the load capacity of the NA6916-ZW-XL?", "a": "The basic dynamic load rating C is 153 kN and the basic static load rating C0 is 300 kN; the fatigue load limit Cur is 54 kN." }, { "q": "What is the maximum speed of the NA6916-ZW-XL?", "a": "The limiting speed is 5,100 r/min and the thermal reference speed is 2,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6916-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 80 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6916", "equiv_brand": "SKF", "level": "partial", "note": "Same 80×110×54 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6916-ZW-XL", "NA6916-ZW-XL" ], "locale_variants": {} }, { "sku": "NKI85-26-XL", "brand": "FAG", "manufacturer_designation": "NKI85/26-XL", "series": "nki-series", "type": "needle", "d_mm": 85, "D_mm": 115, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 83, "static_load_kN": 137, "fatigue_load_limit_kN": 24.5, "limiting_speed_rpm": 4850, "max_rpm": 4850, "reference_speed_rpm": 3100, "weight_g": 743, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×115×26 mm: 85 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 83 kN and C0 137 kN at the 85 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 115 mm outside diameter the fatigue load limit Cur is 24.5 kN, the limiting speed 4,850 r/min and the thermal reference speed 3,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.98 kN/mm and per millimetre of width 3.19 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 743 g, just 0.25 g per mm² of projected 115×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 85 mm bore this is a heavy-industrial bearing: 743 g of stiff ring and roller set, specified where rigidity matters more than speed The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel This is the choice for OEM production on soft shafts: machine the 85 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,850 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 115 mm outside diameter and 83 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 85 mm seat, and in hydraulic and pneumatic pump eccentrics the 743 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 26 mm width and the published 137 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI85/26-XL?", "a": "The NKI85/26-XL is a NKI machined-ring needle roller bearing with inner ring with 115 mm outside diameter, 85 mm bore and 26 mm width, envelope 85×115×26 mm. Mass is 743 g." }, { "q": "What does the NKI85/26-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI85/26-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×115×26 mm and the catalogue ratings are C 83 kN, C0 137 kN, Cur 24.5 kN." }, { "q": "What is the load capacity of the NKI85/26-XL?", "a": "The basic dynamic load rating C is 83 kN and the basic static load rating C0 is 137 kN; the fatigue load limit Cur is 24.5 kN." }, { "q": "What is the maximum speed of the NKI85/26-XL?", "a": "The limiting speed is 4,850 r/min and the thermal reference speed is 3,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI85/26-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 85 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI85-26", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×115×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI85-36", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI85-26-XL", "NKI85/26-XL" ], "locale_variants": {} }, { "sku": "NKI85-36-XL", "brand": "FAG", "manufacturer_designation": "NKI85/36-XL", "series": "nki-series", "type": "needle", "d_mm": 85, "D_mm": 115, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 121, "static_load_kN": 223, "fatigue_load_limit_kN": 40.5, "limiting_speed_rpm": 4850, "max_rpm": 4850, "reference_speed_rpm": 2950, "weight_g": 1040, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×115×36 mm: 85 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 121 kN and C0 223 kN at the 85 mm seat; the C/C0 ratio of 0.54 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 115 mm outside diameter the fatigue load limit Cur is 40.5 kN, the limiting speed 4,850 r/min and the thermal reference speed 2,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.42 kN/mm and per millimetre of width 3.36 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.04 kg (1040 g), just 0.25 g per mm² of projected 115×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 85 mm bore this is a heavy-industrial bearing: 1.04 kg of stiff ring and roller set, specified where rigidity matters more than speed Cur 40.5 kN, limiting speed 4,850 r/min, reference speed 2,950 r/min — the inner ring adds a few grams (total 1040 g) but removes the hardening requirement Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 121 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 85 mm bore; the 223 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 115 mm outside diameter and 121 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 85 mm seat, and in two-stroke and compressor piston pins the 1.04 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 36 mm width and the published 223 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI85/36-XL?", "a": "The NKI85/36-XL is a NKI machined-ring needle roller bearing with inner ring with 115 mm outside diameter, 85 mm bore and 36 mm width, envelope 85×115×36 mm. Mass is 1.04 kg." }, { "q": "What does the NKI85/36-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI85/36-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×115×36 mm and the catalogue ratings are C 121 kN, C0 223 kN, Cur 40.5 kN." }, { "q": "What is the load capacity of the NKI85/36-XL?", "a": "The basic dynamic load rating C is 121 kN and the basic static load rating C0 is 223 kN; the fatigue load limit Cur is 40.5 kN." }, { "q": "What is the maximum speed of the NKI85/36-XL?", "a": "The limiting speed is 4,850 r/min and the thermal reference speed is 2,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI85/36-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 85 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI85-26", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI85-36", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×115×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI85-36-XL", "NKI85/36-XL" ], "locale_variants": {} }, { "sku": "NA4917-XL", "brand": "FAG", "manufacturer_designation": "NA4917-XL", "series": "na49-series", "type": "needle", "d_mm": 85, "D_mm": 120, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 125, "static_load_kN": 237, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 2650, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×120×35 mm: 85 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 125 kN and C0 237 kN at the 85 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 42.5 kN, the limiting speed 4,600 r/min and the thermal reference speed 2,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.47 kN/mm and per millimetre of width 3.57 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.25 kg (1250 g), just 0.30 g per mm² of projected 120×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 85 mm bore the 120 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,600 r/min The 17.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel Cur 42.5 kN, limiting speed 4,600 r/min, reference speed 2,650 r/min — the inner ring adds a few grams (total 1250 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 42.5 kN Cur value. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 120 mm outside diameter and 125 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 85 mm seat, and in two-stroke and compressor piston pins the 1.25 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 35 mm width and the published 237 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4917-XL?", "a": "The NA4917-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 120 mm outside diameter, 85 mm bore and 35 mm width, envelope 85×120×35 mm. Mass is 1.25 kg." }, { "q": "What does the NA4917-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4917-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×120×35 mm and the catalogue ratings are C 125 kN, C0 237 kN, Cur 42.5 kN." }, { "q": "What is the load capacity of the NA4917-XL?", "a": "The basic dynamic load rating C is 125 kN and the basic static load rating C0 is 237 kN; the fatigue load limit Cur is 42.5 kN." }, { "q": "What is the maximum speed of the NA4917-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 2,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4917-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 85 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4917-XL", "NA4917-XL" ], "locale_variants": {} }, { "sku": "NA6917-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6917-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 85, "D_mm": 120, "B_mm": 63, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 188, "static_load_kN": 400, "fatigue_load_limit_kN": 72, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 2700, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 85×120×63 mm: 85 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 188 kN and C0 400 kN at the 85 mm seat; the C/C0 ratio of 0.47 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 72 kN, the limiting speed 4,600 r/min and the thermal reference speed 2,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.21 kN/mm and per millimetre of width 2.98 kN/mm — the reason 63 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.2 kg (2200 g), just 0.29 g per mm² of projected 120×63 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 85 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Cur 72 kN, limiting speed 4,600 r/min, reference speed 2,700 r/min — the inner ring adds a few grams (total 2200 g) but removes the hardening requirement The 17.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 72 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 120 mm outside diameter and 188 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 85 mm seat, and in gearbox selector and change linkages the 2.2 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 63 mm width and the published 400 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA6917-ZW-XL?", "a": "The NA6917-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 120 mm outside diameter, 85 mm bore and 63 mm width, envelope 85×120×63 mm. Mass is 2.2 kg." }, { "q": "What does the NA6917-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6917-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 85×120×63 mm and the catalogue ratings are C 188 kN, C0 400 kN, Cur 72 kN." }, { "q": "What is the load capacity of the NA6917-ZW-XL?", "a": "The basic dynamic load rating C is 188 kN and the basic static load rating C0 is 400 kN; the fatigue load limit Cur is 72 kN." }, { "q": "What is the maximum speed of the NA6917-ZW-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 2,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6917-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 85 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6917", "equiv_brand": "SKF", "level": "partial", "note": "Same 85×120×63 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6917-ZW-XL", "NA6917-ZW-XL" ], "locale_variants": {} }, { "sku": "NKI90-26-XL", "brand": "FAG", "manufacturer_designation": "NKI90/26-XL", "series": "nki-series", "type": "needle", "d_mm": 90, "D_mm": 120, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 86, "static_load_kN": 146, "fatigue_load_limit_kN": 25.5, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 2950, "weight_g": 778, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×120×26 mm: 90 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 86 kN and C0 146 kN at the 90 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 25.5 kN, the limiting speed 4,600 r/min and the thermal reference speed 2,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 3.31 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 778 g, just 0.25 g per mm² of projected 120×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Cur 25.5 kN, limiting speed 4,600 r/min, reference speed 2,950 r/min — the inner ring adds a few grams (total 778 g) but removes the hardening requirement The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 146 kN C0 rating still assumes full rigid support under both rings -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 86 kN C rating and longer nominal life come without an envelope change. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 120 mm outside diameter and 86 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 90 mm seat, and in rocker arms and valve trains the 778 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 26 mm width and the published 146 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI90/26-XL?", "a": "The NKI90/26-XL is a NKI machined-ring needle roller bearing with inner ring with 120 mm outside diameter, 90 mm bore and 26 mm width, envelope 90×120×26 mm. Mass is 778 g." }, { "q": "What does the NKI90/26-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI90/26-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×120×26 mm and the catalogue ratings are C 86 kN, C0 146 kN, Cur 25.5 kN." }, { "q": "What is the load capacity of the NKI90/26-XL?", "a": "The basic dynamic load rating C is 86 kN and the basic static load rating C0 is 146 kN; the fatigue load limit Cur is 25.5 kN." }, { "q": "What is the maximum speed of the NKI90/26-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 2,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI90/26-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 90 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI90-26", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×120×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI90-36", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI90-26-XL", "NKI90/26-XL" ], "locale_variants": {} }, { "sku": "NKI90-36-XL", "brand": "FAG", "manufacturer_designation": "NKI90/36-XL", "series": "nki-series", "type": "needle", "d_mm": 90, "D_mm": 120, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 125, "static_load_kN": 237, "fatigue_load_limit_kN": 42.5, "limiting_speed_rpm": 4600, "max_rpm": 4600, "reference_speed_rpm": 2800, "weight_g": 1090, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×120×36 mm: 90 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 125 kN and C0 237 kN at the 90 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 42.5 kN, the limiting speed 4,600 r/min and the thermal reference speed 2,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.39 kN/mm and per millimetre of width 3.47 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.09 kg (1090 g), just 0.25 g per mm² of projected 120×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The 15.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel This is the choice for OEM production on soft shafts: machine the 90 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 125 kN C rating and longer nominal life come without an envelope change. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 120 mm outside diameter and 125 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 90 mm seat, and in small electric motor accessory drives the 1.09 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 36 mm width and the published 237 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NKI90/36-XL?", "a": "The NKI90/36-XL is a NKI machined-ring needle roller bearing with inner ring with 120 mm outside diameter, 90 mm bore and 36 mm width, envelope 90×120×36 mm. Mass is 1.09 kg." }, { "q": "What does the NKI90/36-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI90/36-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×120×36 mm and the catalogue ratings are C 125 kN, C0 237 kN, Cur 42.5 kN." }, { "q": "What is the load capacity of the NKI90/36-XL?", "a": "The basic dynamic load rating C is 125 kN and the basic static load rating C0 is 237 kN; the fatigue load limit Cur is 42.5 kN." }, { "q": "What is the maximum speed of the NKI90/36-XL?", "a": "The limiting speed is 4,600 r/min and the thermal reference speed is 2,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI90/36-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 90 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI90-26", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI90-36", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×120×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI90-36-XL", "NKI90/36-XL" ], "locale_variants": {} }, { "sku": "NA4918-XL", "brand": "FAG", "manufacturer_designation": "NA4918-XL", "series": "na49-series", "type": "needle", "d_mm": 90, "D_mm": 125, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 129, "static_load_kN": 250, "fatigue_load_limit_kN": 44.5, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 2500, "weight_g": 1312, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×125×35 mm: 90 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 129 kN and C0 250 kN at the 90 mm seat; the C/C0 ratio of 0.52 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 44.5 kN, the limiting speed 4,400 r/min and the thermal reference speed 2,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.43 kN/mm and per millimetre of width 3.69 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.312 kg (1312 g), just 0.30 g per mm² of projected 125×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 90 mm bore the 125 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,400 r/min Cur 44.5 kN, limiting speed 4,400 r/min, reference speed 2,500 r/min — the inner ring adds a few grams (total 1312 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 44.5 kN Cur value. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 125 mm outside diameter and 129 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 90 mm seat, and in planetary gear bearings the 1.312 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 35 mm width and the published 250 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA4918-XL?", "a": "The NA4918-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 125 mm outside diameter, 90 mm bore and 35 mm width, envelope 90×125×35 mm. Mass is 1.312 kg." }, { "q": "What does the NA4918-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4918-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×125×35 mm and the catalogue ratings are C 129 kN, C0 250 kN, Cur 44.5 kN." }, { "q": "What is the load capacity of the NA4918-XL?", "a": "The basic dynamic load rating C is 129 kN and the basic static load rating C0 is 250 kN; the fatigue load limit Cur is 44.5 kN." }, { "q": "What is the maximum speed of the NA4918-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 2,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4918-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 90 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4918-XL", "NA4918-XL" ], "locale_variants": {} }, { "sku": "NA6918-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6918-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 90, "D_mm": 125, "B_mm": 63, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 195, "static_load_kN": 425, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 2550, "weight_g": 2310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×125×63 mm: 90 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 195 kN and C0 425 kN at the 90 mm seat; the C/C0 ratio of 0.46 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 76 kN, the limiting speed 4,400 r/min and the thermal reference speed 2,550 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.17 kN/mm and per millimetre of width 3.10 kN/mm — the reason 63 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.31 kg (2310 g), just 0.29 g per mm² of projected 125×63 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery This is the choice for OEM production on soft shafts: machine the 90 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 425 kN C0 rating still assumes full rigid support under both rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 76 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 125 mm outside diameter and 195 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 90 mm seat, and in planetary gear bearings the 2.31 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 63 mm width and the published 425 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA6918-ZW-XL?", "a": "The NA6918-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 125 mm outside diameter, 90 mm bore and 63 mm width, envelope 90×125×63 mm. Mass is 2.31 kg." }, { "q": "What does the NA6918-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6918-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×125×63 mm and the catalogue ratings are C 195 kN, C0 425 kN, Cur 76 kN." }, { "q": "What is the load capacity of the NA6918-ZW-XL?", "a": "The basic dynamic load rating C is 195 kN and the basic static load rating C0 is 425 kN; the fatigue load limit Cur is 76 kN." }, { "q": "What is the maximum speed of the NA6918-ZW-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 2,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6918-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 90 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6918", "equiv_brand": "SKF", "level": "partial", "note": "Same 90×125×63 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6918-ZW-XL", "NA6918-ZW-XL" ], "locale_variants": {} }, { "sku": "NKI95-26-XL", "brand": "FAG", "manufacturer_designation": "NKI95/26-XL", "series": "nki-series", "type": "needle", "d_mm": 95, "D_mm": 125, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 89, "static_load_kN": 155, "fatigue_load_limit_kN": 27, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 2850, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×125×26 mm: 95 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 89 kN and C0 155 kN at the 95 mm seat; the C/C0 ratio of 0.57 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 27 kN, the limiting speed 4,400 r/min and the thermal reference speed 2,850 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.94 kN/mm and per millimetre of width 3.42 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 816 g, just 0.25 g per mm² of projected 125×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 95 mm bore the 125 mm outside diameter and 26 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,400 r/min This is the choice for OEM production on soft shafts: machine the 95 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway NKI95/26-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required X-life status (-XL) indicates the current Schaeffler premium execution at 95 mm bore; the 155 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 125 mm outside diameter and 89 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 95 mm seat, and in textile machine heald and cam shafts the 816 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 26 mm width and the published 155 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NKI95/26-XL?", "a": "The NKI95/26-XL is a NKI machined-ring needle roller bearing with inner ring with 125 mm outside diameter, 95 mm bore and 26 mm width, envelope 95×125×26 mm. Mass is 816 g." }, { "q": "What does the NKI95/26-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI95/26-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×125×26 mm and the catalogue ratings are C 89 kN, C0 155 kN, Cur 27 kN." }, { "q": "What is the load capacity of the NKI95/26-XL?", "a": "The basic dynamic load rating C is 89 kN and the basic static load rating C0 is 155 kN; the fatigue load limit Cur is 27 kN." }, { "q": "What is the maximum speed of the NKI95/26-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 2,850 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI95/26-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 95 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI95-26", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×125×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI95-36", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI95-26-XL", "NKI95/26-XL" ], "locale_variants": {} }, { "sku": "NKI95-36-XL", "brand": "FAG", "manufacturer_designation": "NKI95/36-XL", "series": "nki-series", "type": "needle", "d_mm": 95, "D_mm": 125, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 129, "static_load_kN": 250, "fatigue_load_limit_kN": 44.5, "limiting_speed_rpm": 4400, "max_rpm": 4400, "reference_speed_rpm": 2700, "weight_g": 1145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×125×36 mm: 95 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 129 kN and C0 250 kN at the 95 mm seat; the C/C0 ratio of 0.52 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 125 mm outside diameter the fatigue load limit Cur is 44.5 kN, the limiting speed 4,400 r/min and the thermal reference speed 2,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.36 kN/mm and per millimetre of width 3.58 kN/mm — the reason 36 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.145 kg (1145 g), just 0.25 g per mm² of projected 125×36 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 95 mm bore the 125 mm outside diameter and 36 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,400 r/min Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 129 kN C The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 250 kN C0 rating still assumes full rigid support under both rings As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 44.5 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 125 mm outside diameter and 129 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 95 mm seat, and in small electric motor accessory drives the 1.145 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 36 mm width and the published 250 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NKI95/36-XL?", "a": "The NKI95/36-XL is a NKI machined-ring needle roller bearing with inner ring with 125 mm outside diameter, 95 mm bore and 36 mm width, envelope 95×125×36 mm. Mass is 1.145 kg." }, { "q": "What does the NKI95/36-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI95/36-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×125×36 mm and the catalogue ratings are C 129 kN, C0 250 kN, Cur 44.5 kN." }, { "q": "What is the load capacity of the NKI95/36-XL?", "a": "The basic dynamic load rating C is 129 kN and the basic static load rating C0 is 250 kN; the fatigue load limit Cur is 44.5 kN." }, { "q": "What is the maximum speed of the NKI95/36-XL?", "a": "The limiting speed is 4,400 r/min and the thermal reference speed is 2,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI95/36-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 95 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI95-26", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI95-36", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×125×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI95-36-XL", "NKI95/36-XL" ], "locale_variants": {} }, { "sku": "NA4919-XL", "brand": "FAG", "manufacturer_designation": "NA4919-XL", "series": "na49-series", "type": "needle", "d_mm": 95, "D_mm": 130, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 131, "static_load_kN": 260, "fatigue_load_limit_kN": 45, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2400, "weight_g": 1371, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×130×35 mm: 95 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 131 kN and C0 260 kN at the 95 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 45 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.38 kN/mm and per millimetre of width 3.74 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.371 kg (1371 g), just 0.30 g per mm² of projected 130×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 95 mm bore the 130 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,200 r/min The integral inner ring brings the bore to 95 mm inside the 130×35 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 131 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 131 kN C rating and longer nominal life come without an envelope change. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 130 mm outside diameter and 131 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 95 mm seat, and in motorcycle and light-vehicle transmissions the 1.371 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 35 mm width and the published 260 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4919-XL?", "a": "The NA4919-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 130 mm outside diameter, 95 mm bore and 35 mm width, envelope 95×130×35 mm. Mass is 1.371 kg." }, { "q": "What does the NA4919-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4919-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×130×35 mm and the catalogue ratings are C 131 kN, C0 260 kN, Cur 45 kN." }, { "q": "What is the load capacity of the NA4919-XL?", "a": "The basic dynamic load rating C is 131 kN and the basic static load rating C0 is 260 kN; the fatigue load limit Cur is 45 kN." }, { "q": "What is the maximum speed of the NA4919-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4919-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 95 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4919-XL", "NA4919-XL" ], "locale_variants": {} }, { "sku": "NA6919-ZW-XL", "brand": "FAG", "manufacturer_designation": "NA6919-ZW-XL", "series": "na69-series", "type": "needle", "d_mm": 95, "D_mm": 130, "B_mm": 63, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 197, "static_load_kN": 440, "fatigue_load_limit_kN": 77, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2440, "weight_g": 2500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 95×130×63 mm: 95 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 197 kN and C0 440 kN at the 95 mm seat; the C/C0 ratio of 0.45 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 77 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,440 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.07 kN/mm and per millimetre of width 3.13 kN/mm — the reason 63 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.5 kg (2500 g), just 0.31 g per mm² of projected 130×63 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 95 mm bore this is a heavy-industrial bearing: 2.5 kg of stiff ring and roller set, specified where rigidity matters more than speed The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 440 kN C0 rating still assumes full rigid support under both rings Cur 77 kN, limiting speed 4,200 r/min, reference speed 2,440 r/min — the inner ring adds a few grams (total 2500 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 77 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 130 mm outside diameter and 197 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 95 mm seat, and in rocker arms and valve trains the 2.5 kg mass is part of the rotor inertia calculation. Designers also specify it for planetary gear bearings, relying on the 63 mm width and the published 440 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA6919-ZW-XL?", "a": "The NA6919-ZW-XL is a NA69 double-row dimension-series 69 needle roller bearing with inner ring with 130 mm outside diameter, 95 mm bore and 63 mm width, envelope 95×130×63 mm. Mass is 2.5 kg." }, { "q": "What does the NA6919-ZW-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA6919-ZW-XL identifies this NA69 double-row dimension-series 69 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 95×130×63 mm and the catalogue ratings are C 197 kN, C0 440 kN, Cur 77 kN." }, { "q": "What is the load capacity of the NA6919-ZW-XL?", "a": "The basic dynamic load rating C is 197 kN and the basic static load rating C0 is 440 kN; the fatigue load limit Cur is 77 kN." }, { "q": "What is the maximum speed of the NA6919-ZW-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,440 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA6919-ZW-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 95 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA6919", "equiv_brand": "SKF", "level": "partial", "note": "Same 95×130×63 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=962", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA6919-ZW-XL", "NA6919-ZW-XL" ], "locale_variants": {} }, { "sku": "NKI100-30-XL", "brand": "FAG", "manufacturer_designation": "NKI100/30-XL", "series": "nki-series", "type": "needle", "d_mm": 100, "D_mm": 130, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 111, "static_load_kN": 210, "fatigue_load_limit_kN": 36, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2650, "weight_g": 990, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×130×30 mm: 100 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 111 kN and C0 210 kN at the 100 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 36 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.11 kN/mm and per millimetre of width 3.70 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 990 g, just 0.25 g per mm² of projected 130×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 100 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery NKI100/30-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 210 kN C0 rating still assumes full rigid support under both rings -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 111 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 130 mm outside diameter and 111 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 100 mm seat, and in hydraulic and pneumatic pump eccentrics the 990 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 30 mm width and the published 210 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NKI100/30-XL?", "a": "The NKI100/30-XL is a NKI machined-ring needle roller bearing with inner ring with 130 mm outside diameter, 100 mm bore and 30 mm width, envelope 100×130×30 mm. Mass is 990 g." }, { "q": "What does the NKI100/30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI100/30-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×130×30 mm and the catalogue ratings are C 111 kN, C0 210 kN, Cur 36 kN." }, { "q": "What is the load capacity of the NKI100/30-XL?", "a": "The basic dynamic load rating C is 111 kN and the basic static load rating C0 is 210 kN; the fatigue load limit Cur is 36 kN." }, { "q": "What is the maximum speed of the NKI100/30-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI100/30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 100 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI100-30", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×130×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NKI100-40", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI100-30-XL", "NKI100/30-XL" ], "locale_variants": {} }, { "sku": "NKI100-40-XL", "brand": "FAG", "manufacturer_designation": "NKI100/40-XL", "series": "nki-series", "type": "needle", "d_mm": 100, "D_mm": 130, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 143, "static_load_kN": 290, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 4200, "max_rpm": 4200, "reference_speed_rpm": 2600, "weight_g": 1330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×130×40 mm: 100 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 143 kN and C0 290 kN at the 100 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 51 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.43 kN/mm and per millimetre of width 3.58 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.33 kg (1330 g), just 0.26 g per mm² of projected 130×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 100 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery NKI100/40-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required Reading the NKI prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 143 kN C The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 100×130×40 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 130 mm outside diameter and 143 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 100 mm seat, and in two-stroke and compressor piston pins the 1.33 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 40 mm width and the published 290 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NKI100/40-XL?", "a": "The NKI100/40-XL is a NKI machined-ring needle roller bearing with inner ring with 130 mm outside diameter, 100 mm bore and 40 mm width, envelope 100×130×40 mm. Mass is 1.33 kg." }, { "q": "What does the NKI100/40-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NKI100/40-XL identifies this NKI machined-ring needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×130×40 mm and the catalogue ratings are C 143 kN, C0 290 kN, Cur 51 kN." }, { "q": "What is the load capacity of the NKI100/40-XL?", "a": "The basic dynamic load rating C is 143 kN and the basic static load rating C0 is 290 kN; the fatigue load limit Cur is 51 kN." }, { "q": "What is the maximum speed of the NKI100/40-XL?", "a": "The limiting speed is 4,200 r/min and the thermal reference speed is 2,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NKI100/40-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 100 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NKI100-30", "equiv_brand": "SKF", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NKI100-40", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×130×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NKI100-40-XL", "NKI100/40-XL" ], "locale_variants": {} }, { "sku": "NA4920-XL", "brand": "FAG", "manufacturer_designation": "NA4920-XL", "series": "na49-series", "type": "needle", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 144, "static_load_kN": 270, "fatigue_load_limit_kN": 46, "limiting_speed_rpm": 4000, "max_rpm": 4000, "reference_speed_rpm": 2550, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×140×40 mm: 100 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 20.0 mm radial section packed with small-diameter needle rollers C is 144 kN and C0 270 kN at the 100 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 140 mm outside diameter the fatigue load limit Cur is 46 kN, the limiting speed 4,000 r/min and the thermal reference speed 2,550 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.44 kN/mm and per millimetre of width 3.60 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.9 kg (1900 g), just 0.34 g per mm² of projected 140×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 100 mm bore this is a heavy-industrial bearing: 1.9 kg of stiff ring and roller set, specified where rigidity matters more than speed The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 270 kN C0 rating still assumes full rigid support under both rings The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 4,000 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 140 mm outside diameter and 144 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 100 mm seat, and in hydraulic and pneumatic pump eccentrics the 1.9 kg mass is part of the rotor inertia calculation. Designers also specify it for textile machine heald and cam shafts, relying on the 40 mm width and the published 270 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA4920-XL?", "a": "The NA4920-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 140 mm outside diameter, 100 mm bore and 40 mm width, envelope 100×140×40 mm. Mass is 1.9 kg." }, { "q": "What does the NA4920-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4920-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×140×40 mm and the catalogue ratings are C 144 kN, C0 270 kN, Cur 46 kN." }, { "q": "What is the load capacity of the NA4920-XL?", "a": "The basic dynamic load rating C is 144 kN and the basic static load rating C0 is 270 kN; the fatigue load limit Cur is 46 kN." }, { "q": "What is the maximum speed of the NA4920-XL?", "a": "The limiting speed is 4,000 r/min and the thermal reference speed is 2,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4920-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 100 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4920", "equiv_brand": "SKF", "level": "partial", "note": "Same 100×140×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4920-XL", "NA4920-XL" ], "locale_variants": {} }, { "sku": "NA4922-XL", "brand": "FAG", "manufacturer_designation": "NA4922-XL", "series": "na49-series", "type": "needle", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 149, "static_load_kN": 290, "fatigue_load_limit_kN": 48, "limiting_speed_rpm": 3700, "max_rpm": 3700, "reference_speed_rpm": 2330, "weight_g": 2070, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×150×40 mm: 110 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 20.0 mm radial section packed with small-diameter needle rollers C is 149 kN and C0 290 kN at the 110 mm seat; the C/C0 ratio of 0.51 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 150 mm outside diameter the fatigue load limit Cur is 48 kN, the limiting speed 3,700 r/min and the thermal reference speed 2,330 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.35 kN/mm and per millimetre of width 3.73 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.07 kg (2070 g), just 0.34 g per mm² of projected 150×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 110 mm bore this is a heavy-industrial bearing: 2.07 kg of stiff ring and roller set, specified where rigidity matters more than speed The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 290 kN C0 rating still assumes full rigid support under both rings The 20.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel X-life status (-XL) indicates the current Schaeffler premium execution at 110 mm bore; the 290 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 150 mm outside diameter and 149 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 110 mm seat, and in copying and printing machine mechanisms the 2.07 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural machine pivots and linkages, relying on the 40 mm width and the published 290 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA4922-XL?", "a": "The NA4922-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 150 mm outside diameter, 110 mm bore and 40 mm width, envelope 110×150×40 mm. Mass is 2.07 kg." }, { "q": "What does the NA4922-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4922-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×150×40 mm and the catalogue ratings are C 149 kN, C0 290 kN, Cur 48 kN." }, { "q": "What is the load capacity of the NA4922-XL?", "a": "The basic dynamic load rating C is 149 kN and the basic static load rating C0 is 290 kN; the fatigue load limit Cur is 48 kN." }, { "q": "What is the maximum speed of the NA4922-XL?", "a": "The limiting speed is 3,700 r/min and the thermal reference speed is 2,330 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4922-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 110 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4922", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×150×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4922-XL", "NA4922-XL" ], "locale_variants": {} }, { "sku": "NA4822-XL", "brand": "FAG", "manufacturer_designation": "NA4822-XL", "series": "na48-series", "type": "needle", "d_mm": 110, "D_mm": 140, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 106, "static_load_kN": 216, "fatigue_load_limit_kN": 36.5, "limiting_speed_rpm": 3900, "max_rpm": 3900, "reference_speed_rpm": 2270, "weight_g": 1080, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 110×140×30 mm: 110 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 106 kN and C0 216 kN at the 110 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 140 mm outside diameter the fatigue load limit Cur is 36.5 kN, the limiting speed 3,900 r/min and the thermal reference speed 2,270 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.96 kN/mm and per millimetre of width 3.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.08 kg (1080 g), just 0.26 g per mm² of projected 140×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 110 mm bore the 140 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,900 r/min Cur 36.5 kN, limiting speed 3,900 r/min, reference speed 2,270 r/min — the inner ring adds a few grams (total 1080 g) but removes the hardening requirement Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 106 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 106 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 140 mm outside diameter and 106 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 110 mm seat, and in copying and printing machine mechanisms the 1.08 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural machine pivots and linkages, relying on the 30 mm width and the published 216 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA4822-XL?", "a": "The NA4822-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 140 mm outside diameter, 110 mm bore and 30 mm width, envelope 110×140×30 mm. Mass is 1.08 kg." }, { "q": "What does the NA4822-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4822-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 110×140×30 mm and the catalogue ratings are C 106 kN, C0 216 kN, Cur 36.5 kN." }, { "q": "What is the load capacity of the NA4822-XL?", "a": "The basic dynamic load rating C is 106 kN and the basic static load rating C0 is 216 kN; the fatigue load limit Cur is 36.5 kN." }, { "q": "What is the maximum speed of the NA4822-XL?", "a": "The limiting speed is 3,900 r/min and the thermal reference speed is 2,270 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4822-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 110 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4822", "equiv_brand": "SKF", "level": "partial", "note": "Same 110×140×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4822-XL", "NA4822-XL" ], "locale_variants": {} }, { "sku": "NA4924-XL", "brand": "FAG", "manufacturer_designation": "NA4924-XL", "series": "na49-series", "type": "needle", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 205, "static_load_kN": 390, "fatigue_load_limit_kN": 65, "limiting_speed_rpm": 3400, "max_rpm": 3400, "reference_speed_rpm": 2160, "weight_g": 2860, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×165×45 mm: 120 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 22.5 mm radial section packed with small-diameter needle rollers C is 205 kN and C0 390 kN at the 120 mm seat; the C/C0 ratio of 0.53 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 165 mm outside diameter the fatigue load limit Cur is 65 kN, the limiting speed 3,400 r/min and the thermal reference speed 2,160 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.71 kN/mm and per millimetre of width 4.56 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.86 kg (2860 g), just 0.39 g per mm² of projected 165×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 120 mm bore the 165 mm outside diameter and 45 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 3,400 r/min The 22.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel This is the choice for OEM production on soft shafts: machine the 120 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 65 kN Cur value. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 165 mm outside diameter and 205 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 120 mm seat, and in planetary gear bearings the 2.86 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 45 mm width and the published 390 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA4924-XL?", "a": "The NA4924-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 165 mm outside diameter, 120 mm bore and 45 mm width, envelope 120×165×45 mm. Mass is 2.86 kg." }, { "q": "What does the NA4924-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4924-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 120×165×45 mm and the catalogue ratings are C 205 kN, C0 390 kN, Cur 65 kN." }, { "q": "What is the load capacity of the NA4924-XL?", "a": "The basic dynamic load rating C is 205 kN and the basic static load rating C0 is 390 kN; the fatigue load limit Cur is 65 kN." }, { "q": "What is the maximum speed of the NA4924-XL?", "a": "The limiting speed is 3,400 r/min and the thermal reference speed is 2,160 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4924-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 120 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4924", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×165×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4924-XL", "NA4924-XL" ], "locale_variants": {} }, { "sku": "NA4824-XL", "brand": "FAG", "manufacturer_designation": "NA4824-XL", "series": "na48-series", "type": "needle", "d_mm": 120, "D_mm": 150, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 112, "static_load_kN": 239, "fatigue_load_limit_kN": 39.5, "limiting_speed_rpm": 3600, "max_rpm": 3600, "reference_speed_rpm": 2070, "weight_g": 1170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 120×150×30 mm: 120 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 112 kN and C0 239 kN at the 120 mm seat; the C/C0 ratio of 0.47 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 150 mm outside diameter the fatigue load limit Cur is 39.5 kN, the limiting speed 3,600 r/min and the thermal reference speed 2,070 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 3.73 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.17 kg (1170 g), just 0.26 g per mm² of projected 150×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 120 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 239 kN C0 rating still assumes full rigid support under both rings Cur 39.5 kN, limiting speed 3,600 r/min, reference speed 2,070 r/min — the inner ring adds a few grams (total 1170 g) but removes the hardening requirement The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 120×150×30 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 150 mm outside diameter and 112 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 120 mm seat, and in planetary gear bearings the 1.17 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 30 mm width and the published 239 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4824-XL?", "a": "The NA4824-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 150 mm outside diameter, 120 mm bore and 30 mm width, envelope 120×150×30 mm. Mass is 1.17 kg." }, { "q": "What does the NA4824-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4824-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 120×150×30 mm and the catalogue ratings are C 112 kN, C0 239 kN, Cur 39.5 kN." }, { "q": "What is the load capacity of the NA4824-XL?", "a": "The basic dynamic load rating C is 112 kN and the basic static load rating C0 is 239 kN; the fatigue load limit Cur is 39.5 kN." }, { "q": "What is the maximum speed of the NA4824-XL?", "a": "The limiting speed is 3,600 r/min and the thermal reference speed is 2,070 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4824-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 120 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4824", "equiv_brand": "SKF", "level": "partial", "note": "Same 120×150×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4824-XL", "NA4824-XL" ], "locale_variants": {} }, { "sku": "NA4926-XL", "brand": "FAG", "manufacturer_designation": "NA4926-XL", "series": "na49-series", "type": "needle", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 229, "static_load_kN": 470, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 3100, "max_rpm": 3100, "reference_speed_rpm": 2000, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×180×50 mm: 130 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 229 kN and C0 470 kN at the 130 mm seat; the C/C0 ratio of 0.49 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 180 mm outside diameter the fatigue load limit Cur is 76 kN, the limiting speed 3,100 r/min and the thermal reference speed 2,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.76 kN/mm and per millimetre of width 4.58 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.9 kg (3900 g), just 0.43 g per mm² of projected 180×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 130 mm bore this is among the largest catalogue sizes; the 3,100 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The integral inner ring brings the bore to 130 mm inside the 180×50 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Cur 76 kN, limiting speed 3,100 r/min, reference speed 2,000 r/min — the inner ring adds a few grams (total 3900 g) but removes the hardening requirement As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 76 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 180 mm outside diameter and 229 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 130 mm seat, and in connecting-rod small ends the 3.9 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 50 mm width and the published 470 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4926-XL?", "a": "The NA4926-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 180 mm outside diameter, 130 mm bore and 50 mm width, envelope 130×180×50 mm. Mass is 3.9 kg." }, { "q": "What does the NA4926-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4926-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 130×180×50 mm and the catalogue ratings are C 229 kN, C0 470 kN, Cur 76 kN." }, { "q": "What is the load capacity of the NA4926-XL?", "a": "The basic dynamic load rating C is 229 kN and the basic static load rating C0 is 470 kN; the fatigue load limit Cur is 76 kN." }, { "q": "What is the maximum speed of the NA4926-XL?", "a": "The limiting speed is 3,100 r/min and the thermal reference speed is 2,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4926-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 130 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4926", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×180×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4926-XL", "NA4926-XL" ], "locale_variants": {} }, { "sku": "NA4826-XL", "brand": "FAG", "manufacturer_designation": "NA4826-XL", "series": "na48-series", "type": "needle", "d_mm": 130, "D_mm": 165, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 134, "static_load_kN": 310, "fatigue_load_limit_kN": 49.5, "limiting_speed_rpm": 3250, "max_rpm": 3250, "reference_speed_rpm": 1930, "weight_g": 1810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 130×165×35 mm: 130 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 134 kN and C0 310 kN at the 130 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 165 mm outside diameter the fatigue load limit Cur is 49.5 kN, the limiting speed 3,250 r/min and the thermal reference speed 1,930 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 3.83 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.81 kg (1810 g), just 0.31 g per mm² of projected 165×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 130 mm bore puts this execution at the top of the HR1 range — the 165 mm outside diameter, 35 mm width and 1.81 kg mass are built for primary-industry load cases The 17.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel Cur 49.5 kN, limiting speed 3,250 r/min, reference speed 1,930 r/min — the inner ring adds a few grams (total 1810 g) but removes the hardening requirement The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 130×165×35 mm envelope. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 165 mm outside diameter and 134 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 130 mm seat, and in connecting-rod small ends the 1.81 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 35 mm width and the published 310 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4826-XL?", "a": "The NA4826-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 165 mm outside diameter, 130 mm bore and 35 mm width, envelope 130×165×35 mm. Mass is 1.81 kg." }, { "q": "What does the NA4826-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4826-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 130×165×35 mm and the catalogue ratings are C 134 kN, C0 310 kN, Cur 49.5 kN." }, { "q": "What is the load capacity of the NA4826-XL?", "a": "The basic dynamic load rating C is 134 kN and the basic static load rating C0 is 310 kN; the fatigue load limit Cur is 49.5 kN." }, { "q": "What is the maximum speed of the NA4826-XL?", "a": "The limiting speed is 3,250 r/min and the thermal reference speed is 1,930 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4826-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 130 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4826", "equiv_brand": "SKF", "level": "partial", "note": "Same 130×165×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4826-XL", "NA4826-XL" ], "locale_variants": {} }, { "sku": "NA4928-XL", "brand": "FAG", "manufacturer_designation": "NA4928-XL", "series": "na49-series", "type": "needle", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 237, "static_load_kN": 500, "fatigue_load_limit_kN": 79, "limiting_speed_rpm": 2900, "max_rpm": 2900, "reference_speed_rpm": 1860, "weight_g": 4150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×190×50 mm: 140 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 237 kN and C0 500 kN at the 140 mm seat; the C/C0 ratio of 0.47 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 190 mm outside diameter the fatigue load limit Cur is 79 kN, the limiting speed 2,900 r/min and the thermal reference speed 1,860 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.69 kN/mm and per millimetre of width 4.74 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 4.15 kg (4150 g), just 0.44 g per mm² of projected 190×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 140 mm bore this is among the largest catalogue sizes; the 2,900 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 500 kN C0 rating still assumes full rigid support under both rings Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 237 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 237 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 190 mm outside diameter and 237 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 140 mm seat, and in textile machine heald and cam shafts the 4.15 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 50 mm width and the published 500 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA4928-XL?", "a": "The NA4928-XL is a NA49 dimension-series 49 needle roller bearing with inner ring with 190 mm outside diameter, 140 mm bore and 50 mm width, envelope 140×190×50 mm. Mass is 4.15 kg." }, { "q": "What does the NA4928-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4928-XL identifies this NA49 dimension-series 49 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 140×190×50 mm and the catalogue ratings are C 237 kN, C0 500 kN, Cur 79 kN." }, { "q": "What is the load capacity of the NA4928-XL?", "a": "The basic dynamic load rating C is 237 kN and the basic static load rating C0 is 500 kN; the fatigue load limit Cur is 79 kN." }, { "q": "What is the maximum speed of the NA4928-XL?", "a": "The limiting speed is 2,900 r/min and the thermal reference speed is 1,860 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4928-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 140 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4928", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×190×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4928-XL", "NA4928-XL" ], "locale_variants": {} }, { "sku": "NA4828-XL", "brand": "FAG", "manufacturer_designation": "NA4828-XL", "series": "na48-series", "type": "needle", "d_mm": 140, "D_mm": 175, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 136, "static_load_kN": 325, "fatigue_load_limit_kN": 51, "limiting_speed_rpm": 3050, "max_rpm": 3050, "reference_speed_rpm": 1810, "weight_g": 1920, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 140×175×35 mm: 140 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 136 kN and C0 325 kN at the 140 mm seat; the C/C0 ratio of 0.42 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 175 mm outside diameter the fatigue load limit Cur is 51 kN, the limiting speed 3,050 r/min and the thermal reference speed 1,810 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.97 kN/mm and per millimetre of width 3.89 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.92 kg (1920 g), just 0.31 g per mm² of projected 175×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 140 mm bore puts this execution at the top of the HR1 range — the 175 mm outside diameter, 35 mm width and 1.92 kg mass are built for primary-industry load cases The integral inner ring brings the bore to 140 mm inside the 175×35 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 136 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,050 r/min limit. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 175 mm outside diameter and 136 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 140 mm seat, and in textile machine heald and cam shafts the 1.92 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 35 mm width and the published 325 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4828-XL?", "a": "The NA4828-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 175 mm outside diameter, 140 mm bore and 35 mm width, envelope 140×175×35 mm. Mass is 1.92 kg." }, { "q": "What does the NA4828-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4828-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 140×175×35 mm and the catalogue ratings are C 136 kN, C0 325 kN, Cur 51 kN." }, { "q": "What is the load capacity of the NA4828-XL?", "a": "The basic dynamic load rating C is 136 kN and the basic static load rating C0 is 325 kN; the fatigue load limit Cur is 51 kN." }, { "q": "What is the maximum speed of the NA4828-XL?", "a": "The limiting speed is 3,050 r/min and the thermal reference speed is 1,810 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4828-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 140 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4828", "equiv_brand": "SKF", "level": "partial", "note": "Same 140×175×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4828-XL", "NA4828-XL" ], "locale_variants": {} }, { "sku": "NA4830-XL", "brand": "FAG", "manufacturer_designation": "NA4830-XL", "series": "na48-series", "type": "needle", "d_mm": 150, "D_mm": 190, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 172, "static_load_kN": 400, "fatigue_load_limit_kN": 63, "limiting_speed_rpm": 2850, "max_rpm": 2850, "reference_speed_rpm": 1780, "weight_g": 2720, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 150×190×40 mm: 150 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 20.0 mm radial section packed with small-diameter needle rollers C is 172 kN and C0 400 kN at the 150 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 190 mm outside diameter the fatigue load limit Cur is 63 kN, the limiting speed 2,850 r/min and the thermal reference speed 1,780 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.15 kN/mm and per millimetre of width 4.30 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.72 kg (2720 g), just 0.36 g per mm² of projected 190×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 150 mm bore this is among the largest catalogue sizes; the 2,850 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The integral inner ring brings the bore to 150 mm inside the 190×40 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 172 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 172 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 190 mm outside diameter and 172 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 150 mm seat, and in two-stroke and compressor piston pins the 2.72 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 40 mm width and the published 400 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4830-XL?", "a": "The NA4830-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 190 mm outside diameter, 150 mm bore and 40 mm width, envelope 150×190×40 mm. Mass is 2.72 kg." }, { "q": "What does the NA4830-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4830-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 150×190×40 mm and the catalogue ratings are C 172 kN, C0 400 kN, Cur 63 kN." }, { "q": "What is the load capacity of the NA4830-XL?", "a": "The basic dynamic load rating C is 172 kN and the basic static load rating C0 is 400 kN; the fatigue load limit Cur is 63 kN." }, { "q": "What is the maximum speed of the NA4830-XL?", "a": "The limiting speed is 2,850 r/min and the thermal reference speed is 1,780 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4830-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 150 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4830", "equiv_brand": "SKF", "level": "partial", "note": "Same 150×190×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4830-XL", "NA4830-XL" ], "locale_variants": {} }, { "sku": "NA4832-XL", "brand": "FAG", "manufacturer_designation": "NA4832-XL", "series": "na48-series", "type": "needle", "d_mm": 160, "D_mm": 200, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 181, "static_load_kN": 435, "fatigue_load_limit_kN": 67, "limiting_speed_rpm": 2700, "max_rpm": 2700, "reference_speed_rpm": 1650, "weight_g": 2890, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 160×200×40 mm: 160 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 20.0 mm radial section packed with small-diameter needle rollers C is 181 kN and C0 435 kN at the 160 mm seat; the C/C0 ratio of 0.42 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 200 mm outside diameter the fatigue load limit Cur is 67 kN, the limiting speed 2,700 r/min and the thermal reference speed 1,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.13 kN/mm and per millimetre of width 4.53 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 2.89 kg (2890 g), just 0.36 g per mm² of projected 200×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 160 mm bore this is among the largest catalogue sizes; the 2,700 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The integral inner ring brings the bore to 160 mm inside the 200×40 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing This is the choice for OEM production on soft shafts: machine the 160 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 160×200×40 mm envelope. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 200 mm outside diameter and 181 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 160 mm seat, and in motorcycle and light-vehicle transmissions the 2.89 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 40 mm width and the published 435 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4832-XL?", "a": "The NA4832-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 200 mm outside diameter, 160 mm bore and 40 mm width, envelope 160×200×40 mm. Mass is 2.89 kg." }, { "q": "What does the NA4832-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4832-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 160×200×40 mm and the catalogue ratings are C 181 kN, C0 435 kN, Cur 67 kN." }, { "q": "What is the load capacity of the NA4832-XL?", "a": "The basic dynamic load rating C is 181 kN and the basic static load rating C0 is 435 kN; the fatigue load limit Cur is 67 kN." }, { "q": "What is the maximum speed of the NA4832-XL?", "a": "The limiting speed is 2,700 r/min and the thermal reference speed is 1,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4832-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 160 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4832", "equiv_brand": "SKF", "level": "partial", "note": "Same 160×200×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4832-XL", "NA4832-XL" ], "locale_variants": {} }, { "sku": "NA4834-XL", "brand": "FAG", "manufacturer_designation": "NA4834-XL", "series": "na48-series", "type": "needle", "d_mm": 170, "D_mm": 215, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 209, "static_load_kN": 510, "fatigue_load_limit_kN": 76, "limiting_speed_rpm": 2550, "max_rpm": 2550, "reference_speed_rpm": 1610, "weight_g": 3960, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 170×215×45 mm: 170 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 22.5 mm radial section packed with small-diameter needle rollers C is 209 kN and C0 510 kN at the 170 mm seat; the C/C0 ratio of 0.41 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 215 mm outside diameter the fatigue load limit Cur is 76 kN, the limiting speed 2,550 r/min and the thermal reference speed 1,610 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.23 kN/mm and per millimetre of width 4.64 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3.96 kg (3960 g), just 0.41 g per mm² of projected 215×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 170 mm bore puts this execution at the top of the HR1 range — the 215 mm outside diameter, 45 mm width and 3.96 kg mass are built for primary-industry load cases This is the choice for OEM production on soft shafts: machine the 170 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway The 22.5 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 170×215×45 mm envelope. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 215 mm outside diameter and 209 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 170 mm seat, and in gearbox selector and change linkages the 3.96 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 45 mm width and the published 510 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4834-XL?", "a": "The NA4834-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 215 mm outside diameter, 170 mm bore and 45 mm width, envelope 170×215×45 mm. Mass is 3.96 kg." }, { "q": "What does the NA4834-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4834-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 170×215×45 mm and the catalogue ratings are C 209 kN, C0 510 kN, Cur 76 kN." }, { "q": "What is the load capacity of the NA4834-XL?", "a": "The basic dynamic load rating C is 209 kN and the basic static load rating C0 is 510 kN; the fatigue load limit Cur is 76 kN." }, { "q": "What is the maximum speed of the NA4834-XL?", "a": "The limiting speed is 2,550 r/min and the thermal reference speed is 1,610 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4834-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 170 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4834", "equiv_brand": "SKF", "level": "partial", "note": "Same 170×215×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4834-XL", "NA4834-XL" ], "locale_variants": {} }, { "sku": "NA4836-XL", "brand": "FAG", "manufacturer_designation": "NA4836-XL", "series": "na48-series", "type": "needle", "d_mm": 180, "D_mm": 225, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 219, "static_load_kN": 550, "fatigue_load_limit_kN": 81, "limiting_speed_rpm": 2420, "max_rpm": 2420, "reference_speed_rpm": 1490, "weight_g": 4200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 180×225×45 mm: 180 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 22.5 mm radial section packed with small-diameter needle rollers C is 219 kN and C0 550 kN at the 180 mm seat; the C/C0 ratio of 0.40 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 225 mm outside diameter the fatigue load limit Cur is 81 kN, the limiting speed 2,420 r/min and the thermal reference speed 1,490 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.22 kN/mm and per millimetre of width 4.87 kN/mm — the reason 45 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 4.2 kg (4200 g), just 0.41 g per mm² of projected 225×45 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 180 mm bore puts this execution at the top of the HR1 range — the 225 mm outside diameter, 45 mm width and 4.2 kg mass are built for primary-industry load cases Cur 81 kN, limiting speed 2,420 r/min, reference speed 1,490 r/min — the inner ring adds a few grams (total 4200 g) but removes the hardening requirement The integral inner ring brings the bore to 180 mm inside the 225×45 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 2,420 r/min limit. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 225 mm outside diameter and 219 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 180 mm seat, and in planetary gear bearings the 4.2 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 45 mm width and the published 550 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NA4836-XL?", "a": "The NA4836-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 225 mm outside diameter, 180 mm bore and 45 mm width, envelope 180×225×45 mm. Mass is 4.2 kg." }, { "q": "What does the NA4836-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4836-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 180×225×45 mm and the catalogue ratings are C 219 kN, C0 550 kN, Cur 81 kN." }, { "q": "What is the load capacity of the NA4836-XL?", "a": "The basic dynamic load rating C is 219 kN and the basic static load rating C0 is 550 kN; the fatigue load limit Cur is 81 kN." }, { "q": "What is the maximum speed of the NA4836-XL?", "a": "The limiting speed is 2,420 r/min and the thermal reference speed is 1,490 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4836-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 180 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4836", "equiv_brand": "SKF", "level": "partial", "note": "Same 180×225×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4836-XL", "NA4836-XL" ], "locale_variants": {} }, { "sku": "NA4838-XL", "brand": "FAG", "manufacturer_designation": "NA4838-XL", "series": "na48-series", "type": "needle", "d_mm": 190, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 255, "static_load_kN": 690, "fatigue_load_limit_kN": 102, "limiting_speed_rpm": 2250, "max_rpm": 2250, "reference_speed_rpm": 1330, "weight_g": 5610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 190×240×50 mm: 190 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 255 kN and C0 690 kN at the 190 mm seat; the C/C0 ratio of 0.37 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 240 mm outside diameter the fatigue load limit Cur is 102 kN, the limiting speed 2,250 r/min and the thermal reference speed 1,330 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.34 kN/mm and per millimetre of width 5.10 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.61 kg (5610 g), just 0.47 g per mm² of projected 240×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 190 mm bore puts this execution at the top of the HR1 range — the 240 mm outside diameter, 50 mm width and 5.61 kg mass are built for primary-industry load cases This is the choice for OEM production on soft shafts: machine the 190 mm seat to the recommended tolerance, fit the bearing, and let the inner ring provide the precision raceway X-life status (-XL) indicates the current Schaeffler premium execution at 190 mm bore; the 690 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 240 mm outside diameter and 255 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 190 mm seat, and in small electric motor accessory drives the 5.61 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 50 mm width and the published 690 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NA4838-XL?", "a": "The NA4838-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 240 mm outside diameter, 190 mm bore and 50 mm width, envelope 190×240×50 mm. Mass is 5.61 kg." }, { "q": "What does the NA4838-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4838-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 190×240×50 mm and the catalogue ratings are C 255 kN, C0 690 kN, Cur 102 kN." }, { "q": "What is the load capacity of the NA4838-XL?", "a": "The basic dynamic load rating C is 255 kN and the basic static load rating C0 is 690 kN; the fatigue load limit Cur is 102 kN." }, { "q": "What is the maximum speed of the NA4838-XL?", "a": "The limiting speed is 2,250 r/min and the thermal reference speed is 1,330 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4838-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 190 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4838", "equiv_brand": "SKF", "level": "partial", "note": "Same 190×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4838-XL", "NA4838-XL" ], "locale_variants": {} }, { "sku": "NA4840-XL", "brand": "FAG", "manufacturer_designation": "NA4840-XL", "series": "na48-series", "type": "needle", "d_mm": 200, "D_mm": 250, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 260, "static_load_kN": 720, "fatigue_load_limit_kN": 104, "limiting_speed_rpm": 2150, "max_rpm": 2150, "reference_speed_rpm": 1250, "weight_g": 5840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 200×250×50 mm: 200 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 260 kN and C0 720 kN at the 200 mm seat; the C/C0 ratio of 0.36 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 250 mm outside diameter the fatigue load limit Cur is 104 kN, the limiting speed 2,150 r/min and the thermal reference speed 1,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.30 kN/mm and per millimetre of width 5.20 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 5.84 kg (5840 g), just 0.47 g per mm² of projected 250×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 200 mm bore this is among the largest catalogue sizes; the 2,150 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 720 kN C0 rating still assumes full rigid support under both rings The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 200×250×50 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 250 mm outside diameter and 260 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 200 mm seat, and in copying and printing machine mechanisms the 5.84 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural machine pivots and linkages, relying on the 50 mm width and the published 720 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA4840-XL?", "a": "The NA4840-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 250 mm outside diameter, 200 mm bore and 50 mm width, envelope 200×250×50 mm. Mass is 5.84 kg." }, { "q": "What does the NA4840-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4840-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 200×250×50 mm and the catalogue ratings are C 260 kN, C0 720 kN, Cur 104 kN." }, { "q": "What is the load capacity of the NA4840-XL?", "a": "The basic dynamic load rating C is 260 kN and the basic static load rating C0 is 720 kN; the fatigue load limit Cur is 104 kN." }, { "q": "What is the maximum speed of the NA4840-XL?", "a": "The limiting speed is 2,150 r/min and the thermal reference speed is 1,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4840-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 200 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4840", "equiv_brand": "SKF", "level": "partial", "note": "Same 200×250×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4840-XL", "NA4840-XL" ], "locale_variants": {} }, { "sku": "NA4844-XL", "brand": "FAG", "manufacturer_designation": "NA4844-XL", "series": "na48-series", "type": "needle", "d_mm": 220, "D_mm": 270, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 275, "static_load_kN": 790, "fatigue_load_limit_kN": 112, "limiting_speed_rpm": 1980, "max_rpm": 1980, "reference_speed_rpm": 1110, "weight_g": 6380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 220×270×50 mm: 220 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 25.0 mm radial section packed with small-diameter needle rollers C is 275 kN and C0 790 kN at the 220 mm seat; the C/C0 ratio of 0.35 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 270 mm outside diameter the fatigue load limit Cur is 112 kN, the limiting speed 1,980 r/min and the thermal reference speed 1,110 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.25 kN/mm and per millimetre of width 5.50 kN/mm — the reason 50 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 6.38 kg (6380 g), just 0.47 g per mm² of projected 270×50 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 220 mm bore this is among the largest catalogue sizes; the 1,980 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Cur 112 kN, limiting speed 1,980 r/min, reference speed 1,110 r/min — the inner ring adds a few grams (total 6380 g) but removes the hardening requirement The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 1,980 r/min limit. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 270 mm outside diameter and 275 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 220 mm seat, and in motorcycle and light-vehicle transmissions the 6.38 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 50 mm width and the published 790 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA4844-XL?", "a": "The NA4844-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 270 mm outside diameter, 220 mm bore and 50 mm width, envelope 220×270×50 mm. Mass is 6.38 kg." }, { "q": "What does the NA4844-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4844-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 220×270×50 mm and the catalogue ratings are C 275 kN, C0 790 kN, Cur 112 kN." }, { "q": "What is the load capacity of the NA4844-XL?", "a": "The basic dynamic load rating C is 275 kN and the basic static load rating C0 is 790 kN; the fatigue load limit Cur is 112 kN." }, { "q": "What is the maximum speed of the NA4844-XL?", "a": "The limiting speed is 1,980 r/min and the thermal reference speed is 1,110 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4844-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 220 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4844", "equiv_brand": "SKF", "level": "partial", "note": "Same 220×270×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4844-XL", "NA4844-XL" ], "locale_variants": {} }, { "sku": "NA4848-XL", "brand": "FAG", "manufacturer_designation": "NA4848-XL", "series": "na48-series", "type": "needle", "d_mm": 240, "D_mm": 300, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 400, "static_load_kN": 1080, "fatigue_load_limit_kN": 153, "limiting_speed_rpm": 1780, "max_rpm": 1780, "reference_speed_rpm": 960, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 240×300×60 mm: 240 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 30.0 mm radial section packed with small-diameter needle rollers C is 400 kN and C0 1080 kN at the 240 mm seat; the C/C0 ratio of 0.37 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 300 mm outside diameter the fatigue load limit Cur is 153 kN, the limiting speed 1,780 r/min and the thermal reference speed 960 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.67 kN/mm and per millimetre of width 6.67 kN/mm — the reason 60 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 10 kg (10000 g), just 0.56 g per mm² of projected 300×60 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 240 mm bore puts this execution at the top of the HR1 range — the 300 mm outside diameter, 60 mm width and 10 kg mass are built for primary-industry load cases Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 400 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 240 mm bore; the 1080 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 300 mm outside diameter and 400 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 240 mm seat, and in planetary gear bearings the 10 kg mass is part of the rotor inertia calculation. Designers also specify it for copying and printing machine mechanisms, relying on the 60 mm width and the published 1080 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA4848-XL?", "a": "The NA4848-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 300 mm outside diameter, 240 mm bore and 60 mm width, envelope 240×300×60 mm. Mass is 10 kg." }, { "q": "What does the NA4848-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4848-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 240×300×60 mm and the catalogue ratings are C 400 kN, C0 1080 kN, Cur 153 kN." }, { "q": "What is the load capacity of the NA4848-XL?", "a": "The basic dynamic load rating C is 400 kN and the basic static load rating C0 is 1080 kN; the fatigue load limit Cur is 153 kN." }, { "q": "What is the maximum speed of the NA4848-XL?", "a": "The limiting speed is 1,780 r/min and the thermal reference speed is 960 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4848-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 240 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4848", "equiv_brand": "SKF", "level": "partial", "note": "Same 240×300×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4848-XL", "NA4848-XL" ], "locale_variants": {} }, { "sku": "NA4852-XL", "brand": "FAG", "manufacturer_designation": "NA4852-XL", "series": "na48-series", "type": "needle", "d_mm": 260, "D_mm": 320, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 415, "static_load_kN": 1160, "fatigue_load_limit_kN": 161, "limiting_speed_rpm": 1660, "max_rpm": 1660, "reference_speed_rpm": 870, "weight_g": 10600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 260×320×60 mm: 260 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 30.0 mm radial section packed with small-diameter needle rollers C is 415 kN and C0 1160 kN at the 260 mm seat; the C/C0 ratio of 0.36 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 320 mm outside diameter the fatigue load limit Cur is 161 kN, the limiting speed 1,660 r/min and the thermal reference speed 870 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.60 kN/mm and per millimetre of width 6.92 kN/mm — the reason 60 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 10.6 kg (10600 g), just 0.55 g per mm² of projected 320×60 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 260 mm bore this is among the largest catalogue sizes; the 1,660 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position Cur 161 kN, limiting speed 1,660 r/min, reference speed 870 r/min — the inner ring adds a few grams (total 10600 g) but removes the hardening requirement NA4852-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 1,660 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 320 mm outside diameter and 415 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 260 mm seat, and in copying and printing machine mechanisms the 10.6 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural machine pivots and linkages, relying on the 60 mm width and the published 1160 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NA4852-XL?", "a": "The NA4852-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 320 mm outside diameter, 260 mm bore and 60 mm width, envelope 260×320×60 mm. Mass is 10.6 kg." }, { "q": "What does the NA4852-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4852-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 260×320×60 mm and the catalogue ratings are C 415 kN, C0 1160 kN, Cur 161 kN." }, { "q": "What is the load capacity of the NA4852-XL?", "a": "The basic dynamic load rating C is 415 kN and the basic static load rating C0 is 1160 kN; the fatigue load limit Cur is 161 kN." }, { "q": "What is the maximum speed of the NA4852-XL?", "a": "The limiting speed is 1,660 r/min and the thermal reference speed is 870 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4852-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 260 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4852", "equiv_brand": "SKF", "level": "partial", "note": "Same 260×320×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4852-XL", "NA4852-XL" ], "locale_variants": {} }, { "sku": "NA4856-XL", "brand": "FAG", "manufacturer_designation": "NA4856-XL", "series": "na48-series", "type": "needle", "d_mm": 280, "D_mm": 350, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 510, "static_load_kN": 1300, "fatigue_load_limit_kN": 178, "limiting_speed_rpm": 1540, "max_rpm": 1540, "reference_speed_rpm": 840, "weight_g": 15300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 280×350×69 mm: 280 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 35.0 mm radial section packed with small-diameter needle rollers C is 510 kN and C0 1300 kN at the 280 mm seat; the C/C0 ratio of 0.39 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 350 mm outside diameter the fatigue load limit Cur is 178 kN, the limiting speed 1,540 r/min and the thermal reference speed 840 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.82 kN/mm and per millimetre of width 7.39 kN/mm — the reason 69 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 15.3 kg (15300 g), just 0.63 g per mm² of projected 350×69 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 280 mm bore puts this execution at the top of the HR1 range — the 350 mm outside diameter, 69 mm width and 15.3 kg mass are built for primary-industry load cases The 35.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 510 kN C X-life status (-XL) indicates the current Schaeffler premium execution at 280 mm bore; the 1300 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 350 mm outside diameter and 510 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 280 mm seat, and in connecting-rod small ends the 15.3 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 69 mm width and the published 1300 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NA4856-XL?", "a": "The NA4856-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 350 mm outside diameter, 280 mm bore and 69 mm width, envelope 280×350×69 mm. Mass is 15.3 kg." }, { "q": "What does the NA4856-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4856-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 280×350×69 mm and the catalogue ratings are C 510 kN, C0 1300 kN, Cur 178 kN." }, { "q": "What is the load capacity of the NA4856-XL?", "a": "The basic dynamic load rating C is 510 kN and the basic static load rating C0 is 1300 kN; the fatigue load limit Cur is 178 kN." }, { "q": "What is the maximum speed of the NA4856-XL?", "a": "The limiting speed is 1,540 r/min and the thermal reference speed is 840 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4856-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 280 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4856", "equiv_brand": "SKF", "level": "partial", "note": "Same 280×350×69 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4856-XL", "NA4856-XL" ], "locale_variants": {} }, { "sku": "NA4860-XL", "brand": "FAG", "manufacturer_designation": "NA4860-XL", "series": "na48-series", "type": "needle", "d_mm": 300, "D_mm": 380, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 700, "static_load_kN": 1770, "fatigue_load_limit_kN": 239, "limiting_speed_rpm": 1420, "max_rpm": 1420, "reference_speed_rpm": 720, "weight_g": 21800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 300×380×80 mm: 300 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 40.0 mm radial section packed with small-diameter needle rollers C is 700 kN and C0 1770 kN at the 300 mm seat; the C/C0 ratio of 0.40 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 380 mm outside diameter the fatigue load limit Cur is 239 kN, the limiting speed 1,420 r/min and the thermal reference speed 720 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.33 kN/mm and per millimetre of width 8.75 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 21.8 kg (21800 g), just 0.72 g per mm² of projected 380×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 300 mm bore this is among the largest catalogue sizes; the 1,420 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 1770 kN C0 rating still assumes full rigid support under both rings Reading the NA48 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 700 kN C The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 1,420 r/min limit. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 380 mm outside diameter and 700 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 300 mm seat, and in two-stroke and compressor piston pins the 21.8 kg mass is part of the rotor inertia calculation. Designers also specify it for small electric motor accessory drives, relying on the 80 mm width and the published 1770 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NA4860-XL?", "a": "The NA4860-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 380 mm outside diameter, 300 mm bore and 80 mm width, envelope 300×380×80 mm. Mass is 21.8 kg." }, { "q": "What does the NA4860-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4860-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 300×380×80 mm and the catalogue ratings are C 700 kN, C0 1770 kN, Cur 239 kN." }, { "q": "What is the load capacity of the NA4860-XL?", "a": "The basic dynamic load rating C is 700 kN and the basic static load rating C0 is 1770 kN; the fatigue load limit Cur is 239 kN." }, { "q": "What is the maximum speed of the NA4860-XL?", "a": "The limiting speed is 1,420 r/min and the thermal reference speed is 720 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4860-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 300 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4860", "equiv_brand": "SKF", "level": "partial", "note": "Same 300×380×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4860-XL", "NA4860-XL" ], "locale_variants": {} }, { "sku": "NA4864-XL", "brand": "FAG", "manufacturer_designation": "NA4864-XL", "series": "na48-series", "type": "needle", "d_mm": 320, "D_mm": 400, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 710, "static_load_kN": 1850, "fatigue_load_limit_kN": 246, "limiting_speed_rpm": 1340, "max_rpm": 1340, "reference_speed_rpm": 670, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 320×400×80 mm: 320 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 40.0 mm radial section packed with small-diameter needle rollers C is 710 kN and C0 1850 kN at the 320 mm seat; the C/C0 ratio of 0.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 400 mm outside diameter the fatigue load limit Cur is 246 kN, the limiting speed 1,340 r/min and the thermal reference speed 670 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.22 kN/mm and per millimetre of width 8.88 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 23 kg (23000 g), just 0.72 g per mm² of projected 400×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 320 mm bore this is among the largest catalogue sizes; the 1,340 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 1850 kN C0 rating still assumes full rigid support under both rings The integral inner ring brings the bore to 320 mm inside the 400×80 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 246 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 400 mm outside diameter and 710 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 320 mm seat, and in connecting-rod small ends the 23 kg mass is part of the rotor inertia calculation. Designers also specify it for two-stroke and compressor piston pins, relying on the 80 mm width and the published 1850 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NA4864-XL?", "a": "The NA4864-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 400 mm outside diameter, 320 mm bore and 80 mm width, envelope 320×400×80 mm. Mass is 23 kg." }, { "q": "What does the NA4864-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4864-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 320×400×80 mm and the catalogue ratings are C 710 kN, C0 1850 kN, Cur 246 kN." }, { "q": "What is the load capacity of the NA4864-XL?", "a": "The basic dynamic load rating C is 710 kN and the basic static load rating C0 is 1850 kN; the fatigue load limit Cur is 246 kN." }, { "q": "What is the maximum speed of the NA4864-XL?", "a": "The limiting speed is 1,340 r/min and the thermal reference speed is 670 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4864-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 320 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4864", "equiv_brand": "SKF", "level": "partial", "note": "Same 320×400×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4864-XL", "NA4864-XL" ], "locale_variants": {} }, { "sku": "NA4868-XL", "brand": "FAG", "manufacturer_designation": "NA4868-XL", "series": "na48-series", "type": "needle", "d_mm": 340, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 730, "static_load_kN": 1940, "fatigue_load_limit_kN": 255, "limiting_speed_rpm": 1270, "max_rpm": 1270, "reference_speed_rpm": 620, "weight_g": 24200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 340×420×80 mm: 340 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 40.0 mm radial section packed with small-diameter needle rollers C is 730 kN and C0 1940 kN at the 340 mm seat; the C/C0 ratio of 0.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 420 mm outside diameter the fatigue load limit Cur is 255 kN, the limiting speed 1,270 r/min and the thermal reference speed 620 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.15 kN/mm and per millimetre of width 9.13 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 24.2 kg (24200 g), just 0.72 g per mm² of projected 420×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 340 mm bore puts this execution at the top of the HR1 range — the 420 mm outside diameter, 80 mm width and 24.2 kg mass are built for primary-industry load cases The integral inner ring brings the bore to 340 mm inside the 420×80 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing The 40.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 730 kN C rating and longer nominal life come without an envelope change. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 420 mm outside diameter and 730 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 340 mm seat, and in small electric motor accessory drives the 24.2 kg mass is part of the rotor inertia calculation. Designers also specify it for gearbox selector and change linkages, relying on the 80 mm width and the published 1940 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NA4868-XL?", "a": "The NA4868-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 420 mm outside diameter, 340 mm bore and 80 mm width, envelope 340×420×80 mm. Mass is 24.2 kg." }, { "q": "What does the NA4868-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4868-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 340×420×80 mm and the catalogue ratings are C 730 kN, C0 1940 kN, Cur 255 kN." }, { "q": "What is the load capacity of the NA4868-XL?", "a": "The basic dynamic load rating C is 730 kN and the basic static load rating C0 is 1940 kN; the fatigue load limit Cur is 255 kN." }, { "q": "What is the maximum speed of the NA4868-XL?", "a": "The limiting speed is 1,270 r/min and the thermal reference speed is 620 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4868-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 340 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4868", "equiv_brand": "SKF", "level": "partial", "note": "Same 340×420×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4868-XL", "NA4868-XL" ], "locale_variants": {} }, { "sku": "NA4872-XL", "brand": "FAG", "manufacturer_designation": "NA4872-XL", "series": "na48-series", "type": "needle", "d_mm": 360, "D_mm": 440, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 740, "static_load_kN": 2020, "fatigue_load_limit_kN": 260, "limiting_speed_rpm": 1210, "max_rpm": 1210, "reference_speed_rpm": 590, "weight_g": 25600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 360×440×80 mm: 360 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 40.0 mm radial section packed with small-diameter needle rollers C is 740 kN and C0 2020 kN at the 360 mm seat; the C/C0 ratio of 0.37 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 440 mm outside diameter the fatigue load limit Cur is 260 kN, the limiting speed 1,210 r/min and the thermal reference speed 590 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.06 kN/mm and per millimetre of width 9.25 kN/mm — the reason 80 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 25.6 kg (25600 g), just 0.73 g per mm² of projected 440×80 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 360 mm bore this is among the largest catalogue sizes; the 1,210 r/min limiting speed confirms a slow-speed, extreme-load application such as a slewing or rolling-mill position The 40.0 mm section still holds a full needle pack; like all needle bearings it cannot tolerate angular misalignment, so shaft and housing axes must be parallel NA4872-XL is supplied with a machined inner ring, so it mounts on an ordinary turned and ground shaft of normal tolerance — hardening the journal is not required As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 260 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 440 mm outside diameter and 740 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 360 mm seat, and in gearbox selector and change linkages the 25.6 kg mass is part of the rotor inertia calculation. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 80 mm width and the published 2020 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NA4872-XL?", "a": "The NA4872-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 440 mm outside diameter, 360 mm bore and 80 mm width, envelope 360×440×80 mm. Mass is 25.6 kg." }, { "q": "What does the NA4872-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4872-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 360×440×80 mm and the catalogue ratings are C 740 kN, C0 2020 kN, Cur 260 kN." }, { "q": "What is the load capacity of the NA4872-XL?", "a": "The basic dynamic load rating C is 740 kN and the basic static load rating C0 is 2020 kN; the fatigue load limit Cur is 260 kN." }, { "q": "What is the maximum speed of the NA4872-XL?", "a": "The limiting speed is 1,210 r/min and the thermal reference speed is 590 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4872-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 360 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4872", "equiv_brand": "SKF", "level": "partial", "note": "Same 360×440×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4872-XL", "NA4872-XL" ], "locale_variants": {} }, { "sku": "NA4876-XL", "brand": "FAG", "manufacturer_designation": "NA4876-XL", "series": "na48-series", "type": "needle", "d_mm": 380, "D_mm": 480, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1130, "static_load_kN": 2900, "fatigue_load_limit_kN": 375, "limiting_speed_rpm": 1130, "max_rpm": 1130, "reference_speed_rpm": 510, "weight_g": 42600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 380×480×100 mm: 380 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 50.0 mm radial section packed with small-diameter needle rollers C is 1130 kN and C0 2900 kN at the 380 mm seat; the C/C0 ratio of 0.39 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 480 mm outside diameter the fatigue load limit Cur is 375 kN, the limiting speed 1,130 r/min and the thermal reference speed 510 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 2.97 kN/mm and per millimetre of width 11.30 kN/mm — the reason 100 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 42.6 kg (42600 g), just 0.89 g per mm² of projected 480×100 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 380 mm bore puts this execution at the top of the HR1 range — the 480 mm outside diameter, 100 mm width and 42.6 kg mass are built for primary-industry load cases The inner ring is separable, so the outer-ring/roller assembly can be pressed into the housing first; the 2900 kN C0 rating still assumes full rigid support under both rings Cur 375 kN, limiting speed 1,130 r/min, reference speed 510 r/min — the inner ring adds a few grams (total 42600 g) but removes the hardening requirement -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 1130 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 480 mm outside diameter and 1130 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 380 mm seat, and in textile machine heald and cam shafts the 42.6 kg mass is part of the rotor inertia calculation. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 100 mm width and the published 2900 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NA4876-XL?", "a": "The NA4876-XL is a NA48 dimension-series 48 needle roller bearing with inner ring with 480 mm outside diameter, 380 mm bore and 100 mm width, envelope 380×480×100 mm. Mass is 42.6 kg." }, { "q": "What does the NA4876-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NA4876-XL identifies this NA48 dimension-series 48 needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 380×480×100 mm and the catalogue ratings are C 1130 kN, C0 2900 kN, Cur 375 kN." }, { "q": "What is the load capacity of the NA4876-XL?", "a": "The basic dynamic load rating C is 1130 kN and the basic static load rating C0 is 2900 kN; the fatigue load limit Cur is 375 kN." }, { "q": "What is the maximum speed of the NA4876-XL?", "a": "The limiting speed is 1,130 r/min and the thermal reference speed is 510 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NA4876-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 380 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NA4876", "equiv_brand": "SKF", "level": "partial", "note": "Same 380×480×100 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=963", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA4876-XL", "NA4876-XL" ], "locale_variants": {} }, { "sku": "RNAO5X10X8-TV-XL", "brand": "FAG", "manufacturer_designation": "RNAO5×10×8-TV-XL", "series": "rnao-series", "type": "needle", "d_mm": 5, "D_mm": 10, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 2.65, "static_load_kN": 1.92, "fatigue_load_limit_kN": 0.3, "limiting_speed_rpm": 39000, "max_rpm": 39000, "reference_speed_rpm": 53000, "weight_g": 3, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×10×8 mm: 5 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 2.5 mm radial section packed with small-diameter needle rollers C is 2.65 kN and C0 1.92 kN at the 5 mm seat; the C/C0 ratio of 1.38 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 10 mm outside diameter the fatigue load limit Cur is 0.3 kN, the limiting speed 39,000 r/min and the thermal reference speed 53,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.53 kN/mm and per millimetre of width 0.33 kN/mm — the reason 8 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 3 g, just 0.04 g per mm² of projected 10×8 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 5 mm bore sits in the miniature band; at 8 mm wide the RNAO5×10×8-TV-XL is built into compact cam drives, indexing pawls and light linkages Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 5 mm hardened shaft journal and the housing faces provide all axial guidance As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 0.3 kN Cur value. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 10 mm outside diameter and 2.65 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 5 mm seat, and in two-stroke and compressor piston pins the 3 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 8 mm width and the published 1.92 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNAO5×10×8-TV-XL?", "a": "The RNAO5×10×8-TV-XL is a RNAO flangeless needle roller bearing without inner ring with 10 mm outside diameter, 5 mm bore and 8 mm width, envelope 5×10×8 mm. Mass is 3 g." }, { "q": "What does the RNAO5×10×8-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO5×10×8-TV-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 5×10×8 mm and the catalogue ratings are C 2.65 kN, C0 1.92 kN, Cur 0.3 kN." }, { "q": "What is the load capacity of the RNAO5×10×8-TV-XL?", "a": "The basic dynamic load rating C is 2.65 kN and the basic static load rating C0 is 1.92 kN; the fatigue load limit Cur is 0.3 kN." }, { "q": "What is the maximum speed of the RNAO5×10×8-TV-XL?", "a": "The limiting speed is 39,000 r/min and the thermal reference speed is 53,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO5×10×8-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO5×10×8-TV-XL has no inner ring, so the 5 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO5X10X8", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO5X10X8-TV-XL", "RNAO5×10×8-TV-XL" ], "locale_variants": {} }, { "sku": "RNAO6X13X8-TV-XL", "brand": "FAG", "manufacturer_designation": "RNAO6×13×8-TV-XL", "series": "rnao-series", "type": "needle", "d_mm": 6, "D_mm": 13, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 2.95, "static_load_kN": 2.28, "fatigue_load_limit_kN": 0.36, "limiting_speed_rpm": 36500, "max_rpm": 36500, "reference_speed_rpm": 48500, "weight_g": 6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×13×8 mm: 6 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 2.95 kN and C0 2.28 kN at the 6 mm seat; the C/C0 ratio of 1.29 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 13 mm outside diameter the fatigue load limit Cur is 0.36 kN, the limiting speed 36,500 r/min and the thermal reference speed 48,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.49 kN/mm and per millimetre of width 0.37 kN/mm — the reason 8 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 6 g, just 0.06 g per mm² of projected 13×8 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 6 mm bore this is one of the smallest HR1 executions — chosen where a 13 mm envelope must carry line-contact loads that no miniature ball bearing could take With no ribs the rollers can be arranged very freely in the 8 mm width, giving C 2.95 kN at only 13 mm outside diameter — the most compact radial unit in the HR1 needle section Cur 0.36 kN and speeds up to 36,500 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 0.36 kN Cur value. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 6 g in the 13 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 13 mm outside diameter and 2.95 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 6 mm seat, and in copying and printing machine mechanisms the 6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 8 mm width and the published 2.28 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO6×13×8-TV-XL?", "a": "The RNAO6×13×8-TV-XL is a RNAO flangeless needle roller bearing without inner ring with 13 mm outside diameter, 6 mm bore and 8 mm width, envelope 6×13×8 mm. Mass is 6 g." }, { "q": "What does the RNAO6×13×8-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO6×13×8-TV-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 6×13×8 mm and the catalogue ratings are C 2.95 kN, C0 2.28 kN, Cur 0.36 kN." }, { "q": "What is the load capacity of the RNAO6×13×8-TV-XL?", "a": "The basic dynamic load rating C is 2.95 kN and the basic static load rating C0 is 2.28 kN; the fatigue load limit Cur is 0.36 kN." }, { "q": "What is the maximum speed of the RNAO6×13×8-TV-XL?", "a": "The limiting speed is 36,500 r/min and the thermal reference speed is 48,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO6×13×8-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO6×13×8-TV-XL has no inner ring, so the 6 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO6X13X8", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO6X13X8-TV-XL", "RNAO6×13×8-TV-XL" ], "locale_variants": {} }, { "sku": "RNAO7X14X8-TV-XL", "brand": "FAG", "manufacturer_designation": "RNAO7×14×8-TV-XL", "series": "rnao-series", "type": "needle", "d_mm": 7, "D_mm": 14, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 3.25, "static_load_kN": 2.65, "fatigue_load_limit_kN": 0.42, "limiting_speed_rpm": 34500, "max_rpm": 34500, "reference_speed_rpm": 41500, "weight_g": 6, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 7×14×8 mm: 7 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 3.25 kN and C0 2.65 kN at the 7 mm seat; the C/C0 ratio of 1.23 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 14 mm outside diameter the fatigue load limit Cur is 0.42 kN, the limiting speed 34,500 r/min and the thermal reference speed 41,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.46 kN/mm and per millimetre of width 0.41 kN/mm — the reason 8 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 6 g, just 0.05 g per mm² of projected 14×8 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 7 mm bore and only 6 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 0.42 kN Cur value. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 34,500 r/min limiting speed without roller-to-roller sliding. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 14 mm outside diameter and 3.25 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 7 mm seat, and in textile machine heald and cam shafts the 6 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 8 mm width and the published 2.65 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO7×14×8-TV-XL?", "a": "The RNAO7×14×8-TV-XL is a RNAO flangeless needle roller bearing without inner ring with 14 mm outside diameter, 7 mm bore and 8 mm width, envelope 7×14×8 mm. Mass is 6 g." }, { "q": "What does the RNAO7×14×8-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO7×14×8-TV-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 7×14×8 mm and the catalogue ratings are C 3.25 kN, C0 2.65 kN, Cur 0.42 kN." }, { "q": "What is the load capacity of the RNAO7×14×8-TV-XL?", "a": "The basic dynamic load rating C is 3.25 kN and the basic static load rating C0 is 2.65 kN; the fatigue load limit Cur is 0.42 kN." }, { "q": "What is the maximum speed of the RNAO7×14×8-TV-XL?", "a": "The limiting speed is 34,500 r/min and the thermal reference speed is 41,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO7×14×8-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO7×14×8-TV-XL has no inner ring, so the 7 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO7X14X8", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO7X14X8-TV-XL", "RNAO7×14×8-TV-XL" ], "locale_variants": {} }, { "sku": "RNAO8X15X10-TV-XL", "brand": "FAG", "manufacturer_designation": "RNAO8×15×10-TV-XL", "series": "rnao-series", "type": "needle", "d_mm": 8, "D_mm": 15, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 4.45, "static_load_kN": 4.1, "fatigue_load_limit_kN": 0.7, "limiting_speed_rpm": 32500, "max_rpm": 32500, "reference_speed_rpm": 35500, "weight_g": 8, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×15×10 mm: 8 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 4.45 kN and C0 4.1 kN at the 8 mm seat; the C/C0 ratio of 1.09 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 15 mm outside diameter the fatigue load limit Cur is 0.7 kN, the limiting speed 32,500 r/min and the thermal reference speed 35,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.56 kN/mm and per millimetre of width 0.45 kN/mm — the reason 10 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 8 g, just 0.05 g per mm² of projected 15×10 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 8 mm bore and only 8 g: the smallest sizes demand accurate shaft geometry, because the 3.5 mm section leaves no tolerance for a soft or tapered seat The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 4.1 kN static rating cannot be used RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 8 mm hardened shaft journal and the housing faces provide all axial guidance The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 8×15×10 mm envelope. With the -TV polyamide cage the rollers are positively separated, so the 8 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 15 mm outside diameter and 4.45 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 8 mm seat, and in textile machine heald and cam shafts the 8 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 10 mm width and the published 4.1 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNAO8×15×10-TV-XL?", "a": "The RNAO8×15×10-TV-XL is a RNAO flangeless needle roller bearing without inner ring with 15 mm outside diameter, 8 mm bore and 10 mm width, envelope 8×15×10 mm. Mass is 8 g." }, { "q": "What does the RNAO8×15×10-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO8×15×10-TV-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 8×15×10 mm and the catalogue ratings are C 4.45 kN, C0 4.1 kN, Cur 0.7 kN." }, { "q": "What is the load capacity of the RNAO8×15×10-TV-XL?", "a": "The basic dynamic load rating C is 4.45 kN and the basic static load rating C0 is 4.1 kN; the fatigue load limit Cur is 0.7 kN." }, { "q": "What is the maximum speed of the RNAO8×15×10-TV-XL?", "a": "The limiting speed is 32,500 r/min and the thermal reference speed is 35,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO8×15×10-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO8×15×10-TV-XL has no inner ring, so the 8 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO8X15X10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO8X15X10-TV-XL", "RNAO8×15×10-TV-XL" ], "locale_variants": {} }, { "sku": "RNAO10X17X10-TV-XL", "brand": "FAG", "manufacturer_designation": "RNAO10×17×10-TV-XL", "series": "rnao-series", "type": "needle", "d_mm": 10, "D_mm": 17, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.3, "static_load_kN": 5.5, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 29500, "max_rpm": 29500, "reference_speed_rpm": 28000, "weight_g": 10, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×17×10 mm: 10 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 3.5 mm radial section packed with small-diameter needle rollers C is 5.3 kN and C0 5.5 kN at the 10 mm seat; the C/C0 ratio of 0.96 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 17 mm outside diameter the fatigue load limit Cur is 0.94 kN, the limiting speed 29,500 r/min and the thermal reference speed 28,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.53 kN/mm and per millimetre of width 0.53 kN/mm — the reason 10 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 10 g, just 0.06 g per mm² of projected 17×10 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 10 mm bore sits in the miniature band; at 10 mm wide the RNAO10×17×10-TV-XL is built into compact cam drives, indexing pawls and light linkages With no ribs the rollers can be arranged very freely in the 10 mm width, giving C 5.3 kN at only 17 mm outside diameter — the most compact radial unit in the HR1 needle section At 10 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 10×17×10 mm envelope. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 17 mm outside diameter and 5.3 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 10 mm seat, and in two-stroke and compressor piston pins the 10 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 10 mm width and the published 5.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO10×17×10-TV-XL?", "a": "The RNAO10×17×10-TV-XL is a RNAO flangeless needle roller bearing without inner ring with 17 mm outside diameter, 10 mm bore and 10 mm width, envelope 10×17×10 mm. Mass is 10 g." }, { "q": "What does the RNAO10×17×10-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO10×17×10-TV-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 10×17×10 mm and the catalogue ratings are C 5.3 kN, C0 5.5 kN, Cur 0.94 kN." }, { "q": "What is the load capacity of the RNAO10×17×10-TV-XL?", "a": "The basic dynamic load rating C is 5.3 kN and the basic static load rating C0 is 5.5 kN; the fatigue load limit Cur is 0.94 kN." }, { "q": "What is the maximum speed of the RNAO10×17×10-TV-XL?", "a": "The limiting speed is 29,500 r/min and the thermal reference speed is 28,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO10×17×10-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO10×17×10-TV-XL has no inner ring, so the 10 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO10X17X10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO10X17X10-TV-XL", "RNAO10×17×10-TV-XL" ], "locale_variants": {} }, { "sku": "RNAO12X22X12-TV-XL", "brand": "FAG", "manufacturer_designation": "RNAO12×22×12-TV-XL", "series": "rnao-series", "type": "needle", "d_mm": 12, "D_mm": 22, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 11.3, "static_load_kN": 9.9, "fatigue_load_limit_kN": 1.77, "limiting_speed_rpm": 26000, "max_rpm": 26000, "reference_speed_rpm": 19700, "weight_g": 19, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×22×12 mm: 12 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 11.3 kN and C0 9.9 kN at the 12 mm seat; the C/C0 ratio of 1.14 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 1.77 kN, the limiting speed 26,000 r/min and the thermal reference speed 19,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.94 kN/mm and per millimetre of width 0.94 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 19 g, just 0.07 g per mm² of projected 22×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 12 mm bore this is one of the smallest HR1 executions — chosen where a 22 mm envelope must carry line-contact loads that no miniature ball bearing could take The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 9.9 kN static rating cannot be used With no ribs the rollers can be arranged very freely in the 12 mm width, giving C 11.3 kN at only 22 mm outside diameter — the most compact radial unit in the HR1 needle section The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 26,000 r/min limit. Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 19 g in the 22 mm envelope. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 22 mm outside diameter and 11.3 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 12 mm seat, and in agricultural machine pivots and linkages the 19 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 12 mm width and the published 9.9 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNAO12×22×12-TV-XL?", "a": "The RNAO12×22×12-TV-XL is a RNAO flangeless needle roller bearing without inner ring with 22 mm outside diameter, 12 mm bore and 12 mm width, envelope 12×22×12 mm. Mass is 19 g." }, { "q": "What does the RNAO12×22×12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO12×22×12-TV-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×22×12 mm and the catalogue ratings are C 11.3 kN, C0 9.9 kN, Cur 1.77 kN." }, { "q": "What is the load capacity of the RNAO12×22×12-TV-XL?", "a": "The basic dynamic load rating C is 11.3 kN and the basic static load rating C0 is 9.9 kN; the fatigue load limit Cur is 1.77 kN." }, { "q": "What is the maximum speed of the RNAO12×22×12-TV-XL?", "a": "The limiting speed is 26,000 r/min and the thermal reference speed is 19,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO12×22×12-TV-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO12×22×12-TV-XL has no inner ring, so the 12 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO12X22X12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO12X22X12-TV-XL", "RNAO12×22×12-TV-XL" ], "locale_variants": {} }, { "sku": "RNAO15X23X13-XL", "brand": "FAG", "manufacturer_designation": "RNAO15×23×13-XL", "series": "rnao-series", "type": "needle", "d_mm": 15, "D_mm": 23, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.7, "static_load_kN": 10.9, "fatigue_load_limit_kN": 1.79, "limiting_speed_rpm": 24300, "max_rpm": 24300, "reference_speed_rpm": 17900, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×23×13 mm: 15 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 9.7 kN and C0 10.9 kN at the 15 mm seat; the C/C0 ratio of 0.89 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 23 mm outside diameter the fatigue load limit Cur is 1.79 kN, the limiting speed 24,300 r/min and the thermal reference speed 17,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.65 kN/mm and per millimetre of width 0.75 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 20 g, just 0.07 g per mm² of projected 23×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 15 mm bore the 13 mm width and 9.7 kN C rating suit high-cycle industrial machinery rather than instrument duty Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore Cur 1.79 kN and speeds up to 24,300 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 15×23×13 mm envelope. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 23 mm outside diameter and 9.7 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 15 mm seat, and in connecting-rod small ends the 20 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 13 mm width and the published 10.9 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNAO15×23×13-XL?", "a": "The RNAO15×23×13-XL is a RNAO flangeless needle roller bearing without inner ring with 23 mm outside diameter, 15 mm bore and 13 mm width, envelope 15×23×13 mm. Mass is 20 g." }, { "q": "What does the RNAO15×23×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO15×23×13-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×23×13 mm and the catalogue ratings are C 9.7 kN, C0 10.9 kN, Cur 1.79 kN." }, { "q": "What is the load capacity of the RNAO15×23×13-XL?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 10.9 kN; the fatigue load limit Cur is 1.79 kN." }, { "q": "What is the maximum speed of the RNAO15×23×13-XL?", "a": "The limiting speed is 24,300 r/min and the thermal reference speed is 17,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO15×23×13-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO15×23×13-XL has no inner ring, so the 15 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO15X23X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO15X23X13-XL", "RNAO15×23×13-XL" ], "locale_variants": {} }, { "sku": "RNAO16X24X13-XL", "brand": "FAG", "manufacturer_designation": "RNAO16×24×13-XL", "series": "rnao-series", "type": "needle", "d_mm": 16, "D_mm": 24, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.1, "static_load_kN": 11.8, "fatigue_load_limit_kN": 1.93, "limiting_speed_rpm": 23600, "max_rpm": 23600, "reference_speed_rpm": 16800, "weight_g": 21, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×24×13 mm: 16 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 10.1 kN and C0 11.8 kN at the 16 mm seat; the C/C0 ratio of 0.86 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 1.93 kN, the limiting speed 23,600 r/min and the thermal reference speed 16,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.63 kN/mm and per millimetre of width 0.78 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 21 g, just 0.07 g per mm² of projected 24×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 16 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty With no ribs the rollers can be arranged very freely in the 13 mm width, giving C 10.1 kN at only 24 mm outside diameter — the most compact radial unit in the HR1 needle section Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 10.1 kN C rating and longer nominal life come without an envelope change. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 24 mm outside diameter and 10.1 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 16 mm seat, and in planetary gear bearings the 21 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 13 mm width and the published 11.8 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO16×24×13-XL?", "a": "The RNAO16×24×13-XL is a RNAO flangeless needle roller bearing without inner ring with 24 mm outside diameter, 16 mm bore and 13 mm width, envelope 16×24×13 mm. Mass is 21 g." }, { "q": "What does the RNAO16×24×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO16×24×13-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×24×13 mm and the catalogue ratings are C 10.1 kN, C0 11.8 kN, Cur 1.93 kN." }, { "q": "What is the load capacity of the RNAO16×24×13-XL?", "a": "The basic dynamic load rating C is 10.1 kN and the basic static load rating C0 is 11.8 kN; the fatigue load limit Cur is 1.93 kN." }, { "q": "What is the maximum speed of the RNAO16×24×13-XL?", "a": "The limiting speed is 23,600 r/min and the thermal reference speed is 16,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO16×24×13-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO16×24×13-XL has no inner ring, so the 16 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO16X24X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO16X24X13-XL", "RNAO16×24×13-XL" ], "locale_variants": {} }, { "sku": "RNAO16X28X12-XL", "brand": "FAG", "manufacturer_designation": "RNAO16×28×12-XL", "series": "rnao-series", "type": "needle", "d_mm": 16, "D_mm": 28, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13, "static_load_kN": 12.5, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 22900, "max_rpm": 22900, "reference_speed_rpm": 15900, "weight_g": 32, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×28×12 mm: 16 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 13 kN and C0 12.5 kN at the 16 mm seat; the C/C0 ratio of 1.04 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.25 kN, the limiting speed 22,900 r/min and the thermal reference speed 15,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.81 kN/mm and per millimetre of width 1.08 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 32 g, just 0.10 g per mm² of projected 28×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 16 mm bore this size balances the 28 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore Cur 2.25 kN and speeds up to 22,900 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter X-life status (-XL) indicates the current Schaeffler premium execution at 16 mm bore; the 12.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 28 mm outside diameter and 13 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 16 mm seat, and in textile machine heald and cam shafts the 32 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 12 mm width and the published 12.5 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNAO16×28×12-XL?", "a": "The RNAO16×28×12-XL is a RNAO flangeless needle roller bearing without inner ring with 28 mm outside diameter, 16 mm bore and 12 mm width, envelope 16×28×12 mm. Mass is 32 g." }, { "q": "What does the RNAO16×28×12-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO16×28×12-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×28×12 mm and the catalogue ratings are C 13 kN, C0 12.5 kN, Cur 2.25 kN." }, { "q": "What is the load capacity of the RNAO16×28×12-XL?", "a": "The basic dynamic load rating C is 13 kN and the basic static load rating C0 is 12.5 kN; the fatigue load limit Cur is 2.25 kN." }, { "q": "What is the maximum speed of the RNAO16×28×12-XL?", "a": "The limiting speed is 22,900 r/min and the thermal reference speed is 15,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO16×28×12-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO16×28×12-XL has no inner ring, so the 16 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO16X28X12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO16X28X12-XL", "RNAO16×28×12-XL" ], "locale_variants": {} }, { "sku": "RNAO17X25X13-XL", "brand": "FAG", "manufacturer_designation": "RNAO17×25×13-XL", "series": "rnao-series", "type": "needle", "d_mm": 17, "D_mm": 25, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.7, "static_load_kN": 14.6, "fatigue_load_limit_kN": 2.28, "limiting_speed_rpm": 22900, "max_rpm": 22900, "reference_speed_rpm": 15200, "weight_g": 22, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×25×13 mm: 17 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 11.7 kN and C0 14.6 kN at the 17 mm seat; the C/C0 ratio of 0.80 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 25 mm outside diameter the fatigue load limit Cur is 2.28 kN, the limiting speed 22,900 r/min and the thermal reference speed 15,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.69 kN/mm and per millimetre of width 0.90 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 22 g, just 0.07 g per mm² of projected 25×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 17 mm bore this size balances the 25 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 14.6 kN static rating cannot be used X-life status (-XL) indicates the current Schaeffler premium execution at 17 mm bore; the 14.6 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 25 mm outside diameter and 11.7 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 17 mm seat, and in gearbox selector and change linkages the 22 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 13 mm width and the published 14.6 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNAO17×25×13-XL?", "a": "The RNAO17×25×13-XL is a RNAO flangeless needle roller bearing without inner ring with 25 mm outside diameter, 17 mm bore and 13 mm width, envelope 17×25×13 mm. Mass is 22 g." }, { "q": "What does the RNAO17×25×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO17×25×13-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×25×13 mm and the catalogue ratings are C 11.7 kN, C0 14.6 kN, Cur 2.28 kN." }, { "q": "What is the load capacity of the RNAO17×25×13-XL?", "a": "The basic dynamic load rating C is 11.7 kN and the basic static load rating C0 is 14.6 kN; the fatigue load limit Cur is 2.28 kN." }, { "q": "What is the maximum speed of the RNAO17×25×13-XL?", "a": "The limiting speed is 22,900 r/min and the thermal reference speed is 15,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO17×25×13-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO17×25×13-XL has no inner ring, so the 17 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO17X25X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO17X25X13-XL", "RNAO17×25×13-XL" ], "locale_variants": {} }, { "sku": "RNAO18X30X24-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO18×30×24-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 18, "D_mm": 30, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 24.8, "static_load_kN": 30, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 21800, "max_rpm": 21800, "reference_speed_rpm": 14000, "weight_g": 69, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 18×30×24 mm: 18 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 24.8 kN and C0 30 kN at the 18 mm seat; the C/C0 ratio of 0.83 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 5.4 kN, the limiting speed 21,800 r/min and the thermal reference speed 14,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.38 kN/mm and per millimetre of width 1.03 kN/mm — the reason 24 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 69 g, just 0.10 g per mm² of projected 30×24 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 18 mm bore the 24 mm width and 24.8 kN C rating suit high-cycle industrial machinery rather than instrument duty RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 18 mm hardened shaft journal and the housing faces provide all axial guidance X-life status (-XL) indicates the current Schaeffler premium execution at 18 mm bore; the 30 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 24 mm-wide envelope for higher capacity at the same bore. The ASR groove is particularly useful on double-row -ZW executions, feeding both rows evenly across the 30 mm outer ring. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 30 mm outside diameter and 24.8 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 18 mm seat, and in planetary gear bearings the 69 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 24 mm width and the published 30 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNAO18×30×24-ZW-ASR1-XL?", "a": "The RNAO18×30×24-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 30 mm outside diameter, 18 mm bore and 24 mm width, envelope 18×30×24 mm. Mass is 69 g." }, { "q": "What does the RNAO18×30×24-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO18×30×24-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 18×30×24 mm and the catalogue ratings are C 24.8 kN, C0 30 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the RNAO18×30×24-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 24.8 kN and the basic static load rating C0 is 30 kN; the fatigue load limit Cur is 5.4 kN." }, { "q": "What is the maximum speed of the RNAO18×30×24-ZW-ASR1-XL?", "a": "The limiting speed is 21,800 r/min and the thermal reference speed is 14,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO18×30×24-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO18×30×24-ZW-ASR1-XL has no inner ring, so the 18 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO18X30X24", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO18X30X24-ZW-ASR1-XL", "RNAO18×30×24-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO20X28X13-XL", "brand": "FAG", "manufacturer_designation": "RNAO20×28×13-XL", "series": "rnao-series", "type": "needle", "d_mm": 20, "D_mm": 28, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.1, "static_load_kN": 14.3, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 21300, "max_rpm": 21300, "reference_speed_rpm": 13700, "weight_g": 25, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×28×13 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 11.1 kN and C0 14.3 kN at the 20 mm seat; the C/C0 ratio of 0.78 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.35 kN, the limiting speed 21,300 r/min and the thermal reference speed 13,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.55 kN/mm and per millimetre of width 0.85 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 25 g, just 0.07 g per mm² of projected 28×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 13 mm width and 11.1 kN C rating suit high-cycle industrial machinery rather than instrument duty Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal At 25 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 14.3 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 28 mm outside diameter and 11.1 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 20 mm seat, and in gearbox selector and change linkages the 25 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 13 mm width and the published 14.3 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO20×28×13-XL?", "a": "The RNAO20×28×13-XL is a RNAO flangeless needle roller bearing without inner ring with 28 mm outside diameter, 20 mm bore and 13 mm width, envelope 20×28×13 mm. Mass is 25 g." }, { "q": "What does the RNAO20×28×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO20×28×13-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×28×13 mm and the catalogue ratings are C 11.1 kN, C0 14.3 kN, Cur 2.35 kN." }, { "q": "What is the load capacity of the RNAO20×28×13-XL?", "a": "The basic dynamic load rating C is 11.1 kN and the basic static load rating C0 is 14.3 kN; the fatigue load limit Cur is 2.35 kN." }, { "q": "What is the maximum speed of the RNAO20×28×13-XL?", "a": "The limiting speed is 21,300 r/min and the thermal reference speed is 13,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO20×28×13-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO20×28×13-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO20X28X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO20X28X13-XL", "RNAO20×28×13-XL" ], "locale_variants": {} }, { "sku": "RNAO20X28X26-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO20×28×26-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 20, "D_mm": 28, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 19, "static_load_kN": 28.5, "fatigue_load_limit_kN": 4.7, "limiting_speed_rpm": 21300, "max_rpm": 21300, "reference_speed_rpm": 13700, "weight_g": 50, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×28×26 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 19 kN and C0 28.5 kN at the 20 mm seat; the C/C0 ratio of 0.67 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 4.7 kN, the limiting speed 21,300 r/min and the thermal reference speed 13,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.95 kN/mm and per millimetre of width 0.73 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 50 g, just 0.07 g per mm² of projected 28×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 20 mm bore this size balances the 28 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading RNAO: O denotes the ribless (open-sided) race design; ZW means two roller rows in the one envelope Cur 4.7 kN and speeds up to 21,300 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 21,300 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 20×28 mm ring pair, giving the 19 kN C rating in a housing space sized for a wide single bearing. -ASR1 leaves the envelope unchanged but requires a registering groove or port in the housing bore around the 20 mm seat. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 28 mm outside diameter and 19 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 20 mm seat, and in two-stroke and compressor piston pins the 50 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 26 mm width and the published 28.5 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNAO20×28×26-ZW-ASR1-XL?", "a": "The RNAO20×28×26-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 28 mm outside diameter, 20 mm bore and 26 mm width, envelope 20×28×26 mm. Mass is 50 g." }, { "q": "What does the RNAO20×28×26-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO20×28×26-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×28×26 mm and the catalogue ratings are C 19 kN, C0 28.5 kN, Cur 4.7 kN." }, { "q": "What is the load capacity of the RNAO20×28×26-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 19 kN and the basic static load rating C0 is 28.5 kN; the fatigue load limit Cur is 4.7 kN." }, { "q": "What is the maximum speed of the RNAO20×28×26-ZW-ASR1-XL?", "a": "The limiting speed is 21,300 r/min and the thermal reference speed is 13,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO20×28×26-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO20×28×26-ZW-ASR1-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO20X28X26", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO20X28X26-ZW-ASR1-XL", "RNAO20×28×26-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO20X32X12-XL", "brand": "FAG", "manufacturer_designation": "RNAO20×32×12-XL", "series": "rnao-series", "type": "needle", "d_mm": 20, "D_mm": 32, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.1, "static_load_kN": 16.2, "fatigue_load_limit_kN": 2.9, "limiting_speed_rpm": 20900, "max_rpm": 20900, "reference_speed_rpm": 12700, "weight_g": 38, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×32×12 mm: 20 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 15.1 kN and C0 16.2 kN at the 20 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 2.9 kN, the limiting speed 20,900 r/min and the thermal reference speed 12,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.76 kN/mm and per millimetre of width 1.26 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 38 g, just 0.10 g per mm² of projected 32×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 12 mm width and 15.1 kN C rating suit high-cycle industrial machinery rather than instrument duty Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 15.1 kN C rating and longer nominal life come without an envelope change. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 32 mm outside diameter and 15.1 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 20 mm seat, and in hydraulic and pneumatic pump eccentrics the 38 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 12 mm width and the published 16.2 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO20×32×12-XL?", "a": "The RNAO20×32×12-XL is a RNAO flangeless needle roller bearing without inner ring with 32 mm outside diameter, 20 mm bore and 12 mm width, envelope 20×32×12 mm. Mass is 38 g." }, { "q": "What does the RNAO20×32×12-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO20×32×12-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×32×12 mm and the catalogue ratings are C 15.1 kN, C0 16.2 kN, Cur 2.9 kN." }, { "q": "What is the load capacity of the RNAO20×32×12-XL?", "a": "The basic dynamic load rating C is 15.1 kN and the basic static load rating C0 is 16.2 kN; the fatigue load limit Cur is 2.9 kN." }, { "q": "What is the maximum speed of the RNAO20×32×12-XL?", "a": "The limiting speed is 20,900 r/min and the thermal reference speed is 12,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO20×32×12-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO20×32×12-XL has no inner ring, so the 20 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO20X32X12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO20X32X12-XL", "RNAO20×32×12-XL" ], "locale_variants": {} }, { "sku": "RNAO22X30X13-XL", "brand": "FAG", "manufacturer_designation": "RNAO22×30×13-XL", "series": "rnao-series", "type": "needle", "d_mm": 22, "D_mm": 30, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.8, "static_load_kN": 15.9, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 20400, "max_rpm": 20400, "reference_speed_rpm": 12400, "weight_g": 27, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×30×13 mm: 22 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 4.0 mm radial section packed with small-diameter needle rollers C is 11.8 kN and C0 15.9 kN at the 22 mm seat; the C/C0 ratio of 0.74 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 2.6 kN, the limiting speed 20,400 r/min and the thermal reference speed 12,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.54 kN/mm and per millimetre of width 0.91 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 27 g, just 0.07 g per mm² of projected 30×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 22 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore X-life status (-XL) indicates the current Schaeffler premium execution at 22 mm bore; the 15.9 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 30 mm outside diameter and 11.8 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 22 mm seat, and in planetary gear bearings the 27 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 13 mm width and the published 15.9 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNAO22×30×13-XL?", "a": "The RNAO22×30×13-XL is a RNAO flangeless needle roller bearing without inner ring with 30 mm outside diameter, 22 mm bore and 13 mm width, envelope 22×30×13 mm. Mass is 27 g." }, { "q": "What does the RNAO22×30×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO22×30×13-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×30×13 mm and the catalogue ratings are C 11.8 kN, C0 15.9 kN, Cur 2.6 kN." }, { "q": "What is the load capacity of the RNAO22×30×13-XL?", "a": "The basic dynamic load rating C is 11.8 kN and the basic static load rating C0 is 15.9 kN; the fatigue load limit Cur is 2.6 kN." }, { "q": "What is the maximum speed of the RNAO22×30×13-XL?", "a": "The limiting speed is 20,400 r/min and the thermal reference speed is 12,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO22×30×13-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO22×30×13-XL has no inner ring, so the 22 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO22X30X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO22X30X13-XL", "RNAO22×30×13-XL" ], "locale_variants": {} }, { "sku": "RNAO22X35X16-XL", "brand": "FAG", "manufacturer_designation": "RNAO22×35×16-XL", "series": "rnao-series", "type": "needle", "d_mm": 22, "D_mm": 35, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.6, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 19200, "max_rpm": 19200, "reference_speed_rpm": 11200, "weight_g": 59, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×35×16 mm: 22 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 22.6 kN and C0 25.5 kN at the 22 mm seat; the C/C0 ratio of 0.89 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 4.25 kN, the limiting speed 19,200 r/min and the thermal reference speed 11,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 1.41 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 59 g, just 0.11 g per mm² of projected 35×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 22 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty At 59 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts X-life status (-XL) indicates the current Schaeffler premium execution at 22 mm bore; the 25.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 35 mm outside diameter and 22.6 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 22 mm seat, and in gearbox selector and change linkages the 59 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 16 mm width and the published 25.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNAO22×35×16-XL?", "a": "The RNAO22×35×16-XL is a RNAO flangeless needle roller bearing without inner ring with 35 mm outside diameter, 22 mm bore and 16 mm width, envelope 22×35×16 mm. Mass is 59 g." }, { "q": "What does the RNAO22×35×16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO22×35×16-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 22×35×16 mm and the catalogue ratings are C 22.6 kN, C0 25.5 kN, Cur 4.25 kN." }, { "q": "What is the load capacity of the RNAO22×35×16-XL?", "a": "The basic dynamic load rating C is 22.6 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.25 kN." }, { "q": "What is the maximum speed of the RNAO22×35×16-XL?", "a": "The limiting speed is 19,200 r/min and the thermal reference speed is 11,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO22×35×16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO22×35×16-XL has no inner ring, so the 22 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO22X35X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO22X35X16-XL", "RNAO22×35×16-XL" ], "locale_variants": {} }, { "sku": "RNAO25X35X17-XL", "brand": "FAG", "manufacturer_designation": "RNAO25×35×17-XL", "series": "rnao-series", "type": "needle", "d_mm": 25, "D_mm": 35, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.8, "static_load_kN": 26, "fatigue_load_limit_kN": 4.3, "limiting_speed_rpm": 18100, "max_rpm": 18100, "reference_speed_rpm": 11000, "weight_g": 53, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×35×17 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 16.8 kN and C0 26 kN at the 25 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 4.3 kN, the limiting speed 18,100 r/min and the thermal reference speed 11,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.67 kN/mm and per millimetre of width 0.99 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 53 g, just 0.09 g per mm² of projected 35×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 25 mm bore this size balances the 35 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range At 53 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 4.3 kN Cur value. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 35 mm outside diameter and 16.8 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 25 mm seat, and in two-stroke and compressor piston pins the 53 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 17 mm width and the published 26 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNAO25×35×17-XL?", "a": "The RNAO25×35×17-XL is a RNAO flangeless needle roller bearing without inner ring with 35 mm outside diameter, 25 mm bore and 17 mm width, envelope 25×35×17 mm. Mass is 53 g." }, { "q": "What does the RNAO25×35×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO25×35×17-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×35×17 mm and the catalogue ratings are C 16.8 kN, C0 26 kN, Cur 4.3 kN." }, { "q": "What is the load capacity of the RNAO25×35×17-XL?", "a": "The basic dynamic load rating C is 16.8 kN and the basic static load rating C0 is 26 kN; the fatigue load limit Cur is 4.3 kN." }, { "q": "What is the maximum speed of the RNAO25×35×17-XL?", "a": "The limiting speed is 18,100 r/min and the thermal reference speed is 11,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO25×35×17-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO25×35×17-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO25X35X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO25X35X17-XL", "RNAO25×35×17-XL" ], "locale_variants": {} }, { "sku": "RNAO25X35X26-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO25×35×26-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 25, "D_mm": 35, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.9, "static_load_kN": 37, "fatigue_load_limit_kN": 6.1, "limiting_speed_rpm": 18100, "max_rpm": 18100, "reference_speed_rpm": 11200, "weight_g": 76, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×35×26 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 21.9 kN and C0 37 kN at the 25 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 6.1 kN, the limiting speed 18,100 r/min and the thermal reference speed 11,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 0.84 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 76 g, just 0.08 g per mm² of projected 35×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty At 76 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 37 kN static rating cannot be used -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 21.9 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 37 kN in this thin-section bearing — two rows support the static peak that a single row could not. -ASR1 marks the outer-ring lubrication feature: the annular groove distributes grease to both needle rows of the 26 mm-wide pack. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 35 mm outside diameter and 21.9 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 25 mm seat, and in textile machine heald and cam shafts the 76 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 26 mm width and the published 37 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNAO25×35×26-ZW-ASR1-XL?", "a": "The RNAO25×35×26-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 35 mm outside diameter, 25 mm bore and 26 mm width, envelope 25×35×26 mm. Mass is 76 g." }, { "q": "What does the RNAO25×35×26-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO25×35×26-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×35×26 mm and the catalogue ratings are C 21.9 kN, C0 37 kN, Cur 6.1 kN." }, { "q": "What is the load capacity of the RNAO25×35×26-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 21.9 kN and the basic static load rating C0 is 37 kN; the fatigue load limit Cur is 6.1 kN." }, { "q": "What is the maximum speed of the RNAO25×35×26-ZW-ASR1-XL?", "a": "The limiting speed is 18,100 r/min and the thermal reference speed is 11,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO25×35×26-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO25×35×26-ZW-ASR1-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO25X35X26", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO25X35X26-ZW-ASR1-XL", "RNAO25×35×26-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO25X37X16-XL", "brand": "FAG", "manufacturer_designation": "RNAO25×37×16-XL", "series": "rnao-series", "type": "needle", "d_mm": 25, "D_mm": 37, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.5, "static_load_kN": 27.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 10000, "weight_g": 60, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×37×16 mm: 25 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 23.5 kN and C0 27.5 kN at the 25 mm seat; the C/C0 ratio of 0.85 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 4.65 kN, the limiting speed 17,200 r/min and the thermal reference speed 10,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.94 kN/mm and per millimetre of width 1.47 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 60 g, just 0.10 g per mm² of projected 37×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 25 mm bore this size balances the 37 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range With no ribs the rollers can be arranged very freely in the 16 mm width, giving C 23.5 kN at only 37 mm outside diameter — the most compact radial unit in the HR1 needle section At 60 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 27.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 37 mm outside diameter and 23.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 25 mm seat, and in small electric motor accessory drives the 60 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 16 mm width and the published 27.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO25×37×16-XL?", "a": "The RNAO25×37×16-XL is a RNAO flangeless needle roller bearing without inner ring with 37 mm outside diameter, 25 mm bore and 16 mm width, envelope 25×37×16 mm. Mass is 60 g." }, { "q": "What does the RNAO25×37×16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO25×37×16-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×37×16 mm and the catalogue ratings are C 23.5 kN, C0 27.5 kN, Cur 4.65 kN." }, { "q": "What is the load capacity of the RNAO25×37×16-XL?", "a": "The basic dynamic load rating C is 23.5 kN and the basic static load rating C0 is 27.5 kN; the fatigue load limit Cur is 4.65 kN." }, { "q": "What is the maximum speed of the RNAO25×37×16-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 10,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO25×37×16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO25×37×16-XL has no inner ring, so the 25 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO25X37X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO25X37X16-XL", "RNAO25×37×16-XL" ], "locale_variants": {} }, { "sku": "RNAO30X40X17-XL", "brand": "FAG", "manufacturer_designation": "RNAO30×40×17-XL", "series": "rnao-series", "type": "needle", "d_mm": 30, "D_mm": 40, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.1, "static_load_kN": 34, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 15100, "max_rpm": 15100, "reference_speed_rpm": 8800, "weight_g": 60, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×40×17 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 22.1 kN and C0 34 kN at the 30 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 40 mm outside diameter the fatigue load limit Cur is 5.4 kN, the limiting speed 15,100 r/min and the thermal reference speed 8,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.74 kN/mm and per millimetre of width 1.30 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 60 g, just 0.09 g per mm² of projected 40×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Cur 5.4 kN and speeds up to 15,100 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter At 60 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 5.4 kN Cur value. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 40 mm outside diameter and 22.1 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 30 mm seat, and in motorcycle and light-vehicle transmissions the 60 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 17 mm width and the published 34 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNAO30×40×17-XL?", "a": "The RNAO30×40×17-XL is a RNAO flangeless needle roller bearing without inner ring with 40 mm outside diameter, 30 mm bore and 17 mm width, envelope 30×40×17 mm. Mass is 60 g." }, { "q": "What does the RNAO30×40×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO30×40×17-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×40×17 mm and the catalogue ratings are C 22.1 kN, C0 34 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the RNAO30×40×17-XL?", "a": "The basic dynamic load rating C is 22.1 kN and the basic static load rating C0 is 34 kN; the fatigue load limit Cur is 5.4 kN." }, { "q": "What is the maximum speed of the RNAO30×40×17-XL?", "a": "The limiting speed is 15,100 r/min and the thermal reference speed is 8,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO30×40×17-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO30×40×17-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO30X40X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO30X40X17-XL", "RNAO30×40×17-XL" ], "locale_variants": {} }, { "sku": "RNAO30X42X16-XL", "brand": "FAG", "manufacturer_designation": "RNAO30×42×16-XL", "series": "rnao-series", "type": "needle", "d_mm": 30, "D_mm": 42, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 33.5, "fatigue_load_limit_kN": 5.6, "limiting_speed_rpm": 14600, "max_rpm": 14600, "reference_speed_rpm": 8500, "weight_g": 59, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×42×16 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 26 kN and C0 33.5 kN at the 30 mm seat; the C/C0 ratio of 0.78 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 5.6 kN, the limiting speed 14,600 r/min and the thermal reference speed 8,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.87 kN/mm and per millimetre of width 1.63 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 59 g, just 0.09 g per mm² of projected 42×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 16 mm width and 26 kN C rating suit high-cycle industrial machinery rather than instrument duty RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 30 mm hardened shaft journal and the housing faces provide all axial guidance At 59 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 33.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 42 mm outside diameter and 26 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 30 mm seat, and in two-stroke and compressor piston pins the 59 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 16 mm width and the published 33.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO30×42×16-XL?", "a": "The RNAO30×42×16-XL is a RNAO flangeless needle roller bearing without inner ring with 42 mm outside diameter, 30 mm bore and 16 mm width, envelope 30×42×16 mm. Mass is 59 g." }, { "q": "What does the RNAO30×42×16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO30×42×16-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×42×16 mm and the catalogue ratings are C 26 kN, C0 33.5 kN, Cur 5.6 kN." }, { "q": "What is the load capacity of the RNAO30×42×16-XL?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 5.6 kN." }, { "q": "What is the maximum speed of the RNAO30×42×16-XL?", "a": "The limiting speed is 14,600 r/min and the thermal reference speed is 8,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO30×42×16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO30×42×16-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO30X42X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO30X42X16-XL", "RNAO30×42×16-XL" ], "locale_variants": {} }, { "sku": "RNAO30X42X32-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO30×42×32-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 30, "D_mm": 42, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45, "static_load_kN": 67, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 14600, "max_rpm": 14600, "reference_speed_rpm": 8500, "weight_g": 137, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×42×32 mm: 30 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 45 kN and C0 67 kN at the 30 mm seat; the C/C0 ratio of 0.67 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 11.3 kN, the limiting speed 14,600 r/min and the thermal reference speed 8,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.50 kN/mm and per millimetre of width 1.41 kN/mm — the reason 32 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 137 g, just 0.10 g per mm² of projected 42×32 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 30 mm bore this size balances the 42 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 67 kN static rating cannot be used At 137 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 67 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 32 mm-wide envelope for higher capacity at the same bore. The ASR groove is particularly useful on double-row -ZW executions, feeding both rows evenly across the 42 mm outer ring. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 42 mm outside diameter and 45 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 30 mm seat, and in hydraulic and pneumatic pump eccentrics the 137 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 32 mm width and the published 67 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO30×42×32-ZW-ASR1-XL?", "a": "The RNAO30×42×32-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 42 mm outside diameter, 30 mm bore and 32 mm width, envelope 30×42×32 mm. Mass is 137 g." }, { "q": "What does the RNAO30×42×32-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO30×42×32-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×42×32 mm and the catalogue ratings are C 45 kN, C0 67 kN, Cur 11.3 kN." }, { "q": "What is the load capacity of the RNAO30×42×32-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 45 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 11.3 kN." }, { "q": "What is the maximum speed of the RNAO30×42×32-ZW-ASR1-XL?", "a": "The limiting speed is 14,600 r/min and the thermal reference speed is 8,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO30×42×32-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO30×42×32-ZW-ASR1-XL has no inner ring, so the 30 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO30X42X32", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO30X42X32-ZW-ASR1-XL", "RNAO30×42×32-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO35X45X13-XL", "brand": "FAG", "manufacturer_designation": "RNAO35×45×13-XL", "series": "rnao-series", "type": "needle", "d_mm": 35, "D_mm": 45, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 18.3, "static_load_kN": 28, "fatigue_load_limit_kN": 4.55, "limiting_speed_rpm": 13100, "max_rpm": 13100, "reference_speed_rpm": 7800, "weight_g": 53, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×45×13 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 18.3 kN and C0 28 kN at the 35 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 4.55 kN, the limiting speed 13,100 r/min and the thermal reference speed 7,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.52 kN/mm and per millimetre of width 1.41 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 53 g, just 0.09 g per mm² of projected 45×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 45 mm envelope already carries ratings in the tens of kilonewtons With no ribs the rollers can be arranged very freely in the 13 mm width, giving C 18.3 kN at only 45 mm outside diameter — the most compact radial unit in the HR1 needle section The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 28 kN static rating cannot be used As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 4.55 kN Cur value. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 45 mm outside diameter and 18.3 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 35 mm seat, and in gearbox selector and change linkages the 53 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 13 mm width and the published 28 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNAO35×45×13-XL?", "a": "The RNAO35×45×13-XL is a RNAO flangeless needle roller bearing without inner ring with 45 mm outside diameter, 35 mm bore and 13 mm width, envelope 35×45×13 mm. Mass is 53 g." }, { "q": "What does the RNAO35×45×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO35×45×13-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×45×13 mm and the catalogue ratings are C 18.3 kN, C0 28 kN, Cur 4.55 kN." }, { "q": "What is the load capacity of the RNAO35×45×13-XL?", "a": "The basic dynamic load rating C is 18.3 kN and the basic static load rating C0 is 28 kN; the fatigue load limit Cur is 4.55 kN." }, { "q": "What is the maximum speed of the RNAO35×45×13-XL?", "a": "The limiting speed is 13,100 r/min and the thermal reference speed is 7,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO35×45×13-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO35×45×13-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO35X45X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO35X45X13-XL", "RNAO35×45×13-XL" ], "locale_variants": {} }, { "sku": "RNAO35X45X17-XL", "brand": "FAG", "manufacturer_designation": "RNAO35×45×17-XL", "series": "rnao-series", "type": "needle", "d_mm": 35, "D_mm": 45, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 13100, "max_rpm": 13100, "reference_speed_rpm": 7700, "weight_g": 69, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×45×17 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 23.5 kN and C0 38.5 kN at the 35 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 6.2 kN, the limiting speed 13,100 r/min and the thermal reference speed 7,700 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.67 kN/mm and per millimetre of width 1.38 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 69 g, just 0.09 g per mm² of projected 45×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 35 mm bore marks the medium range: mounting forces and fits become critical, and the 69 g mass calls for proper induction or press tooling rather than hand fitting RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 35 mm hardened shaft journal and the housing faces provide all axial guidance With no ribs the rollers can be arranged very freely in the 17 mm width, giving C 23.5 kN at only 45 mm outside diameter — the most compact radial unit in the HR1 needle section -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 23.5 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 45 mm outside diameter and 23.5 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 35 mm seat, and in textile machine heald and cam shafts the 69 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 17 mm width and the published 38.5 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNAO35×45×17-XL?", "a": "The RNAO35×45×17-XL is a RNAO flangeless needle roller bearing without inner ring with 45 mm outside diameter, 35 mm bore and 17 mm width, envelope 35×45×17 mm. Mass is 69 g." }, { "q": "What does the RNAO35×45×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO35×45×17-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×45×17 mm and the catalogue ratings are C 23.5 kN, C0 38.5 kN, Cur 6.2 kN." }, { "q": "What is the load capacity of the RNAO35×45×17-XL?", "a": "The basic dynamic load rating C is 23.5 kN and the basic static load rating C0 is 38.5 kN; the fatigue load limit Cur is 6.2 kN." }, { "q": "What is the maximum speed of the RNAO35×45×17-XL?", "a": "The limiting speed is 13,100 r/min and the thermal reference speed is 7,700 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO35×45×17-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO35×45×17-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO35X45X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO35X45X17-XL", "RNAO35×45×17-XL" ], "locale_variants": {} }, { "sku": "RNAO35X45X26-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO35×45×26-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 35, "D_mm": 45, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31.5, "static_load_kN": 56, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 13100, "max_rpm": 13100, "reference_speed_rpm": 7800, "weight_g": 91, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×45×26 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 31.5 kN and C0 56 kN at the 35 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 13,100 r/min and the thermal reference speed 7,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.90 kN/mm and per millimetre of width 1.21 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 91 g, just 0.08 g per mm² of projected 45×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 45 mm envelope already carries ratings in the tens of kilonewtons At 91 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 56 kN static rating cannot be used The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 13,100 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 35×45 mm ring pair, giving the 31.5 kN C rating in a housing space sized for a wide single bearing. -ASR1 leaves the envelope unchanged but requires a registering groove or port in the housing bore around the 35 mm seat. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 45 mm outside diameter and 31.5 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 35 mm seat, and in rocker arms and valve trains the 91 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 26 mm width and the published 56 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNAO35×45×26-ZW-ASR1-XL?", "a": "The RNAO35×45×26-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 45 mm outside diameter, 35 mm bore and 26 mm width, envelope 35×45×26 mm. Mass is 91 g." }, { "q": "What does the RNAO35×45×26-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO35×45×26-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×45×26 mm and the catalogue ratings are C 31.5 kN, C0 56 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the RNAO35×45×26-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 31.5 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the RNAO35×45×26-ZW-ASR1-XL?", "a": "The limiting speed is 13,100 r/min and the thermal reference speed is 7,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO35×45×26-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO35×45×26-ZW-ASR1-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO35X45X26", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO35X45X26-ZW-ASR1-XL", "RNAO35×45×26-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO35X47X16-XL", "brand": "FAG", "manufacturer_designation": "RNAO35×47×16-XL", "series": "rnao-series", "type": "needle", "d_mm": 35, "D_mm": 47, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.5, "static_load_kN": 37.5, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 12700, "max_rpm": 12700, "reference_speed_rpm": 7500, "weight_g": 78, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×47×16 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 37.5 kN at the 35 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 6.3 kN, the limiting speed 12,700 r/min and the thermal reference speed 7,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.79 kN/mm and per millimetre of width 1.72 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 78 g, just 0.10 g per mm² of projected 47×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 16 mm width as a standard mounting space The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 37.5 kN static rating cannot be used With no ribs the rollers can be arranged very freely in the 16 mm width, giving C 27.5 kN at only 47 mm outside diameter — the most compact radial unit in the HR1 needle section As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 6.3 kN Cur value. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 47 mm outside diameter and 27.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 35 mm seat, and in connecting-rod small ends the 78 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 16 mm width and the published 37.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNAO35×47×16-XL?", "a": "The RNAO35×47×16-XL is a RNAO flangeless needle roller bearing without inner ring with 47 mm outside diameter, 35 mm bore and 16 mm width, envelope 35×47×16 mm. Mass is 78 g." }, { "q": "What does the RNAO35×47×16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO35×47×16-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×47×16 mm and the catalogue ratings are C 27.5 kN, C0 37.5 kN, Cur 6.3 kN." }, { "q": "What is the load capacity of the RNAO35×47×16-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 37.5 kN; the fatigue load limit Cur is 6.3 kN." }, { "q": "What is the maximum speed of the RNAO35×47×16-XL?", "a": "The limiting speed is 12,700 r/min and the thermal reference speed is 7,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO35×47×16-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO35×47×16-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO35X47X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO35X47X16-XL", "RNAO35×47×16-XL" ], "locale_variants": {} }, { "sku": "RNAO35X47X18-XL", "brand": "FAG", "manufacturer_designation": "RNAO35×47×18-XL", "series": "rnao-series", "type": "needle", "d_mm": 35, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31, "static_load_kN": 43, "fatigue_load_limit_kN": 7.5, "limiting_speed_rpm": 12700, "max_rpm": 12700, "reference_speed_rpm": 7400, "weight_g": 89, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×47×18 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 31 kN and C0 43 kN at the 35 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 7.5 kN, the limiting speed 12,700 r/min and the thermal reference speed 7,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.89 kN/mm and per millimetre of width 1.72 kN/mm — the reason 18 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 89 g, just 0.11 g per mm² of projected 47×18 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 18 mm width as a standard mounting space Cur 7.5 kN and speeds up to 12,700 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 35 mm hardened shaft journal and the housing faces provide all axial guidance -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 31 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 47 mm outside diameter and 31 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 35 mm seat, and in textile machine heald and cam shafts the 89 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 18 mm width and the published 43 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNAO35×47×18-XL?", "a": "The RNAO35×47×18-XL is a RNAO flangeless needle roller bearing without inner ring with 47 mm outside diameter, 35 mm bore and 18 mm width, envelope 35×47×18 mm. Mass is 89 g." }, { "q": "What does the RNAO35×47×18-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO35×47×18-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×47×18 mm and the catalogue ratings are C 31 kN, C0 43 kN, Cur 7.5 kN." }, { "q": "What is the load capacity of the RNAO35×47×18-XL?", "a": "The basic dynamic load rating C is 31 kN and the basic static load rating C0 is 43 kN; the fatigue load limit Cur is 7.5 kN." }, { "q": "What is the maximum speed of the RNAO35×47×18-XL?", "a": "The limiting speed is 12,700 r/min and the thermal reference speed is 7,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO35×47×18-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO35×47×18-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO35X47X18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO35X47X18-XL", "RNAO35×47×18-XL" ], "locale_variants": {} }, { "sku": "RNAO35X47X32-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO35×47×32-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 35, "D_mm": 47, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 47.5, "static_load_kN": 75, "fatigue_load_limit_kN": 12.6, "limiting_speed_rpm": 12700, "max_rpm": 12700, "reference_speed_rpm": 7500, "weight_g": 156, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×47×32 mm: 35 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 47.5 kN and C0 75 kN at the 35 mm seat; the C/C0 ratio of 0.63 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 12.6 kN, the limiting speed 12,700 r/min and the thermal reference speed 7,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.36 kN/mm and per millimetre of width 1.48 kN/mm — the reason 32 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 156 g, just 0.10 g per mm² of projected 47×32 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 35 mm bore places this bearing in the medium band, where the 47 mm envelope already carries ratings in the tens of kilonewtons Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal Reading RNAO: O denotes the ribless (open-sided) race design; ZW means two roller rows in the one envelope -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 47.5 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 75 kN in this thin-section bearing — two rows support the static peak that a single row could not. -ASR1 marks the outer-ring lubrication feature: the annular groove distributes grease to both needle rows of the 32 mm-wide pack. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 47 mm outside diameter and 47.5 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 35 mm seat, and in gearbox selector and change linkages the 156 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 32 mm width and the published 75 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO35×47×32-ZW-ASR1-XL?", "a": "The RNAO35×47×32-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 47 mm outside diameter, 35 mm bore and 32 mm width, envelope 35×47×32 mm. Mass is 156 g." }, { "q": "What does the RNAO35×47×32-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO35×47×32-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×47×32 mm and the catalogue ratings are C 47.5 kN, C0 75 kN, Cur 12.6 kN." }, { "q": "What is the load capacity of the RNAO35×47×32-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 47.5 kN and the basic static load rating C0 is 75 kN; the fatigue load limit Cur is 12.6 kN." }, { "q": "What is the maximum speed of the RNAO35×47×32-ZW-ASR1-XL?", "a": "The limiting speed is 12,700 r/min and the thermal reference speed is 7,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO35×47×32-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO35×47×32-ZW-ASR1-XL has no inner ring, so the 35 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO35X47X32", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=967", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO35X47X32-ZW-ASR1-XL", "RNAO35×47×32-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO40X50X17-XL", "brand": "FAG", "manufacturer_designation": "RNAO40×50×17-XL", "series": "rnao-series", "type": "needle", "d_mm": 40, "D_mm": 50, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 24.2, "static_load_kN": 41.5, "fatigue_load_limit_kN": 6.6, "limiting_speed_rpm": 11500, "max_rpm": 11500, "reference_speed_rpm": 7000, "weight_g": 74, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×50×17 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 24.2 kN and C0 41.5 kN at the 40 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 6.6 kN, the limiting speed 11,500 r/min and the thermal reference speed 7,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.60 kN/mm and per millimetre of width 1.42 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 74 g, just 0.09 g per mm² of projected 50×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 40 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 17 mm width as a standard mounting space Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 40×50×17 mm envelope. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 50 mm outside diameter and 24.2 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 40 mm seat, and in two-stroke and compressor piston pins the 74 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 17 mm width and the published 41.5 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO40×50×17-XL?", "a": "The RNAO40×50×17-XL is a RNAO flangeless needle roller bearing without inner ring with 50 mm outside diameter, 40 mm bore and 17 mm width, envelope 40×50×17 mm. Mass is 74 g." }, { "q": "What does the RNAO40×50×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO40×50×17-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×50×17 mm and the catalogue ratings are C 24.2 kN, C0 41.5 kN, Cur 6.6 kN." }, { "q": "What is the load capacity of the RNAO40×50×17-XL?", "a": "The basic dynamic load rating C is 24.2 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 6.6 kN." }, { "q": "What is the maximum speed of the RNAO40×50×17-XL?", "a": "The limiting speed is 11,500 r/min and the thermal reference speed is 7,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO40×50×17-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO40×50×17-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO40X50X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO40X50X17-XL", "RNAO40×50×17-XL" ], "locale_variants": {} }, { "sku": "RNAO40X50X34-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO40×50×34-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 40, "D_mm": 50, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 41.5, "static_load_kN": 83, "fatigue_load_limit_kN": 13.1, "limiting_speed_rpm": 11500, "max_rpm": 11500, "reference_speed_rpm": 7000, "weight_g": 152, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×50×34 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 41.5 kN and C0 83 kN at the 40 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 13.1 kN, the limiting speed 11,500 r/min and the thermal reference speed 7,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.04 kN/mm and per millimetre of width 1.22 kN/mm — the reason 34 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 152 g, just 0.09 g per mm² of projected 50×34 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 40 mm bore places this bearing in the medium band, where the 50 mm envelope already carries ratings in the tens of kilonewtons RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 40 mm hardened shaft journal and the housing faces provide all axial guidance With no ribs the rollers can be arranged very freely in the 34 mm width, giving C 41.5 kN at only 50 mm outside diameter — the most compact radial unit in the HR1 needle section The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 40×50×34 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 34 mm width while the outside diameter stays a compact 50 mm. The -ASR1 suffix provides an annular groove with lubrication holes in the outer ring, fed directly from the housing side. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 50 mm outside diameter and 41.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 40 mm seat, and in motorcycle and light-vehicle transmissions the 152 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 34 mm width and the published 83 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the RNAO40×50×34-ZW-ASR1-XL?", "a": "The RNAO40×50×34-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 50 mm outside diameter, 40 mm bore and 34 mm width, envelope 40×50×34 mm. Mass is 152 g." }, { "q": "What does the RNAO40×50×34-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO40×50×34-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×50×34 mm and the catalogue ratings are C 41.5 kN, C0 83 kN, Cur 13.1 kN." }, { "q": "What is the load capacity of the RNAO40×50×34-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 41.5 kN and the basic static load rating C0 is 83 kN; the fatigue load limit Cur is 13.1 kN." }, { "q": "What is the maximum speed of the RNAO40×50×34-ZW-ASR1-XL?", "a": "The limiting speed is 11,500 r/min and the thermal reference speed is 7,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO40×50×34-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO40×50×34-ZW-ASR1-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO40X50X34", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO40X50X34-ZW-ASR1-XL", "RNAO40×50×34-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO40X55X20-XL", "brand": "FAG", "manufacturer_designation": "RNAO40×55×20-XL", "series": "rnao-series", "type": "needle", "d_mm": 40, "D_mm": 55, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 57, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 11300, "max_rpm": 11300, "reference_speed_rpm": 6600, "weight_g": 145, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×55×20 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 37 kN and C0 57 kN at the 40 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 11,300 r/min and the thermal reference speed 6,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.93 kN/mm and per millimetre of width 1.85 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 145 g, just 0.13 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 40 mm bore marks the medium range: mounting forces and fits become critical, and the 145 g mass calls for proper induction or press tooling rather than hand fitting Cur 9.1 kN and speeds up to 11,300 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal X-life status (-XL) indicates the current Schaeffler premium execution at 40 mm bore; the 57 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 55 mm outside diameter and 37 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 40 mm seat, and in copying and printing machine mechanisms the 145 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 57 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNAO40×55×20-XL?", "a": "The RNAO40×55×20-XL is a RNAO flangeless needle roller bearing without inner ring with 55 mm outside diameter, 40 mm bore and 20 mm width, envelope 40×55×20 mm. Mass is 145 g." }, { "q": "What does the RNAO40×55×20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO40×55×20-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×55×20 mm and the catalogue ratings are C 37 kN, C0 57 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the RNAO40×55×20-XL?", "a": "The basic dynamic load rating C is 37 kN and the basic static load rating C0 is 57 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the RNAO40×55×20-XL?", "a": "The limiting speed is 11,300 r/min and the thermal reference speed is 6,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO40×55×20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO40×55×20-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO40X55X20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO40X55X20-XL", "RNAO40×55×20-XL" ], "locale_variants": {} }, { "sku": "RNAO40X55X40-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO40×55×40-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 40, "D_mm": 55, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 70, "static_load_kN": 118, "fatigue_load_limit_kN": 19, "limiting_speed_rpm": 11100, "max_rpm": 11100, "reference_speed_rpm": 6500, "weight_g": 275, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×55×40 mm: 40 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 70 kN and C0 118 kN at the 40 mm seat; the C/C0 ratio of 0.59 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 19 kN, the limiting speed 11,100 r/min and the thermal reference speed 6,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.75 kN/mm and per millimetre of width 1.75 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 275 g, just 0.13 g per mm² of projected 55×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 40 mm bore marks the medium range: mounting forces and fits become critical, and the 275 g mass calls for proper induction or press tooling rather than hand fitting At 275 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts With no ribs the rollers can be arranged very freely in the 40 mm width, giving C 70 kN at only 55 mm outside diameter — the most compact radial unit in the HR1 needle section -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 70 kN C rating and longer nominal life come without an envelope change. The -ZW double-row pack explains the high C0 of 118 kN in this thin-section bearing — two rows support the static peak that a single row could not. -ASR1 marks the outer-ring lubrication feature: the annular groove distributes grease to both needle rows of the 40 mm-wide pack. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 55 mm outside diameter and 70 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 40 mm seat, and in planetary gear bearings the 275 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 40 mm width and the published 118 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO40×55×40-ZW-ASR1-XL?", "a": "The RNAO40×55×40-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 55 mm outside diameter, 40 mm bore and 40 mm width, envelope 40×55×40 mm. Mass is 275 g." }, { "q": "What does the RNAO40×55×40-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO40×55×40-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×55×40 mm and the catalogue ratings are C 70 kN, C0 118 kN, Cur 19 kN." }, { "q": "What is the load capacity of the RNAO40×55×40-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 70 kN and the basic static load rating C0 is 118 kN; the fatigue load limit Cur is 19 kN." }, { "q": "What is the maximum speed of the RNAO40×55×40-ZW-ASR1-XL?", "a": "The limiting speed is 11,100 r/min and the thermal reference speed is 6,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO40×55×40-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO40×55×40-ZW-ASR1-XL has no inner ring, so the 40 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO40X55X40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO40X55X40-ZW-ASR1-XL", "RNAO40×55×40-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO45X55X17-XL", "brand": "FAG", "manufacturer_designation": "RNAO45×55×17-XL", "series": "rnao-series", "type": "needle", "d_mm": 45, "D_mm": 55, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.5, "static_load_kN": 46, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 10300, "max_rpm": 10300, "reference_speed_rpm": 6300, "weight_g": 83, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×55×17 mm: 45 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 5.0 mm radial section packed with small-diameter needle rollers C is 25.5 kN and C0 46 kN at the 45 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 7.3 kN, the limiting speed 10,300 r/min and the thermal reference speed 6,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.57 kN/mm and per millimetre of width 1.50 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 83 g, just 0.09 g per mm² of projected 55×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 45 mm bore places this bearing in the medium band, where the 55 mm envelope already carries ratings in the tens of kilonewtons With no ribs the rollers can be arranged very freely in the 17 mm width, giving C 25.5 kN at only 55 mm outside diameter — the most compact radial unit in the HR1 needle section The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 46 kN static rating cannot be used The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 10,300 r/min limit. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 55 mm outside diameter and 25.5 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 45 mm seat, and in connecting-rod small ends the 83 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 17 mm width and the published 46 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the RNAO45×55×17-XL?", "a": "The RNAO45×55×17-XL is a RNAO flangeless needle roller bearing without inner ring with 55 mm outside diameter, 45 mm bore and 17 mm width, envelope 45×55×17 mm. Mass is 83 g." }, { "q": "What does the RNAO45×55×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO45×55×17-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×55×17 mm and the catalogue ratings are C 25.5 kN, C0 46 kN, Cur 7.3 kN." }, { "q": "What is the load capacity of the RNAO45×55×17-XL?", "a": "The basic dynamic load rating C is 25.5 kN and the basic static load rating C0 is 46 kN; the fatigue load limit Cur is 7.3 kN." }, { "q": "What is the maximum speed of the RNAO45×55×17-XL?", "a": "The limiting speed is 10,300 r/min and the thermal reference speed is 6,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO45×55×17-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO45×55×17-XL has no inner ring, so the 45 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO45X55X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO45X55X17-XL", "RNAO45×55×17-XL" ], "locale_variants": {} }, { "sku": "RNAO45X62X40-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO45×62×40-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 45, "D_mm": 62, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 135, "fatigue_load_limit_kN": 21.9, "limiting_speed_rpm": 10000, "max_rpm": 10000, "reference_speed_rpm": 5900, "weight_g": 377, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×62×40 mm: 45 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 76 kN and C0 135 kN at the 45 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 21.9 kN, the limiting speed 10,000 r/min and the thermal reference speed 5,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.69 kN/mm and per millimetre of width 1.90 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 377 g, just 0.15 g per mm² of projected 62×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 45 mm bore marks the medium range: mounting forces and fits become critical, and the 377 g mass calls for proper induction or press tooling rather than hand fitting Reading RNAO: O denotes the ribless (open-sided) race design; ZW means two roller rows in the one envelope With no ribs the rollers can be arranged very freely in the 40 mm width, giving C 76 kN at only 62 mm outside diameter — the most compact radial unit in the HR1 needle section X-life status (-XL) indicates the current Schaeffler premium execution at 45 mm bore; the 135 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 40 mm-wide envelope for higher capacity at the same bore. The ASR groove is particularly useful on double-row -ZW executions, feeding both rows evenly across the 62 mm outer ring. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 62 mm outside diameter and 76 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 45 mm seat, and in rocker arms and valve trains the 377 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 40 mm width and the published 135 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNAO45×62×40-ZW-ASR1-XL?", "a": "The RNAO45×62×40-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 62 mm outside diameter, 45 mm bore and 40 mm width, envelope 45×62×40 mm. Mass is 377 g." }, { "q": "What does the RNAO45×62×40-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO45×62×40-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×62×40 mm and the catalogue ratings are C 76 kN, C0 135 kN, Cur 21.9 kN." }, { "q": "What is the load capacity of the RNAO45×62×40-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 76 kN and the basic static load rating C0 is 135 kN; the fatigue load limit Cur is 21.9 kN." }, { "q": "What is the maximum speed of the RNAO45×62×40-ZW-ASR1-XL?", "a": "The limiting speed is 10,000 r/min and the thermal reference speed is 5,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO45×62×40-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO45×62×40-ZW-ASR1-XL has no inner ring, so the 45 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO45X62X40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO45X62X40-ZW-ASR1-XL", "RNAO45×62×40-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO50X62X20-XL", "brand": "FAG", "manufacturer_designation": "RNAO50×62×20-XL", "series": "rnao-series", "type": "needle", "d_mm": 50, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 30, "static_load_kN": 60, "fatigue_load_limit_kN": 9.7, "limiting_speed_rpm": 9300, "max_rpm": 9300, "reference_speed_rpm": 5800, "weight_g": 140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×62×20 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 30 kN and C0 60 kN at the 50 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 62 mm outside diameter the fatigue load limit Cur is 9.7 kN, the limiting speed 9,300 r/min and the thermal reference speed 5,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.60 kN/mm and per millimetre of width 1.50 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 140 g, just 0.11 g per mm² of projected 62×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 50 mm bore marks the medium range: mounting forces and fits become critical, and the 140 g mass calls for proper induction or press tooling rather than hand fitting Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 50 mm hardened shaft journal and the housing faces provide all axial guidance -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 30 kN C rating and longer nominal life come without an envelope change. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 62 mm outside diameter and 30 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 50 mm seat, and in two-stroke and compressor piston pins the 140 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 20 mm width and the published 60 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the RNAO50×62×20-XL?", "a": "The RNAO50×62×20-XL is a RNAO flangeless needle roller bearing without inner ring with 62 mm outside diameter, 50 mm bore and 20 mm width, envelope 50×62×20 mm. Mass is 140 g." }, { "q": "What does the RNAO50×62×20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO50×62×20-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×62×20 mm and the catalogue ratings are C 30 kN, C0 60 kN, Cur 9.7 kN." }, { "q": "What is the load capacity of the RNAO50×62×20-XL?", "a": "The basic dynamic load rating C is 30 kN and the basic static load rating C0 is 60 kN; the fatigue load limit Cur is 9.7 kN." }, { "q": "What is the maximum speed of the RNAO50×62×20-XL?", "a": "The limiting speed is 9,300 r/min and the thermal reference speed is 5,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO50×62×20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO50×62×20-XL has no inner ring, so the 50 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO50X62X20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO50X62X20-XL", "RNAO50×62×20-XL" ], "locale_variants": {} }, { "sku": "RNAO50X65X20-XL", "brand": "FAG", "manufacturer_designation": "RNAO50×65×20-XL", "series": "rnao-series", "type": "needle", "d_mm": 50, "D_mm": 65, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 40.5, "static_load_kN": 62, "fatigue_load_limit_kN": 11, "limiting_speed_rpm": 9100, "max_rpm": 9100, "reference_speed_rpm": 5600, "weight_g": 168, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×65×20 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 40.5 kN and C0 62 kN at the 50 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 65 mm outside diameter the fatigue load limit Cur is 11 kN, the limiting speed 9,100 r/min and the thermal reference speed 5,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.81 kN/mm and per millimetre of width 2.02 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 168 g, just 0.13 g per mm² of projected 65×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 50 mm bore places this bearing in the medium band, where the 65 mm envelope already carries ratings in the tens of kilonewtons At 168 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts Cur 11 kN and speeds up to 9,100 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 65 mm outside diameter and 40.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 50 mm seat, and in small electric motor accessory drives the 168 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 20 mm width and the published 62 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the RNAO50×65×20-XL?", "a": "The RNAO50×65×20-XL is a RNAO flangeless needle roller bearing without inner ring with 65 mm outside diameter, 50 mm bore and 20 mm width, envelope 50×65×20 mm. Mass is 168 g." }, { "q": "What does the RNAO50×65×20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO50×65×20-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×65×20 mm and the catalogue ratings are C 40.5 kN, C0 62 kN, Cur 11 kN." }, { "q": "What is the load capacity of the RNAO50×65×20-XL?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 62 kN; the fatigue load limit Cur is 11 kN." }, { "q": "What is the maximum speed of the RNAO50×65×20-XL?", "a": "The limiting speed is 9,100 r/min and the thermal reference speed is 5,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO50×65×20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO50×65×20-XL has no inner ring, so the 50 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO50X65X20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO50X65X20-XL", "RNAO50×65×20-XL" ], "locale_variants": {} }, { "sku": "RNAO50X65X40-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO50×65×40-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 50, "D_mm": 65, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69, "static_load_kN": 124, "fatigue_load_limit_kN": 22.1, "limiting_speed_rpm": 9100, "max_rpm": 9100, "reference_speed_rpm": 5600, "weight_g": 355, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×65×40 mm: 50 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 69 kN and C0 124 kN at the 50 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 65 mm outside diameter the fatigue load limit Cur is 22.1 kN, the limiting speed 9,100 r/min and the thermal reference speed 5,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.38 kN/mm and per millimetre of width 1.73 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 355 g, just 0.14 g per mm² of projected 65×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 50 mm bore marks the medium range: mounting forces and fits become critical, and the 355 g mass calls for proper induction or press tooling rather than hand fitting Cur 22.1 kN and speeds up to 9,100 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 50 mm hardened shaft journal and the housing faces provide all axial guidance The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 9,100 r/min limit. -ZW marks the double-row execution — two offset needle rows in one 50×65 mm ring pair, giving the 69 kN C rating in a housing space sized for a wide single bearing. -ASR1 leaves the envelope unchanged but requires a registering groove or port in the housing bore around the 50 mm seat. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 65 mm outside diameter and 69 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 50 mm seat, and in agricultural machine pivots and linkages the 355 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 40 mm width and the published 124 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNAO50×65×40-ZW-ASR1-XL?", "a": "The RNAO50×65×40-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 65 mm outside diameter, 50 mm bore and 40 mm width, envelope 50×65×40 mm. Mass is 355 g." }, { "q": "What does the RNAO50×65×40-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO50×65×40-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×65×40 mm and the catalogue ratings are C 69 kN, C0 124 kN, Cur 22.1 kN." }, { "q": "What is the load capacity of the RNAO50×65×40-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 69 kN and the basic static load rating C0 is 124 kN; the fatigue load limit Cur is 22.1 kN." }, { "q": "What is the maximum speed of the RNAO50×65×40-ZW-ASR1-XL?", "a": "The limiting speed is 9,100 r/min and the thermal reference speed is 5,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO50×65×40-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO50×65×40-ZW-ASR1-XL has no inner ring, so the 50 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO50X65X40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO50X65X40-ZW-ASR1-XL", "RNAO50×65×40-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO55X68X20-XL", "brand": "FAG", "manufacturer_designation": "RNAO55×68×20-XL", "series": "rnao-series", "type": "needle", "d_mm": 55, "D_mm": 68, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32, "static_load_kN": 66, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 8500, "max_rpm": 8500, "reference_speed_rpm": 5400, "weight_g": 166, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×68×20 mm: 55 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 32 kN and C0 66 kN at the 55 mm seat; the C/C0 ratio of 0.48 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 10.9 kN, the limiting speed 8,500 r/min and the thermal reference speed 5,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.58 kN/mm and per millimetre of width 1.60 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 166 g, just 0.12 g per mm² of projected 68×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 55 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore Flangeless races make this bearing purely radial — adjacent thrust washers or shoulders must locate the assembly axially and keep the rollers from walking off the journal The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 55×68×20 mm envelope. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 68 mm outside diameter and 32 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 55 mm seat, and in agricultural machine pivots and linkages the 166 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 20 mm width and the published 66 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO55×68×20-XL?", "a": "The RNAO55×68×20-XL is a RNAO flangeless needle roller bearing without inner ring with 68 mm outside diameter, 55 mm bore and 20 mm width, envelope 55×68×20 mm. Mass is 166 g." }, { "q": "What does the RNAO55×68×20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO55×68×20-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 55×68×20 mm and the catalogue ratings are C 32 kN, C0 66 kN, Cur 10.9 kN." }, { "q": "What is the load capacity of the RNAO55×68×20-XL?", "a": "The basic dynamic load rating C is 32 kN and the basic static load rating C0 is 66 kN; the fatigue load limit Cur is 10.9 kN." }, { "q": "What is the maximum speed of the RNAO55×68×20-XL?", "a": "The limiting speed is 8,500 r/min and the thermal reference speed is 5,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO55×68×20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO55×68×20-XL has no inner ring, so the 55 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO55X68X20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO55X68X20-XL", "RNAO55×68×20-XL" ], "locale_variants": {} }, { "sku": "RNAO60X78X20-XL", "brand": "FAG", "manufacturer_designation": "RNAO60×78×20-XL", "series": "rnao-series", "type": "needle", "d_mm": 60, "D_mm": 78, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 49.5, "static_load_kN": 85, "fatigue_load_limit_kN": 13.9, "limiting_speed_rpm": 7700, "max_rpm": 7700, "reference_speed_rpm": 4650, "weight_g": 255, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×78×20 mm: 60 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 49.5 kN and C0 85 kN at the 60 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 78 mm outside diameter the fatigue load limit Cur is 13.9 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.82 kN/mm and per millimetre of width 2.48 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 255 g, just 0.16 g per mm² of projected 78×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 60 mm bore marks the medium range: mounting forces and fits become critical, and the 255 g mass calls for proper induction or press tooling rather than hand fitting At 255 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts With no ribs the rollers can be arranged very freely in the 20 mm width, giving C 49.5 kN at only 78 mm outside diameter — the most compact radial unit in the HR1 needle section -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 49.5 kN C rating and longer nominal life come without an envelope change. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 78 mm outside diameter and 49.5 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 60 mm seat, and in copying and printing machine mechanisms the 255 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 20 mm width and the published 85 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO60×78×20-XL?", "a": "The RNAO60×78×20-XL is a RNAO flangeless needle roller bearing without inner ring with 78 mm outside diameter, 60 mm bore and 20 mm width, envelope 60×78×20 mm. Mass is 255 g." }, { "q": "What does the RNAO60×78×20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO60×78×20-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×78×20 mm and the catalogue ratings are C 49.5 kN, C0 85 kN, Cur 13.9 kN." }, { "q": "What is the load capacity of the RNAO60×78×20-XL?", "a": "The basic dynamic load rating C is 49.5 kN and the basic static load rating C0 is 85 kN; the fatigue load limit Cur is 13.9 kN." }, { "q": "What is the maximum speed of the RNAO60×78×20-XL?", "a": "The limiting speed is 7,700 r/min and the thermal reference speed is 4,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO60×78×20-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO60×78×20-XL has no inner ring, so the 60 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO60X78X20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO60X78X20-XL", "RNAO60×78×20-XL" ], "locale_variants": {} }, { "sku": "RNAO60X78X40-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "RNAO60×78×40-ZW-ASR1-XL", "series": "rnao-series", "type": "needle", "d_mm": 60, "D_mm": 78, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 85, "static_load_kN": 171, "fatigue_load_limit_kN": 28, "limiting_speed_rpm": 7700, "max_rpm": 7700, "reference_speed_rpm": 4650, "weight_g": 435, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×78×40 mm: 60 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 85 kN and C0 171 kN at the 60 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 78 mm outside diameter the fatigue load limit Cur is 28 kN, the limiting speed 7,700 r/min and the thermal reference speed 4,650 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.42 kN/mm and per millimetre of width 2.13 kN/mm — the reason 40 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 435 g, just 0.14 g per mm² of projected 78×40 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 60 mm bore marks the medium range: mounting forces and fits become critical, and the 435 g mass calls for proper induction or press tooling rather than hand fitting The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 171 kN static rating cannot be used At 435 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 60×78×40 mm envelope. Reading -ZW: two needle rows instead of one; the load is spread over the 40 mm width while the outside diameter stays a compact 78 mm. The -ASR1 suffix provides an annular groove with lubrication holes in the outer ring, fed directly from the housing side. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 78 mm outside diameter and 85 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 60 mm seat, and in hydraulic and pneumatic pump eccentrics the 435 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 40 mm width and the published 171 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO60×78×40-ZW-ASR1-XL?", "a": "The RNAO60×78×40-ZW-ASR1-XL is a RNAO flangeless needle roller bearing without inner ring with 78 mm outside diameter, 60 mm bore and 40 mm width, envelope 60×78×40 mm. Mass is 435 g." }, { "q": "What does the RNAO60×78×40-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO60×78×40-ZW-ASR1-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 60×78×40 mm and the catalogue ratings are C 85 kN, C0 171 kN, Cur 28 kN." }, { "q": "What is the load capacity of the RNAO60×78×40-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 85 kN and the basic static load rating C0 is 171 kN; the fatigue load limit Cur is 28 kN." }, { "q": "What is the maximum speed of the RNAO60×78×40-ZW-ASR1-XL?", "a": "The limiting speed is 7,700 r/min and the thermal reference speed is 4,650 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO60×78×40-ZW-ASR1-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO60×78×40-ZW-ASR1-XL has no inner ring, so the 60 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO60X78X40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO60X78X40-ZW-ASR1-XL", "RNAO60×78×40-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "RNAO65X85X30-XL", "brand": "FAG", "manufacturer_designation": "RNAO65×85×30-XL", "series": "rnao-series", "type": "needle", "d_mm": 65, "D_mm": 85, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 64, "static_load_kN": 123, "fatigue_load_limit_kN": 21.5, "limiting_speed_rpm": 7100, "max_rpm": 7100, "reference_speed_rpm": 4550, "weight_g": 464, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 65×85×30 mm: 65 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 64 kN and C0 123 kN at the 65 mm seat; the C/C0 ratio of 0.52 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 85 mm outside diameter the fatigue load limit Cur is 21.5 kN, the limiting speed 7,100 r/min and the thermal reference speed 4,550 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.98 kN/mm and per millimetre of width 2.13 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 464 g, just 0.18 g per mm² of projected 85×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 65 mm bore this is a heavy-industrial bearing: 464 g of stiff ring and roller set, specified where rigidity matters more than speed With no ribs the rollers can be arranged very freely in the 30 mm width, giving C 64 kN at only 85 mm outside diameter — the most compact radial unit in the HR1 needle section RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 65 mm hardened shaft journal and the housing faces provide all axial guidance -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 64 kN C rating and longer nominal life come without an envelope change. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 85 mm outside diameter and 64 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 65 mm seat, and in connecting-rod small ends the 464 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 123 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNAO65×85×30-XL?", "a": "The RNAO65×85×30-XL is a RNAO flangeless needle roller bearing without inner ring with 85 mm outside diameter, 65 mm bore and 30 mm width, envelope 65×85×30 mm. Mass is 464 g." }, { "q": "What does the RNAO65×85×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO65×85×30-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 65×85×30 mm and the catalogue ratings are C 64 kN, C0 123 kN, Cur 21.5 kN." }, { "q": "What is the load capacity of the RNAO65×85×30-XL?", "a": "The basic dynamic load rating C is 64 kN and the basic static load rating C0 is 123 kN; the fatigue load limit Cur is 21.5 kN." }, { "q": "What is the maximum speed of the RNAO65×85×30-XL?", "a": "The limiting speed is 7,100 r/min and the thermal reference speed is 4,550 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO65×85×30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO65×85×30-XL has no inner ring, so the 65 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO65X85X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO65X85X30-XL", "RNAO65×85×30-XL" ], "locale_variants": {} }, { "sku": "RNAO70X90X30-XL", "brand": "FAG", "manufacturer_designation": "RNAO70×90×30-XL", "series": "rnao-series", "type": "needle", "d_mm": 70, "D_mm": 90, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 68, "static_load_kN": 135, "fatigue_load_limit_kN": 23.6, "limiting_speed_rpm": 6600, "max_rpm": 6600, "reference_speed_rpm": 4250, "weight_g": 499, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×90×30 mm: 70 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 68 kN and C0 135 kN at the 70 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 90 mm outside diameter the fatigue load limit Cur is 23.6 kN, the limiting speed 6,600 r/min and the thermal reference speed 4,250 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.97 kN/mm and per millimetre of width 2.27 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 499 g, just 0.18 g per mm² of projected 90×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 70 mm bore the 90 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 6,600 r/min With no ribs the rollers can be arranged very freely in the 30 mm width, giving C 68 kN at only 90 mm outside diameter — the most compact radial unit in the HR1 needle section -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 68 kN C rating and longer nominal life come without an envelope change. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 90 mm outside diameter and 68 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 70 mm seat, and in textile machine heald and cam shafts the 499 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 135 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNAO70×90×30-XL?", "a": "The RNAO70×90×30-XL is a RNAO flangeless needle roller bearing without inner ring with 90 mm outside diameter, 70 mm bore and 30 mm width, envelope 70×90×30 mm. Mass is 499 g." }, { "q": "What does the RNAO70×90×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO70×90×30-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×90×30 mm and the catalogue ratings are C 68 kN, C0 135 kN, Cur 23.6 kN." }, { "q": "What is the load capacity of the RNAO70×90×30-XL?", "a": "The basic dynamic load rating C is 68 kN and the basic static load rating C0 is 135 kN; the fatigue load limit Cur is 23.6 kN." }, { "q": "What is the maximum speed of the RNAO70×90×30-XL?", "a": "The limiting speed is 6,600 r/min and the thermal reference speed is 4,250 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO70×90×30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO70×90×30-XL has no inner ring, so the 70 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO70X90X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO70X90X30-XL", "RNAO70×90×30-XL" ], "locale_variants": {} }, { "sku": "RNAO80X100X30-XL", "brand": "FAG", "manufacturer_designation": "RNAO80×100×30-XL", "series": "rnao-series", "type": "needle", "d_mm": 80, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 176, "fatigue_load_limit_kN": 31.5, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3600, "weight_g": 580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×100×30 mm: 80 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 80 kN and C0 176 kN at the 80 mm seat; the C/C0 ratio of 0.45 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 100 mm outside diameter the fatigue load limit Cur is 31.5 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,600 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.00 kN/mm and per millimetre of width 2.67 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 580 g, just 0.19 g per mm² of projected 100×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 80 mm bore the 100 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,800 r/min With no ribs the rollers can be arranged very freely in the 30 mm width, giving C 80 kN at only 100 mm outside diameter — the most compact radial unit in the HR1 needle section Cur 31.5 kN and speeds up to 5,800 r/min suit planetary gears, connecting rods and pump eccentrics where space is dictated by the shaft diameter X-life status (-XL) indicates the current Schaeffler premium execution at 80 mm bore; the 176 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include motorcycle and light-vehicle transmissions, connecting-rod small ends and two-stroke and compressor piston pins, where the 100 mm outside diameter and 80 kN dynamic rating match the duty. In motorcycle and light-vehicle transmissions the unit fits a compact 80 mm seat, and in connecting-rod small ends the 580 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for two-stroke and compressor piston pins, relying on the 30 mm width and the published 176 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO80×100×30-XL?", "a": "The RNAO80×100×30-XL is a RNAO flangeless needle roller bearing without inner ring with 100 mm outside diameter, 80 mm bore and 30 mm width, envelope 80×100×30 mm. Mass is 580 g." }, { "q": "What does the RNAO80×100×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO80×100×30-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×100×30 mm and the catalogue ratings are C 80 kN, C0 176 kN, Cur 31.5 kN." }, { "q": "What is the load capacity of the RNAO80×100×30-XL?", "a": "The basic dynamic load rating C is 80 kN and the basic static load rating C0 is 176 kN; the fatigue load limit Cur is 31.5 kN." }, { "q": "What is the maximum speed of the RNAO80×100×30-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,600 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO80×100×30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO80×100×30-XL has no inner ring, so the 80 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO80X100X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO80X100X30-XL", "RNAO80×100×30-XL" ], "locale_variants": {} }, { "sku": "RNAO90X105X26-XL", "brand": "FAG", "manufacturer_designation": "RNAO90×105×26-XL", "series": "rnao-series", "type": "needle", "d_mm": 90, "D_mm": 105, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 69, "static_load_kN": 150, "fatigue_load_limit_kN": 25.5, "limiting_speed_rpm": 5200, "max_rpm": 5200, "reference_speed_rpm": 3350, "weight_g": 373, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×105×26 mm: 90 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 69 kN and C0 150 kN at the 90 mm seat; the C/C0 ratio of 0.46 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 105 mm outside diameter the fatigue load limit Cur is 25.5 kN, the limiting speed 5,200 r/min and the thermal reference speed 3,350 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.77 kN/mm and per millimetre of width 2.65 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 373 g, just 0.14 g per mm² of projected 105×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 90 mm bore the 105 mm outside diameter and 26 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,200 r/min With no ribs the rollers can be arranged very freely in the 26 mm width, giving C 69 kN at only 105 mm outside diameter — the most compact radial unit in the HR1 needle section At 373 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 25.5 kN Cur value. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 105 mm outside diameter and 69 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 90 mm seat, and in agricultural machine pivots and linkages the 373 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 26 mm width and the published 150 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the RNAO90×105×26-XL?", "a": "The RNAO90×105×26-XL is a RNAO flangeless needle roller bearing without inner ring with 105 mm outside diameter, 90 mm bore and 26 mm width, envelope 90×105×26 mm. Mass is 373 g." }, { "q": "What does the RNAO90×105×26-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO90×105×26-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×105×26 mm and the catalogue ratings are C 69 kN, C0 150 kN, Cur 25.5 kN." }, { "q": "What is the load capacity of the RNAO90×105×26-XL?", "a": "The basic dynamic load rating C is 69 kN and the basic static load rating C0 is 150 kN; the fatigue load limit Cur is 25.5 kN." }, { "q": "What is the maximum speed of the RNAO90×105×26-XL?", "a": "The limiting speed is 5,200 r/min and the thermal reference speed is 3,350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO90×105×26-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO90×105×26-XL has no inner ring, so the 90 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO90X105X26", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO90X105X26-XL", "RNAO90×105×26-XL" ], "locale_variants": {} }, { "sku": "RNAO90X110X30-XL", "brand": "FAG", "manufacturer_designation": "RNAO90×110×30-XL", "series": "rnao-series", "type": "needle", "d_mm": 90, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 172, "fatigue_load_limit_kN": 30, "limiting_speed_rpm": 5200, "max_rpm": 5200, "reference_speed_rpm": 3450, "weight_g": 610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×110×30 mm: 90 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 76 kN and C0 172 kN at the 90 mm seat; the C/C0 ratio of 0.44 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 30 kN, the limiting speed 5,200 r/min and the thermal reference speed 3,450 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.84 kN/mm and per millimetre of width 2.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 610 g, just 0.18 g per mm² of projected 110×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 90 mm bore the 110 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 5,200 r/min The shaft itself is the inner raceway: harden to 58–64 HRC and finish-grind to the catalogue journal tolerance, or the 172 kN static rating cannot be used Reading RNAO: O denotes the ribless (open-sided) race design; the single roller row runs directly between ground shaft and housing bore -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 76 kN C rating and longer nominal life come without an envelope change. Typical applications include small electric motor accessory drives, rocker arms and valve trains and planetary gear bearings, where the 110 mm outside diameter and 76 kN dynamic rating match the duty. In small electric motor accessory drives the unit fits a compact 90 mm seat, and in rocker arms and valve trains the 610 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for planetary gear bearings, relying on the 30 mm width and the published 172 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the RNAO90×110×30-XL?", "a": "The RNAO90×110×30-XL is a RNAO flangeless needle roller bearing without inner ring with 110 mm outside diameter, 90 mm bore and 30 mm width, envelope 90×110×30 mm. Mass is 610 g." }, { "q": "What does the RNAO90×110×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO90×110×30-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×110×30 mm and the catalogue ratings are C 76 kN, C0 172 kN, Cur 30 kN." }, { "q": "What is the load capacity of the RNAO90×110×30-XL?", "a": "The basic dynamic load rating C is 76 kN and the basic static load rating C0 is 172 kN; the fatigue load limit Cur is 30 kN." }, { "q": "What is the maximum speed of the RNAO90×110×30-XL?", "a": "The limiting speed is 5,200 r/min and the thermal reference speed is 3,450 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO90×110×30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO90×110×30-XL has no inner ring, so the 90 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO90X110X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO90X110X30-XL", "RNAO90×110×30-XL" ], "locale_variants": {} }, { "sku": "RNAO100X120X30-XL", "brand": "FAG", "manufacturer_designation": "RNAO100×120×30-XL", "series": "rnao-series", "type": "needle", "d_mm": 100, "D_mm": 120, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 188, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 4700, "max_rpm": 4700, "reference_speed_rpm": 3150, "weight_g": 694, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 100×120×30 mm: 100 mm seat is the hardened and ground shaft journal itself — there is no inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 80 kN and C0 188 kN at the 100 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 32.5 kN, the limiting speed 4,700 r/min and the thermal reference speed 3,150 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.80 kN/mm and per millimetre of width 2.67 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 694 g, just 0.19 g per mm² of projected 120×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 100 mm bore the 120 mm outside diameter and 30 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,700 r/min At 694 g the assembly is easy to drop into a connecting-rod eye, but without ribs even a small axial offset skews the needles — end float must be controlled by the surrounding parts RNAO marks the flangeless needle bearing without inner ring: neither race carries ribs, so the 100 mm hardened shaft journal and the housing faces provide all axial guidance X-life status (-XL) indicates the current Schaeffler premium execution at 100 mm bore; the 188 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 120 mm outside diameter and 80 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 100 mm seat, and in gearbox selector and change linkages the 694 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 30 mm width and the published 188 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the RNAO100×120×30-XL?", "a": "The RNAO100×120×30-XL is a RNAO flangeless needle roller bearing without inner ring with 120 mm outside diameter, 100 mm bore and 30 mm width, envelope 100×120×30 mm. Mass is 694 g." }, { "q": "What does the RNAO100×120×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "RNAO100×120×30-XL identifies this RNAO flangeless needle roller bearing without inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 100×120×30 mm and the catalogue ratings are C 80 kN, C0 188 kN, Cur 32.5 kN." }, { "q": "What is the load capacity of the RNAO100×120×30-XL?", "a": "The basic dynamic load rating C is 80 kN and the basic static load rating C0 is 188 kN; the fatigue load limit Cur is 32.5 kN." }, { "q": "What is the maximum speed of the RNAO100×120×30-XL?", "a": "The limiting speed is 4,700 r/min and the thermal reference speed is 3,150 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "Can the RNAO100×120×30-XL run directly on an ordinary shaft?", "a": "Not on a soft shaft. The RNAO100×120×30-XL has no inner ring, so the 100 mm journal itself is the raceway: harden it to 58–64 HRC and finish-grind to the catalogue journal tolerance. Where the shaft cannot be hardened, use the corresponding with-inner-ring execution instead." } ], "cross_ref": [ { "equiv_sku": "RNAO100X120X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=969", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNAO100X120X30-XL", "RNAO100×120×30-XL" ], "locale_variants": {} }, { "sku": "NAO6X17X10-TV-IS1-XL", "brand": "FAG", "manufacturer_designation": "NAO6×17×10-TV-IS1-XL", "series": "nao-series", "type": "needle", "d_mm": 6, "D_mm": 17, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 5.3, "static_load_kN": 5.5, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 29500, "max_rpm": 29500, "reference_speed_rpm": 23800, "weight_g": 14, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×17×10 mm: 6 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 5.5 mm radial section packed with small-diameter needle rollers C is 5.3 kN and C0 5.5 kN at the 6 mm seat; the C/C0 ratio of 0.96 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 17 mm outside diameter the fatigue load limit Cur is 0.94 kN, the limiting speed 29,500 r/min and the thermal reference speed 23,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 0.53 kN/mm — the reason 10 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 14 g, just 0.08 g per mm² of projected 17×10 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 6 mm bore this is one of the smallest HR1 executions — chosen where a 17 mm envelope must carry line-contact loads that no miniature ball bearing could take The single needle row fills the thin section, with limiting speed 29,500 r/min and reference speed 23,800 r/min With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 5.5 kN and Cur 0.94 kN for the 14 g unit The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 6×17×10 mm envelope. The -TV cage is part of the speed story here: cage-guided kinematics permit the published 29,500 r/min limiting speed without roller-to-roller sliding. The IS1 groove keeps the flangeless races lubricable from the shaft side despite the compact 5.5 mm section. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 17 mm outside diameter and 5.3 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 6 mm seat, and in gearbox selector and change linkages the 14 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 10 mm width and the published 5.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NAO6×17×10-TV-IS1-XL?", "a": "The NAO6×17×10-TV-IS1-XL is a NAO flangeless needle roller bearing with inner ring with 17 mm outside diameter, 6 mm bore and 10 mm width, envelope 6×17×10 mm. Mass is 14 g." }, { "q": "What does the NAO6×17×10-TV-IS1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO6×17×10-TV-IS1-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 6×17×10 mm and the catalogue ratings are C 5.3 kN, C0 5.5 kN, Cur 0.94 kN." }, { "q": "What is the load capacity of the NAO6×17×10-TV-IS1-XL?", "a": "The basic dynamic load rating C is 5.3 kN and the basic static load rating C0 is 5.5 kN; the fatigue load limit Cur is 0.94 kN." }, { "q": "What is the maximum speed of the NAO6×17×10-TV-IS1-XL?", "a": "The limiting speed is 29,500 r/min and the thermal reference speed is 23,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO6×17×10-TV-IS1-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 6 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO6X17X10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO6X17X10-TV-IS1-XL", "NAO6×17×10-TV-IS1-XL" ], "locale_variants": {} }, { "sku": "NAO9X22X12-TV-XL", "brand": "FAG", "manufacturer_designation": "NAO9×22×12-TV-XL", "series": "nao-series", "type": "needle", "d_mm": 9, "D_mm": 22, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 11.3, "static_load_kN": 9.9, "fatigue_load_limit_kN": 1.77, "limiting_speed_rpm": 26000, "max_rpm": 26000, "reference_speed_rpm": 17900, "weight_g": 23.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 9×22×12 mm: 9 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 11.3 kN and C0 9.9 kN at the 9 mm seat; the C/C0 ratio of 1.14 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 22 mm outside diameter the fatigue load limit Cur is 1.77 kN, the limiting speed 26,000 r/min and the thermal reference speed 17,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.26 kN/mm and per millimetre of width 0.94 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 23.5 g, just 0.09 g per mm² of projected 22×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 9 mm bore this is one of the smallest HR1 executions — chosen where a 22 mm envelope must carry line-contact loads that no miniature ball bearing could take Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges The inner ring gives a 9 mm plain bore inside the 22×12 mm envelope and the flangeless pack delivers C 11.3 kN — a frequent choice in gear change linkages and pumps The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 26,000 r/min limit. -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 22 mm outside diameter and 11.3 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 9 mm seat, and in agricultural machine pivots and linkages the 23.5 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 12 mm width and the published 9.9 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NAO9×22×12-TV-XL?", "a": "The NAO9×22×12-TV-XL is a NAO flangeless needle roller bearing with inner ring with 22 mm outside diameter, 9 mm bore and 12 mm width, envelope 9×22×12 mm. Mass is 23.5 g." }, { "q": "What does the NAO9×22×12-TV-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO9×22×12-TV-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 9×22×12 mm and the catalogue ratings are C 11.3 kN, C0 9.9 kN, Cur 1.77 kN." }, { "q": "What is the load capacity of the NAO9×22×12-TV-XL?", "a": "The basic dynamic load rating C is 11.3 kN and the basic static load rating C0 is 9.9 kN; the fatigue load limit Cur is 1.77 kN." }, { "q": "What is the maximum speed of the NAO9×22×12-TV-XL?", "a": "The limiting speed is 26,000 r/min and the thermal reference speed is 17,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO9×22×12-TV-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 9 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO9X22X12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO9X22X12-TV-XL", "NAO9×22×12-TV-XL" ], "locale_variants": {} }, { "sku": "NAO12X24X13-XL", "brand": "FAG", "manufacturer_designation": "NAO12×24×13-XL", "series": "nao-series", "type": "needle", "d_mm": 12, "D_mm": 24, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.1, "static_load_kN": 11.8, "fatigue_load_limit_kN": 1.93, "limiting_speed_rpm": 23600, "max_rpm": 23600, "reference_speed_rpm": 15000, "weight_g": 30, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×24×13 mm: 12 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.0 mm radial section packed with small-diameter needle rollers C is 10.1 kN and C0 11.8 kN at the 12 mm seat; the C/C0 ratio of 0.86 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 24 mm outside diameter the fatigue load limit Cur is 1.93 kN, the limiting speed 23,600 r/min and the thermal reference speed 15,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.84 kN/mm and per millimetre of width 0.78 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 30 g, just 0.10 g per mm² of projected 24×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 12 mm bore this is one of the smallest HR1 executions — chosen where a 24 mm envelope must carry line-contact loads that no miniature ball bearing could take Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 6.0 mm section is too thin to compensate for tilted seats With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 11.8 kN and Cur 1.93 kN for the 30 g unit The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 23,600 r/min limit. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 24 mm outside diameter and 10.1 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 12 mm seat, and in two-stroke and compressor piston pins the 30 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 13 mm width and the published 11.8 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NAO12×24×13-XL?", "a": "The NAO12×24×13-XL is a NAO flangeless needle roller bearing with inner ring with 24 mm outside diameter, 12 mm bore and 13 mm width, envelope 12×24×13 mm. Mass is 30 g." }, { "q": "What does the NAO12×24×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO12×24×13-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×24×13 mm and the catalogue ratings are C 10.1 kN, C0 11.8 kN, Cur 1.93 kN." }, { "q": "What is the load capacity of the NAO12×24×13-XL?", "a": "The basic dynamic load rating C is 10.1 kN and the basic static load rating C0 is 11.8 kN; the fatigue load limit Cur is 1.93 kN." }, { "q": "What is the maximum speed of the NAO12×24×13-XL?", "a": "The limiting speed is 23,600 r/min and the thermal reference speed is 15,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO12×24×13-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 12 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO12X24X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO12X24X13-XL", "NAO12×24×13-XL" ], "locale_variants": {} }, { "sku": "NAO12X28X12-IS1-XL", "brand": "FAG", "manufacturer_designation": "NAO12×28×12-IS1-XL", "series": "nao-series", "type": "needle", "d_mm": 12, "D_mm": 28, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13, "static_load_kN": 12.5, "fatigue_load_limit_kN": 2.25, "limiting_speed_rpm": 22900, "max_rpm": 22900, "reference_speed_rpm": 14300, "weight_g": 40, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×28×12 mm: 12 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.0 mm radial section packed with small-diameter needle rollers C is 13 kN and C0 12.5 kN at the 12 mm seat; the C/C0 ratio of 1.04 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.25 kN, the limiting speed 22,900 r/min and the thermal reference speed 14,300 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.08 kN/mm and per millimetre of width 1.08 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 40 g, just 0.12 g per mm² of projected 28×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 12 mm bore and only 40 g: the smallest sizes demand accurate shaft geometry, because the 8.0 mm section leaves no tolerance for a soft or tapered seat The single needle row fills the thin section, with limiting speed 22,900 r/min and reference speed 14,300 r/min X-life status (-XL) indicates the current Schaeffler premium execution at 12 mm bore; the 12.5 kN C0 rating reflects the improved rolling-contact geometry. -IS1 is the inner-ring lube option; it changes nothing in the 12×28×12 mm envelope but requires a matching oilway in the shaft. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 28 mm outside diameter and 13 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 12 mm seat, and in two-stroke and compressor piston pins the 40 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 12 mm width and the published 12.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "copying and printing machine mechanisms", "rocker arms and valve trains", "hydraulic and pneumatic pump eccentrics", "agricultural machine pivots and linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NAO12×28×12-IS1-XL?", "a": "The NAO12×28×12-IS1-XL is a NAO flangeless needle roller bearing with inner ring with 28 mm outside diameter, 12 mm bore and 12 mm width, envelope 12×28×12 mm. Mass is 40 g." }, { "q": "What does the NAO12×28×12-IS1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO12×28×12-IS1-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 12×28×12 mm and the catalogue ratings are C 13 kN, C0 12.5 kN, Cur 2.25 kN." }, { "q": "What is the load capacity of the NAO12×28×12-IS1-XL?", "a": "The basic dynamic load rating C is 13 kN and the basic static load rating C0 is 12.5 kN; the fatigue load limit Cur is 2.25 kN." }, { "q": "What is the maximum speed of the NAO12×28×12-IS1-XL?", "a": "The limiting speed is 22,900 r/min and the thermal reference speed is 14,300 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO12×28×12-IS1-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 12 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO12X28X12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO12X28X12-IS1-XL", "NAO12×28×12-IS1-XL" ], "locale_variants": {} }, { "sku": "NAO15X28X13-XL", "brand": "FAG", "manufacturer_designation": "NAO15×28×13-XL", "series": "nao-series", "type": "needle", "d_mm": 15, "D_mm": 28, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.1, "static_load_kN": 14.3, "fatigue_load_limit_kN": 2.35, "limiting_speed_rpm": 21300, "max_rpm": 21300, "reference_speed_rpm": 12100, "weight_g": 29, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×28×13 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 11.1 kN and C0 14.3 kN at the 15 mm seat; the C/C0 ratio of 0.78 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 28 mm outside diameter the fatigue load limit Cur is 2.35 kN, the limiting speed 21,300 r/min and the thermal reference speed 12,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.74 kN/mm and per millimetre of width 0.85 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 29 g, just 0.08 g per mm² of projected 28×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 15 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading NAO: the O-suffix race design has no integral ribs on either ring, so the bearing can be separated and the outer assembly swivelled into split housings during mounting With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 14.3 kN and Cur 2.35 kN for the 29 g unit The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 21,300 r/min limit. Typical applications include agricultural machine pivots and linkages, hydraulic and pneumatic pump eccentrics and textile machine heald and cam shafts, where the 28 mm outside diameter and 11.1 kN dynamic rating match the duty. In agricultural machine pivots and linkages the unit fits a compact 15 mm seat, and in hydraulic and pneumatic pump eccentrics the 29 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for textile machine heald and cam shafts, relying on the 13 mm width and the published 14.3 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NAO15×28×13-XL?", "a": "The NAO15×28×13-XL is a NAO flangeless needle roller bearing with inner ring with 28 mm outside diameter, 15 mm bore and 13 mm width, envelope 15×28×13 mm. Mass is 29 g." }, { "q": "What does the NAO15×28×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO15×28×13-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×28×13 mm and the catalogue ratings are C 11.1 kN, C0 14.3 kN, Cur 2.35 kN." }, { "q": "What is the load capacity of the NAO15×28×13-XL?", "a": "The basic dynamic load rating C is 11.1 kN and the basic static load rating C0 is 14.3 kN; the fatigue load limit Cur is 2.35 kN." }, { "q": "What is the maximum speed of the NAO15×28×13-XL?", "a": "The limiting speed is 21,300 r/min and the thermal reference speed is 12,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO15×28×13-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 15 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO15X28X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO15X28X13-XL", "NAO15×28×13-XL" ], "locale_variants": {} }, { "sku": "NAO15X32X12-IS1-XL", "brand": "FAG", "manufacturer_designation": "NAO15×32×12-IS1-XL", "series": "nao-series", "type": "needle", "d_mm": 15, "D_mm": 32, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.1, "static_load_kN": 16.2, "fatigue_load_limit_kN": 2.9, "limiting_speed_rpm": 20900, "max_rpm": 20900, "reference_speed_rpm": 11400, "weight_g": 50, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×32×12 mm: 15 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 15.1 kN and C0 16.2 kN at the 15 mm seat; the C/C0 ratio of 0.93 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 32 mm outside diameter the fatigue load limit Cur is 2.9 kN, the limiting speed 20,900 r/min and the thermal reference speed 11,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.01 kN/mm and per millimetre of width 1.26 kN/mm — the reason 12 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 50 g, just 0.13 g per mm² of projected 32×12 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 15 mm bore the 12 mm width and 15.1 kN C rating suit high-cycle industrial machinery rather than instrument duty With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 16.2 kN and Cur 2.9 kN for the 50 g unit As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 2.9 kN Cur value. -IS1 marks the inner-ring lubrication feature: grease reaches the needle pack via the groove machined around the inner ring of the NAO15×32×12-IS1-XL. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 32 mm outside diameter and 15.1 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 15 mm seat, and in small electric motor accessory drives the 50 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 12 mm width and the published 16.2 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NAO15×32×12-IS1-XL?", "a": "The NAO15×32×12-IS1-XL is a NAO flangeless needle roller bearing with inner ring with 32 mm outside diameter, 15 mm bore and 12 mm width, envelope 15×32×12 mm. Mass is 50 g." }, { "q": "What does the NAO15×32×12-IS1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO15×32×12-IS1-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×32×12 mm and the catalogue ratings are C 15.1 kN, C0 16.2 kN, Cur 2.9 kN." }, { "q": "What is the load capacity of the NAO15×32×12-IS1-XL?", "a": "The basic dynamic load rating C is 15.1 kN and the basic static load rating C0 is 16.2 kN; the fatigue load limit Cur is 2.9 kN." }, { "q": "What is the maximum speed of the NAO15×32×12-IS1-XL?", "a": "The limiting speed is 20,900 r/min and the thermal reference speed is 11,400 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO15×32×12-IS1-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 15 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO15X32X12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO15X32X12-IS1-XL", "NAO15×32×12-IS1-XL" ], "locale_variants": {} }, { "sku": "NAO17X30X13-XL", "brand": "FAG", "manufacturer_designation": "NAO17×30×13-XL", "series": "nao-series", "type": "needle", "d_mm": 17, "D_mm": 30, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.8, "static_load_kN": 15.9, "fatigue_load_limit_kN": 2.6, "limiting_speed_rpm": 20400, "max_rpm": 20400, "reference_speed_rpm": 11100, "weight_g": 42, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×30×13 mm: 17 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 6.5 mm radial section packed with small-diameter needle rollers C is 11.8 kN and C0 15.9 kN at the 17 mm seat; the C/C0 ratio of 0.74 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 30 mm outside diameter the fatigue load limit Cur is 2.6 kN, the limiting speed 20,400 r/min and the thermal reference speed 11,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.69 kN/mm and per millimetre of width 0.91 kN/mm — the reason 13 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 42 g, just 0.11 g per mm² of projected 30×13 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 17 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The inner ring gives a 17 mm plain bore inside the 30×13 mm envelope and the flangeless pack delivers C 11.8 kN — a frequent choice in gear change linkages and pumps Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 6.5 mm section is too thin to compensate for tilted seats The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 20,400 r/min limit. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 30 mm outside diameter and 11.8 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 17 mm seat, and in gearbox selector and change linkages the 42 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 13 mm width and the published 15.9 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NAO17×30×13-XL?", "a": "The NAO17×30×13-XL is a NAO flangeless needle roller bearing with inner ring with 30 mm outside diameter, 17 mm bore and 13 mm width, envelope 17×30×13 mm. Mass is 42 g." }, { "q": "What does the NAO17×30×13-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO17×30×13-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×30×13 mm and the catalogue ratings are C 11.8 kN, C0 15.9 kN, Cur 2.6 kN." }, { "q": "What is the load capacity of the NAO17×30×13-XL?", "a": "The basic dynamic load rating C is 11.8 kN and the basic static load rating C0 is 15.9 kN; the fatigue load limit Cur is 2.6 kN." }, { "q": "What is the maximum speed of the NAO17×30×13-XL?", "a": "The limiting speed is 20,400 r/min and the thermal reference speed is 11,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO17×30×13-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 17 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO17X30X13", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO17X30X13-XL", "NAO17×30×13-XL" ], "locale_variants": {} }, { "sku": "NAO17X35X16-XL", "brand": "FAG", "manufacturer_designation": "NAO17×35×16-XL", "series": "nao-series", "type": "needle", "d_mm": 17, "D_mm": 35, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.6, "static_load_kN": 25.5, "fatigue_load_limit_kN": 4.25, "limiting_speed_rpm": 19200, "max_rpm": 19200, "reference_speed_rpm": 10100, "weight_g": 78, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×35×16 mm: 17 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 22.6 kN and C0 25.5 kN at the 17 mm seat; the C/C0 ratio of 0.89 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 4.25 kN, the limiting speed 19,200 r/min and the thermal reference speed 10,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.33 kN/mm and per millimetre of width 1.41 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 78 g, just 0.14 g per mm² of projected 35×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 17 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 9.0 mm section is too thin to compensate for tilted seats The single needle row fills the thin section, with limiting speed 19,200 r/min and reference speed 10,100 r/min The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 19,200 r/min limit. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 35 mm outside diameter and 22.6 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 17 mm seat, and in copying and printing machine mechanisms the 78 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 16 mm width and the published 25.5 kN static rating. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "textile machine heald and cam shafts", "gearbox selector and change linkages", "connecting-rod small ends", "motorcycle and light-vehicle transmissions" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NAO17×35×16-XL?", "a": "The NAO17×35×16-XL is a NAO flangeless needle roller bearing with inner ring with 35 mm outside diameter, 17 mm bore and 16 mm width, envelope 17×35×16 mm. Mass is 78 g." }, { "q": "What does the NAO17×35×16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO17×35×16-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×35×16 mm and the catalogue ratings are C 22.6 kN, C0 25.5 kN, Cur 4.25 kN." }, { "q": "What is the load capacity of the NAO17×35×16-XL?", "a": "The basic dynamic load rating C is 22.6 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 4.25 kN." }, { "q": "What is the maximum speed of the NAO17×35×16-XL?", "a": "The limiting speed is 19,200 r/min and the thermal reference speed is 10,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO17×35×16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 17 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO17X35X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO17X35X16-XL", "NAO17×35×16-XL" ], "locale_variants": {} }, { "sku": "NAO20X35X17-XL", "brand": "FAG", "manufacturer_designation": "NAO20×35×17-XL", "series": "nao-series", "type": "needle", "d_mm": 20, "D_mm": 35, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.8, "static_load_kN": 26, "fatigue_load_limit_kN": 4.3, "limiting_speed_rpm": 18100, "max_rpm": 18100, "reference_speed_rpm": 10000, "weight_g": 76, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×35×17 mm: 20 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 16.8 kN and C0 26 kN at the 20 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 35 mm outside diameter the fatigue load limit Cur is 4.3 kN, the limiting speed 18,100 r/min and the thermal reference speed 10,000 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.84 kN/mm and per millimetre of width 0.99 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 76 g, just 0.13 g per mm² of projected 35×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 17 mm width and 16.8 kN C rating suit high-cycle industrial machinery rather than instrument duty Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 7.5 mm section is too thin to compensate for tilted seats X-life status (-XL) indicates the current Schaeffler premium execution at 20 mm bore; the 26 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 35 mm outside diameter and 16.8 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 20 mm seat, and in copying and printing machine mechanisms the 76 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 17 mm width and the published 26 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NAO20×35×17-XL?", "a": "The NAO20×35×17-XL is a NAO flangeless needle roller bearing with inner ring with 35 mm outside diameter, 20 mm bore and 17 mm width, envelope 20×35×17 mm. Mass is 76 g." }, { "q": "What does the NAO20×35×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO20×35×17-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×35×17 mm and the catalogue ratings are C 16.8 kN, C0 26 kN, Cur 4.3 kN." }, { "q": "What is the load capacity of the NAO20×35×17-XL?", "a": "The basic dynamic load rating C is 16.8 kN and the basic static load rating C0 is 26 kN; the fatigue load limit Cur is 4.3 kN." }, { "q": "What is the maximum speed of the NAO20×35×17-XL?", "a": "The limiting speed is 18,100 r/min and the thermal reference speed is 10,000 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO20×35×17-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 20 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO20X35X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO20X35X17-XL", "NAO20×35×17-XL" ], "locale_variants": {} }, { "sku": "NAO20X37X16-XL", "brand": "FAG", "manufacturer_designation": "NAO20×37×16-XL", "series": "nao-series", "type": "needle", "d_mm": 20, "D_mm": 37, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.5, "static_load_kN": 27.5, "fatigue_load_limit_kN": 4.65, "limiting_speed_rpm": 17200, "max_rpm": 17200, "reference_speed_rpm": 9100, "weight_g": 82, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×37×16 mm: 20 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 23.5 kN and C0 27.5 kN at the 20 mm seat; the C/C0 ratio of 0.85 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 37 mm outside diameter the fatigue load limit Cur is 4.65 kN, the limiting speed 17,200 r/min and the thermal reference speed 9,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.18 kN/mm and per millimetre of width 1.47 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 82 g, just 0.14 g per mm² of projected 37×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 20 mm bore the 16 mm width and 23.5 kN C rating suit high-cycle industrial machinery rather than instrument duty The single needle row fills the thin section, with limiting speed 17,200 r/min and reference speed 9,100 r/min With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 27.5 kN and Cur 4.65 kN for the 82 g unit The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 17,200 r/min limit. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 37 mm outside diameter and 23.5 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 20 mm seat, and in agricultural machine pivots and linkages the 82 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for connecting-rod small ends, relying on the 16 mm width and the published 27.5 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "small electric motor accessory drives", "connecting-rod small ends", "planetary gear bearings", "gearbox selector and change linkages" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NAO20×37×16-XL?", "a": "The NAO20×37×16-XL is a NAO flangeless needle roller bearing with inner ring with 37 mm outside diameter, 20 mm bore and 16 mm width, envelope 20×37×16 mm. Mass is 82 g." }, { "q": "What does the NAO20×37×16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO20×37×16-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×37×16 mm and the catalogue ratings are C 23.5 kN, C0 27.5 kN, Cur 4.65 kN." }, { "q": "What is the load capacity of the NAO20×37×16-XL?", "a": "The basic dynamic load rating C is 23.5 kN and the basic static load rating C0 is 27.5 kN; the fatigue load limit Cur is 4.65 kN." }, { "q": "What is the maximum speed of the NAO20×37×16-XL?", "a": "The limiting speed is 17,200 r/min and the thermal reference speed is 9,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO20×37×16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 20 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO20X37X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO20X37X16-XL", "NAO20×37×16-XL" ], "locale_variants": {} }, { "sku": "NAO25X40X17-XL", "brand": "FAG", "manufacturer_designation": "NAO25×40×17-XL", "series": "nao-series", "type": "needle", "d_mm": 25, "D_mm": 40, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 22.1, "static_load_kN": 34, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 15100, "max_rpm": 15100, "reference_speed_rpm": 8100, "weight_g": 88, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×40×17 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 22.1 kN and C0 34 kN at the 25 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 40 mm outside diameter the fatigue load limit Cur is 5.4 kN, the limiting speed 15,100 r/min and the thermal reference speed 8,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.88 kN/mm and per millimetre of width 1.30 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 88 g, just 0.13 g per mm² of projected 40×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges The single needle row fills the thin section, with limiting speed 15,100 r/min and reference speed 8,100 r/min X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 34 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include rocker arms and valve trains, two-stroke and compressor piston pins and small electric motor accessory drives, where the 40 mm outside diameter and 22.1 kN dynamic rating match the duty. In rocker arms and valve trains the unit fits a compact 25 mm seat, and in two-stroke and compressor piston pins the 88 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for small electric motor accessory drives, relying on the 17 mm width and the published 34 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "agricultural machine pivots and linkages", "planetary gear bearings", "textile machine heald and cam shafts", "connecting-rod small ends" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NAO25×40×17-XL?", "a": "The NAO25×40×17-XL is a NAO flangeless needle roller bearing with inner ring with 40 mm outside diameter, 25 mm bore and 17 mm width, envelope 25×40×17 mm. Mass is 88 g." }, { "q": "What does the NAO25×40×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO25×40×17-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×40×17 mm and the catalogue ratings are C 22.1 kN, C0 34 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NAO25×40×17-XL?", "a": "The basic dynamic load rating C is 22.1 kN and the basic static load rating C0 is 34 kN; the fatigue load limit Cur is 5.4 kN." }, { "q": "What is the maximum speed of the NAO25×40×17-XL?", "a": "The limiting speed is 15,100 r/min and the thermal reference speed is 8,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO25×40×17-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO25X40X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO25X40X17-XL", "NAO25×40×17-XL" ], "locale_variants": {} }, { "sku": "NAO25X42X16-IS1-XL", "brand": "FAG", "manufacturer_designation": "NAO25×42×16-IS1-XL", "series": "nao-series", "type": "needle", "d_mm": 25, "D_mm": 42, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 33.5, "fatigue_load_limit_kN": 5.6, "limiting_speed_rpm": 14600, "max_rpm": 14600, "reference_speed_rpm": 7800, "weight_g": 86, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×42×16 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 26 kN and C0 33.5 kN at the 25 mm seat; the C/C0 ratio of 0.78 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 5.6 kN, the limiting speed 14,600 r/min and the thermal reference speed 7,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.04 kN/mm and per millimetre of width 1.63 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 86 g, just 0.13 g per mm² of projected 42×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The single needle row fills the thin section, with limiting speed 14,600 r/min and reference speed 7,800 r/min Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 8.5 mm section is too thin to compensate for tilted seats -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 26 kN C rating and longer nominal life come without an envelope change. The IS1 groove keeps the flangeless races lubricable from the shaft side despite the compact 8.5 mm section. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 42 mm outside diameter and 26 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 25 mm seat, and in copying and printing machine mechanisms the 86 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 16 mm width and the published 33.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NAO25×42×16-IS1-XL?", "a": "The NAO25×42×16-IS1-XL is a NAO flangeless needle roller bearing with inner ring with 42 mm outside diameter, 25 mm bore and 16 mm width, envelope 25×42×16 mm. Mass is 86 g." }, { "q": "What does the NAO25×42×16-IS1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO25×42×16-IS1-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×42×16 mm and the catalogue ratings are C 26 kN, C0 33.5 kN, Cur 5.6 kN." }, { "q": "What is the load capacity of the NAO25×42×16-IS1-XL?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 5.6 kN." }, { "q": "What is the maximum speed of the NAO25×42×16-IS1-XL?", "a": "The limiting speed is 14,600 r/min and the thermal reference speed is 7,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO25×42×16-IS1-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO25X42X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO25X42X16-IS1-XL", "NAO25×42×16-IS1-XL" ], "locale_variants": {} }, { "sku": "NAO25X42X32-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "NAO25×42×32-ZW-ASR1-XL", "series": "nao-series", "type": "needle", "d_mm": 25, "D_mm": 42, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 45, "static_load_kN": 67, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 14600, "max_rpm": 14600, "reference_speed_rpm": 7800, "weight_g": 190, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×42×32 mm: 25 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 45 kN and C0 67 kN at the 25 mm seat; the C/C0 ratio of 0.67 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 42 mm outside diameter the fatigue load limit Cur is 11.3 kN, the limiting speed 14,600 r/min and the thermal reference speed 7,800 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.80 kN/mm and per millimetre of width 1.41 kN/mm — the reason 32 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 190 g, just 0.14 g per mm² of projected 42×32 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 25 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The inner ring gives a 25 mm plain bore inside the 42×32 mm envelope and the flangeless pack delivers C 45 kN — a frequent choice in gear change linkages and pumps With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 67 kN and Cur 11.3 kN for the 190 g unit X-life status (-XL) indicates the current Schaeffler premium execution at 25 mm bore; the 67 kN C0 rating reflects the improved rolling-contact geometry. The -ZW suffix denotes a double-row (zweireihig) needle roller and cage assembly: two roller rows share the 32 mm-wide envelope for higher capacity at the same bore. The ASR groove is particularly useful on double-row -ZW executions, feeding both rows evenly across the 42 mm outer ring. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 42 mm outside diameter and 45 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 25 mm seat, and in motorcycle and light-vehicle transmissions the 190 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 32 mm width and the published 67 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "two-stroke and compressor piston pins", "agricultural machine pivots and linkages", "rocker arms and valve trains", "small electric motor accessory drives" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NAO25×42×32-ZW-ASR1-XL?", "a": "The NAO25×42×32-ZW-ASR1-XL is a NAO flangeless needle roller bearing with inner ring with 42 mm outside diameter, 25 mm bore and 32 mm width, envelope 25×42×32 mm. Mass is 190 g." }, { "q": "What does the NAO25×42×32-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO25×42×32-ZW-ASR1-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×42×32 mm and the catalogue ratings are C 45 kN, C0 67 kN, Cur 11.3 kN." }, { "q": "What is the load capacity of the NAO25×42×32-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 45 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 11.3 kN." }, { "q": "What is the maximum speed of the NAO25×42×32-ZW-ASR1-XL?", "a": "The limiting speed is 14,600 r/min and the thermal reference speed is 7,800 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO25×42×32-ZW-ASR1-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 25 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO25X42X32", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO25X42X32-ZW-ASR1-XL", "NAO25×42×32-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "NAO30X45X17-XL", "brand": "FAG", "manufacturer_designation": "NAO30×45×17-XL", "series": "nao-series", "type": "needle", "d_mm": 30, "D_mm": 45, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.5, "static_load_kN": 38.5, "fatigue_load_limit_kN": 6.2, "limiting_speed_rpm": 13100, "max_rpm": 13100, "reference_speed_rpm": 7100, "weight_g": 102, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×45×17 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 23.5 kN and C0 38.5 kN at the 30 mm seat; the C/C0 ratio of 0.61 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 6.2 kN, the limiting speed 13,100 r/min and the thermal reference speed 7,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.78 kN/mm and per millimetre of width 1.38 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 102 g, just 0.13 g per mm² of projected 45×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 30 mm bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 38.5 kN and Cur 6.2 kN for the 102 g unit Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 6.2 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 45 mm outside diameter and 23.5 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 30 mm seat, and in small electric motor accessory drives the 102 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 17 mm width and the published 38.5 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "gearbox selector and change linkages", "two-stroke and compressor piston pins", "copying and printing machine mechanisms", "hydraulic and pneumatic pump eccentrics" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone." ], "faq": [ { "q": "What are the dimensions of the NAO30×45×17-XL?", "a": "The NAO30×45×17-XL is a NAO flangeless needle roller bearing with inner ring with 45 mm outside diameter, 30 mm bore and 17 mm width, envelope 30×45×17 mm. Mass is 102 g." }, { "q": "What does the NAO30×45×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO30×45×17-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×45×17 mm and the catalogue ratings are C 23.5 kN, C0 38.5 kN, Cur 6.2 kN." }, { "q": "What is the load capacity of the NAO30×45×17-XL?", "a": "The basic dynamic load rating C is 23.5 kN and the basic static load rating C0 is 38.5 kN; the fatigue load limit Cur is 6.2 kN." }, { "q": "What is the maximum speed of the NAO30×45×17-XL?", "a": "The limiting speed is 13,100 r/min and the thermal reference speed is 7,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO30×45×17-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO30X45X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO30X45X17-XL", "NAO30×45×17-XL" ], "locale_variants": {} }, { "sku": "NAO30X45X26-ZW-ASR1-XL", "brand": "FAG", "manufacturer_designation": "NAO30×45×26-ZW-ASR1-XL", "series": "nao-series", "type": "needle", "d_mm": 30, "D_mm": 45, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31.5, "static_load_kN": 56, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 13100, "max_rpm": 13100, "reference_speed_rpm": 7200, "weight_g": 157, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×45×26 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 31.5 kN and C0 56 kN at the 30 mm seat; the C/C0 ratio of 0.56 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 45 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 13,100 r/min and the thermal reference speed 7,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.05 kN/mm and per millimetre of width 1.21 kN/mm — the reason 26 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 157 g, just 0.13 g per mm² of projected 45×26 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 26 mm width and 31.5 kN C rating suit high-cycle industrial machinery rather than instrument duty With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 56 kN and Cur 9.1 kN for the 157 g unit Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 7.5 mm section is too thin to compensate for tilted seats As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 9.1 kN Cur value. -ZW is the double-row needle-cage code; the two rows run on the same races and keep the unit separable and interchangeable with the single-row mounting space. Reading -ASR1: outer-ring groove plus lube holes — housing-fed relubrication for the 31.5 kN C bearing without dismounting. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 45 mm outside diameter and 31.5 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 30 mm seat, and in motorcycle and light-vehicle transmissions the 157 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for rocker arms and valve trains, relying on the 26 mm width and the published 56 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NAO30×45×26-ZW-ASR1-XL?", "a": "The NAO30×45×26-ZW-ASR1-XL is a NAO flangeless needle roller bearing with inner ring with 45 mm outside diameter, 30 mm bore and 26 mm width, envelope 30×45×26 mm. Mass is 157 g." }, { "q": "What does the NAO30×45×26-ZW-ASR1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO30×45×26-ZW-ASR1-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×45×26 mm and the catalogue ratings are C 31.5 kN, C0 56 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the NAO30×45×26-ZW-ASR1-XL?", "a": "The basic dynamic load rating C is 31.5 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the NAO30×45×26-ZW-ASR1-XL?", "a": "The limiting speed is 13,100 r/min and the thermal reference speed is 7,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO30×45×26-ZW-ASR1-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO30X45X26", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO30X45X26-ZW-ASR1-XL", "NAO30×45×26-ZW-ASR1-XL" ], "locale_variants": {} }, { "sku": "NAO30X47X16-XL", "brand": "FAG", "manufacturer_designation": "NAO30×47×16-XL", "series": "nao-series", "type": "needle", "d_mm": 30, "D_mm": 47, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 27.5, "static_load_kN": 37.5, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 12700, "max_rpm": 12700, "reference_speed_rpm": 6900, "weight_g": 109, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×47×16 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 27.5 kN and C0 37.5 kN at the 30 mm seat; the C/C0 ratio of 0.73 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 6.3 kN, the limiting speed 12,700 r/min and the thermal reference speed 6,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.92 kN/mm and per millimetre of width 1.72 kN/mm — the reason 16 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 109 g, just 0.14 g per mm² of projected 47×16 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 16 mm width and 27.5 kN C rating suit high-cycle industrial machinery rather than instrument duty With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 37.5 kN and Cur 6.3 kN for the 109 g unit X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 37.5 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 47 mm outside diameter and 27.5 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 30 mm seat, and in planetary gear bearings the 109 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 16 mm width and the published 37.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting." ], "faq": [ { "q": "What are the dimensions of the NAO30×47×16-XL?", "a": "The NAO30×47×16-XL is a NAO flangeless needle roller bearing with inner ring with 47 mm outside diameter, 30 mm bore and 16 mm width, envelope 30×47×16 mm. Mass is 109 g." }, { "q": "What does the NAO30×47×16-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO30×47×16-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×47×16 mm and the catalogue ratings are C 27.5 kN, C0 37.5 kN, Cur 6.3 kN." }, { "q": "What is the load capacity of the NAO30×47×16-XL?", "a": "The basic dynamic load rating C is 27.5 kN and the basic static load rating C0 is 37.5 kN; the fatigue load limit Cur is 6.3 kN." }, { "q": "What is the maximum speed of the NAO30×47×16-XL?", "a": "The limiting speed is 12,700 r/min and the thermal reference speed is 6,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO30×47×16-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO30X47X16", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO30X47X16-XL", "NAO30×47×16-XL" ], "locale_variants": {} }, { "sku": "NAO30X47X18-XL", "brand": "FAG", "manufacturer_designation": "NAO30×47×18-XL", "series": "nao-series", "type": "needle", "d_mm": 30, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31, "static_load_kN": 43, "fatigue_load_limit_kN": 7.5, "limiting_speed_rpm": 12700, "max_rpm": 12700, "reference_speed_rpm": 6900, "weight_g": 119, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×47×18 mm: 30 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 8.5 mm radial section packed with small-diameter needle rollers C is 31 kN and C0 43 kN at the 30 mm seat; the C/C0 ratio of 0.72 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 47 mm outside diameter the fatigue load limit Cur is 7.5 kN, the limiting speed 12,700 r/min and the thermal reference speed 6,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.03 kN/mm and per millimetre of width 1.72 kN/mm — the reason 18 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 119 g, just 0.14 g per mm² of projected 47×18 mm envelope, which keeps unbalanced forces low in fast-actuating linkages with a 30 mm bore the 18 mm width and 31 kN C rating suit high-cycle industrial machinery rather than instrument duty Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges The inner ring gives a 30 mm plain bore inside the 47×18 mm envelope and the flangeless pack delivers C 31 kN — a frequent choice in gear change linkages and pumps As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 7.5 kN Cur value. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 47 mm outside diameter and 31 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 30 mm seat, and in small electric motor accessory drives the 119 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 18 mm width and the published 43 kN static rating. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO." ], "faq": [ { "q": "What are the dimensions of the NAO30×47×18-XL?", "a": "The NAO30×47×18-XL is a NAO flangeless needle roller bearing with inner ring with 47 mm outside diameter, 30 mm bore and 18 mm width, envelope 30×47×18 mm. Mass is 119 g." }, { "q": "What does the NAO30×47×18-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO30×47×18-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×47×18 mm and the catalogue ratings are C 31 kN, C0 43 kN, Cur 7.5 kN." }, { "q": "What is the load capacity of the NAO30×47×18-XL?", "a": "The basic dynamic load rating C is 31 kN and the basic static load rating C0 is 43 kN; the fatigue load limit Cur is 7.5 kN." }, { "q": "What is the maximum speed of the NAO30×47×18-XL?", "a": "The limiting speed is 12,700 r/min and the thermal reference speed is 6,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO30×47×18-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 30 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO30X47X18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO30X47X18-XL", "NAO30×47×18-XL" ], "locale_variants": {} }, { "sku": "NAO35X50X17-XL", "brand": "FAG", "manufacturer_designation": "NAO35×50×17-XL", "series": "nao-series", "type": "needle", "d_mm": 35, "D_mm": 50, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 24.2, "static_load_kN": 41.5, "fatigue_load_limit_kN": 6.6, "limiting_speed_rpm": 11500, "max_rpm": 11500, "reference_speed_rpm": 6500, "weight_g": 113, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×50×17 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 24.2 kN and C0 41.5 kN at the 35 mm seat; the C/C0 ratio of 0.58 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 50 mm outside diameter the fatigue load limit Cur is 6.6 kN, the limiting speed 11,500 r/min and the thermal reference speed 6,500 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.69 kN/mm and per millimetre of width 1.42 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 113 g, just 0.13 g per mm² of projected 50×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 35 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 17 mm width as a standard mounting space NAO marks the flangeless needle bearing with an inner ring: the separable ribless races accept pure radial load while adjacent parts handle axial location, and the shaft needs no hardening As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 6.6 kN Cur value. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 50 mm outside diameter and 24.2 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 35 mm seat, and in textile machine heald and cam shafts the 113 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 17 mm width and the published 41.5 kN static rating. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways. Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NAO35×50×17-XL?", "a": "The NAO35×50×17-XL is a NAO flangeless needle roller bearing with inner ring with 50 mm outside diameter, 35 mm bore and 17 mm width, envelope 35×50×17 mm. Mass is 113 g." }, { "q": "What does the NAO35×50×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO35×50×17-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×50×17 mm and the catalogue ratings are C 24.2 kN, C0 41.5 kN, Cur 6.6 kN." }, { "q": "What is the load capacity of the NAO35×50×17-XL?", "a": "The basic dynamic load rating C is 24.2 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 6.6 kN." }, { "q": "What is the maximum speed of the NAO35×50×17-XL?", "a": "The limiting speed is 11,500 r/min and the thermal reference speed is 6,500 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO35×50×17-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO35X50X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO35X50X17-XL", "NAO35×50×17-XL" ], "locale_variants": {} }, { "sku": "NAO35X55X20-XL", "brand": "FAG", "manufacturer_designation": "NAO35×55×20-XL", "series": "nao-series", "type": "needle", "d_mm": 35, "D_mm": 55, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 37, "static_load_kN": 57, "fatigue_load_limit_kN": 9.1, "limiting_speed_rpm": 11300, "max_rpm": 11300, "reference_speed_rpm": 6200, "weight_g": 190, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×55×20 mm: 35 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 10.0 mm radial section packed with small-diameter needle rollers C is 37 kN and C0 57 kN at the 35 mm seat; the C/C0 ratio of 0.65 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 9.1 kN, the limiting speed 11,300 r/min and the thermal reference speed 6,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.06 kN/mm and per millimetre of width 1.85 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 190 g, just 0.17 g per mm² of projected 55×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages 35 mm bore marks the medium range: mounting forces and fits become critical, and the 190 g mass calls for proper induction or press tooling rather than hand fitting With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 57 kN and Cur 9.1 kN for the 190 g unit NAO marks the flangeless needle bearing with an inner ring: the separable ribless races accept pure radial load while adjacent parts handle axial location, and the shaft needs no hardening The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 35×55×20 mm envelope. Typical applications include planetary gear bearings, small electric motor accessory drives and gearbox selector and change linkages, where the 55 mm outside diameter and 37 kN dynamic rating match the duty. In planetary gear bearings the unit fits a compact 35 mm seat, and in small electric motor accessory drives the 190 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for gearbox selector and change linkages, relying on the 20 mm width and the published 57 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NAO35×55×20-XL?", "a": "The NAO35×55×20-XL is a NAO flangeless needle roller bearing with inner ring with 55 mm outside diameter, 35 mm bore and 20 mm width, envelope 35×55×20 mm. Mass is 190 g." }, { "q": "What does the NAO35×55×20-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO35×55×20-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×55×20 mm and the catalogue ratings are C 37 kN, C0 57 kN, Cur 9.1 kN." }, { "q": "What is the load capacity of the NAO35×55×20-XL?", "a": "The basic dynamic load rating C is 37 kN and the basic static load rating C0 is 57 kN; the fatigue load limit Cur is 9.1 kN." }, { "q": "What is the maximum speed of the NAO35×55×20-XL?", "a": "The limiting speed is 11,300 r/min and the thermal reference speed is 6,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO35×55×20-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 35 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO35X55X20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO35X55X20-XL", "NAO35×55×20-XL" ], "locale_variants": {} }, { "sku": "NAO40X55X17-XL", "brand": "FAG", "manufacturer_designation": "NAO40×55×17-XL", "series": "nao-series", "type": "needle", "d_mm": 40, "D_mm": 55, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.5, "static_load_kN": 46, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 10300, "max_rpm": 10300, "reference_speed_rpm": 5900, "weight_g": 127, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×55×17 mm: 40 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 7.5 mm radial section packed with small-diameter needle rollers C is 25.5 kN and C0 46 kN at the 40 mm seat; the C/C0 ratio of 0.55 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 55 mm outside diameter the fatigue load limit Cur is 7.3 kN, the limiting speed 10,300 r/min and the thermal reference speed 5,900 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.64 kN/mm and per millimetre of width 1.50 kN/mm — the reason 17 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 127 g, just 0.14 g per mm² of projected 55×17 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 40 mm bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 17 mm width as a standard mounting space The single needle row fills the thin section, with limiting speed 10,300 r/min and reference speed 5,900 r/min Flangeless NAO bearings tolerate ring displacement during mounting but not misalignment in operation — the 7.5 mm section is too thin to compensate for tilted seats The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 40×55×17 mm envelope. Typical applications include gearbox selector and change linkages, planetary gear bearings and copying and printing machine mechanisms, where the 55 mm outside diameter and 25.5 kN dynamic rating match the duty. In gearbox selector and change linkages the unit fits a compact 40 mm seat, and in planetary gear bearings the 127 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for copying and printing machine mechanisms, relying on the 17 mm width and the published 46 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "applications": [ "planetary gear bearings", "motorcycle and light-vehicle transmissions", "gearbox selector and change linkages", "copying and printing machine mechanisms" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately." ], "faq": [ { "q": "What are the dimensions of the NAO40×55×17-XL?", "a": "The NAO40×55×17-XL is a NAO flangeless needle roller bearing with inner ring with 55 mm outside diameter, 40 mm bore and 17 mm width, envelope 40×55×17 mm. Mass is 127 g." }, { "q": "What does the NAO40×55×17-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO40×55×17-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×55×17 mm and the catalogue ratings are C 25.5 kN, C0 46 kN, Cur 7.3 kN." }, { "q": "What is the load capacity of the NAO40×55×17-XL?", "a": "The basic dynamic load rating C is 25.5 kN and the basic static load rating C0 is 46 kN; the fatigue load limit Cur is 7.3 kN." }, { "q": "What is the maximum speed of the NAO40×55×17-XL?", "a": "The limiting speed is 10,300 r/min and the thermal reference speed is 5,900 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO40×55×17-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 40 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO40X55X17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO40X55X17-XL", "NAO40×55×17-XL" ], "locale_variants": {} }, { "sku": "NAO50X68X20-IS1-XL", "brand": "FAG", "manufacturer_designation": "NAO50×68×20-IS1-XL", "series": "nao-series", "type": "needle", "d_mm": 50, "D_mm": 68, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32, "static_load_kN": 66, "fatigue_load_limit_kN": 10.9, "limiting_speed_rpm": 8500, "max_rpm": 8500, "reference_speed_rpm": 5100, "weight_g": 230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×68×20 mm: 50 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 9.0 mm radial section packed with small-diameter needle rollers C is 32 kN and C0 66 kN at the 50 mm seat; the C/C0 ratio of 0.48 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 68 mm outside diameter the fatigue load limit Cur is 10.9 kN, the limiting speed 8,500 r/min and the thermal reference speed 5,100 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.64 kN/mm and per millimetre of width 1.60 kN/mm — the reason 20 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 230 g, just 0.17 g per mm² of projected 68×20 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 50 mm bore places this bearing in the medium band, where the 68 mm envelope already carries ratings in the tens of kilonewtons The inner ring gives a 50 mm plain bore inside the 68×20 mm envelope and the flangeless pack delivers C 32 kN — a frequent choice in gear change linkages and pumps NAO marks the flangeless needle bearing with an inner ring: the separable ribless races accept pure radial load while adjacent parts handle axial location, and the shaft needs no hardening X-life status (-XL) indicates the current Schaeffler premium execution at 50 mm bore; the 66 kN C0 rating reflects the improved rolling-contact geometry. -IS1 marks the inner-ring lubrication feature: grease reaches the needle pack via the groove machined around the inner ring of the NAO50×68×20-IS1-XL. Typical applications include copying and printing machine mechanisms, gearbox selector and change linkages and hydraulic and pneumatic pump eccentrics, where the 68 mm outside diameter and 32 kN dynamic rating match the duty. In copying and printing machine mechanisms the unit fits a compact 50 mm seat, and in gearbox selector and change linkages the 230 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for hydraulic and pneumatic pump eccentrics, relying on the 20 mm width and the published 66 kN static rating. On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "applications": [ "rocker arms and valve trains", "textile machine heald and cam shafts", "small electric motor accessory drives", "planetary gear bearings" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions.", "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NAO50×68×20-IS1-XL?", "a": "The NAO50×68×20-IS1-XL is a NAO flangeless needle roller bearing with inner ring with 68 mm outside diameter, 50 mm bore and 20 mm width, envelope 50×68×20 mm. Mass is 230 g." }, { "q": "What does the NAO50×68×20-IS1-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO50×68×20-IS1-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×68×20 mm and the catalogue ratings are C 32 kN, C0 66 kN, Cur 10.9 kN." }, { "q": "What is the load capacity of the NAO50×68×20-IS1-XL?", "a": "The basic dynamic load rating C is 32 kN and the basic static load rating C0 is 66 kN; the fatigue load limit Cur is 10.9 kN." }, { "q": "What is the maximum speed of the NAO50×68×20-IS1-XL?", "a": "The limiting speed is 8,500 r/min and the thermal reference speed is 5,100 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO50×68×20-IS1-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 50 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO50X68X20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO50X68X20-IS1-XL", "NAO50×68×20-IS1-XL" ], "locale_variants": {} }, { "sku": "NAO70X100X30-XL", "brand": "FAG", "manufacturer_designation": "NAO70×100×30-XL", "series": "nao-series", "type": "needle", "d_mm": 70, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 176, "fatigue_load_limit_kN": 31.5, "limiting_speed_rpm": 5800, "max_rpm": 5800, "reference_speed_rpm": 3350, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 70×100×30 mm: 70 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 80 kN and C0 176 kN at the 70 mm seat; the C/C0 ratio of 0.45 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 100 mm outside diameter the fatigue load limit Cur is 31.5 kN, the limiting speed 5,800 r/min and the thermal reference speed 3,350 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.14 kN/mm and per millimetre of width 2.67 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 850 g, just 0.28 g per mm² of projected 100×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 70 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery The inner ring gives a 70 mm plain bore inside the 100×30 mm envelope and the flangeless pack delivers C 80 kN — a frequent choice in gear change linkages and pumps Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 70×100×30 mm envelope. Typical applications include hydraulic and pneumatic pump eccentrics, copying and printing machine mechanisms and agricultural machine pivots and linkages, where the 100 mm outside diameter and 80 kN dynamic rating match the duty. In hydraulic and pneumatic pump eccentrics the unit fits a compact 70 mm seat, and in copying and printing machine mechanisms the 850 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for agricultural machine pivots and linkages, relying on the 30 mm width and the published 176 kN static rating. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "hydraulic and pneumatic pump eccentrics", "small electric motor accessory drives", "agricultural machine pivots and linkages", "textile machine heald and cam shafts" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Do not press an RNA/NK assembly in through the outer ring when mounting it on a shaft, and vice versa — rolling forces through the wrong ring bruises the raceways." ], "faq": [ { "q": "What are the dimensions of the NAO70×100×30-XL?", "a": "The NAO70×100×30-XL is a NAO flangeless needle roller bearing with inner ring with 100 mm outside diameter, 70 mm bore and 30 mm width, envelope 70×100×30 mm. Mass is 850 g." }, { "q": "What does the NAO70×100×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO70×100×30-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 70×100×30 mm and the catalogue ratings are C 80 kN, C0 176 kN, Cur 31.5 kN." }, { "q": "What is the load capacity of the NAO70×100×30-XL?", "a": "The basic dynamic load rating C is 80 kN and the basic static load rating C0 is 176 kN; the fatigue load limit Cur is 31.5 kN." }, { "q": "What is the maximum speed of the NAO70×100×30-XL?", "a": "The limiting speed is 5,800 r/min and the thermal reference speed is 3,350 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO70×100×30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 70 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO70X100X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO70X100X30-XL", "NAO70×100×30-XL" ], "locale_variants": {} }, { "sku": "NAO80X110X30-XL", "brand": "FAG", "manufacturer_designation": "NAO80×110×30-XL", "series": "nao-series", "type": "needle", "d_mm": 80, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 76, "static_load_kN": 172, "fatigue_load_limit_kN": 30, "limiting_speed_rpm": 5200, "max_rpm": 5200, "reference_speed_rpm": 3200, "weight_g": 920, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 80×110×30 mm: 80 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 76 kN and C0 172 kN at the 80 mm seat; the C/C0 ratio of 0.44 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 110 mm outside diameter the fatigue load limit Cur is 30 kN, the limiting speed 5,200 r/min and the thermal reference speed 3,200 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.95 kN/mm and per millimetre of width 2.53 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 920 g, just 0.28 g per mm² of projected 110×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 80 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Because neither ring guides axially, housing and shaft shoulders position the races; uncontrolled end float lets the rollers run off the raceway edges NAO marks the flangeless needle bearing with an inner ring: the separable ribless races accept pure radial load while adjacent parts handle axial location, and the shaft needs no hardening X-life status (-XL) indicates the current Schaeffler premium execution at 80 mm bore; the 172 kN C0 rating reflects the improved rolling-contact geometry. Typical applications include connecting-rod small ends, textile machine heald and cam shafts and motorcycle and light-vehicle transmissions, where the 110 mm outside diameter and 76 kN dynamic rating match the duty. In connecting-rod small ends the unit fits a compact 80 mm seat, and in textile machine heald and cam shafts the 920 g mass keeps unbalanced forces low in fast linkages. Designers also specify it for motorcycle and light-vehicle transmissions, relying on the 30 mm width and the published 172 kN static rating. Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "applications": [ "connecting-rod small ends", "copying and printing machine mechanisms", "motorcycle and light-vehicle transmissions", "two-stroke and compressor piston pins" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Adding an IR inner ring changes the envelope logic: the same outer assembly then fits a smaller shaft — recheck bore, clearance and ratings when substituting.", "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Without an inner ring the shaft is the raceway: 58–64 HRC and a ground, polished journal are mandatory, not recommendations." ], "faq": [ { "q": "What are the dimensions of the NAO80×110×30-XL?", "a": "The NAO80×110×30-XL is a NAO flangeless needle roller bearing with inner ring with 110 mm outside diameter, 80 mm bore and 30 mm width, envelope 80×110×30 mm. Mass is 920 g." }, { "q": "What does the NAO80×110×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO80×110×30-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 80×110×30 mm and the catalogue ratings are C 76 kN, C0 172 kN, Cur 30 kN." }, { "q": "What is the load capacity of the NAO80×110×30-XL?", "a": "The basic dynamic load rating C is 76 kN and the basic static load rating C0 is 172 kN; the fatigue load limit Cur is 30 kN." }, { "q": "What is the maximum speed of the NAO80×110×30-XL?", "a": "The limiting speed is 5,200 r/min and the thermal reference speed is 3,200 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO80×110×30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 80 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO80X110X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO80X110X30-XL", "NAO80×110×30-XL" ], "locale_variants": {} }, { "sku": "NAO90X120X30-XL", "brand": "FAG", "manufacturer_designation": "NAO90×120×30-XL", "series": "nao-series", "type": "needle", "d_mm": 90, "D_mm": 120, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 80, "static_load_kN": 188, "fatigue_load_limit_kN": 32.5, "limiting_speed_rpm": 4700, "max_rpm": 4700, "reference_speed_rpm": 2950, "weight_g": 1044, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 90×120×30 mm: 90 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 15.0 mm radial section packed with small-diameter needle rollers C is 80 kN and C0 188 kN at the 90 mm seat; the C/C0 ratio of 0.43 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 120 mm outside diameter the fatigue load limit Cur is 32.5 kN, the limiting speed 4,700 r/min and the thermal reference speed 2,950 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 0.89 kN/mm and per millimetre of width 2.67 kN/mm — the reason 30 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.044 kg (1044 g), just 0.29 g per mm² of projected 120×30 mm envelope, which keeps unbalanced forces low in fast-actuating linkages the 90 mm bore belongs to the large band, where HR1 full-complement and track-roller designs deliver their highest kilonewton ratings in slow, heavily loaded machinery Reading NAO: the O-suffix race design has no integral ribs on either ring, so the bearing can be separated and the outer assembly swivelled into split housings during mounting With the inner ring fitted the shaft seat stays at normal bearing-shaft tolerance; C0 is 188 kN and Cur 32.5 kN for the 1044 g unit As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 32.5 kN Cur value. Typical applications include textile machine heald and cam shafts, agricultural machine pivots and linkages and connecting-rod small ends, where the 120 mm outside diameter and 80 kN dynamic rating match the duty. In textile machine heald and cam shafts the unit fits a compact 90 mm seat, and in agricultural machine pivots and linkages the 1.044 kg mass is part of the rotor inertia calculation. Designers also specify it for connecting-rod small ends, relying on the 30 mm width and the published 188 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "applications": [ "motorcycle and light-vehicle transmissions", "hydraulic and pneumatic pump eccentrics", "two-stroke and compressor piston pins", "rocker arms and valve trains" ], "failure_modes": [ "journal brinelling when a no-inner-ring bearing runs on a shaft hardened below 58 HRC or finished too rough", "needle skewing and jamming after momentary unloading of a flangeless (RNAO/NAO) pack", "raceway pitting from contamination drawn through the open ends of an unsealed bearing", "edge loading at the roller ends from a tapered or lobed shaft seat", "cage damage from shock loading or from pressing the bearing through the wrong ring", "lubricant starvation on fast reciprocating strokes that never fully rotate the needles", "false brinelling during stationary transport vibration", "spalling from excessive interference that removes the radial clearance", "roller wear from misaligned connecting-rod eyes and rocker bores" ], "pitfalls": [ "Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.", "Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.", "On reciprocating duty ensure the stroke rotates the full needle set, or brinelling occurs at the same roller positions." ], "faq": [ { "q": "What are the dimensions of the NAO90×120×30-XL?", "a": "The NAO90×120×30-XL is a NAO flangeless needle roller bearing with inner ring with 120 mm outside diameter, 90 mm bore and 30 mm width, envelope 90×120×30 mm. Mass is 1.044 kg." }, { "q": "What does the NAO90×120×30-XL designation mean in the FAG/INA HR1 catalogue?", "a": "NAO90×120×30-XL identifies this NAO flangeless needle roller bearing with inner ring in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 90×120×30 mm and the catalogue ratings are C 80 kN, C0 188 kN, Cur 32.5 kN." }, { "q": "What is the load capacity of the NAO90×120×30-XL?", "a": "The basic dynamic load rating C is 80 kN and the basic static load rating C0 is 188 kN; the fatigue load limit Cur is 32.5 kN." }, { "q": "What is the maximum speed of the NAO90×120×30-XL?", "a": "The limiting speed is 4,700 r/min and the thermal reference speed is 2,950 r/min. In the Schaeffler catalogue the reference speed is the thermally permissible running speed under defined load; the lower of the two values governs each application." }, { "q": "How is the NAO90×120×30-XL mounted on the shaft?", "a": "The integral inner ring accepts an ordinary ground shaft at the 90 mm nominal bore with the recommended normal bearing-seat tolerance; no hardening is required. The ring is separable, so the outer assembly can be pressed into the housing first and the inner ring fitted with the shaft." } ], "cross_ref": [ { "equiv_sku": "NAO90X120X30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=971", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NAO90X120X30-XL", "NAO90×120×30-XL" ], "locale_variants": {} }, { "sku": "RSTO5-TV", "brand": "FAG", "manufacturer_designation": "RSTO5-TV", "series": "rsto-series", "type": "support_roller", "d_mm": 7, "D_mm": 16, "B_mm": 7.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 2.55, "static_load_kN": 2.65, "fatigue_load_limit_kN": 0.335, "limiting_speed_rpm": 16000, "max_rpm": 16000, "weight_g": 8.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 7×16×7.8 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 7 mm bore — and the 7.8 mm width sets the contact width on the mating track the catalogue lists C 2.55 kN and C0 2.65 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.96 reflects a rolling-element pack sized for heavy static track loading, and the 4.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.335 kN at 7 mm bore, equivalent to 0.36 kN of dynamic rating per millimetre — the limiting speed is 16,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 7 mm bore takes the mounting pin or shaft; across the 7.8 mm contact width the dynamic rating works out to 0.33 kN per millimetre of rolling-element complement mass is 8.5 g, or 0.07 g per mm² of the 16×7.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 7 mm pin bore and only 8.5 g: the smallest sizes demand accurate shaft geometry, because the 4.5 mm section leaves no tolerance for a soft or tapered seat At 8.5 g the roller adds little inertia to follower linkages, but the unflanged design walks off a skewed track — track parallelism substitutes for the missing guidance Reading RSTO: yoke roller, no inner ring, no flanges; lateral guidance and contamination protection must come from the machine structure around the 7.8 mm-wide roller With the -TV polyamide cage the rollers are positively separated, so the 7 mm bearing suits continuous rotation rather than the slow oscillating duty where cageless packs are chosen. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 16 mm track diameter and 2.55 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 7 mm seat, and in printing press sheet-transfer grippers the 8.5 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 7.8 mm width and the published 2.65 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the RSTO5-TV?", "a": "The RSTO5-TV is a RSTO yoke-type track roller without inner ring, without axial guidance with 16 mm outside diameter, 7 mm bore and 7.8 mm width, envelope 7×16×7.8 mm. Mass is 8.5 g." }, { "q": "What does the RSTO5-TV designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO5-TV identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 7×16×7.8 mm and the catalogue ratings are C 2.55 kN, C0 2.65 kN, Cur 0.335 kN." }, { "q": "What is the load capacity of the RSTO5-TV?", "a": "The basic dynamic load rating C is 2.55 kN and the basic static load rating C0 is 2.65 kN; the fatigue load limit Cur is 0.335 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO5-TV?", "a": "HR1 lists a limiting speed of 16,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO5-TV?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 16 mm outer surface tolerates only small angular error. The 7 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO5", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO5-TV", "RSTO5-TV" ], "locale_variants": {} }, { "sku": "RSTO6-TV", "brand": "FAG", "manufacturer_designation": "RSTO6-TV", "series": "rsto-series", "type": "support_roller", "d_mm": 10, "D_mm": 19, "B_mm": 9.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 3.75, "static_load_kN": 4.6, "fatigue_load_limit_kN": 0.66, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 12.5, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×19×9.8 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 9.8 mm width sets the contact width on the mating track the catalogue lists C 3.75 kN and C0 4.6 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.82 reflects a rolling-element pack sized for heavy static track loading, and the 4.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.66 kN at 10 mm bore, equivalent to 0.38 kN of dynamic rating per millimetre — the limiting speed is 10,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 9.8 mm contact width the dynamic rating works out to 0.38 kN per millimetre of rolling-element complement mass is 12.5 g, or 0.07 g per mm² of the 19×9.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 10 mm pin bore and only 12.5 g: the smallest sizes demand accurate shaft geometry, because the 4.5 mm section leaves no tolerance for a soft or tapered seat With C 3.75 kN and C0 4.6 kN the roller accepts track loads directly; the 10,000 r/min limiting speed is the only speed figure HR1 publishes for track rollers The thick-walled outer ring is the running element — 19 mm outside diameter over a 10 mm pin seat — and is made to roll flat on a mating track rather than inside a housing Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 12.5 g in the 19 mm envelope. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 19 mm track diameter and 3.75 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 10 mm seat, and in packaging machine timing mechanisms the 12.5 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 9.8 mm width and the published 4.6 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 19 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the RSTO6-TV?", "a": "The RSTO6-TV is a RSTO yoke-type track roller without inner ring, without axial guidance with 19 mm outside diameter, 10 mm bore and 9.8 mm width, envelope 10×19×9.8 mm. Mass is 12.5 g." }, { "q": "What does the RSTO6-TV designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO6-TV identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×19×9.8 mm and the catalogue ratings are C 3.75 kN, C0 4.6 kN, Cur 0.66 kN." }, { "q": "What is the load capacity of the RSTO6-TV?", "a": "The basic dynamic load rating C is 3.75 kN and the basic static load rating C0 is 4.6 kN; the fatigue load limit Cur is 0.66 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO6-TV?", "a": "HR1 lists a limiting speed of 10,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO6-TV?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The 10 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO6", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO6-TV", "RSTO6-TV" ], "locale_variants": {} }, { "sku": "RSTO8-TV", "brand": "FAG", "manufacturer_designation": "RSTO8-TV", "series": "rsto-series", "type": "support_roller", "d_mm": 12, "D_mm": 24, "B_mm": 9.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 4.2, "static_load_kN": 5.6, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 21, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×24×9.8 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 9.8 mm width sets the contact width on the mating track the catalogue lists C 4.2 kN and C0 5.6 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.75 reflects a rolling-element pack sized for heavy static track loading, and the 6.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.8 kN at 12 mm bore, equivalent to 0.35 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 9.8 mm contact width the dynamic rating works out to 0.43 kN per millimetre of rolling-element complement mass is 21 g, or 0.09 g per mm² of the 24×9.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 12 mm pin bore and only 21 g: the smallest sizes demand accurate shaft geometry, because the 6.0 mm section leaves no tolerance for a soft or tapered seat The pin surface at 12 mm must be hardened to 58–64 HRC like a shaft raceway; a soft pin flats quickly under the 5.6 kN static load RSTO rollers separate into their components, so the outer ring and needle-cage assembly can be placed in a yoke eye and retained by the pin during build -TV denotes the PA66 cage: light, quiet and self-lubricating in dry-running moments, but limited by the polymer's continuous-temperature ceiling well below the ring steel's. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 24 mm track diameter and 4.2 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 12 mm seat, and in woodworking machine feed tracks the 21 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 9.8 mm width and the published 5.6 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 24 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the RSTO8-TV?", "a": "The RSTO8-TV is a RSTO yoke-type track roller without inner ring, without axial guidance with 24 mm outside diameter, 12 mm bore and 9.8 mm width, envelope 12×24×9.8 mm. Mass is 21 g." }, { "q": "What does the RSTO8-TV designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO8-TV identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×24×9.8 mm and the catalogue ratings are C 4.2 kN, C0 5.6 kN, Cur 0.8 kN." }, { "q": "What is the load capacity of the RSTO8-TV?", "a": "The basic dynamic load rating C is 4.2 kN and the basic static load rating C0 is 5.6 kN; the fatigue load limit Cur is 0.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO8-TV?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO8-TV?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The 12 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO8", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO8-TV", "RSTO8-TV" ], "locale_variants": {} }, { "sku": "RSTO10", "brand": "FAG", "manufacturer_designation": "RSTO10", "series": "rsto-series", "type": "support_roller", "d_mm": 14, "D_mm": 30, "B_mm": 11.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.4, "static_load_kN": 9.5, "fatigue_load_limit_kN": 1.39, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 42, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 14×30×11.8 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 14 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 8.4 kN and C0 9.5 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.88 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.39 kN at 14 mm bore, equivalent to 0.60 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 14 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.71 kN per millimetre of rolling-element complement mass is 42 g, or 0.12 g per mm² of the 30×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 14 mm pin bore this size balances the 30 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range RSTO is the basic yoke-type track roller without inner ring and without axial guidance: the needle rollers run directly on a hardened, ground mounting pin Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 30 mm track diameter and 8.4 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 14 mm seat, and in packaging machine timing mechanisms the 42 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 11.8 mm width and the published 9.5 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the RSTO10?", "a": "The RSTO10 is a RSTO yoke-type track roller without inner ring, without axial guidance with 30 mm outside diameter, 14 mm bore and 11.8 mm width, envelope 14×30×11.8 mm. Mass is 42 g." }, { "q": "What does the RSTO10 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO10 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 14×30×11.8 mm and the catalogue ratings are C 8.4 kN, C0 9.5 kN, Cur 1.39 kN." }, { "q": "What is the load capacity of the RSTO10?", "a": "The basic dynamic load rating C is 8.4 kN and the basic static load rating C0 is 9.5 kN; the fatigue load limit Cur is 1.39 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO10?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO10?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The 14 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO10", "RSTO10" ], "locale_variants": {} }, { "sku": "RSTO12", "brand": "FAG", "manufacturer_designation": "RSTO12", "series": "rsto-series", "type": "support_roller", "d_mm": 16, "D_mm": 32, "B_mm": 11.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9, "static_load_kN": 10.4, "fatigue_load_limit_kN": 1.56, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 49, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×32×11.8 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 9 kN and C0 10.4 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.87 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.56 kN at 16 mm bore, equivalent to 0.56 kN of dynamic rating per millimetre — the limiting speed is 4,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.76 kN per millimetre of rolling-element complement mass is 49 g, or 0.13 g per mm² of the 32×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 16 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty With C 9 kN and C0 10.4 kN the roller accepts track loads directly; the 4,500 r/min limiting speed is the only speed figure HR1 publishes for track rollers Reading RSTO: yoke roller, no inner ring, no flanges; lateral guidance and contamination protection must come from the machine structure around the 11.8 mm-wide roller Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 32 mm track diameter and 9 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 16 mm seat, and in cam drives and indexing tables the 49 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 11.8 mm width and the published 10.4 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the RSTO12?", "a": "The RSTO12 is a RSTO yoke-type track roller without inner ring, without axial guidance with 32 mm outside diameter, 16 mm bore and 11.8 mm width, envelope 16×32×11.8 mm. Mass is 49 g." }, { "q": "What does the RSTO12 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO12 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×32×11.8 mm and the catalogue ratings are C 9 kN, C0 10.4 kN, Cur 1.56 kN." }, { "q": "What is the load capacity of the RSTO12?", "a": "The basic dynamic load rating C is 9 kN and the basic static load rating C0 is 10.4 kN; the fatigue load limit Cur is 1.56 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO12?", "a": "HR1 lists a limiting speed of 4,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO12?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The 16 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO12", "RSTO12" ], "locale_variants": {} }, { "sku": "RSTO15", "brand": "FAG", "manufacturer_designation": "RSTO15", "series": "rsto-series", "type": "support_roller", "d_mm": 20, "D_mm": 35, "B_mm": 11.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.1, "static_load_kN": 11.1, "fatigue_load_limit_kN": 1.67, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 50, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×35×11.8 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 9.1 kN and C0 11.1 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.82 reflects a rolling-element pack sized for heavy static track loading, and the 7.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.67 kN at 20 mm bore, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 3,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.77 kN per millimetre of rolling-element complement mass is 50 g, or 0.12 g per mm² of the 35×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The thick-walled outer ring is the running element — 35 mm outside diameter over a 20 mm pin seat — and is made to roll flat on a mating track rather than inside a housing Reading RSTO: yoke roller, no inner ring, no flanges; lateral guidance and contamination protection must come from the machine structure around the 11.8 mm-wide roller Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 35 mm track diameter and 9.1 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 20 mm seat, and in linear rail and profile track guidance the 50 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 11.8 mm width and the published 11.1 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the RSTO15?", "a": "The RSTO15 is a RSTO yoke-type track roller without inner ring, without axial guidance with 35 mm outside diameter, 20 mm bore and 11.8 mm width, envelope 20×35×11.8 mm. Mass is 50 g." }, { "q": "What does the RSTO15 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO15 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×35×11.8 mm and the catalogue ratings are C 9.1 kN, C0 11.1 kN, Cur 1.67 kN." }, { "q": "What is the load capacity of the RSTO15?", "a": "The basic dynamic load rating C is 9.1 kN and the basic static load rating C0 is 11.1 kN; the fatigue load limit Cur is 1.67 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO15?", "a": "HR1 lists a limiting speed of 3,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO15?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The 20 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO15", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO15", "RSTO15" ], "locale_variants": {} }, { "sku": "RSTO17", "brand": "FAG", "manufacturer_designation": "RSTO17", "series": "rsto-series", "type": "support_roller", "d_mm": 22, "D_mm": 40, "B_mm": 15.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.2, "static_load_kN": 18.2, "fatigue_load_limit_kN": 2.55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 88, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×40×15.8 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 22 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 14.2 kN and C0 18.2 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 9.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.55 kN at 22 mm bore, equivalent to 0.65 kN of dynamic rating per millimetre — the limiting speed is 2,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 22 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 0.90 kN per millimetre of rolling-element complement mass is 88 g, or 0.14 g per mm² of the 40×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 22 mm pin bore the 15.8 mm width and 14.2 kN C rating suit high-cycle industrial machinery rather than instrument duty The pin surface at 22 mm must be hardened to 58–64 HRC like a shaft raceway; a soft pin flats quickly under the 18.2 kN static load Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 40 mm track diameter and 14.2 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 22 mm seat, and in automotive welding jig rollers the 88 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 15.8 mm width and the published 18.2 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the RSTO17?", "a": "The RSTO17 is a RSTO yoke-type track roller without inner ring, without axial guidance with 40 mm outside diameter, 22 mm bore and 15.8 mm width, envelope 22×40×15.8 mm. Mass is 88 g." }, { "q": "What does the RSTO17 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO17 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 22×40×15.8 mm and the catalogue ratings are C 14.2 kN, C0 18.2 kN, Cur 2.55 kN." }, { "q": "What is the load capacity of the RSTO17?", "a": "The basic dynamic load rating C is 14.2 kN and the basic static load rating C0 is 18.2 kN; the fatigue load limit Cur is 2.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO17?", "a": "HR1 lists a limiting speed of 2,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO17?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The 22 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO17", "RSTO17" ], "locale_variants": {} }, { "sku": "RSTO20", "brand": "FAG", "manufacturer_designation": "RSTO20", "series": "rsto-series", "type": "support_roller", "d_mm": 25, "D_mm": 47, "B_mm": 15.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.1, "static_load_kN": 22, "fatigue_load_limit_kN": 3.1, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×47×15.8 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 16.1 kN and C0 22 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.1 kN at 25 mm bore, equivalent to 0.64 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 1.02 kN per millimetre of rolling-element complement mass is 130 g, or 0.18 g per mm² of the 47×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 25 mm pin bore the 15.8 mm width and 16.1 kN C rating suit high-cycle industrial machinery rather than instrument duty At 130 g the roller adds little inertia to follower linkages, but the unflanged design walks off a skewed track — track parallelism substitutes for the missing guidance RSTO is the basic yoke-type track roller without inner ring and without axial guidance: the needle rollers run directly on a hardened, ground mounting pin Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 47 mm track diameter and 16.1 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 25 mm seat, and in automatic assembly machine carriages the 130 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 15.8 mm width and the published 22 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the RSTO20?", "a": "The RSTO20 is a RSTO yoke-type track roller without inner ring, without axial guidance with 47 mm outside diameter, 25 mm bore and 15.8 mm width, envelope 25×47×15.8 mm. Mass is 130 g." }, { "q": "What does the RSTO20 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO20 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×47×15.8 mm and the catalogue ratings are C 16.1 kN, C0 22 kN, Cur 3.1 kN." }, { "q": "What is the load capacity of the RSTO20?", "a": "The basic dynamic load rating C is 16.1 kN and the basic static load rating C0 is 22 kN; the fatigue load limit Cur is 3.1 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO20?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO20?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The 25 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO20", "RSTO20" ], "locale_variants": {} }, { "sku": "RSTO25", "brand": "FAG", "manufacturer_designation": "RSTO25", "series": "rsto-series", "type": "support_roller", "d_mm": 30, "D_mm": 52, "B_mm": 15.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.4, "static_load_kN": 23.5, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×52×15.8 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 16.4 kN and C0 23.5 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.70 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.35 kN at 30 mm bore, equivalent to 0.55 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 1.04 kN per millimetre of rolling-element complement mass is 150 g, or 0.18 g per mm² of the 52×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 30 mm pin bore this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range With C 16.4 kN and C0 23.5 kN the roller accepts track loads directly; the 1,800 r/min limiting speed is the only speed figure HR1 publishes for track rollers RSTO rollers separate into their components, so the outer ring and needle-cage assembly can be placed in a yoke eye and retained by the pin during build Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 52 mm track diameter and 16.4 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 30 mm seat, and in packaging machine timing mechanisms the 150 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 15.8 mm width and the published 23.5 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the RSTO25?", "a": "The RSTO25 is a RSTO yoke-type track roller without inner ring, without axial guidance with 52 mm outside diameter, 30 mm bore and 15.8 mm width, envelope 30×52×15.8 mm. Mass is 150 g." }, { "q": "What does the RSTO25 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO25 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×52×15.8 mm and the catalogue ratings are C 16.4 kN, C0 23.5 kN, Cur 3.35 kN." }, { "q": "What is the load capacity of the RSTO25?", "a": "The basic dynamic load rating C is 16.4 kN and the basic static load rating C0 is 23.5 kN; the fatigue load limit Cur is 3.35 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO25?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO25?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The 30 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO25", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO25", "RSTO25" ], "locale_variants": {} }, { "sku": "RSTO30", "brand": "FAG", "manufacturer_designation": "RSTO30", "series": "rsto-series", "type": "support_roller", "d_mm": 38, "D_mm": 62, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.1, "static_load_kN": 35.5, "fatigue_load_limit_kN": 4.8, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 255, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 38×62×19.8 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 38 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 23.1 kN and C0 35.5 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.65 reflects a rolling-element pack sized for heavy static track loading, and the 12.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.8 kN at 38 mm bore, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 38 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.17 kN per millimetre of rolling-element complement mass is 255 g, or 0.21 g per mm² of the 62×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 38 mm pin bore places this bearing in the medium band, where the 62 mm envelope already carries ratings in the tens of kilonewtons The thick-walled outer ring is the running element — 62 mm outside diameter over a 38 mm pin seat — and is made to roll flat on a mating track rather than inside a housing With C 23.1 kN and C0 35.5 kN the roller accepts track loads directly; the 1,300 r/min limiting speed is the only speed figure HR1 publishes for track rollers Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 62 mm track diameter and 23.1 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 38 mm seat, and in woodworking machine feed tracks the 255 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 19.8 mm width and the published 35.5 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 62 mm outer ring does.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 62 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the RSTO30?", "a": "The RSTO30 is a RSTO yoke-type track roller without inner ring, without axial guidance with 62 mm outside diameter, 38 mm bore and 19.8 mm width, envelope 38×62×19.8 mm. Mass is 255 g." }, { "q": "What does the RSTO30 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO30 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 38×62×19.8 mm and the catalogue ratings are C 23.1 kN, C0 35.5 kN, Cur 4.8 kN." }, { "q": "What is the load capacity of the RSTO30?", "a": "The basic dynamic load rating C is 23.1 kN and the basic static load rating C0 is 35.5 kN; the fatigue load limit Cur is 4.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO30?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO30?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The 38 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO30", "RSTO30" ], "locale_variants": {} }, { "sku": "RSTO35", "brand": "FAG", "manufacturer_designation": "RSTO35", "series": "rsto-series", "type": "support_roller", "d_mm": 42, "D_mm": 72, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25, "static_load_kN": 41, "fatigue_load_limit_kN": 5.5, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 375, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×72×19.8 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 42 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25 kN and C0 41 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.61 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.5 kN at 42 mm bore, equivalent to 0.60 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 42 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.26 kN per millimetre of rolling-element complement mass is 375 g, or 0.26 g per mm² of the 72×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 42 mm pin bore marks the medium range: mounting forces and fits become critical, and the 375 g mass calls for proper induction or press tooling rather than hand fitting Reading RSTO: yoke roller, no inner ring, no flanges; lateral guidance and contamination protection must come from the machine structure around the 19.8 mm-wide roller RSTO rollers separate into their components, so the outer ring and needle-cage assembly can be placed in a yoke eye and retained by the pin during build Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 72 mm track diameter and 25 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 42 mm seat, and in automatic assembly machine carriages the 375 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 19.8 mm width and the published 41 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the RSTO35?", "a": "The RSTO35 is a RSTO yoke-type track roller without inner ring, without axial guidance with 72 mm outside diameter, 42 mm bore and 19.8 mm width, envelope 42×72×19.8 mm. Mass is 375 g." }, { "q": "What does the RSTO35 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO35 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 42×72×19.8 mm and the catalogue ratings are C 25 kN, C0 41 kN, Cur 5.5 kN." }, { "q": "What is the load capacity of the RSTO35?", "a": "The basic dynamic load rating C is 25 kN and the basic static load rating C0 is 41 kN; the fatigue load limit Cur is 5.5 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO35?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO35?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The 42 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO35", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO35", "RSTO35" ], "locale_variants": {} }, { "sku": "RSTO40", "brand": "FAG", "manufacturer_designation": "RSTO40", "series": "rsto-series", "type": "support_roller", "d_mm": 50, "D_mm": 80, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.7, "static_load_kN": 40, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×80×19.8 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 23.7 kN and C0 40 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 50 mm bore, equivalent to 0.47 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.20 kN per millimetre of rolling-element complement mass is 420 g, or 0.27 g per mm² of the 80×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 50 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 19.8 mm width as a standard mounting space With C 23.7 kN and C0 40 kN the roller accepts track loads directly; the 850 r/min limiting speed is the only speed figure HR1 publishes for track rollers At 420 g the roller adds little inertia to follower linkages, but the unflanged design walks off a skewed track — track parallelism substitutes for the missing guidance Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 80 mm track diameter and 23.7 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 50 mm seat, and in automotive welding jig rollers the 420 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 19.8 mm width and the published 40 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the RSTO40?", "a": "The RSTO40 is a RSTO yoke-type track roller without inner ring, without axial guidance with 80 mm outside diameter, 50 mm bore and 19.8 mm width, envelope 50×80×19.8 mm. Mass is 420 g." }, { "q": "What does the RSTO40 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO40 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 50×80×19.8 mm and the catalogue ratings are C 23.7 kN, C0 40 kN, Cur 6 kN." }, { "q": "What is the load capacity of the RSTO40?", "a": "The basic dynamic load rating C is 23.7 kN and the basic static load rating C0 is 40 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO40?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO40?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The 50 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO40", "RSTO40" ], "locale_variants": {} }, { "sku": "RSTO45", "brand": "FAG", "manufacturer_designation": "RSTO45", "series": "rsto-series", "type": "support_roller", "d_mm": 55, "D_mm": 85, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25, "static_load_kN": 44, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 453, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 55×85×19.8 mm: the 85 mm outside diameter is the track-running surface — a thick-walled outer ring over a 55 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25 kN and C0 44 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.57 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 55 mm bore, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 750 r/min and, as for HR1 track rollers, no thermal reference speed is published the 55 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.26 kN per millimetre of rolling-element complement mass is 453 g, or 0.27 g per mm² of the 85×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 55 mm pin bore places this bearing in the medium band, where the 85 mm envelope already carries ratings in the tens of kilonewtons RSTO is the basic yoke-type track roller without inner ring and without axial guidance: the needle rollers run directly on a hardened, ground mounting pin The pin surface at 55 mm must be hardened to 58–64 HRC like a shaft raceway; a soft pin flats quickly under the 44 kN static load Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 85 mm track diameter and 25 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 55 mm seat, and in woodworking machine feed tracks the 453 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 19.8 mm width and the published 44 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 85 mm outer ring does. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 85 mm outer ring does.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the RSTO45?", "a": "The RSTO45 is a RSTO yoke-type track roller without inner ring, without axial guidance with 85 mm outside diameter, 55 mm bore and 19.8 mm width, envelope 55×85×19.8 mm. Mass is 453 g." }, { "q": "What does the RSTO45 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO45 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 55×85×19.8 mm and the catalogue ratings are C 25 kN, C0 44 kN, Cur 6 kN." }, { "q": "What is the load capacity of the RSTO45?", "a": "The basic dynamic load rating C is 25 kN and the basic static load rating C0 is 44 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO45?", "a": "HR1 lists a limiting speed of 750 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO45?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 85 mm outer surface tolerates only small angular error. The 55 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO45", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO45", "RSTO45" ], "locale_variants": {} }, { "sku": "RSTO50", "brand": "FAG", "manufacturer_designation": "RSTO50", "series": "rsto-series", "type": "support_roller", "d_mm": 60, "D_mm": 90, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.5, "static_load_kN": 47, "fatigue_load_limit_kN": 6.4, "limiting_speed_rpm": 650, "max_rpm": 650, "weight_g": 481, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 60×90×19.8 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 60 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25.5 kN and C0 47 kN for the RSTO yoke-type track roller without inner ring, without axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6.4 kN at 60 mm bore, equivalent to 0.42 kN of dynamic rating per millimetre — the limiting speed is 650 r/min and, as for HR1 track rollers, no thermal reference speed is published the 60 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.29 kN per millimetre of rolling-element complement mass is 481 g, or 0.27 g per mm² of the 90×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 60 mm pin bore marks the medium range: mounting forces and fits become critical, and the 481 g mass calls for proper induction or press tooling rather than hand fitting Reading RSTO: yoke roller, no inner ring, no flanges; lateral guidance and contamination protection must come from the machine structure around the 19.8 mm-wide roller At 481 g the roller adds little inertia to follower linkages, but the unflanged design walks off a skewed track — track parallelism substitutes for the missing guidance Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 90 mm track diameter and 25.5 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 60 mm seat, and in cam drives and indexing tables the 481 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 19.8 mm width and the published 47 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the RSTO50?", "a": "The RSTO50 is a RSTO yoke-type track roller without inner ring, without axial guidance with 90 mm outside diameter, 60 mm bore and 19.8 mm width, envelope 60×90×19.8 mm. Mass is 481 g." }, { "q": "What does the RSTO50 designation mean in the FAG/INA HR1 catalogue?", "a": "RSTO50 identifies this RSTO yoke-type track roller without inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 60×90×19.8 mm and the catalogue ratings are C 25.5 kN, C0 47 kN, Cur 6.4 kN." }, { "q": "What is the load capacity of the RSTO50?", "a": "The basic dynamic load rating C is 25.5 kN and the basic static load rating C0 is 47 kN; the fatigue load limit Cur is 6.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RSTO50?", "a": "HR1 lists a limiting speed of 650 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RSTO50?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The 60 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RSTO50", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RSTO50", "RSTO50" ], "locale_variants": {} }, { "sku": "STO6-TV", "brand": "FAG", "manufacturer_designation": "STO6-TV", "series": "sto-series", "type": "support_roller", "d_mm": 6, "D_mm": 19, "B_mm": 9.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 3.75, "static_load_kN": 4.6, "fatigue_load_limit_kN": 0.66, "limiting_speed_rpm": 10000, "max_rpm": 10000, "weight_g": 17, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×19×9.8 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm bore — and the 9.8 mm width sets the contact width on the mating track the catalogue lists C 3.75 kN and C0 4.6 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.82 reflects a rolling-element pack sized for heavy static track loading, and the 6.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.66 kN at 6 mm bore, equivalent to 0.63 kN of dynamic rating per millimetre — the limiting speed is 10,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm bore takes the mounting pin or shaft; across the 9.8 mm contact width the dynamic rating works out to 0.38 kN per millimetre of rolling-element complement mass is 17 g, or 0.09 g per mm² of the 19×9.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 6 mm pin bore sits in the miniature band; at 9.8 mm wide the STO6-TV is built into compact cam drives, indexing pawls and light linkages The thick-walled 19 mm outer ring rolls directly on a flat track while the inner ring protects an ordinary machined pin from the needle-roller contact Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary The -TV cage is part of the speed story here: cage-guided kinematics permit the published 10,000 r/min limiting speed without roller-to-roller sliding. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 19 mm track diameter and 3.75 kN dynamic rating match the duty. In robotic arm linear axes the unit fits a compact 6 mm seat, and in agricultural and textile cam followers the 17 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 9.8 mm width and the published 4.6 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 19 mm outer ring does.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 19 mm outer ring does.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the STO6-TV?", "a": "The STO6-TV is a STO yoke-type track roller with inner ring, without axial guidance with 19 mm outside diameter, 6 mm bore and 9.8 mm width, envelope 6×19×9.8 mm. Mass is 17 g." }, { "q": "What does the STO6-TV designation mean in the FAG/INA HR1 catalogue?", "a": "STO6-TV identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×19×9.8 mm and the catalogue ratings are C 3.75 kN, C0 4.6 kN, Cur 0.66 kN." }, { "q": "What is the load capacity of the STO6-TV?", "a": "The basic dynamic load rating C is 3.75 kN and the basic static load rating C0 is 4.6 kN; the fatigue load limit Cur is 0.66 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO6-TV?", "a": "HR1 lists a limiting speed of 10,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO6-TV?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The inner ring lets the 6 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO6", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO6-TV", "STO6-TV" ], "locale_variants": {} }, { "sku": "STO8-TV", "brand": "FAG", "manufacturer_designation": "STO8-TV", "series": "sto-series", "type": "support_roller", "d_mm": 8, "D_mm": 24, "B_mm": 9.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 4.2, "static_load_kN": 5.6, "fatigue_load_limit_kN": 0.8, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 26, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×24×9.8 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm bore — and the 9.8 mm width sets the contact width on the mating track the catalogue lists C 4.2 kN and C0 5.6 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.75 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.8 kN at 8 mm bore, equivalent to 0.53 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm bore takes the mounting pin or shaft; across the 9.8 mm contact width the dynamic rating works out to 0.43 kN per millimetre of rolling-element complement mass is 26 g, or 0.11 g per mm² of the 24×9.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 8 mm pin bore sits in the miniature band; at 9.8 mm wide the STO8-TV is built into compact cam drives, indexing pawls and light linkages Reading STO: yoke roller with inner ring, no flanges; the 9.8 mm-wide unit is located laterally by housing shoulders or circlips rather than by integral ribs The thick-walled 24 mm outer ring rolls directly on a flat track while the inner ring protects an ordinary machined pin from the needle-roller contact Reading -TV: an injection-moulded polyamide cage guides the rolling elements — the lightweight choice that keeps the mass at 26 g in the 24 mm envelope. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 24 mm track diameter and 4.2 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 8 mm seat, and in packaging machine timing mechanisms the 26 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 9.8 mm width and the published 5.6 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 24 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the STO8-TV?", "a": "The STO8-TV is a STO yoke-type track roller with inner ring, without axial guidance with 24 mm outside diameter, 8 mm bore and 9.8 mm width, envelope 8×24×9.8 mm. Mass is 26 g." }, { "q": "What does the STO8-TV designation mean in the FAG/INA HR1 catalogue?", "a": "STO8-TV identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×24×9.8 mm and the catalogue ratings are C 4.2 kN, C0 5.6 kN, Cur 0.8 kN." }, { "q": "What is the load capacity of the STO8-TV?", "a": "The basic dynamic load rating C is 4.2 kN and the basic static load rating C0 is 5.6 kN; the fatigue load limit Cur is 0.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO8-TV?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO8-TV?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The inner ring lets the 8 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO8", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO8-TV", "STO8-TV" ], "locale_variants": {} }, { "sku": "STO10", "brand": "FAG", "manufacturer_designation": "STO10", "series": "sto-series", "type": "support_roller", "d_mm": 10, "D_mm": 30, "B_mm": 11.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.4, "static_load_kN": 9.5, "fatigue_load_limit_kN": 1.39, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 49, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×30×11.8 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 8.4 kN and C0 9.5 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.88 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.39 kN at 10 mm bore, equivalent to 0.84 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.71 kN per millimetre of rolling-element complement mass is 49 g, or 0.14 g per mm² of the 30×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 10 mm pin bore sits in the miniature band; at 11.8 mm wide the STO10 is built into compact cam drives, indexing pawls and light linkages At 49 g the roller suits small indexing and transfer mechanisms; without flanges a bent pin or angled track produces edge loading at the outer-ring lips Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 30 mm track diameter and 8.4 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 10 mm seat, and in woodworking machine feed tracks the 49 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 11.8 mm width and the published 9.5 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the STO10?", "a": "The STO10 is a STO yoke-type track roller with inner ring, without axial guidance with 30 mm outside diameter, 10 mm bore and 11.8 mm width, envelope 10×30×11.8 mm. Mass is 49 g." }, { "q": "What does the STO10 designation mean in the FAG/INA HR1 catalogue?", "a": "STO10 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×30×11.8 mm and the catalogue ratings are C 8.4 kN, C0 9.5 kN, Cur 1.39 kN." }, { "q": "What is the load capacity of the STO10?", "a": "The basic dynamic load rating C is 8.4 kN and the basic static load rating C0 is 9.5 kN; the fatigue load limit Cur is 1.39 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO10?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO10?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The inner ring lets the 10 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO10", "STO10" ], "locale_variants": {} }, { "sku": "STO12", "brand": "FAG", "manufacturer_designation": "STO12", "series": "sto-series", "type": "support_roller", "d_mm": 12, "D_mm": 32, "B_mm": 11.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9, "static_load_kN": 10.4, "fatigue_load_limit_kN": 1.56, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 57, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×32×11.8 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 9 kN and C0 10.4 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.87 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.56 kN at 12 mm bore, equivalent to 0.75 kN of dynamic rating per millimetre — the limiting speed is 4,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.76 kN per millimetre of rolling-element complement mass is 57 g, or 0.15 g per mm² of the 32×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 12 mm pin bore and only 57 g: the smallest sizes demand accurate shaft geometry, because the 10.0 mm section leaves no tolerance for a soft or tapered seat C 9 kN and C0 10.4 kN already account for outer-ring bending between supports; the limiting speed is 4,500 r/min with no reference speed given STO is the basic yoke-type track roller with inner ring and without axial guidance: it runs on a normal-tolerance pin through its 12 mm bore Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 32 mm track diameter and 9 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 12 mm seat, and in glass and ceramic line conveyors the 57 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 11.8 mm width and the published 10.4 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 32 mm outer ring does. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 32 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the STO12?", "a": "The STO12 is a STO yoke-type track roller with inner ring, without axial guidance with 32 mm outside diameter, 12 mm bore and 11.8 mm width, envelope 12×32×11.8 mm. Mass is 57 g." }, { "q": "What does the STO12 designation mean in the FAG/INA HR1 catalogue?", "a": "STO12 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×11.8 mm and the catalogue ratings are C 9 kN, C0 10.4 kN, Cur 1.56 kN." }, { "q": "What is the load capacity of the STO12?", "a": "The basic dynamic load rating C is 9 kN and the basic static load rating C0 is 10.4 kN; the fatigue load limit Cur is 1.56 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO12?", "a": "HR1 lists a limiting speed of 4,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO12?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The inner ring lets the 12 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO12", "STO12" ], "locale_variants": {} }, { "sku": "STO15", "brand": "FAG", "manufacturer_designation": "STO15", "series": "sto-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 11.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.1, "static_load_kN": 11.1, "fatigue_load_limit_kN": 1.67, "limiting_speed_rpm": 3300, "max_rpm": 3300, "weight_g": 63, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×11.8 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 9.1 kN and C0 11.1 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.82 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.67 kN at 15 mm bore, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 3,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.77 kN per millimetre of rolling-element complement mass is 63 g, or 0.15 g per mm² of the 35×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 15 mm pin bore the 11.8 mm width and 9.1 kN C rating suit high-cycle industrial machinery rather than instrument duty STO is the basic yoke-type track roller with inner ring and without axial guidance: it runs on a normal-tolerance pin through its 15 mm bore At 63 g the roller suits small indexing and transfer mechanisms; without flanges a bent pin or angled track produces edge loading at the outer-ring lips Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 35 mm track diameter and 9.1 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 15 mm seat, and in automotive welding jig rollers the 63 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 11.8 mm width and the published 11.1 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the STO15?", "a": "The STO15 is a STO yoke-type track roller with inner ring, without axial guidance with 35 mm outside diameter, 15 mm bore and 11.8 mm width, envelope 15×35×11.8 mm. Mass is 63 g." }, { "q": "What does the STO15 designation mean in the FAG/INA HR1 catalogue?", "a": "STO15 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×35×11.8 mm and the catalogue ratings are C 9.1 kN, C0 11.1 kN, Cur 1.67 kN." }, { "q": "What is the load capacity of the STO15?", "a": "The basic dynamic load rating C is 9.1 kN and the basic static load rating C0 is 11.1 kN; the fatigue load limit Cur is 1.67 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO15?", "a": "HR1 lists a limiting speed of 3,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO15?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO15", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO15", "STO15" ], "locale_variants": {} }, { "sku": "STO17", "brand": "FAG", "manufacturer_designation": "STO17", "series": "sto-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 15.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.2, "static_load_kN": 18.2, "fatigue_load_limit_kN": 2.55, "limiting_speed_rpm": 2800, "max_rpm": 2800, "weight_g": 107, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×15.8 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 14.2 kN and C0 18.2 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.55 kN at 17 mm bore, equivalent to 0.84 kN of dynamic rating per millimetre — the limiting speed is 2,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 0.90 kN per millimetre of rolling-element complement mass is 107 g, or 0.17 g per mm² of the 40×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 17 mm pin bore this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Reading STO: yoke roller with inner ring, no flanges; the 15.8 mm-wide unit is located laterally by housing shoulders or circlips rather than by integral ribs Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 40 mm track diameter and 14.2 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 17 mm seat, and in robotic arm linear axes the 107 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 15.8 mm width and the published 18.2 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the STO17?", "a": "The STO17 is a STO yoke-type track roller with inner ring, without axial guidance with 40 mm outside diameter, 17 mm bore and 15.8 mm width, envelope 17×40×15.8 mm. Mass is 107 g." }, { "q": "What does the STO17 designation mean in the FAG/INA HR1 catalogue?", "a": "STO17 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×40×15.8 mm and the catalogue ratings are C 14.2 kN, C0 18.2 kN, Cur 2.55 kN." }, { "q": "What is the load capacity of the STO17?", "a": "The basic dynamic load rating C is 14.2 kN and the basic static load rating C0 is 18.2 kN; the fatigue load limit Cur is 2.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO17?", "a": "HR1 lists a limiting speed of 2,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO17?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO17", "STO17" ], "locale_variants": {} }, { "sku": "STO20", "brand": "FAG", "manufacturer_designation": "STO20", "series": "sto-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 15.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.1, "static_load_kN": 22, "fatigue_load_limit_kN": 3.1, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 152, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×15.8 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 16.1 kN and C0 22 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.1 kN at 20 mm bore, equivalent to 0.81 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 1.02 kN per millimetre of rolling-element complement mass is 152 g, or 0.20 g per mm² of the 47×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm pin bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range STO rollers are used on cam tracks and rail guidance where sealing is handled externally; the open form is easy to relubricate through the pin where drilled Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 47 mm track diameter and 16.1 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 20 mm seat, and in conveyor transfer and diverting stations the 152 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 15.8 mm width and the published 22 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the STO20?", "a": "The STO20 is a STO yoke-type track roller with inner ring, without axial guidance with 47 mm outside diameter, 20 mm bore and 15.8 mm width, envelope 20×47×15.8 mm. Mass is 152 g." }, { "q": "What does the STO20 designation mean in the FAG/INA HR1 catalogue?", "a": "STO20 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×15.8 mm and the catalogue ratings are C 16.1 kN, C0 22 kN, Cur 3.1 kN." }, { "q": "What is the load capacity of the STO20?", "a": "The basic dynamic load rating C is 16.1 kN and the basic static load rating C0 is 22 kN; the fatigue load limit Cur is 3.1 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO20?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO20?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO20", "STO20" ], "locale_variants": {} }, { "sku": "STO25", "brand": "FAG", "manufacturer_designation": "STO25", "series": "sto-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.4, "static_load_kN": 23.5, "fatigue_load_limit_kN": 3.35, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 177, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×15.8 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 16.4 kN and C0 23.5 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.70 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.35 kN at 25 mm bore, equivalent to 0.66 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 1.04 kN per millimetre of rolling-element complement mass is 177 g, or 0.22 g per mm² of the 52×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 25 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 52 mm track diameter and 16.4 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 25 mm seat, and in cam drives and indexing tables the 177 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 15.8 mm width and the published 23.5 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the STO25?", "a": "The STO25 is a STO yoke-type track roller with inner ring, without axial guidance with 52 mm outside diameter, 25 mm bore and 15.8 mm width, envelope 25×52×15.8 mm. Mass is 177 g." }, { "q": "What does the STO25 designation mean in the FAG/INA HR1 catalogue?", "a": "STO25 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×15.8 mm and the catalogue ratings are C 16.4 kN, C0 23.5 kN, Cur 3.35 kN." }, { "q": "What is the load capacity of the STO25?", "a": "The basic dynamic load rating C is 16.4 kN and the basic static load rating C0 is 23.5 kN; the fatigue load limit Cur is 3.35 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO25?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO25?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO25", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO25", "STO25" ], "locale_variants": {} }, { "sku": "STO30", "brand": "FAG", "manufacturer_designation": "STO30", "series": "sto-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.1, "static_load_kN": 35.5, "fatigue_load_limit_kN": 4.8, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 308, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×19.8 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 23.1 kN and C0 35.5 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.65 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.8 kN at 30 mm bore, equivalent to 0.77 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.17 kN per millimetre of rolling-element complement mass is 308 g, or 0.25 g per mm² of the 62×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 30 mm pin bore the 19.8 mm width and 23.1 kN C rating suit high-cycle industrial machinery rather than instrument duty Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 62 mm track diameter and 23.1 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 30 mm seat, and in printing press sheet-transfer grippers the 308 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 19.8 mm width and the published 35.5 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the STO30?", "a": "The STO30 is a STO yoke-type track roller with inner ring, without axial guidance with 62 mm outside diameter, 30 mm bore and 19.8 mm width, envelope 30×62×19.8 mm. Mass is 308 g." }, { "q": "What does the STO30 designation mean in the FAG/INA HR1 catalogue?", "a": "STO30 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×62×19.8 mm and the catalogue ratings are C 23.1 kN, C0 35.5 kN, Cur 4.8 kN." }, { "q": "What is the load capacity of the STO30?", "a": "The basic dynamic load rating C is 23.1 kN and the basic static load rating C0 is 35.5 kN; the fatigue load limit Cur is 4.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO30?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO30?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO30", "STO30" ], "locale_variants": {} }, { "sku": "STO35", "brand": "FAG", "manufacturer_designation": "STO35", "series": "sto-series", "type": "support_roller", "d_mm": 35, "D_mm": 72, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25, "static_load_kN": 41, "fatigue_load_limit_kN": 5.5, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 441, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×72×19.8 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25 kN and C0 41 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.61 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.5 kN at 35 mm bore, equivalent to 0.71 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.26 kN per millimetre of rolling-element complement mass is 441 g, or 0.31 g per mm² of the 72×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 35 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 19.8 mm width as a standard mounting space STO rollers are used on cam tracks and rail guidance where sealing is handled externally; the open form is easy to relubricate through the pin where drilled At 441 g the roller suits small indexing and transfer mechanisms; without flanges a bent pin or angled track produces edge loading at the outer-ring lips Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 72 mm track diameter and 25 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 35 mm seat, and in conveyor transfer and diverting stations the 441 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 19.8 mm width and the published 41 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the STO35?", "a": "The STO35 is a STO yoke-type track roller with inner ring, without axial guidance with 72 mm outside diameter, 35 mm bore and 19.8 mm width, envelope 35×72×19.8 mm. Mass is 441 g." }, { "q": "What does the STO35 designation mean in the FAG/INA HR1 catalogue?", "a": "STO35 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 35×72×19.8 mm and the catalogue ratings are C 25 kN, C0 41 kN, Cur 5.5 kN." }, { "q": "What is the load capacity of the STO35?", "a": "The basic dynamic load rating C is 25 kN and the basic static load rating C0 is 41 kN; the fatigue load limit Cur is 5.5 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO35?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO35?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO35", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO35", "STO35" ], "locale_variants": {} }, { "sku": "STO40", "brand": "FAG", "manufacturer_designation": "STO40", "series": "sto-series", "type": "support_roller", "d_mm": 40, "D_mm": 80, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.7, "static_load_kN": 40, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×80×19.8 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 23.7 kN and C0 40 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 40 mm bore, equivalent to 0.59 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.20 kN per millimetre of rolling-element complement mass is 530 g, or 0.33 g per mm² of the 80×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 40 mm pin bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons C 23.7 kN and C0 40 kN already account for outer-ring bending between supports; the limiting speed is 850 r/min with no reference speed given Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 80 mm track diameter and 23.7 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 40 mm seat, and in robotic arm linear axes the 530 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 19.8 mm width and the published 40 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the STO40?", "a": "The STO40 is a STO yoke-type track roller with inner ring, without axial guidance with 80 mm outside diameter, 40 mm bore and 19.8 mm width, envelope 40×80×19.8 mm. Mass is 530 g." }, { "q": "What does the STO40 designation mean in the FAG/INA HR1 catalogue?", "a": "STO40 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 40×80×19.8 mm and the catalogue ratings are C 23.7 kN, C0 40 kN, Cur 6 kN." }, { "q": "What is the load capacity of the STO40?", "a": "The basic dynamic load rating C is 23.7 kN and the basic static load rating C0 is 40 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO40?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO40?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO40", "STO40" ], "locale_variants": {} }, { "sku": "STO45", "brand": "FAG", "manufacturer_designation": "STO45", "series": "sto-series", "type": "support_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25, "static_load_kN": 44, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 576, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×85×19.8 mm: the 85 mm outside diameter is the track-running surface — a thick-walled outer ring over a 45 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25 kN and C0 44 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.57 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 45 mm bore, equivalent to 0.56 kN of dynamic rating per millimetre — the limiting speed is 750 r/min and, as for HR1 track rollers, no thermal reference speed is published the 45 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.26 kN per millimetre of rolling-element complement mass is 576 g, or 0.34 g per mm² of the 85×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 45 mm pin bore marks the medium range: mounting forces and fits become critical, and the 576 g mass calls for proper induction or press tooling rather than hand fitting Reading STO: yoke roller with inner ring, no flanges; the 19.8 mm-wide unit is located laterally by housing shoulders or circlips rather than by integral ribs Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 85 mm track diameter and 25 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 45 mm seat, and in printing press sheet-transfer grippers the 576 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 19.8 mm width and the published 44 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the STO45?", "a": "The STO45 is a STO yoke-type track roller with inner ring, without axial guidance with 85 mm outside diameter, 45 mm bore and 19.8 mm width, envelope 45×85×19.8 mm. Mass is 576 g." }, { "q": "What does the STO45 designation mean in the FAG/INA HR1 catalogue?", "a": "STO45 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 45×85×19.8 mm and the catalogue ratings are C 25 kN, C0 44 kN, Cur 6 kN." }, { "q": "What is the load capacity of the STO45?", "a": "The basic dynamic load rating C is 25 kN and the basic static load rating C0 is 44 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO45?", "a": "HR1 lists a limiting speed of 750 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO45?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 85 mm outer surface tolerates only small angular error. The inner ring lets the 45 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO45", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO45", "STO45" ], "locale_variants": {} }, { "sku": "STO50", "brand": "FAG", "manufacturer_designation": "STO50", "series": "sto-series", "type": "support_roller", "d_mm": 50, "D_mm": 90, "B_mm": 19.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 25.5, "static_load_kN": 47, "fatigue_load_limit_kN": 6.4, "limiting_speed_rpm": 650, "max_rpm": 650, "weight_g": 617, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×90×19.8 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 25.5 kN and C0 47 kN for the STO yoke-type track roller with inner ring, without axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6.4 kN at 50 mm bore, equivalent to 0.51 kN of dynamic rating per millimetre — the limiting speed is 650 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 1.29 kN per millimetre of rolling-element complement mass is 617 g, or 0.35 g per mm² of the 90×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 50 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 19.8 mm width as a standard mounting space Reading STO: yoke roller with inner ring, no flanges; the 19.8 mm-wide unit is located laterally by housing shoulders or circlips rather than by integral ribs Because the inner ring is supplied, the mounting pin only needs standard bearing-seat tolerance and surface — hardening to raceway quality is unnecessary Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 90 mm track diameter and 25.5 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 50 mm seat, and in glass and ceramic line conveyors the 617 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 19.8 mm width and the published 47 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the STO50?", "a": "The STO50 is a STO yoke-type track roller with inner ring, without axial guidance with 90 mm outside diameter, 50 mm bore and 19.8 mm width, envelope 50×90×19.8 mm. Mass is 617 g." }, { "q": "What does the STO50 designation mean in the FAG/INA HR1 catalogue?", "a": "STO50 identifies this STO yoke-type track roller with inner ring, without axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 50×90×19.8 mm and the catalogue ratings are C 25.5 kN, C0 47 kN, Cur 6.4 kN." }, { "q": "What is the load capacity of the STO50?", "a": "The basic dynamic load rating C is 25.5 kN and the basic static load rating C0 is 47 kN; the fatigue load limit Cur is 6.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the STO50?", "a": "HR1 lists a limiting speed of 650 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the STO50?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "STO50", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1448", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "STO50", "STO50" ], "locale_variants": {} }, { "sku": "RNA22-6-2RSR", "brand": "FAG", "manufacturer_designation": "RNA22/6-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 10, "D_mm": 19, "B_mm": 11.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.9, "static_load_kN": 3.7, "fatigue_load_limit_kN": 0.495, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 18, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×19×11.8 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 3.9 kN and C0 3.7 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 1.05 reflects a rolling-element pack sized for heavy static track loading, and the 4.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.495 kN at 10 mm bore, equivalent to 0.39 kN of dynamic rating per millimetre — the limiting speed is 9,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.33 kN per millimetre of rolling-element complement mass is 18 g, or 0.08 g per mm² of the 19×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 10 mm pin bore and only 18 g: the smallest sizes demand accurate shaft geometry, because the 4.5 mm section leaves no tolerance for a soft or tapered seat C 3.9 kN, C0 3.7 kN and Cur 0.495 kN are the track-load ratings; the sealed lips reduce the limiting speed to 9,000 r/min Choose RNA22 over RSTO where the environment carries abrasives: the 2RSR lips protect the needle complement but cannot be inspected or replaced without scrapping the unit Reading the suffix: 2RSR is the FAG/INA code for rubbing lip seals at both faces, making the 10 mm-bore unit greased for life. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 19 mm track diameter and 3.9 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 10 mm seat, and in robotic arm linear axes the 18 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 11.8 mm width and the published 3.7 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the RNA22/6-2RSR?", "a": "The RNA22/6-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 19 mm outside diameter, 10 mm bore and 11.8 mm width, envelope 10×19×11.8 mm. Mass is 18 g." }, { "q": "What does the RNA22/6-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA22/6-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×19×11.8 mm and the catalogue ratings are C 3.9 kN, C0 3.7 kN, Cur 0.495 kN." }, { "q": "What is the load capacity of the RNA22/6-2RSR?", "a": "The basic dynamic load rating C is 3.9 kN and the basic static load rating C0 is 3.7 kN; the fatigue load limit Cur is 0.495 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA22/6-2RSR?", "a": "HR1 lists a limiting speed of 9,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA22/6-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The 10 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA22", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA22-6-2RSR", "RNA22/6-2RSR" ], "locale_variants": {} }, { "sku": "RNA22-8-2RSR", "brand": "FAG", "manufacturer_designation": "RNA22/8-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 12, "D_mm": 24, "B_mm": 11.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.8, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.65, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 29, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×24×11.8 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 4.8 kN and C0 4.3 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 1.12 reflects a rolling-element pack sized for heavy static track loading, and the 6.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.65 kN at 12 mm bore, equivalent to 0.40 kN of dynamic rating per millimetre — the limiting speed is 7,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.41 kN per millimetre of rolling-element complement mass is 29 g, or 0.10 g per mm² of the 24×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 12 mm pin bore sits in the miniature band; at 11.8 mm wide the RNA22/8-2RSR is built into compact cam drives, indexing pawls and light linkages Choose RNA22 over RSTO where the environment carries abrasives: the 2RSR lips protect the needle complement but cannot be inspected or replaced without scrapping the unit No axial guidance is built in, so the yoke structure must locate the 29 roller laterally; the crowned outer surface tolerates only small track skew 2RSR means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 7,000 r/min. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 24 mm track diameter and 4.8 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 12 mm seat, and in robotic arm linear axes the 29 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 11.8 mm width and the published 4.3 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the RNA22/8-2RSR?", "a": "The RNA22/8-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 24 mm outside diameter, 12 mm bore and 11.8 mm width, envelope 12×24×11.8 mm. Mass is 29 g." }, { "q": "What does the RNA22/8-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA22/8-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×24×11.8 mm and the catalogue ratings are C 4.8 kN, C0 4.3 kN, Cur 0.65 kN." }, { "q": "What is the load capacity of the RNA22/8-2RSR?", "a": "The basic dynamic load rating C is 4.8 kN and the basic static load rating C0 is 4.3 kN; the fatigue load limit Cur is 0.65 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA22/8-2RSR?", "a": "HR1 lists a limiting speed of 7,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA22/8-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The 12 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA22", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA22-8-2RSR", "RNA22/8-2RSR" ], "locale_variants": {} }, { "sku": "RNA2200-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2200-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 14, "D_mm": 30, "B_mm": 13.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7, "static_load_kN": 6.9, "fatigue_load_limit_kN": 1.12, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 52, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 14×30×13.8 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 14 mm bore — and the 13.8 mm width sets the contact width on the mating track the catalogue lists C 7 kN and C0 6.9 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 1.01 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.12 kN at 14 mm bore, equivalent to 0.50 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 14 mm bore takes the mounting pin or shaft; across the 13.8 mm contact width the dynamic rating works out to 0.51 kN per millimetre of rolling-element complement mass is 52 g, or 0.13 g per mm² of the 30×13.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 14 mm pin bore this size balances the 30 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading RNA22..2RSR: flangeless yoke roller, sealed for life on both sides, no inner ring; the 13.8 mm width includes the seal recesses RNA22 is the sealed yoke-type track roller without inner ring: 2RSR contact seals on both sides retain the factory grease and exclude dust, and the needles run on a hardened pin 2RSR means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 5,500 r/min. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 30 mm track diameter and 7 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 14 mm seat, and in glass and ceramic line conveyors the 52 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 13.8 mm width and the published 6.9 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the RNA2200-2RSR?", "a": "The RNA2200-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 30 mm outside diameter, 14 mm bore and 13.8 mm width, envelope 14×30×13.8 mm. Mass is 52 g." }, { "q": "What does the RNA2200-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2200-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 14×30×13.8 mm and the catalogue ratings are C 7 kN, C0 6.9 kN, Cur 1.12 kN." }, { "q": "What is the load capacity of the RNA2200-2RSR?", "a": "The basic dynamic load rating C is 7 kN and the basic static load rating C0 is 6.9 kN; the fatigue load limit Cur is 1.12 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2200-2RSR?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2200-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The 14 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2200-2RSR", "RNA2200-2RSR" ], "locale_variants": {} }, { "sku": "RNA2201-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2201-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 16, "D_mm": 32, "B_mm": 13.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.5, "static_load_kN": 8.3, "fatigue_load_limit_kN": 1.29, "limiting_speed_rpm": 4700, "max_rpm": 4700, "weight_g": 57, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×32×13.8 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm bore — and the 13.8 mm width sets the contact width on the mating track the catalogue lists C 7.5 kN and C0 8.3 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.90 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.29 kN at 16 mm bore, equivalent to 0.47 kN of dynamic rating per millimetre — the limiting speed is 4,700 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm bore takes the mounting pin or shaft; across the 13.8 mm contact width the dynamic rating works out to 0.54 kN per millimetre of rolling-element complement mass is 57 g, or 0.13 g per mm² of the 32×13.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 16 mm pin bore the 13.8 mm width and 7.5 kN C rating suit high-cycle industrial machinery rather than instrument duty Choose RNA22 over RSTO where the environment carries abrasives: the 2RSR lips protect the needle complement but cannot be inspected or replaced without scrapping the unit Reading RNA22..2RSR: flangeless yoke roller, sealed for life on both sides, no inner ring; the 13.8 mm width includes the seal recesses The sealed 2RSR execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 32 mm track diameter and 7.5 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 16 mm seat, and in glass and ceramic line conveyors the 57 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 13.8 mm width and the published 8.3 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the RNA2201-2RSR?", "a": "The RNA2201-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 32 mm outside diameter, 16 mm bore and 13.8 mm width, envelope 16×32×13.8 mm. Mass is 57 g." }, { "q": "What does the RNA2201-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2201-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×32×13.8 mm and the catalogue ratings are C 7.5 kN, C0 8.3 kN, Cur 1.29 kN." }, { "q": "What is the load capacity of the RNA2201-2RSR?", "a": "The basic dynamic load rating C is 7.5 kN and the basic static load rating C0 is 8.3 kN; the fatigue load limit Cur is 1.29 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2201-2RSR?", "a": "HR1 lists a limiting speed of 4,700 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2201-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The 16 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2201-2RSR", "RNA2201-2RSR" ], "locale_variants": {} }, { "sku": "RNA2202-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2202-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 20, "D_mm": 35, "B_mm": 13.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.6, "static_load_kN": 9.9, "fatigue_load_limit_kN": 1.39, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 60, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×35×13.8 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 13.8 mm width sets the contact width on the mating track the catalogue lists C 7.6 kN and C0 9.9 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.77 reflects a rolling-element pack sized for heavy static track loading, and the 7.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.39 kN at 20 mm bore, equivalent to 0.38 kN of dynamic rating per millimetre — the limiting speed is 3,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 13.8 mm contact width the dynamic rating works out to 0.55 kN per millimetre of rolling-element complement mass is 60 g, or 0.12 g per mm² of the 35×13.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty C 7.6 kN, C0 9.9 kN and Cur 1.39 kN are the track-load ratings; the sealed lips reduce the limiting speed to 3,400 r/min The sealed pack is greased for life — additional lubrication is neither possible nor required, and the roller suits dirty positions with no maintenance access The 2RSR suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 35 mm outer ring. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 35 mm track diameter and 7.6 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 20 mm seat, and in glass and ceramic line conveyors the 60 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 13.8 mm width and the published 9.9 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the RNA2202-2RSR?", "a": "The RNA2202-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 35 mm outside diameter, 20 mm bore and 13.8 mm width, envelope 20×35×13.8 mm. Mass is 60 g." }, { "q": "What does the RNA2202-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2202-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×35×13.8 mm and the catalogue ratings are C 7.6 kN, C0 9.9 kN, Cur 1.39 kN." }, { "q": "What is the load capacity of the RNA2202-2RSR?", "a": "The basic dynamic load rating C is 7.6 kN and the basic static load rating C0 is 9.9 kN; the fatigue load limit Cur is 1.39 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2202-2RSR?", "a": "HR1 lists a limiting speed of 3,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2202-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The 20 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2202-2RSR", "RNA2202-2RSR" ], "locale_variants": {} }, { "sku": "RNA2203-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2203-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 22, "D_mm": 40, "B_mm": 15.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.9, "static_load_kN": 14.2, "fatigue_load_limit_kN": 1.87, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 94, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 22×40×15.8 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 22 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 9.9 kN and C0 14.2 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.70 reflects a rolling-element pack sized for heavy static track loading, and the 9.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.87 kN at 22 mm bore, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 3,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 22 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 0.63 kN per millimetre of rolling-element complement mass is 94 g, or 0.15 g per mm² of the 40×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 22 mm pin bore this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 40 mm crowned-profile thick-walled outer ring runs on the track; at 22 mm the pin seat must still be hardened to 58–64 HRC despite the sealed execution RNA22 is the sealed yoke-type track roller without inner ring: 2RSR contact seals on both sides retain the factory grease and exclude dust, and the needles run on a hardened pin Reading the suffix: 2RSR is the FAG/INA code for rubbing lip seals at both faces, making the 22 mm-bore unit greased for life. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 40 mm track diameter and 9.9 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 22 mm seat, and in glass and ceramic line conveyors the 94 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 15.8 mm width and the published 14.2 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 40 mm outer ring does.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 40 mm outer ring does.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the RNA2203-2RSR?", "a": "The RNA2203-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 40 mm outside diameter, 22 mm bore and 15.8 mm width, envelope 22×40×15.8 mm. Mass is 94 g." }, { "q": "What does the RNA2203-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2203-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 22×40×15.8 mm and the catalogue ratings are C 9.9 kN, C0 14.2 kN, Cur 1.87 kN." }, { "q": "What is the load capacity of the RNA2203-2RSR?", "a": "The basic dynamic load rating C is 9.9 kN and the basic static load rating C0 is 14.2 kN; the fatigue load limit Cur is 1.87 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2203-2RSR?", "a": "HR1 lists a limiting speed of 3,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2203-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The 22 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2203-2RSR", "RNA2203-2RSR" ], "locale_variants": {} }, { "sku": "RNA2204-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2204-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 25, "D_mm": 47, "B_mm": 17.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14, "static_load_kN": 19.3, "fatigue_load_limit_kN": 2.7, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 152, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×47×17.8 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 17.8 mm width sets the contact width on the mating track the catalogue lists C 14 kN and C0 19.3 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.7 kN at 25 mm bore, equivalent to 0.56 kN of dynamic rating per millimetre — the limiting speed is 2,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 17.8 mm contact width the dynamic rating works out to 0.79 kN per millimetre of rolling-element complement mass is 152 g, or 0.18 g per mm² of the 47×17.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 25 mm pin bore the 17.8 mm width and 14 kN C rating suit high-cycle industrial machinery rather than instrument duty C 14 kN, C0 19.3 kN and Cur 2.7 kN are the track-load ratings; the sealed lips reduce the limiting speed to 2,300 r/min RNA22 is the sealed yoke-type track roller without inner ring: 2RSR contact seals on both sides retain the factory grease and exclude dust, and the needles run on a hardened pin With 2RSR seals the 152 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 47 mm track diameter and 14 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 25 mm seat, and in glass and ceramic line conveyors the 152 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 17.8 mm width and the published 19.3 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 47 mm outer ring does. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 47 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the RNA2204-2RSR?", "a": "The RNA2204-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 47 mm outside diameter, 25 mm bore and 17.8 mm width, envelope 25×47×17.8 mm. Mass is 152 g." }, { "q": "What does the RNA2204-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2204-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×47×17.8 mm and the catalogue ratings are C 14 kN, C0 19.3 kN, Cur 2.7 kN." }, { "q": "What is the load capacity of the RNA2204-2RSR?", "a": "The basic dynamic load rating C is 14 kN and the basic static load rating C0 is 19.3 kN; the fatigue load limit Cur is 2.7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2204-2RSR?", "a": "HR1 lists a limiting speed of 2,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2204-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The 25 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2204-2RSR", "RNA2204-2RSR" ], "locale_variants": {} }, { "sku": "RNA2205-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2205-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 30, "D_mm": 52, "B_mm": 17.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.4, "static_load_kN": 21.1, "fatigue_load_limit_kN": 2.95, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 179, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×52×17.8 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 17.8 mm width sets the contact width on the mating track the catalogue lists C 14.4 kN and C0 21.1 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.95 kN at 30 mm bore, equivalent to 0.48 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 17.8 mm contact width the dynamic rating works out to 0.81 kN per millimetre of rolling-element complement mass is 179 g, or 0.19 g per mm² of the 52×17.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The 52 mm crowned-profile thick-walled outer ring runs on the track; at 30 mm the pin seat must still be hardened to 58–64 HRC despite the sealed execution C 14.4 kN, C0 21.1 kN and Cur 2.95 kN are the track-load ratings; the sealed lips reduce the limiting speed to 1,800 r/min 2RSR means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 1,800 r/min. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 52 mm track diameter and 14.4 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 30 mm seat, and in glass and ceramic line conveyors the 179 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 17.8 mm width and the published 21.1 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the RNA2205-2RSR?", "a": "The RNA2205-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 52 mm outside diameter, 30 mm bore and 17.8 mm width, envelope 30×52×17.8 mm. Mass is 179 g." }, { "q": "What does the RNA2205-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2205-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×52×17.8 mm and the catalogue ratings are C 14.4 kN, C0 21.1 kN, Cur 2.95 kN." }, { "q": "What is the load capacity of the RNA2205-2RSR?", "a": "The basic dynamic load rating C is 14.4 kN and the basic static load rating C0 is 21.1 kN; the fatigue load limit Cur is 2.95 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2205-2RSR?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2205-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The 30 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2205-2RSR", "RNA2205-2RSR" ], "locale_variants": {} }, { "sku": "RNA2206-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2206-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 35, "D_mm": 62, "B_mm": 19.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 17, "static_load_kN": 26.5, "fatigue_load_limit_kN": 3.6, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 284, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×62×19.8 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 17 kN and C0 26.5 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.64 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.6 kN at 35 mm bore, equivalent to 0.49 kN of dynamic rating per millimetre — the limiting speed is 1,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 0.86 kN per millimetre of rolling-element complement mass is 284 g, or 0.23 g per mm² of the 62×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 35 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 19.8 mm width as a standard mounting space Choose RNA22 over RSTO where the environment carries abrasives: the 2RSR lips protect the needle complement but cannot be inspected or replaced without scrapping the unit The sealed 2RSR execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 62 mm track diameter and 17 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 35 mm seat, and in glass and ceramic line conveyors the 284 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 19.8 mm width and the published 26.5 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the RNA2206-2RSR?", "a": "The RNA2206-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 62 mm outside diameter, 35 mm bore and 19.8 mm width, envelope 35×62×19.8 mm. Mass is 284 g." }, { "q": "What does the RNA2206-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2206-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 35×62×19.8 mm and the catalogue ratings are C 17 kN, C0 26.5 kN, Cur 3.6 kN." }, { "q": "What is the load capacity of the RNA2206-2RSR?", "a": "The basic dynamic load rating C is 17 kN and the basic static load rating C0 is 26.5 kN; the fatigue load limit Cur is 3.6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2206-2RSR?", "a": "HR1 lists a limiting speed of 1,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2206-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The 35 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2206-2RSR", "RNA2206-2RSR" ], "locale_variants": {} }, { "sku": "RNA2207-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2207-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 42, "D_mm": 72, "B_mm": 22.7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 5.3, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 432, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 42×72×22.7 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 42 mm bore — and the 22.7 mm width sets the contact width on the mating track the catalogue lists C 21.5 kN and C0 36.5 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.3 kN at 42 mm bore, equivalent to 0.51 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 42 mm bore takes the mounting pin or shaft; across the 22.7 mm contact width the dynamic rating works out to 0.95 kN per millimetre of rolling-element complement mass is 432 g, or 0.26 g per mm² of the 72×22.7 mm track envelope — inertia that the drive must accelerate on every index of the cam 42 mm pin bore marks the medium range: mounting forces and fits become critical, and the 432 g mass calls for proper induction or press tooling rather than hand fitting C 21.5 kN, C0 36.5 kN and Cur 5.3 kN are the track-load ratings; the sealed lips reduce the limiting speed to 1,100 r/min The 72 mm crowned-profile thick-walled outer ring runs on the track; at 42 mm the pin seat must still be hardened to 58–64 HRC despite the sealed execution The 2RSR suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 72 mm outer ring. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 72 mm track diameter and 21.5 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 42 mm seat, and in glass and ceramic line conveyors the 432 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 22.7 mm width and the published 36.5 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 72 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the RNA2207-2RSR?", "a": "The RNA2207-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 72 mm outside diameter, 42 mm bore and 22.7 mm width, envelope 42×72×22.7 mm. Mass is 432 g." }, { "q": "What does the RNA2207-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2207-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 42×72×22.7 mm and the catalogue ratings are C 21.5 kN, C0 36.5 kN, Cur 5.3 kN." }, { "q": "What is the load capacity of the RNA2207-2RSR?", "a": "The basic dynamic load rating C is 21.5 kN and the basic static load rating C0 is 36.5 kN; the fatigue load limit Cur is 5.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2207-2RSR?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2207-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The 42 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2207-2RSR", "RNA2207-2RSR" ], "locale_variants": {} }, { "sku": "RNA2208-2RSR", "brand": "FAG", "manufacturer_designation": "RNA2208-2RSR", "series": "rna22-series", "type": "support_roller", "d_mm": 48, "D_mm": 80, "B_mm": 22.7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 41.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 48×80×22.7 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 48 mm bore — and the 22.7 mm width sets the contact width on the mating track the catalogue lists C 26 kN and C0 41.5 kN for the RNA22 sealed yoke-type track roller without inner ring; the C/C0 ratio of 0.63 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.4 kN at 48 mm bore, equivalent to 0.54 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 48 mm bore takes the mounting pin or shaft; across the 22.7 mm contact width the dynamic rating works out to 1.15 kN per millimetre of rolling-element complement mass is 530 g, or 0.29 g per mm² of the 80×22.7 mm track envelope — inertia that the drive must accelerate on every index of the cam the 48 mm pin bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons Choose RNA22 over RSTO where the environment carries abrasives: the 2RSR lips protect the needle complement but cannot be inspected or replaced without scrapping the unit Reading RNA22..2RSR: flangeless yoke roller, sealed for life on both sides, no inner ring; the 22.7 mm width includes the seal recesses Reading the suffix: 2RSR is the FAG/INA code for rubbing lip seals at both faces, making the 48 mm-bore unit greased for life. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 80 mm track diameter and 26 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 48 mm seat, and in glass and ceramic line conveyors the 530 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 22.7 mm width and the published 41.5 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the RNA2208-2RSR?", "a": "The RNA2208-2RSR is a RNA22 sealed yoke-type track roller without inner ring with 80 mm outside diameter, 48 mm bore and 22.7 mm width, envelope 48×80×22.7 mm. Mass is 530 g." }, { "q": "What does the RNA2208-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "RNA2208-2RSR identifies this RNA22 sealed yoke-type track roller without inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 48×80×22.7 mm and the catalogue ratings are C 26 kN, C0 41.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the RNA2208-2RSR?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 5.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the RNA2208-2RSR?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the RNA2208-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The 48 mm pin must be hardened to 58–64 HRC and ground like a raceway; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "RNA2208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "RNA2208-2RSR", "RNA2208-2RSR" ], "locale_variants": {} }, { "sku": "NA22-6-2RSR", "brand": "FAG", "manufacturer_designation": "NA22/6-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 6, "D_mm": 19, "B_mm": 11.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.9, "static_load_kN": 3.7, "fatigue_load_limit_kN": 0.495, "limiting_speed_rpm": 9000, "max_rpm": 9000, "weight_g": 22, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×19×11.8 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 3.9 kN and C0 3.7 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 1.05 reflects a rolling-element pack sized for heavy static track loading, and the 6.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.495 kN at 6 mm bore, equivalent to 0.65 kN of dynamic rating per millimetre — the limiting speed is 9,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.33 kN per millimetre of rolling-element complement mass is 22 g, or 0.10 g per mm² of the 19×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm pin bore and only 22 g: the smallest sizes demand accurate shaft geometry, because the 6.5 mm section leaves no tolerance for a soft or tapered seat NA22 is the sealed yoke-type track roller with inner ring: 2RSR contact seals on both sides and a 6 mm bore for an ordinary mounting pin Typical positions are conveyor diverts, packaging cams and textile machines where 22 g maintenance-free rollers replace plain-bushed followers 2RSR means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 9,000 r/min. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 19 mm track diameter and 3.9 kN dynamic rating match the duty. In robotic arm linear axes the unit fits a compact 6 mm seat, and in agricultural and textile cam followers the 22 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 11.8 mm width and the published 3.7 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NA22/6-2RSR?", "a": "The NA22/6-2RSR is a NA22 sealed yoke-type track roller with inner ring with 19 mm outside diameter, 6 mm bore and 11.8 mm width, envelope 6×19×11.8 mm. Mass is 22 g." }, { "q": "What does the NA22/6-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA22/6-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×19×11.8 mm and the catalogue ratings are C 3.9 kN, C0 3.7 kN, Cur 0.495 kN." }, { "q": "What is the load capacity of the NA22/6-2RSR?", "a": "The basic dynamic load rating C is 3.9 kN and the basic static load rating C0 is 3.7 kN; the fatigue load limit Cur is 0.495 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA22/6-2RSR?", "a": "HR1 lists a limiting speed of 9,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA22/6-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The inner ring lets the 6 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA22", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA22-6-2RSR", "NA22/6-2RSR" ], "locale_variants": {} }, { "sku": "NA22-8-2RSR", "brand": "FAG", "manufacturer_designation": "NA22/8-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 8, "D_mm": 24, "B_mm": 11.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.8, "static_load_kN": 4.3, "fatigue_load_limit_kN": 0.65, "limiting_speed_rpm": 7000, "max_rpm": 7000, "weight_g": 34, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×24×11.8 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm bore — and the 11.8 mm width sets the contact width on the mating track the catalogue lists C 4.8 kN and C0 4.3 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 1.12 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.65 kN at 8 mm bore, equivalent to 0.60 kN of dynamic rating per millimetre — the limiting speed is 7,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm bore takes the mounting pin or shaft; across the 11.8 mm contact width the dynamic rating works out to 0.41 kN per millimetre of rolling-element complement mass is 34 g, or 0.12 g per mm² of the 24×11.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 8 mm pin bore sits in the miniature band; at 11.8 mm wide the NA22/8-2RSR is built into compact cam drives, indexing pawls and light linkages The thick-walled 24 mm outer ring with crowned profile runs on flat or slightly imperfect tracks, greased for life behind the two side seals With 2RSR seals the 34 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 24 mm track diameter and 4.8 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 8 mm seat, and in automatic assembly machine carriages the 34 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 11.8 mm width and the published 4.3 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 24 mm outer ring does.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 24 mm outer ring does.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NA22/8-2RSR?", "a": "The NA22/8-2RSR is a NA22 sealed yoke-type track roller with inner ring with 24 mm outside diameter, 8 mm bore and 11.8 mm width, envelope 8×24×11.8 mm. Mass is 34 g." }, { "q": "What does the NA22/8-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA22/8-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×24×11.8 mm and the catalogue ratings are C 4.8 kN, C0 4.3 kN, Cur 0.65 kN." }, { "q": "What is the load capacity of the NA22/8-2RSR?", "a": "The basic dynamic load rating C is 4.8 kN and the basic static load rating C0 is 4.3 kN; the fatigue load limit Cur is 0.65 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA22/8-2RSR?", "a": "HR1 lists a limiting speed of 7,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA22/8-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The inner ring lets the 8 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA22", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA22-8-2RSR", "NA22/8-2RSR" ], "locale_variants": {} }, { "sku": "NA2200-2RSR", "brand": "FAG", "manufacturer_designation": "NA2200-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 10, "D_mm": 30, "B_mm": 13.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7, "static_load_kN": 6.9, "fatigue_load_limit_kN": 1.12, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 60, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×30×13.8 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 13.8 mm width sets the contact width on the mating track the catalogue lists C 7 kN and C0 6.9 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 1.01 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.12 kN at 10 mm bore, equivalent to 0.70 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 13.8 mm contact width the dynamic rating works out to 0.51 kN per millimetre of rolling-element complement mass is 60 g, or 0.14 g per mm² of the 30×13.8 mm track envelope — inertia that the drive must accelerate on every index of the cam 10 mm pin bore and only 60 g: the smallest sizes demand accurate shaft geometry, because the 10.0 mm section leaves no tolerance for a soft or tapered seat C 7 kN and C0 6.9 kN cover the supported-track bending case; the contact seals set the limiting speed at 5,500 r/min Reading NA22..2RSR: sealed flangeless yoke roller with inner ring; the 13.8 mm-wide unit needs lateral location from the adjacent structure With 2RSR seals the 60 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 30 mm track diameter and 7 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 10 mm seat, and in packaging machine timing mechanisms the 60 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 13.8 mm width and the published 6.9 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NA2200-2RSR?", "a": "The NA2200-2RSR is a NA22 sealed yoke-type track roller with inner ring with 30 mm outside diameter, 10 mm bore and 13.8 mm width, envelope 10×30×13.8 mm. Mass is 60 g." }, { "q": "What does the NA2200-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2200-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×30×13.8 mm and the catalogue ratings are C 7 kN, C0 6.9 kN, Cur 1.12 kN." }, { "q": "What is the load capacity of the NA2200-2RSR?", "a": "The basic dynamic load rating C is 7 kN and the basic static load rating C0 is 6.9 kN; the fatigue load limit Cur is 1.12 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2200-2RSR?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2200-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The inner ring lets the 10 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2200", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2200-2RSR", "NA2200-2RSR" ], "locale_variants": {} }, { "sku": "NA2201-2RSR", "brand": "FAG", "manufacturer_designation": "NA2201-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 12, "D_mm": 32, "B_mm": 13.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.5, "static_load_kN": 8.3, "fatigue_load_limit_kN": 1.29, "limiting_speed_rpm": 4700, "max_rpm": 4700, "weight_g": 67, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×32×13.8 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 13.8 mm width sets the contact width on the mating track the catalogue lists C 7.5 kN and C0 8.3 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.90 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.29 kN at 12 mm bore, equivalent to 0.63 kN of dynamic rating per millimetre — the limiting speed is 4,700 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 13.8 mm contact width the dynamic rating works out to 0.54 kN per millimetre of rolling-element complement mass is 67 g, or 0.15 g per mm² of the 32×13.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm pin bore this is one of the smallest HR1 executions — chosen where a 32 mm envelope must carry line-contact loads that no miniature ball bearing could take C 7.5 kN and C0 8.3 kN cover the supported-track bending case; the contact seals set the limiting speed at 4,700 r/min NA22 is the sealed yoke-type track roller with inner ring: 2RSR contact seals on both sides and a 12 mm bore for an ordinary mounting pin 2RSR means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 4,700 r/min. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 32 mm track diameter and 7.5 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 12 mm seat, and in packaging machine timing mechanisms the 67 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 13.8 mm width and the published 8.3 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 32 mm outer ring does. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 32 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NA2201-2RSR?", "a": "The NA2201-2RSR is a NA22 sealed yoke-type track roller with inner ring with 32 mm outside diameter, 12 mm bore and 13.8 mm width, envelope 12×32×13.8 mm. Mass is 67 g." }, { "q": "What does the NA2201-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2201-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×13.8 mm and the catalogue ratings are C 7.5 kN, C0 8.3 kN, Cur 1.29 kN." }, { "q": "What is the load capacity of the NA2201-2RSR?", "a": "The basic dynamic load rating C is 7.5 kN and the basic static load rating C0 is 8.3 kN; the fatigue load limit Cur is 1.29 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2201-2RSR?", "a": "HR1 lists a limiting speed of 4,700 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2201-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The inner ring lets the 12 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2201", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2201-2RSR", "NA2201-2RSR" ], "locale_variants": {} }, { "sku": "NA2202-2RSR", "brand": "FAG", "manufacturer_designation": "NA2202-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 13.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.6, "static_load_kN": 9.9, "fatigue_load_limit_kN": 1.39, "limiting_speed_rpm": 3400, "max_rpm": 3400, "weight_g": 75, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×13.8 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 13.8 mm width sets the contact width on the mating track the catalogue lists C 7.6 kN and C0 9.9 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.77 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.39 kN at 15 mm bore, equivalent to 0.51 kN of dynamic rating per millimetre — the limiting speed is 3,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 13.8 mm contact width the dynamic rating works out to 0.55 kN per millimetre of rolling-element complement mass is 75 g, or 0.16 g per mm² of the 35×13.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 15 mm pin bore this size balances the 35 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Reading NA22..2RSR: sealed flangeless yoke roller with inner ring; the 13.8 mm-wide unit needs lateral location from the adjacent structure The inner ring means no hard journal is required — machine the pin to normal tolerance, fit the sealed roller, and forget relubrication for the design life The sealed 2RSR execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 35 mm track diameter and 7.6 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 15 mm seat, and in packaging machine timing mechanisms the 75 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 13.8 mm width and the published 9.9 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NA2202-2RSR?", "a": "The NA2202-2RSR is a NA22 sealed yoke-type track roller with inner ring with 35 mm outside diameter, 15 mm bore and 13.8 mm width, envelope 15×35×13.8 mm. Mass is 75 g." }, { "q": "What does the NA2202-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2202-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×35×13.8 mm and the catalogue ratings are C 7.6 kN, C0 9.9 kN, Cur 1.39 kN." }, { "q": "What is the load capacity of the NA2202-2RSR?", "a": "The basic dynamic load rating C is 7.6 kN and the basic static load rating C0 is 9.9 kN; the fatigue load limit Cur is 1.39 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2202-2RSR?", "a": "HR1 lists a limiting speed of 3,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2202-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2202", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2202-2RSR", "NA2202-2RSR" ], "locale_variants": {} }, { "sku": "NA2203-2RSR", "brand": "FAG", "manufacturer_designation": "NA2203-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 15.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.9, "static_load_kN": 14.2, "fatigue_load_limit_kN": 1.87, "limiting_speed_rpm": 3000, "max_rpm": 3000, "weight_g": 112, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×15.8 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 15.8 mm width sets the contact width on the mating track the catalogue lists C 9.9 kN and C0 14.2 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.70 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.87 kN at 17 mm bore, equivalent to 0.58 kN of dynamic rating per millimetre — the limiting speed is 3,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 15.8 mm contact width the dynamic rating works out to 0.63 kN per millimetre of rolling-element complement mass is 112 g, or 0.18 g per mm² of the 40×15.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 17 mm pin bore the 15.8 mm width and 9.9 kN C rating suit high-cycle industrial machinery rather than instrument duty Typical positions are conveyor diverts, packaging cams and textile machines where 112 g maintenance-free rollers replace plain-bushed followers The 2RSR suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 40 mm outer ring. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 40 mm track diameter and 9.9 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 17 mm seat, and in packaging machine timing mechanisms the 112 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 15.8 mm width and the published 14.2 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 40 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NA2203-2RSR?", "a": "The NA2203-2RSR is a NA22 sealed yoke-type track roller with inner ring with 40 mm outside diameter, 17 mm bore and 15.8 mm width, envelope 17×40×15.8 mm. Mass is 112 g." }, { "q": "What does the NA2203-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2203-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×40×15.8 mm and the catalogue ratings are C 9.9 kN, C0 14.2 kN, Cur 1.87 kN." }, { "q": "What is the load capacity of the NA2203-2RSR?", "a": "The basic dynamic load rating C is 9.9 kN and the basic static load rating C0 is 14.2 kN; the fatigue load limit Cur is 1.87 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2203-2RSR?", "a": "HR1 lists a limiting speed of 3,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2203-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2203", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2203-2RSR", "NA2203-2RSR" ], "locale_variants": {} }, { "sku": "NA2204-2RSR", "brand": "FAG", "manufacturer_designation": "NA2204-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 17.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14, "static_load_kN": 19.3, "fatigue_load_limit_kN": 2.7, "limiting_speed_rpm": 2300, "max_rpm": 2300, "weight_g": 177, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×17.8 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 17.8 mm width sets the contact width on the mating track the catalogue lists C 14 kN and C0 19.3 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.7 kN at 20 mm bore, equivalent to 0.70 kN of dynamic rating per millimetre — the limiting speed is 2,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 17.8 mm contact width the dynamic rating works out to 0.79 kN per millimetre of rolling-element complement mass is 177 g, or 0.21 g per mm² of the 47×17.8 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty C 14 kN and C0 19.3 kN cover the supported-track bending case; the contact seals set the limiting speed at 2,300 r/min The thick-walled 47 mm outer ring with crowned profile runs on flat or slightly imperfect tracks, greased for life behind the two side seals Reading the suffix: 2RSR is the FAG/INA code for rubbing lip seals at both faces, making the 20 mm-bore unit greased for life. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 47 mm track diameter and 14 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 20 mm seat, and in packaging machine timing mechanisms the 177 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 17.8 mm width and the published 19.3 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 47 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NA2204-2RSR?", "a": "The NA2204-2RSR is a NA22 sealed yoke-type track roller with inner ring with 47 mm outside diameter, 20 mm bore and 17.8 mm width, envelope 20×47×17.8 mm. Mass is 177 g." }, { "q": "What does the NA2204-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2204-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×17.8 mm and the catalogue ratings are C 14 kN, C0 19.3 kN, Cur 2.7 kN." }, { "q": "What is the load capacity of the NA2204-2RSR?", "a": "The basic dynamic load rating C is 14 kN and the basic static load rating C0 is 19.3 kN; the fatigue load limit Cur is 2.7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2204-2RSR?", "a": "HR1 lists a limiting speed of 2,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2204-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2204", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2204-2RSR", "NA2204-2RSR" ], "locale_variants": {} }, { "sku": "NA2205-2RSR", "brand": "FAG", "manufacturer_designation": "NA2205-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 17.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 14.4, "static_load_kN": 21.1, "fatigue_load_limit_kN": 2.95, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 209, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×17.8 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 17.8 mm width sets the contact width on the mating track the catalogue lists C 14.4 kN and C0 21.1 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.95 kN at 25 mm bore, equivalent to 0.58 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 17.8 mm contact width the dynamic rating works out to 0.81 kN per millimetre of rolling-element complement mass is 209 g, or 0.23 g per mm² of the 52×17.8 mm track envelope — inertia that the drive must accelerate on every index of the cam at 25 mm pin bore this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range C 14.4 kN and C0 21.1 kN cover the supported-track bending case; the contact seals set the limiting speed at 1,800 r/min Seal drag is part of the torque budget at small sizes, and running above the limiting speed overheats the lips and destroys the grease fill rather than merely shortening life With 2RSR seals the 209 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 52 mm track diameter and 14.4 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 25 mm seat, and in packaging machine timing mechanisms the 209 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 17.8 mm width and the published 21.1 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the NA2205-2RSR?", "a": "The NA2205-2RSR is a NA22 sealed yoke-type track roller with inner ring with 52 mm outside diameter, 25 mm bore and 17.8 mm width, envelope 25×52×17.8 mm. Mass is 209 g." }, { "q": "What does the NA2205-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2205-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×17.8 mm and the catalogue ratings are C 14.4 kN, C0 21.1 kN, Cur 2.95 kN." }, { "q": "What is the load capacity of the NA2205-2RSR?", "a": "The basic dynamic load rating C is 14.4 kN and the basic static load rating C0 is 21.1 kN; the fatigue load limit Cur is 2.95 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2205-2RSR?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2205-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2205", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2205-2RSR", "NA2205-2RSR" ], "locale_variants": {} }, { "sku": "NA2206-2RSR", "brand": "FAG", "manufacturer_designation": "NA2206-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 19.8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 17, "static_load_kN": 26.5, "fatigue_load_limit_kN": 3.6, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 324, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×19.8 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 19.8 mm width sets the contact width on the mating track the catalogue lists C 17 kN and C0 26.5 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.64 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.6 kN at 30 mm bore, equivalent to 0.57 kN of dynamic rating per millimetre — the limiting speed is 1,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 19.8 mm contact width the dynamic rating works out to 0.86 kN per millimetre of rolling-element complement mass is 324 g, or 0.26 g per mm² of the 62×19.8 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 30 mm pin bore the 19.8 mm width and 17 kN C rating suit high-cycle industrial machinery rather than instrument duty C 17 kN and C0 26.5 kN cover the supported-track bending case; the contact seals set the limiting speed at 1,400 r/min The inner ring means no hard journal is required — machine the pin to normal tolerance, fit the sealed roller, and forget relubrication for the design life 2RSR means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 1,400 r/min. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 62 mm track diameter and 17 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 30 mm seat, and in packaging machine timing mechanisms the 324 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 19.8 mm width and the published 26.5 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NA2206-2RSR?", "a": "The NA2206-2RSR is a NA22 sealed yoke-type track roller with inner ring with 62 mm outside diameter, 30 mm bore and 19.8 mm width, envelope 30×62×19.8 mm. Mass is 324 g." }, { "q": "What does the NA2206-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2206-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×62×19.8 mm and the catalogue ratings are C 17 kN, C0 26.5 kN, Cur 3.6 kN." }, { "q": "What is the load capacity of the NA2206-2RSR?", "a": "The basic dynamic load rating C is 17 kN and the basic static load rating C0 is 26.5 kN; the fatigue load limit Cur is 3.6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2206-2RSR?", "a": "HR1 lists a limiting speed of 1,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2206-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2206", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2206-2RSR", "NA2206-2RSR" ], "locale_variants": {} }, { "sku": "NA2207-2RSR", "brand": "FAG", "manufacturer_designation": "NA2207-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 35, "D_mm": 72, "B_mm": 22.7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 21.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 5.3, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 505, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×72×22.7 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 22.7 mm width sets the contact width on the mating track the catalogue lists C 21.5 kN and C0 36.5 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.3 kN at 35 mm bore, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 22.7 mm contact width the dynamic rating works out to 0.95 kN per millimetre of rolling-element complement mass is 505 g, or 0.31 g per mm² of the 72×22.7 mm track envelope — inertia that the drive must accelerate on every index of the cam the 35 mm pin bore places this bearing in the medium band, where the 72 mm envelope already carries ratings in the tens of kilonewtons Reading NA22..2RSR: sealed flangeless yoke roller with inner ring; the 22.7 mm-wide unit needs lateral location from the adjacent structure The thick-walled 72 mm outer ring with crowned profile runs on flat or slightly imperfect tracks, greased for life behind the two side seals The sealed 2RSR execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 72 mm track diameter and 21.5 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 35 mm seat, and in packaging machine timing mechanisms the 505 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 22.7 mm width and the published 36.5 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 72 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NA2207-2RSR?", "a": "The NA2207-2RSR is a NA22 sealed yoke-type track roller with inner ring with 72 mm outside diameter, 35 mm bore and 22.7 mm width, envelope 35×72×22.7 mm. Mass is 505 g." }, { "q": "What does the NA2207-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2207-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 35×72×22.7 mm and the catalogue ratings are C 21.5 kN, C0 36.5 kN, Cur 5.3 kN." }, { "q": "What is the load capacity of the NA2207-2RSR?", "a": "The basic dynamic load rating C is 21.5 kN and the basic static load rating C0 is 36.5 kN; the fatigue load limit Cur is 5.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2207-2RSR?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2207-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2207", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2207-2RSR", "NA2207-2RSR" ], "locale_variants": {} }, { "sku": "NA2208-2RSR", "brand": "FAG", "manufacturer_designation": "NA2208-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 40, "D_mm": 80, "B_mm": 22.7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 41.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 628, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×80×22.7 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 22.7 mm width sets the contact width on the mating track the catalogue lists C 26 kN and C0 41.5 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.63 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.4 kN at 40 mm bore, equivalent to 0.65 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 22.7 mm contact width the dynamic rating works out to 1.15 kN per millimetre of rolling-element complement mass is 628 g, or 0.35 g per mm² of the 80×22.7 mm track envelope — inertia that the drive must accelerate on every index of the cam at 40 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22.7 mm width as a standard mounting space The inner ring means no hard journal is required — machine the pin to normal tolerance, fit the sealed roller, and forget relubrication for the design life The thick-walled 80 mm outer ring with crowned profile runs on flat or slightly imperfect tracks, greased for life behind the two side seals The 2RSR suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 80 mm outer ring. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 80 mm track diameter and 26 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 40 mm seat, and in packaging machine timing mechanisms the 628 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 22.7 mm width and the published 41.5 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 80 mm outer ring does. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 80 mm outer ring does.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NA2208-2RSR?", "a": "The NA2208-2RSR is a NA22 sealed yoke-type track roller with inner ring with 80 mm outside diameter, 40 mm bore and 22.7 mm width, envelope 40×80×22.7 mm. Mass is 628 g." }, { "q": "What does the NA2208-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2208-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 40×80×22.7 mm and the catalogue ratings are C 26 kN, C0 41.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NA2208-2RSR?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 5.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2208-2RSR?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2208-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2208", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2208-2RSR", "NA2208-2RSR" ], "locale_variants": {} }, { "sku": "NA2210-2RSR", "brand": "FAG", "manufacturer_designation": "NA2210-2RSR", "series": "na22-series", "type": "support_roller", "d_mm": 50, "D_mm": 90, "B_mm": 22.7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 44, "fatigue_load_limit_kN": 5.7, "limiting_speed_rpm": 650, "max_rpm": 650, "weight_g": 690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×90×22.7 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 22.7 mm width sets the contact width on the mating track the catalogue lists C 26 kN and C0 44 kN for the NA22 sealed yoke-type track roller with inner ring; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.7 kN at 50 mm bore, equivalent to 0.52 kN of dynamic rating per millimetre — the limiting speed is 650 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 22.7 mm contact width the dynamic rating works out to 1.15 kN per millimetre of rolling-element complement mass is 690 g, or 0.34 g per mm² of the 90×22.7 mm track envelope — inertia that the drive must accelerate on every index of the cam at 50 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 22.7 mm width as a standard mounting space The inner ring means no hard journal is required — machine the pin to normal tolerance, fit the sealed roller, and forget relubrication for the design life Seal drag is part of the torque budget at small sizes, and running above the limiting speed overheats the lips and destroys the grease fill rather than merely shortening life With 2RSR seals the 690 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 90 mm track diameter and 26 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 50 mm seat, and in cam drives and indexing tables the 690 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 22.7 mm width and the published 44 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NA2210-2RSR?", "a": "The NA2210-2RSR is a NA22 sealed yoke-type track roller with inner ring with 90 mm outside diameter, 50 mm bore and 22.7 mm width, envelope 50×90×22.7 mm. Mass is 690 g." }, { "q": "What does the NA2210-2RSR designation mean in the FAG/INA HR1 catalogue?", "a": "NA2210-2RSR identifies this NA22 sealed yoke-type track roller with inner ring in the Schaeffler HR1 rolling bearings catalogue. The envelope is 50×90×22.7 mm and the catalogue ratings are C 26 kN, C0 44 kN, Cur 5.7 kN." }, { "q": "What is the load capacity of the NA2210-2RSR?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 44 kN; the fatigue load limit Cur is 5.7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NA2210-2RSR?", "a": "HR1 lists a limiting speed of 650 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NA2210-2RSR?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NA2210", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1449", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NA2210-2RSR", "NA2210-2RSR" ], "locale_variants": {} }, { "sku": "NATR5", "brand": "FAG", "manufacturer_designation": "NATR5", "series": "natr-series", "type": "support_roller", "d_mm": 5, "D_mm": 16, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.15, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 14, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×16×12 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 5 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 3.15 kN and C0 3.4 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.93 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.46 kN at 5 mm bore, equivalent to 0.63 kN of dynamic rating per millimetre — the limiting speed is 14,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 5 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.26 kN per millimetre of rolling-element complement mass is 14 g, or 0.07 g per mm² of the 16×12 mm track envelope — inertia that the drive must accelerate on every index of the cam the 5 mm pin bore sits in the miniature band; at 12 mm wide the NATR5 is built into compact cam drives, indexing pawls and light linkages Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the open execution is relubricated through the inner ring or pin The cage keeps the NATV at the higher limiting speed of 14,000 r/min for a track roller, with C 3.15 kN and C0 3.4 kN Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 16 mm track diameter and 3.15 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 5 mm seat, and in cam drives and indexing tables the 14 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 12 mm width and the published 3.4 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NATR5?", "a": "The NATR5 is a NATR yoke-type track roller with cage and axial guidance with 16 mm outside diameter, 5 mm bore and 12 mm width, envelope 5×16×12 mm. Mass is 14 g." }, { "q": "What does the NATR5 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR5 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 5×16×12 mm and the catalogue ratings are C 3.15 kN, C0 3.4 kN, Cur 0.46 kN." }, { "q": "What is the load capacity of the NATR5?", "a": "The basic dynamic load rating C is 3.15 kN and the basic static load rating C0 is 3.4 kN; the fatigue load limit Cur is 0.46 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR5?", "a": "HR1 lists a limiting speed of 14,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR5?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 16 mm outer surface tolerates only small angular error. The inner ring lets the 5 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR5-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR5", "NATR5" ], "locale_variants": {} }, { "sku": "NATR5-PP", "brand": "FAG", "manufacturer_designation": "NATR5-PP", "series": "natr-series", "type": "support_roller", "d_mm": 5, "D_mm": 16, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.15, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 14, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×16×12 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 5 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 3.15 kN and C0 3.4 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.93 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.46 kN at 5 mm bore, equivalent to 0.63 kN of dynamic rating per millimetre — the limiting speed is 14,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 5 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.26 kN per millimetre of rolling-element complement mass is 14 g, or 0.07 g per mm² of the 16×12 mm track envelope — inertia that the drive must accelerate on every index of the cam 5 mm pin bore and only 14 g: the smallest sizes demand accurate shaft geometry, because the 5.5 mm section leaves no tolerance for a soft or tapered seat At 5 mm bore and 14 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Reading -PP: rubbing seals at each face of the 16 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 16 mm track diameter and 3.15 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 5 mm seat, and in glass and ceramic line conveyors the 14 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 12 mm width and the published 3.4 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 16 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATR5-PP?", "a": "The NATR5-PP is a NATR yoke-type track roller with cage and axial guidance with 16 mm outside diameter, 5 mm bore and 12 mm width, envelope 5×16×12 mm. Mass is 14 g." }, { "q": "What does the NATR5-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR5-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 5×16×12 mm and the catalogue ratings are C 3.15 kN, C0 3.4 kN, Cur 0.46 kN." }, { "q": "What is the load capacity of the NATR5-PP?", "a": "The basic dynamic load rating C is 3.15 kN and the basic static load rating C0 is 3.4 kN; the fatigue load limit Cur is 0.46 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR5-PP?", "a": "HR1 lists a limiting speed of 14,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR5-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 16 mm outer surface tolerates only small angular error. The inner ring lets the 5 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR5", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR5-PP", "NATR5-PP" ], "locale_variants": {} }, { "sku": "NATV5", "brand": "FAG", "manufacturer_designation": "NATV5", "series": "natv-series", "type": "support_roller", "d_mm": 5, "D_mm": 16, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4.9, "static_load_kN": 6.7, "fatigue_load_limit_kN": 0.97, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 15, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×16×12 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 5 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 4.9 kN and C0 6.7 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.97 kN at 5 mm bore, equivalent to 0.98 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 5 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.41 kN per millimetre of rolling-element complement mass is 15 g, or 0.08 g per mm² of the 16×12 mm track envelope — inertia that the drive must accelerate on every index of the cam the 5 mm pin bore sits in the miniature band; at 12 mm wide the NATV5 is built into compact cam drives, indexing pawls and light linkages At 5 mm bore and 15 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 12 mm width covers most standard cam geometries Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 16 mm track diameter and 4.9 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 5 mm seat, and in linear rail and profile track guidance the 15 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 12 mm width and the published 6.7 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 16 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATV5?", "a": "The NATV5 is a NATV full-complement yoke-type track roller with axial guidance with 16 mm outside diameter, 5 mm bore and 12 mm width, envelope 5×16×12 mm. Mass is 15 g." }, { "q": "What does the NATV5 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV5 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 5×16×12 mm and the catalogue ratings are C 4.9 kN, C0 6.7 kN, Cur 0.97 kN." }, { "q": "What is the load capacity of the NATV5?", "a": "The basic dynamic load rating C is 4.9 kN and the basic static load rating C0 is 6.7 kN; the fatigue load limit Cur is 0.97 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV5?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV5?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 16 mm outer surface tolerates only small angular error. The inner ring lets the 5 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV5-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV5", "NATV5" ], "locale_variants": {} }, { "sku": "NATV5-PP", "brand": "FAG", "manufacturer_designation": "NATV5-PP", "series": "natv-series", "type": "support_roller", "d_mm": 5, "D_mm": 16, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4.9, "static_load_kN": 6.7, "fatigue_load_limit_kN": 0.97, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 15, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 5×16×12 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 5 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 4.9 kN and C0 6.7 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.97 kN at 5 mm bore, equivalent to 0.98 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 5 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.41 kN per millimetre of rolling-element complement mass is 15 g, or 0.08 g per mm² of the 16×12 mm track envelope — inertia that the drive must accelerate on every index of the cam 5 mm pin bore and only 15 g: the smallest sizes demand accurate shaft geometry, because the 5.5 mm section leaves no tolerance for a soft or tapered seat NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 16 mm envelope for maximum C0 6.7 kN, guided axially by the outer-ring ribs The crowned outside surface of the 16 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 12 mm width. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 16 mm track diameter and 4.9 kN dynamic rating match the duty. In robotic arm linear axes the unit fits a compact 5 mm seat, and in agricultural and textile cam followers the 15 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 12 mm width and the published 6.7 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 16 mm outer ring does. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 16 mm outer ring does.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NATV5-PP?", "a": "The NATV5-PP is a NATV full-complement yoke-type track roller with axial guidance with 16 mm outside diameter, 5 mm bore and 12 mm width, envelope 5×16×12 mm. Mass is 15 g." }, { "q": "What does the NATV5-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV5-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 5×16×12 mm and the catalogue ratings are C 4.9 kN, C0 6.7 kN, Cur 0.97 kN." }, { "q": "What is the load capacity of the NATV5-PP?", "a": "The basic dynamic load rating C is 4.9 kN and the basic static load rating C0 is 6.7 kN; the fatigue load limit Cur is 0.97 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV5-PP?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV5-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 16 mm outer surface tolerates only small angular error. The inner ring lets the 5 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV5", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV5-PP", "NATV5-PP" ], "locale_variants": {} }, { "sku": "NATR6", "brand": "FAG", "manufacturer_designation": "NATR6", "series": "natr-series", "type": "support_roller", "d_mm": 6, "D_mm": 19, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.5, "static_load_kN": 4.05, "fatigue_load_limit_kN": 0.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×19×12 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 3.5 kN and C0 4.05 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.86 reflects a rolling-element pack sized for heavy static track loading, and the 6.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.55 kN at 6 mm bore, equivalent to 0.58 kN of dynamic rating per millimetre — the limiting speed is 11,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.29 kN per millimetre of rolling-element complement mass is 20 g, or 0.09 g per mm² of the 19×12 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm pin bore and only 20 g: the smallest sizes demand accurate shaft geometry, because the 6.5 mm section leaves no tolerance for a soft or tapered seat At 6 mm bore and 20 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load NATR is the caged yoke-type track roller: a needle roller and cage assembly runs inside the rib-guided thick-walled outer ring on the 6 mm inner-ring bore Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 19 mm track diameter and 3.5 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 6 mm seat, and in printing press sheet-transfer grippers the 20 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 12 mm width and the published 4.05 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATR6?", "a": "The NATR6 is a NATR yoke-type track roller with cage and axial guidance with 19 mm outside diameter, 6 mm bore and 12 mm width, envelope 6×19×12 mm. Mass is 20 g." }, { "q": "What does the NATR6 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR6 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×19×12 mm and the catalogue ratings are C 3.5 kN, C0 4.05 kN, Cur 0.55 kN." }, { "q": "What is the load capacity of the NATR6?", "a": "The basic dynamic load rating C is 3.5 kN and the basic static load rating C0 is 4.05 kN; the fatigue load limit Cur is 0.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR6?", "a": "HR1 lists a limiting speed of 11,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR6?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The inner ring lets the 6 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR6-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR6", "NATR6" ], "locale_variants": {} }, { "sku": "NATR6-PP", "brand": "FAG", "manufacturer_designation": "NATR6-PP", "series": "natr-series", "type": "support_roller", "d_mm": 6, "D_mm": 19, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.5, "static_load_kN": 4.05, "fatigue_load_limit_kN": 0.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 19, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×19×12 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 3.5 kN and C0 4.05 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.86 reflects a rolling-element pack sized for heavy static track loading, and the 6.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.55 kN at 6 mm bore, equivalent to 0.58 kN of dynamic rating per millimetre — the limiting speed is 11,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.29 kN per millimetre of rolling-element complement mass is 19 g, or 0.08 g per mm² of the 19×12 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm pin bore and only 19 g: the smallest sizes demand accurate shaft geometry, because the 6.5 mm section leaves no tolerance for a soft or tapered seat The cage keeps the NATV at the higher limiting speed of 11,000 r/min for a track roller, with C 3.5 kN and C0 4.05 kN Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the PP suffix adds lip seals on both sides and a life-long grease fill Reading -PP: rubbing seals at each face of the 19 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 19 mm track diameter and 3.5 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 6 mm seat, and in conveyor transfer and diverting stations the 19 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 12 mm width and the published 4.05 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NATR6-PP?", "a": "The NATR6-PP is a NATR yoke-type track roller with cage and axial guidance with 19 mm outside diameter, 6 mm bore and 12 mm width, envelope 6×19×12 mm. Mass is 19 g." }, { "q": "What does the NATR6-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR6-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×19×12 mm and the catalogue ratings are C 3.5 kN, C0 4.05 kN, Cur 0.55 kN." }, { "q": "What is the load capacity of the NATR6-PP?", "a": "The basic dynamic load rating C is 3.5 kN and the basic static load rating C0 is 4.05 kN; the fatigue load limit Cur is 0.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR6-PP?", "a": "HR1 lists a limiting speed of 11,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR6-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The inner ring lets the 6 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR6", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR6-PP", "NATR6-PP" ], "locale_variants": {} }, { "sku": "NATV6", "brand": "FAG", "manufacturer_designation": "NATV6", "series": "natv-series", "type": "support_roller", "d_mm": 6, "D_mm": 19, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5.4, "static_load_kN": 8.1, "fatigue_load_limit_kN": 1.19, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 21, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×19×12 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 5.4 kN and C0 8.1 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 6.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.19 kN at 6 mm bore, equivalent to 0.90 kN of dynamic rating per millimetre — the limiting speed is 3,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.45 kN per millimetre of rolling-element complement mass is 21 g, or 0.09 g per mm² of the 19×12 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm pin bore and only 21 g: the smallest sizes demand accurate shaft geometry, because the 6.5 mm section leaves no tolerance for a soft or tapered seat NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 19 mm envelope for maximum C0 8.1 kN, guided axially by the outer-ring ribs The cageless rollers can brinell on very short oscillating strokes — the motion must rotate the full pack, not just rock it Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 19 mm track diameter and 5.4 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 6 mm seat, and in automatic assembly machine carriages the 21 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 12 mm width and the published 8.1 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the NATV6?", "a": "The NATV6 is a NATV full-complement yoke-type track roller with axial guidance with 19 mm outside diameter, 6 mm bore and 12 mm width, envelope 6×19×12 mm. Mass is 21 g." }, { "q": "What does the NATV6 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV6 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×19×12 mm and the catalogue ratings are C 5.4 kN, C0 8.1 kN, Cur 1.19 kN." }, { "q": "What is the load capacity of the NATV6?", "a": "The basic dynamic load rating C is 5.4 kN and the basic static load rating C0 is 8.1 kN; the fatigue load limit Cur is 1.19 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV6?", "a": "HR1 lists a limiting speed of 3,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV6?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The inner ring lets the 6 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV6-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV6", "NATV6" ], "locale_variants": {} }, { "sku": "NATV6-PP", "brand": "FAG", "manufacturer_designation": "NATV6-PP", "series": "natv-series", "type": "support_roller", "d_mm": 6, "D_mm": 19, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5.4, "static_load_kN": 8.1, "fatigue_load_limit_kN": 1.19, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 21, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 6×19×12 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm bore — and the 12 mm width sets the contact width on the mating track the catalogue lists C 5.4 kN and C0 8.1 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 6.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.19 kN at 6 mm bore, equivalent to 0.90 kN of dynamic rating per millimetre — the limiting speed is 3,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm bore takes the mounting pin or shaft; across the 12 mm contact width the dynamic rating works out to 0.45 kN per millimetre of rolling-element complement mass is 21 g, or 0.09 g per mm² of the 19×12 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm pin bore and only 21 g: the smallest sizes demand accurate shaft geometry, because the 6.5 mm section leaves no tolerance for a soft or tapered seat Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the PP suffix adds lip seals on both sides and a life-long grease fill The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 12 mm width covers most standard cam geometries -PP protection suits cams and rails that are washed down or run in dust; exceeding the 3,100 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 19 mm track diameter and 5.4 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 6 mm seat, and in printing press sheet-transfer grippers the 21 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 12 mm width and the published 8.1 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 19 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATV6-PP?", "a": "The NATV6-PP is a NATV full-complement yoke-type track roller with axial guidance with 19 mm outside diameter, 6 mm bore and 12 mm width, envelope 6×19×12 mm. Mass is 21 g." }, { "q": "What does the NATV6-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV6-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×19×12 mm and the catalogue ratings are C 5.4 kN, C0 8.1 kN, Cur 1.19 kN." }, { "q": "What is the load capacity of the NATV6-PP?", "a": "The basic dynamic load rating C is 5.4 kN and the basic static load rating C0 is 8.1 kN; the fatigue load limit Cur is 1.19 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV6-PP?", "a": "HR1 lists a limiting speed of 3,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV6-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 19 mm outer surface tolerates only small angular error. The inner ring lets the 6 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV6", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV6-PP", "NATV6-PP" ], "locale_variants": {} }, { "sku": "NATR8", "brand": "FAG", "manufacturer_designation": "NATR8", "series": "natr-series", "type": "support_roller", "d_mm": 8, "D_mm": 24, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.5, "static_load_kN": 6.7, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 41, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×24×15 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 5.5 kN and C0 6.7 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.82 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.94 kN at 8 mm bore, equivalent to 0.69 kN of dynamic rating per millimetre — the limiting speed is 7,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.37 kN per millimetre of rolling-element complement mass is 41 g, or 0.11 g per mm² of the 24×15 mm track envelope — inertia that the drive must accelerate on every index of the cam the 8 mm pin bore sits in the miniature band; at 15 mm wide the NATR8 is built into compact cam drives, indexing pawls and light linkages At 8 mm bore and 41 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load The cage can be damaged by heavy shock loads even though the rollers would survive — size to C, not just envelope Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 24 mm track diameter and 5.5 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 8 mm seat, and in linear rail and profile track guidance the 41 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 15 mm width and the published 6.7 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NATR8?", "a": "The NATR8 is a NATR yoke-type track roller with cage and axial guidance with 24 mm outside diameter, 8 mm bore and 15 mm width, envelope 8×24×15 mm. Mass is 41 g." }, { "q": "What does the NATR8 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR8 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×24×15 mm and the catalogue ratings are C 5.5 kN, C0 6.7 kN, Cur 0.94 kN." }, { "q": "What is the load capacity of the NATR8?", "a": "The basic dynamic load rating C is 5.5 kN and the basic static load rating C0 is 6.7 kN; the fatigue load limit Cur is 0.94 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR8?", "a": "HR1 lists a limiting speed of 7,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR8?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The inner ring lets the 8 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR8-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR8", "NATR8" ], "locale_variants": {} }, { "sku": "NATR8-PP", "brand": "FAG", "manufacturer_designation": "NATR8-PP", "series": "natr-series", "type": "support_roller", "d_mm": 8, "D_mm": 24, "B_mm": 15, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.5, "static_load_kN": 6.7, "fatigue_load_limit_kN": 0.94, "limiting_speed_rpm": 7500, "max_rpm": 7500, "weight_g": 38, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×24×15 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 5.5 kN and C0 6.7 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.82 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.94 kN at 8 mm bore, equivalent to 0.69 kN of dynamic rating per millimetre — the limiting speed is 7,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.37 kN per millimetre of rolling-element complement mass is 38 g, or 0.11 g per mm² of the 24×15 mm track envelope — inertia that the drive must accelerate on every index of the cam the 8 mm pin bore sits in the miniature band; at 15 mm wide the NATR8-PP is built into compact cam drives, indexing pawls and light linkages Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the PP suffix adds lip seals on both sides and a life-long grease fill The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 15 mm width covers most standard cam geometries The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 7,500 r/min limiting speed. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 24 mm track diameter and 5.5 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 8 mm seat, and in printing press sheet-transfer grippers the 38 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 15 mm width and the published 6.7 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 24 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATR8-PP?", "a": "The NATR8-PP is a NATR yoke-type track roller with cage and axial guidance with 24 mm outside diameter, 8 mm bore and 15 mm width, envelope 8×24×15 mm. Mass is 38 g." }, { "q": "What does the NATR8-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR8-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×24×15 mm and the catalogue ratings are C 5.5 kN, C0 6.7 kN, Cur 0.94 kN." }, { "q": "What is the load capacity of the NATR8-PP?", "a": "The basic dynamic load rating C is 5.5 kN and the basic static load rating C0 is 6.7 kN; the fatigue load limit Cur is 0.94 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR8-PP?", "a": "HR1 lists a limiting speed of 7,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR8-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The inner ring lets the 8 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR8", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR8-PP", "NATR8-PP" ], "locale_variants": {} }, { "sku": "NATV8", "brand": "FAG", "manufacturer_designation": "NATV8", "series": "natv-series", "type": "support_roller", "d_mm": 8, "D_mm": 24, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 7.8, "static_load_kN": 11.7, "fatigue_load_limit_kN": 1.62, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 42, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×24×15 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 7.8 kN and C0 11.7 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.62 kN at 8 mm bore, equivalent to 0.97 kN of dynamic rating per millimetre — the limiting speed is 2,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.52 kN per millimetre of rolling-element complement mass is 42 g, or 0.12 g per mm² of the 24×15 mm track envelope — inertia that the drive must accelerate on every index of the cam the 8 mm pin bore sits in the miniature band; at 15 mm wide the NATV8 is built into compact cam drives, indexing pawls and light linkages The cageless rollers can brinell on very short oscillating strokes — the motion must rotate the full pack, not just rock it The crowned outside surface of the 24 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 24 mm track diameter and 7.8 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 8 mm seat, and in conveyor transfer and diverting stations the 42 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 15 mm width and the published 11.7 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NATV8?", "a": "The NATV8 is a NATV full-complement yoke-type track roller with axial guidance with 24 mm outside diameter, 8 mm bore and 15 mm width, envelope 8×24×15 mm. Mass is 42 g." }, { "q": "What does the NATV8 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV8 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×24×15 mm and the catalogue ratings are C 7.8 kN, C0 11.7 kN, Cur 1.62 kN." }, { "q": "What is the load capacity of the NATV8?", "a": "The basic dynamic load rating C is 7.8 kN and the basic static load rating C0 is 11.7 kN; the fatigue load limit Cur is 1.62 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV8?", "a": "HR1 lists a limiting speed of 2,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV8?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The inner ring lets the 8 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV8-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV8", "NATV8" ], "locale_variants": {} }, { "sku": "NATV8-PP", "brand": "FAG", "manufacturer_designation": "NATV8-PP", "series": "natv-series", "type": "support_roller", "d_mm": 8, "D_mm": 24, "B_mm": 15, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 7.8, "static_load_kN": 11.7, "fatigue_load_limit_kN": 1.62, "limiting_speed_rpm": 2500, "max_rpm": 2500, "weight_g": 41, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 8×24×15 mm: the 24 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 7.8 kN and C0 11.7 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.62 kN at 8 mm bore, equivalent to 0.97 kN of dynamic rating per millimetre — the limiting speed is 2,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.52 kN per millimetre of rolling-element complement mass is 41 g, or 0.11 g per mm² of the 24×15 mm track envelope — inertia that the drive must accelerate on every index of the cam 8 mm pin bore and only 41 g: the smallest sizes demand accurate shaft geometry, because the 8.0 mm section leaves no tolerance for a soft or tapered seat NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 24 mm envelope for maximum C0 11.7 kN, guided axially by the outer-ring ribs Without a cage the NATV trades speed for static capacity — the limiting speed is 2,500 r/min, with C 7.8 kN and C0 11.7 kN The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 2,500 r/min limiting speed. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 24 mm track diameter and 7.8 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 8 mm seat, and in conveyor transfer and diverting stations the 41 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 15 mm width and the published 11.7 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NATV8-PP?", "a": "The NATV8-PP is a NATV full-complement yoke-type track roller with axial guidance with 24 mm outside diameter, 8 mm bore and 15 mm width, envelope 8×24×15 mm. Mass is 41 g." }, { "q": "What does the NATV8-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV8-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×24×15 mm and the catalogue ratings are C 7.8 kN, C0 11.7 kN, Cur 1.62 kN." }, { "q": "What is the load capacity of the NATV8-PP?", "a": "The basic dynamic load rating C is 7.8 kN and the basic static load rating C0 is 11.7 kN; the fatigue load limit Cur is 1.62 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV8-PP?", "a": "HR1 lists a limiting speed of 2,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV8-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 24 mm outer surface tolerates only small angular error. The inner ring lets the 8 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV8", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV8-PP", "NATV8-PP" ], "locale_variants": {} }, { "sku": "NATR10", "brand": "FAG", "manufacturer_designation": "NATR10", "series": "natr-series", "type": "support_roller", "d_mm": 10, "D_mm": 30, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.8, "static_load_kN": 8.7, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 64, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×30×15 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 6.8 kN and C0 8.7 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.24 kN at 10 mm bore, equivalent to 0.68 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.45 kN per millimetre of rolling-element complement mass is 64 g, or 0.14 g per mm² of the 30×15 mm track envelope — inertia that the drive must accelerate on every index of the cam at 10 mm pin bore this is one of the smallest HR1 executions — chosen where a 30 mm envelope must carry line-contact loads that no miniature ball bearing could take At 10 mm bore and 64 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 30 mm track diameter and 6.8 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 10 mm seat, and in packaging machine timing mechanisms the 64 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 15 mm width and the published 8.7 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 30 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATR10?", "a": "The NATR10 is a NATR yoke-type track roller with cage and axial guidance with 30 mm outside diameter, 10 mm bore and 15 mm width, envelope 10×30×15 mm. Mass is 64 g." }, { "q": "What does the NATR10 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR10 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×30×15 mm and the catalogue ratings are C 6.8 kN, C0 8.7 kN, Cur 1.24 kN." }, { "q": "What is the load capacity of the NATR10?", "a": "The basic dynamic load rating C is 6.8 kN and the basic static load rating C0 is 8.7 kN; the fatigue load limit Cur is 1.24 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR10?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR10?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The inner ring lets the 10 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR10-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR10", "NATR10" ], "locale_variants": {} }, { "sku": "NATR10-PP", "brand": "FAG", "manufacturer_designation": "NATR10-PP", "series": "natr-series", "type": "support_roller", "d_mm": 10, "D_mm": 30, "B_mm": 15, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.8, "static_load_kN": 8.7, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 64, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×30×15 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 6.8 kN and C0 8.7 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.24 kN at 10 mm bore, equivalent to 0.68 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.45 kN per millimetre of rolling-element complement mass is 64 g, or 0.14 g per mm² of the 30×15 mm track envelope — inertia that the drive must accelerate on every index of the cam at 10 mm pin bore this is one of the smallest HR1 executions — chosen where a 30 mm envelope must carry line-contact loads that no miniature ball bearing could take At 10 mm bore and 64 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load NATR is the caged yoke-type track roller: a needle roller and cage assembly runs inside the rib-guided thick-walled outer ring on the 10 mm inner-ring bore -PP protection suits cams and rails that are washed down or run in dust; exceeding the 5,500 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 30 mm track diameter and 6.8 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 10 mm seat, and in cam drives and indexing tables the 64 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 15 mm width and the published 8.7 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATR10-PP?", "a": "The NATR10-PP is a NATR yoke-type track roller with cage and axial guidance with 30 mm outside diameter, 10 mm bore and 15 mm width, envelope 10×30×15 mm. Mass is 64 g." }, { "q": "What does the NATR10-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR10-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×30×15 mm and the catalogue ratings are C 6.8 kN, C0 8.7 kN, Cur 1.24 kN." }, { "q": "What is the load capacity of the NATR10-PP?", "a": "The basic dynamic load rating C is 6.8 kN and the basic static load rating C0 is 8.7 kN; the fatigue load limit Cur is 1.24 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR10-PP?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR10-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The inner ring lets the 10 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR10", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR10-PP", "NATR10-PP" ], "locale_variants": {} }, { "sku": "NATV10", "brand": "FAG", "manufacturer_designation": "NATV10", "series": "natv-series", "type": "support_roller", "d_mm": 10, "D_mm": 30, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 9.4, "static_load_kN": 15.1, "fatigue_load_limit_kN": 2.08, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 65, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×30×15 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 9.4 kN and C0 15.1 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.62 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.08 kN at 10 mm bore, equivalent to 0.94 kN of dynamic rating per millimetre — the limiting speed is 2,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.63 kN per millimetre of rolling-element complement mass is 65 g, or 0.14 g per mm² of the 30×15 mm track envelope — inertia that the drive must accelerate on every index of the cam 10 mm pin bore and only 65 g: the smallest sizes demand accurate shaft geometry, because the 10.0 mm section leaves no tolerance for a soft or tapered seat The cageless rollers can brinell on very short oscillating strokes — the motion must rotate the full pack, not just rock it The crowned outside surface of the 30 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 30 mm track diameter and 9.4 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 10 mm seat, and in automatic assembly machine carriages the 65 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 15 mm width and the published 15.1 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NATV10?", "a": "The NATV10 is a NATV full-complement yoke-type track roller with axial guidance with 30 mm outside diameter, 10 mm bore and 15 mm width, envelope 10×30×15 mm. Mass is 65 g." }, { "q": "What does the NATV10 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV10 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×30×15 mm and the catalogue ratings are C 9.4 kN, C0 15.1 kN, Cur 2.08 kN." }, { "q": "What is the load capacity of the NATV10?", "a": "The basic dynamic load rating C is 9.4 kN and the basic static load rating C0 is 15.1 kN; the fatigue load limit Cur is 2.08 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV10?", "a": "HR1 lists a limiting speed of 2,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV10?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The inner ring lets the 10 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV10-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV10", "NATV10" ], "locale_variants": {} }, { "sku": "NATV10-PP", "brand": "FAG", "manufacturer_designation": "NATV10-PP", "series": "natv-series", "type": "support_roller", "d_mm": 10, "D_mm": 30, "B_mm": 15, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 9.4, "static_load_kN": 15.1, "fatigue_load_limit_kN": 2.08, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 64, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 10×30×15 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 9.4 kN and C0 15.1 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.62 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.08 kN at 10 mm bore, equivalent to 0.94 kN of dynamic rating per millimetre — the limiting speed is 2,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.63 kN per millimetre of rolling-element complement mass is 64 g, or 0.14 g per mm² of the 30×15 mm track envelope — inertia that the drive must accelerate on every index of the cam the 10 mm pin bore sits in the miniature band; at 15 mm wide the NATV10-PP is built into compact cam drives, indexing pawls and light linkages NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 30 mm envelope for maximum C0 15.1 kN, guided axially by the outer-ring ribs The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 15 mm width covers most standard cam geometries -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 15 mm width. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 30 mm track diameter and 9.4 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 10 mm seat, and in cam drives and indexing tables the 64 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 15 mm width and the published 15.1 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 30 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATV10-PP?", "a": "The NATV10-PP is a NATV full-complement yoke-type track roller with axial guidance with 30 mm outside diameter, 10 mm bore and 15 mm width, envelope 10×30×15 mm. Mass is 64 g." }, { "q": "What does the NATV10-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV10-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×30×15 mm and the catalogue ratings are C 9.4 kN, C0 15.1 kN, Cur 2.08 kN." }, { "q": "What is the load capacity of the NATV10-PP?", "a": "The basic dynamic load rating C is 9.4 kN and the basic static load rating C0 is 15.1 kN; the fatigue load limit Cur is 2.08 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV10-PP?", "a": "HR1 lists a limiting speed of 2,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV10-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 30 mm outer surface tolerates only small angular error. The inner ring lets the 10 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV10", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV10-PP", "NATV10-PP" ], "locale_variants": {} }, { "sku": "NATR12", "brand": "FAG", "manufacturer_designation": "NATR12", "series": "natr-series", "type": "support_roller", "d_mm": 12, "D_mm": 32, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7, "static_load_kN": 9.2, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 71, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×32×15 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 7 kN and C0 9.2 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.32 kN at 12 mm bore, equivalent to 0.58 kN of dynamic rating per millimetre — the limiting speed is 4,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.47 kN per millimetre of rolling-element complement mass is 71 g, or 0.15 g per mm² of the 32×15 mm track envelope — inertia that the drive must accelerate on every index of the cam 12 mm pin bore and only 71 g: the smallest sizes demand accurate shaft geometry, because the 10.0 mm section leaves no tolerance for a soft or tapered seat The cage keeps the NATV at the higher limiting speed of 4,500 r/min for a track roller, with C 7 kN and C0 9.2 kN The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 15 mm width covers most standard cam geometries Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 32 mm track diameter and 7 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 12 mm seat, and in cam drives and indexing tables the 71 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 15 mm width and the published 9.2 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 32 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATR12?", "a": "The NATR12 is a NATR yoke-type track roller with cage and axial guidance with 32 mm outside diameter, 12 mm bore and 15 mm width, envelope 12×32×15 mm. Mass is 71 g." }, { "q": "What does the NATR12 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR12 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×15 mm and the catalogue ratings are C 7 kN, C0 9.2 kN, Cur 1.32 kN." }, { "q": "What is the load capacity of the NATR12?", "a": "The basic dynamic load rating C is 7 kN and the basic static load rating C0 is 9.2 kN; the fatigue load limit Cur is 1.32 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR12?", "a": "HR1 lists a limiting speed of 4,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR12?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The inner ring lets the 12 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR12-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR12", "NATR12" ], "locale_variants": {} }, { "sku": "NATR12-PP", "brand": "FAG", "manufacturer_designation": "NATR12-PP", "series": "natr-series", "type": "support_roller", "d_mm": 12, "D_mm": 32, "B_mm": 15, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7, "static_load_kN": 9.2, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 4500, "max_rpm": 4500, "weight_g": 66, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×32×15 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 7 kN and C0 9.2 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.32 kN at 12 mm bore, equivalent to 0.58 kN of dynamic rating per millimetre — the limiting speed is 4,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.47 kN per millimetre of rolling-element complement mass is 66 g, or 0.14 g per mm² of the 32×15 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm pin bore this is one of the smallest HR1 executions — chosen where a 32 mm envelope must carry line-contact loads that no miniature ball bearing could take At 12 mm bore and 66 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load The crowned outside surface of the 32 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading Reading -PP: rubbing seals at each face of the 32 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 32 mm track diameter and 7 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 12 mm seat, and in automotive welding jig rollers the 66 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 15 mm width and the published 9.2 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NATR12-PP?", "a": "The NATR12-PP is a NATR yoke-type track roller with cage and axial guidance with 32 mm outside diameter, 12 mm bore and 15 mm width, envelope 12×32×15 mm. Mass is 66 g." }, { "q": "What does the NATR12-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR12-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×15 mm and the catalogue ratings are C 7 kN, C0 9.2 kN, Cur 1.32 kN." }, { "q": "What is the load capacity of the NATR12-PP?", "a": "The basic dynamic load rating C is 7 kN and the basic static load rating C0 is 9.2 kN; the fatigue load limit Cur is 1.32 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR12-PP?", "a": "HR1 lists a limiting speed of 4,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR12-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The inner ring lets the 12 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR12", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR12-PP", "NATR12-PP" ], "locale_variants": {} }, { "sku": "NATV12", "brand": "FAG", "manufacturer_designation": "NATV12", "series": "natv-series", "type": "support_roller", "d_mm": 12, "D_mm": 32, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 9.7, "static_load_kN": 15.9, "fatigue_load_limit_kN": 2.21, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 72, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×32×15 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 9.7 kN and C0 15.9 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.61 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.21 kN at 12 mm bore, equivalent to 0.81 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.65 kN per millimetre of rolling-element complement mass is 72 g, or 0.15 g per mm² of the 32×15 mm track envelope — inertia that the drive must accelerate on every index of the cam the 12 mm pin bore sits in the miniature band; at 15 mm wide the NATV12 is built into compact cam drives, indexing pawls and light linkages Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the open execution is relubricated through the inner ring or pin NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 32 mm envelope for maximum C0 15.9 kN, guided axially by the outer-ring ribs Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 32 mm track diameter and 9.7 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 12 mm seat, and in conveyor transfer and diverting stations the 72 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 15 mm width and the published 15.9 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 32 mm outer ring does. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 32 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATV12?", "a": "The NATV12 is a NATV full-complement yoke-type track roller with axial guidance with 32 mm outside diameter, 12 mm bore and 15 mm width, envelope 12×32×15 mm. Mass is 72 g." }, { "q": "What does the NATV12 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV12 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×15 mm and the catalogue ratings are C 9.7 kN, C0 15.9 kN, Cur 2.21 kN." }, { "q": "What is the load capacity of the NATV12?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 15.9 kN; the fatigue load limit Cur is 2.21 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV12?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV12?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The inner ring lets the 12 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV12-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV12", "NATV12" ], "locale_variants": {} }, { "sku": "NATV12-PP", "brand": "FAG", "manufacturer_designation": "NATV12-PP", "series": "natv-series", "type": "support_roller", "d_mm": 12, "D_mm": 32, "B_mm": 15, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 9.7, "static_load_kN": 15.9, "fatigue_load_limit_kN": 2.21, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 69, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 12×32×15 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm bore — and the 15 mm width sets the contact width on the mating track the catalogue lists C 9.7 kN and C0 15.9 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.61 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.21 kN at 12 mm bore, equivalent to 0.81 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm bore takes the mounting pin or shaft; across the 15 mm contact width the dynamic rating works out to 0.65 kN per millimetre of rolling-element complement mass is 69 g, or 0.14 g per mm² of the 32×15 mm track envelope — inertia that the drive must accelerate on every index of the cam the 12 mm pin bore sits in the miniature band; at 15 mm wide the NATV12-PP is built into compact cam drives, indexing pawls and light linkages At 12 mm bore and 69 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the PP suffix adds lip seals on both sides and a life-long grease fill Reading -PP: rubbing seals at each face of the 32 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 32 mm track diameter and 9.7 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 12 mm seat, and in automotive welding jig rollers the 69 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 15 mm width and the published 15.9 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NATV12-PP?", "a": "The NATV12-PP is a NATV full-complement yoke-type track roller with axial guidance with 32 mm outside diameter, 12 mm bore and 15 mm width, envelope 12×32×15 mm. Mass is 69 g." }, { "q": "What does the NATV12-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV12-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×15 mm and the catalogue ratings are C 9.7 kN, C0 15.9 kN, Cur 2.21 kN." }, { "q": "What is the load capacity of the NATV12-PP?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 15.9 kN; the fatigue load limit Cur is 2.21 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV12-PP?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV12-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 32 mm outer surface tolerates only small angular error. The inner ring lets the 12 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV12", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV12-PP", "NATV12-PP" ], "locale_variants": {} }, { "sku": "NATR15", "brand": "FAG", "manufacturer_designation": "NATR15", "series": "natr-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.7, "static_load_kN": 14.5, "fatigue_load_limit_kN": 1.86, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 101, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×19 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 9.7 kN and C0 14.5 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.86 kN at 15 mm bore, equivalent to 0.65 kN of dynamic rating per millimetre — the limiting speed is 3,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.51 kN per millimetre of rolling-element complement mass is 101 g, or 0.15 g per mm² of the 35×19 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 15 mm pin bore the 19 mm width and 9.7 kN C rating suit high-cycle industrial machinery rather than instrument duty The cage keeps the NATV at the higher limiting speed of 3,600 r/min for a track roller, with C 9.7 kN and C0 14.5 kN Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the open execution is relubricated through the inner ring or pin Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 35 mm track diameter and 9.7 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 15 mm seat, and in linear rail and profile track guidance the 101 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 19 mm width and the published 14.5 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NATR15?", "a": "The NATR15 is a NATR yoke-type track roller with cage and axial guidance with 35 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×35×19 mm. Mass is 101 g." }, { "q": "What does the NATR15 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR15 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×35×19 mm and the catalogue ratings are C 9.7 kN, C0 14.5 kN, Cur 1.86 kN." }, { "q": "What is the load capacity of the NATR15?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 14.5 kN; the fatigue load limit Cur is 1.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR15?", "a": "HR1 lists a limiting speed of 3,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR15?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR15-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR15", "NATR15" ], "locale_variants": {} }, { "sku": "NATR15-PP", "brand": "FAG", "manufacturer_designation": "NATR15-PP", "series": "natr-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 19, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.7, "static_load_kN": 14.5, "fatigue_load_limit_kN": 1.86, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 95, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×19 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 9.7 kN and C0 14.5 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.86 kN at 15 mm bore, equivalent to 0.65 kN of dynamic rating per millimetre — the limiting speed is 3,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.51 kN per millimetre of rolling-element complement mass is 95 g, or 0.14 g per mm² of the 35×19 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 15 mm pin bore the 19 mm width and 9.7 kN C rating suit high-cycle industrial machinery rather than instrument duty The crowned outside surface of the 35 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 19 mm width covers most standard cam geometries The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 3,600 r/min limiting speed. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 35 mm track diameter and 9.7 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 15 mm seat, and in automatic assembly machine carriages the 95 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 19 mm width and the published 14.5 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATR15-PP?", "a": "The NATR15-PP is a NATR yoke-type track roller with cage and axial guidance with 35 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×35×19 mm. Mass is 95 g." }, { "q": "What does the NATR15-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR15-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×35×19 mm and the catalogue ratings are C 9.7 kN, C0 14.5 kN, Cur 1.86 kN." }, { "q": "What is the load capacity of the NATR15-PP?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 14.5 kN; the fatigue load limit Cur is 1.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR15-PP?", "a": "HR1 lists a limiting speed of 3,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR15-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR15", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR15-PP", "NATR15-PP" ], "locale_variants": {} }, { "sku": "NATV15", "brand": "FAG", "manufacturer_designation": "NATV15", "series": "natv-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 12.6, "static_load_kN": 23.4, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 109, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×19 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 12.6 kN and C0 23.4 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.25 kN at 15 mm bore, equivalent to 0.84 kN of dynamic rating per millimetre — the limiting speed is 1,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.66 kN per millimetre of rolling-element complement mass is 109 g, or 0.16 g per mm² of the 35×19 mm track envelope — inertia that the drive must accelerate on every index of the cam at 15 mm pin bore this size balances the 35 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range At 15 mm bore and 109 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load The crowned outside surface of the 35 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 35 mm track diameter and 12.6 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 15 mm seat, and in packaging machine timing mechanisms the 109 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 19 mm width and the published 23.4 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NATV15?", "a": "The NATV15 is a NATV full-complement yoke-type track roller with axial guidance with 35 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×35×19 mm. Mass is 109 g." }, { "q": "What does the NATV15 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV15 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×35×19 mm and the catalogue ratings are C 12.6 kN, C0 23.4 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the NATV15?", "a": "The basic dynamic load rating C is 12.6 kN and the basic static load rating C0 is 23.4 kN; the fatigue load limit Cur is 3.25 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV15?", "a": "HR1 lists a limiting speed of 1,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV15?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV15-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV15", "NATV15" ], "locale_variants": {} }, { "sku": "NATV15-PP", "brand": "FAG", "manufacturer_designation": "NATV15-PP", "series": "natv-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 19, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 12.6, "static_load_kN": 23.4, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 101, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×19 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 12.6 kN and C0 23.4 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.25 kN at 15 mm bore, equivalent to 0.84 kN of dynamic rating per millimetre — the limiting speed is 1,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.66 kN per millimetre of rolling-element complement mass is 101 g, or 0.15 g per mm² of the 35×19 mm track envelope — inertia that the drive must accelerate on every index of the cam the 15 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 19 mm width covers most standard cam geometries The crowned outside surface of the 35 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading Reading -PP: rubbing seals at each face of the 35 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 35 mm track diameter and 12.6 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 15 mm seat, and in automatic assembly machine carriages the 101 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 19 mm width and the published 23.4 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NATV15-PP?", "a": "The NATV15-PP is a NATV full-complement yoke-type track roller with axial guidance with 35 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×35×19 mm. Mass is 101 g." }, { "q": "What does the NATV15-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV15-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×35×19 mm and the catalogue ratings are C 12.6 kN, C0 23.4 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the NATV15-PP?", "a": "The basic dynamic load rating C is 12.6 kN and the basic static load rating C0 is 23.4 kN; the fatigue load limit Cur is 3.25 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV15-PP?", "a": "HR1 lists a limiting speed of 1,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV15-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV15", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV15-PP", "NATV15-PP" ], "locale_variants": {} }, { "sku": "NATR17", "brand": "FAG", "manufacturer_designation": "NATR17", "series": "natr-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.9, "static_load_kN": 16, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 144, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×21 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 10.9 kN and C0 16 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.13 kN at 17 mm bore, equivalent to 0.64 kN of dynamic rating per millimetre — the limiting speed is 2,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.52 kN per millimetre of rolling-element complement mass is 144 g, or 0.17 g per mm² of the 40×21 mm track envelope — inertia that the drive must accelerate on every index of the cam at 17 mm pin bore this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The cage can be damaged by heavy shock loads even though the rollers would survive — size to C, not just envelope Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 40 mm track diameter and 10.9 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 17 mm seat, and in automotive welding jig rollers the 144 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 21 mm width and the published 16 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NATR17?", "a": "The NATR17 is a NATR yoke-type track roller with cage and axial guidance with 40 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×40×21 mm. Mass is 144 g." }, { "q": "What does the NATR17 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR17 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×40×21 mm and the catalogue ratings are C 10.9 kN, C0 16 kN, Cur 2.13 kN." }, { "q": "What is the load capacity of the NATR17?", "a": "The basic dynamic load rating C is 10.9 kN and the basic static load rating C0 is 16 kN; the fatigue load limit Cur is 2.13 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR17?", "a": "HR1 lists a limiting speed of 2,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR17?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR17-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR17", "NATR17" ], "locale_variants": {} }, { "sku": "NATR17-PP", "brand": "FAG", "manufacturer_designation": "NATR17-PP", "series": "natr-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 21, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.9, "static_load_kN": 16, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 139, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×21 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 10.9 kN and C0 16 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.13 kN at 17 mm bore, equivalent to 0.64 kN of dynamic rating per millimetre — the limiting speed is 2,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.52 kN per millimetre of rolling-element complement mass is 139 g, or 0.17 g per mm² of the 40×21 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 17 mm pin bore the 21 mm width and 10.9 kN C rating suit high-cycle industrial machinery rather than instrument duty NATR is the caged yoke-type track roller: a needle roller and cage assembly runs inside the rib-guided thick-walled outer ring on the 17 mm inner-ring bore -PP protection suits cams and rails that are washed down or run in dust; exceeding the 2,900 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 40 mm track diameter and 10.9 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 17 mm seat, and in automotive welding jig rollers the 139 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 21 mm width and the published 16 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NATR17-PP?", "a": "The NATR17-PP is a NATR yoke-type track roller with cage and axial guidance with 40 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×40×21 mm. Mass is 139 g." }, { "q": "What does the NATR17-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR17-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×40×21 mm and the catalogue ratings are C 10.9 kN, C0 16 kN, Cur 2.13 kN." }, { "q": "What is the load capacity of the NATR17-PP?", "a": "The basic dynamic load rating C is 10.9 kN and the basic static load rating C0 is 16 kN; the fatigue load limit Cur is 2.13 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR17-PP?", "a": "HR1 lists a limiting speed of 2,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR17-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR17", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR17-PP", "NATR17-PP" ], "locale_variants": {} }, { "sku": "NATV17", "brand": "FAG", "manufacturer_designation": "NATV17", "series": "natv-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 14.7, "static_load_kN": 27, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 152, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×21 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 14.7 kN and C0 27 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.55 kN at 17 mm bore, equivalent to 0.86 kN of dynamic rating per millimetre — the limiting speed is 1,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.70 kN per millimetre of rolling-element complement mass is 152 g, or 0.18 g per mm² of the 40×21 mm track envelope — inertia that the drive must accelerate on every index of the cam the 17 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Without a cage the NATV trades speed for static capacity — the limiting speed is 1,400 r/min, with C 14.7 kN and C0 27 kN NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 40 mm envelope for maximum C0 27 kN, guided axially by the outer-ring ribs Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 40 mm track diameter and 14.7 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 17 mm seat, and in cam drives and indexing tables the 152 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 21 mm width and the published 27 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NATV17?", "a": "The NATV17 is a NATV full-complement yoke-type track roller with axial guidance with 40 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×40×21 mm. Mass is 152 g." }, { "q": "What does the NATV17 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV17 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×40×21 mm and the catalogue ratings are C 14.7 kN, C0 27 kN, Cur 3.55 kN." }, { "q": "What is the load capacity of the NATV17?", "a": "The basic dynamic load rating C is 14.7 kN and the basic static load rating C0 is 27 kN; the fatigue load limit Cur is 3.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV17?", "a": "HR1 lists a limiting speed of 1,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV17?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV17-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV17", "NATV17" ], "locale_variants": {} }, { "sku": "NATV17-PP", "brand": "FAG", "manufacturer_designation": "NATV17-PP", "series": "natv-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 21, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 14.7, "static_load_kN": 27, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×21 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 14.7 kN and C0 27 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.55 kN at 17 mm bore, equivalent to 0.86 kN of dynamic rating per millimetre — the limiting speed is 1,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.70 kN per millimetre of rolling-element complement mass is 147 g, or 0.17 g per mm² of the 40×21 mm track envelope — inertia that the drive must accelerate on every index of the cam the 17 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The cageless rollers can brinell on very short oscillating strokes — the motion must rotate the full pack, not just rock it At 17 mm bore and 147 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load -PP protection suits cams and rails that are washed down or run in dust; exceeding the 1,400 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 40 mm track diameter and 14.7 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 17 mm seat, and in automotive welding jig rollers the 147 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 21 mm width and the published 27 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NATV17-PP?", "a": "The NATV17-PP is a NATV full-complement yoke-type track roller with axial guidance with 40 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×40×21 mm. Mass is 147 g." }, { "q": "What does the NATV17-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV17-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×40×21 mm and the catalogue ratings are C 14.7 kN, C0 27 kN, Cur 3.55 kN." }, { "q": "What is the load capacity of the NATV17-PP?", "a": "The basic dynamic load rating C is 14.7 kN and the basic static load rating C0 is 27 kN; the fatigue load limit Cur is 3.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV17-PP?", "a": "HR1 lists a limiting speed of 1,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV17-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV17", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV17-PP", "NATV17-PP" ], "locale_variants": {} }, { "sku": "NATR20", "brand": "FAG", "manufacturer_designation": "NATR20", "series": "natr-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.4, "static_load_kN": 26, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 246, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×25 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 15.4 kN and C0 26 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.45 kN at 20 mm bore, equivalent to 0.77 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.62 kN per millimetre of rolling-element complement mass is 246 g, or 0.21 g per mm² of the 47×25 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm pin bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The cage keeps the NATV at the higher limiting speed of 2,400 r/min for a track roller, with C 15.4 kN and C0 26 kN Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the open execution is relubricated through the inner ring or pin Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 47 mm track diameter and 15.4 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 20 mm seat, and in automatic assembly machine carriages the 246 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 25 mm width and the published 26 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NATR20?", "a": "The NATR20 is a NATR yoke-type track roller with cage and axial guidance with 47 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×47×25 mm. Mass is 246 g." }, { "q": "What does the NATR20 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR20 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×25 mm and the catalogue ratings are C 15.4 kN, C0 26 kN, Cur 3.45 kN." }, { "q": "What is the load capacity of the NATR20?", "a": "The basic dynamic load rating C is 15.4 kN and the basic static load rating C0 is 26 kN; the fatigue load limit Cur is 3.45 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR20?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR20?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR20-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR20", "NATR20" ], "locale_variants": {} }, { "sku": "NATR20-PP", "brand": "FAG", "manufacturer_designation": "NATR20-PP", "series": "natr-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.4, "static_load_kN": 26, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 236, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×25 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 15.4 kN and C0 26 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.45 kN at 20 mm bore, equivalent to 0.77 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.62 kN per millimetre of rolling-element complement mass is 236 g, or 0.20 g per mm² of the 47×25 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The cage can be damaged by heavy shock loads even though the rollers would survive — size to C, not just envelope The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 25 mm width covers most standard cam geometries Reading -PP: rubbing seals at each face of the 47 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 47 mm track diameter and 15.4 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 20 mm seat, and in woodworking machine feed tracks the 236 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 25 mm width and the published 26 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 47 mm outer ring does.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 47 mm outer ring does.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NATR20-PP?", "a": "The NATR20-PP is a NATR yoke-type track roller with cage and axial guidance with 47 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×47×25 mm. Mass is 236 g." }, { "q": "What does the NATR20-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR20-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×25 mm and the catalogue ratings are C 15.4 kN, C0 26 kN, Cur 3.45 kN." }, { "q": "What is the load capacity of the NATR20-PP?", "a": "The basic dynamic load rating C is 15.4 kN and the basic static load rating C0 is 26 kN; the fatigue load limit Cur is 3.45 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR20-PP?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR20-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR20", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR20-PP", "NATR20-PP" ], "locale_variants": {} }, { "sku": "NATV20", "brand": "FAG", "manufacturer_designation": "NATV20", "series": "natv-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 20.3, "static_load_kN": 42.5, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 254, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×25 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 20.3 kN and C0 42.5 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.48 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 20 mm bore, equivalent to 1.02 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.81 kN per millimetre of rolling-element complement mass is 254 g, or 0.22 g per mm² of the 47×25 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The crowned outside surface of the 47 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the open execution is relubricated through the inner ring or pin Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 47 mm track diameter and 20.3 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 20 mm seat, and in woodworking machine feed tracks the 254 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 25 mm width and the published 42.5 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the NATV20?", "a": "The NATV20 is a NATV full-complement yoke-type track roller with axial guidance with 47 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×47×25 mm. Mass is 254 g." }, { "q": "What does the NATV20 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV20 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×25 mm and the catalogue ratings are C 20.3 kN, C0 42.5 kN, Cur 6 kN." }, { "q": "What is the load capacity of the NATV20?", "a": "The basic dynamic load rating C is 20.3 kN and the basic static load rating C0 is 42.5 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV20?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV20?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV20-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV20", "NATV20" ], "locale_variants": {} }, { "sku": "NATV20-PP", "brand": "FAG", "manufacturer_designation": "NATV20-PP", "series": "natv-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 20.3, "static_load_kN": 42.5, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 245, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×25 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 20.3 kN and C0 42.5 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.48 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 20 mm bore, equivalent to 1.02 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.81 kN per millimetre of rolling-element complement mass is 245 g, or 0.21 g per mm² of the 47×25 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm pin bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The crowned outside surface of the 47 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading At 20 mm bore and 245 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 1,300 r/min limiting speed. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 47 mm track diameter and 20.3 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 20 mm seat, and in woodworking machine feed tracks the 245 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 25 mm width and the published 42.5 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 47 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATV20-PP?", "a": "The NATV20-PP is a NATV full-complement yoke-type track roller with axial guidance with 47 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×47×25 mm. Mass is 245 g." }, { "q": "What does the NATV20-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV20-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×25 mm and the catalogue ratings are C 20.3 kN, C0 42.5 kN, Cur 6 kN." }, { "q": "What is the load capacity of the NATV20-PP?", "a": "The basic dynamic load rating C is 20.3 kN and the basic static load rating C0 is 42.5 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV20-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV20-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV20", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV20-PP", "NATV20-PP" ], "locale_variants": {} }, { "sku": "NATR25", "brand": "FAG", "manufacturer_designation": "NATR25", "series": "natr-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.3, "static_load_kN": 27, "fatigue_load_limit_kN": 3.6, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 275, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 15.3 kN and C0 27 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.57 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.6 kN at 25 mm bore, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.61 kN per millimetre of rolling-element complement mass is 275 g, or 0.21 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam the 25 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty At 25 mm bore and 275 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load NATR is the caged yoke-type track roller: a needle roller and cage assembly runs inside the rib-guided thick-walled outer ring on the 25 mm inner-ring bore Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 52 mm track diameter and 15.3 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 25 mm seat, and in packaging machine timing mechanisms the 275 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 25 mm width and the published 27 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATR25?", "a": "The NATR25 is a NATR yoke-type track roller with cage and axial guidance with 52 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×52×25 mm. Mass is 275 g." }, { "q": "What does the NATR25 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR25 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×25 mm and the catalogue ratings are C 15.3 kN, C0 27 kN, Cur 3.6 kN." }, { "q": "What is the load capacity of the NATR25?", "a": "The basic dynamic load rating C is 15.3 kN and the basic static load rating C0 is 27 kN; the fatigue load limit Cur is 3.6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR25?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR25?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR25-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR25", "NATR25" ], "locale_variants": {} }, { "sku": "NATR25-PP", "brand": "FAG", "manufacturer_designation": "NATR25-PP", "series": "natr-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.3, "static_load_kN": 27, "fatigue_load_limit_kN": 3.6, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 271, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 15.3 kN and C0 27 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.57 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.6 kN at 25 mm bore, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.61 kN per millimetre of rolling-element complement mass is 271 g, or 0.21 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 25 mm pin bore the 25 mm width and 15.3 kN C rating suit high-cycle industrial machinery rather than instrument duty The cage can be damaged by heavy shock loads even though the rollers would survive — size to C, not just envelope The cage keeps the NATV at the higher limiting speed of 1,800 r/min for a track roller, with C 15.3 kN and C0 27 kN -PP protection suits cams and rails that are washed down or run in dust; exceeding the 1,800 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 52 mm track diameter and 15.3 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 25 mm seat, and in woodworking machine feed tracks the 271 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 25 mm width and the published 27 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NATR25-PP?", "a": "The NATR25-PP is a NATR yoke-type track roller with cage and axial guidance with 52 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×52×25 mm. Mass is 271 g." }, { "q": "What does the NATR25-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR25-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×25 mm and the catalogue ratings are C 15.3 kN, C0 27 kN, Cur 3.6 kN." }, { "q": "What is the load capacity of the NATR25-PP?", "a": "The basic dynamic load rating C is 15.3 kN and the basic static load rating C0 is 27 kN; the fatigue load limit Cur is 3.6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR25-PP?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR25-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR25", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR25-PP", "NATR25-PP" ], "locale_variants": {} }, { "sku": "NATV25", "brand": "FAG", "manufacturer_designation": "NATV25", "series": "natv-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 20.2, "static_load_kN": 44.5, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 285, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 20.2 kN and C0 44.5 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.45 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6.3 kN at 25 mm bore, equivalent to 0.81 kN of dynamic rating per millimetre — the limiting speed is 1,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.81 kN per millimetre of rolling-element complement mass is 285 g, or 0.22 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 25 mm pin bore the 25 mm width and 20.2 kN C rating suit high-cycle industrial machinery rather than instrument duty At 25 mm bore and 285 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 52 mm track diameter and 20.2 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 25 mm seat, and in automatic assembly machine carriages the 285 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 25 mm width and the published 44.5 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATV25?", "a": "The NATV25 is a NATV full-complement yoke-type track roller with axial guidance with 52 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×52×25 mm. Mass is 285 g." }, { "q": "What does the NATV25 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV25 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×25 mm and the catalogue ratings are C 20.2 kN, C0 44.5 kN, Cur 6.3 kN." }, { "q": "What is the load capacity of the NATV25?", "a": "The basic dynamic load rating C is 20.2 kN and the basic static load rating C0 is 44.5 kN; the fatigue load limit Cur is 6.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV25?", "a": "HR1 lists a limiting speed of 1,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV25?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV25-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV25", "NATV25" ], "locale_variants": {} }, { "sku": "NATV25-PP", "brand": "FAG", "manufacturer_designation": "NATV25-PP", "series": "natv-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 20.2, "static_load_kN": 44.5, "fatigue_load_limit_kN": 6.3, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 281, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 20.2 kN and C0 44.5 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.45 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6.3 kN at 25 mm bore, equivalent to 0.81 kN of dynamic rating per millimetre — the limiting speed is 1,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.81 kN per millimetre of rolling-element complement mass is 281 g, or 0.22 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam the 25 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 52 mm envelope for maximum C0 44.5 kN, guided axially by the outer-ring ribs Without a cage the NATV trades speed for static capacity — the limiting speed is 1,000 r/min, with C 20.2 kN and C0 44.5 kN The PP seals make this a maintenance-free unit: the 20.2 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 52 mm track diameter and 20.2 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 25 mm seat, and in woodworking machine feed tracks the 281 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 25 mm width and the published 44.5 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NATV25-PP?", "a": "The NATV25-PP is a NATV full-complement yoke-type track roller with axial guidance with 52 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×52×25 mm. Mass is 281 g." }, { "q": "What does the NATV25-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV25-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×25 mm and the catalogue ratings are C 20.2 kN, C0 44.5 kN, Cur 6.3 kN." }, { "q": "What is the load capacity of the NATV25-PP?", "a": "The basic dynamic load rating C is 20.2 kN and the basic static load rating C0 is 44.5 kN; the fatigue load limit Cur is 6.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV25-PP?", "a": "HR1 lists a limiting speed of 1,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV25-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV25", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV25-PP", "NATV25-PP" ], "locale_variants": {} }, { "sku": "NATR30", "brand": "FAG", "manufacturer_designation": "NATR30", "series": "natr-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.2, "static_load_kN": 39.5, "fatigue_load_limit_kN": 5.3, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×29 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 23.2 kN and C0 39.5 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.3 kN at 30 mm bore, equivalent to 0.77 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 0.80 kN per millimetre of rolling-element complement mass is 470 g, or 0.26 g per mm² of the 62×29 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 30 mm pin bore the 29 mm width and 23.2 kN C rating suit high-cycle industrial machinery rather than instrument duty Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the open execution is relubricated through the inner ring or pin At 30 mm bore and 470 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 62 mm track diameter and 23.2 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 30 mm seat, and in woodworking machine feed tracks the 470 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 29 mm width and the published 39.5 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NATR30?", "a": "The NATR30 is a NATR yoke-type track roller with cage and axial guidance with 62 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×62×29 mm. Mass is 470 g." }, { "q": "What does the NATR30 designation mean in the FAG/INA HR1 catalogue?", "a": "NATR30 identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×62×29 mm and the catalogue ratings are C 23.2 kN, C0 39.5 kN, Cur 5.3 kN." }, { "q": "What is the load capacity of the NATR30?", "a": "The basic dynamic load rating C is 23.2 kN and the basic static load rating C0 is 39.5 kN; the fatigue load limit Cur is 5.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR30?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR30?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR30-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR30", "NATR30" ], "locale_variants": {} }, { "sku": "NATR30-PP", "brand": "FAG", "manufacturer_designation": "NATR30-PP", "series": "natr-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 23.2, "static_load_kN": 39.5, "fatigue_load_limit_kN": 5.3, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 444, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×29 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 23.2 kN and C0 39.5 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.3 kN at 30 mm bore, equivalent to 0.77 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 0.80 kN per millimetre of rolling-element complement mass is 444 g, or 0.25 g per mm² of the 62×29 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The cage can be damaged by heavy shock loads even though the rollers would survive — size to C, not just envelope NATR is the caged yoke-type track roller: a needle roller and cage assembly runs inside the rib-guided thick-walled outer ring on the 30 mm inner-ring bore The PP seals make this a maintenance-free unit: the 23.2 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 62 mm track diameter and 23.2 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 30 mm seat, and in automotive welding jig rollers the 444 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 29 mm width and the published 39.5 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATR30-PP?", "a": "The NATR30-PP is a NATR yoke-type track roller with cage and axial guidance with 62 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×62×29 mm. Mass is 444 g." }, { "q": "What does the NATR30-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR30-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×62×29 mm and the catalogue ratings are C 23.2 kN, C0 39.5 kN, Cur 5.3 kN." }, { "q": "What is the load capacity of the NATR30-PP?", "a": "The basic dynamic load rating C is 23.2 kN and the basic static load rating C0 is 39.5 kN; the fatigue load limit Cur is 5.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR30-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR30-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR30", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR30-PP", "NATR30-PP" ], "locale_variants": {} }, { "sku": "NATV30", "brand": "FAG", "manufacturer_designation": "NATV30", "series": "natv-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 30, "static_load_kN": 63, "fatigue_load_limit_kN": 9, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 481, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×29 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 30 kN and C0 63 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.48 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 9 kN at 30 mm bore, equivalent to 1.00 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.03 kN per millimetre of rolling-element complement mass is 481 g, or 0.27 g per mm² of the 62×29 mm track envelope — inertia that the drive must accelerate on every index of the cam at 30 mm pin bore this size balances the 62 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range At 30 mm bore and 481 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 62 mm track diameter and 30 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 30 mm seat, and in automotive welding jig rollers the 481 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 29 mm width and the published 63 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 62 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATV30?", "a": "The NATV30 is a NATV full-complement yoke-type track roller with axial guidance with 62 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×62×29 mm. Mass is 481 g." }, { "q": "What does the NATV30 designation mean in the FAG/INA HR1 catalogue?", "a": "NATV30 identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×62×29 mm and the catalogue ratings are C 30 kN, C0 63 kN, Cur 9 kN." }, { "q": "What is the load capacity of the NATV30?", "a": "The basic dynamic load rating C is 30 kN and the basic static load rating C0 is 63 kN; the fatigue load limit Cur is 9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV30?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV30?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV30-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV30", "NATV30" ], "locale_variants": {} }, { "sku": "NATV30-PP", "brand": "FAG", "manufacturer_designation": "NATV30-PP", "series": "natv-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 30, "static_load_kN": 63, "fatigue_load_limit_kN": 9, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 468, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×29 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 30 kN and C0 63 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.48 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 9 kN at 30 mm bore, equivalent to 1.00 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.03 kN per millimetre of rolling-element complement mass is 468 g, or 0.26 g per mm² of the 62×29 mm track envelope — inertia that the drive must accelerate on every index of the cam at 30 mm pin bore this size balances the 62 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Without a cage the NATV trades speed for static capacity — the limiting speed is 850 r/min, with C 30 kN and C0 63 kN The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 850 r/min limiting speed. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 62 mm track diameter and 30 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 30 mm seat, and in automotive welding jig rollers the 468 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 29 mm width and the published 63 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NATV30-PP?", "a": "The NATV30-PP is a NATV full-complement yoke-type track roller with axial guidance with 62 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×62×29 mm. Mass is 468 g." }, { "q": "What does the NATV30-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV30-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×62×29 mm and the catalogue ratings are C 30 kN, C0 63 kN, Cur 9 kN." }, { "q": "What is the load capacity of the NATV30-PP?", "a": "The basic dynamic load rating C is 30 kN and the basic static load rating C0 is 63 kN; the fatigue load limit Cur is 9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV30-PP?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV30-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV30", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV30-PP", "NATV30-PP" ], "locale_variants": {} }, { "sku": "NATR35-PP", "brand": "FAG", "manufacturer_designation": "NATR35-PP", "series": "natr-series", "type": "support_roller", "d_mm": 35, "D_mm": 72, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 24.8, "static_load_kN": 45, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 1000, "max_rpm": 1000, "weight_g": 547, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×72×29 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 24.8 kN and C0 45 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.55 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 35 mm bore, equivalent to 0.71 kN of dynamic rating per millimetre — the limiting speed is 1,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 0.86 kN per millimetre of rolling-element complement mass is 547 g, or 0.26 g per mm² of the 72×29 mm track envelope — inertia that the drive must accelerate on every index of the cam 35 mm pin bore marks the medium range: mounting forces and fits become critical, and the 547 g mass calls for proper induction or press tooling rather than hand fitting At 35 mm bore and 547 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load NATR is the caged yoke-type track roller: a needle roller and cage assembly runs inside the rib-guided thick-walled outer ring on the 35 mm inner-ring bore -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 29 mm width. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 72 mm track diameter and 24.8 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 35 mm seat, and in automotive welding jig rollers the 547 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 29 mm width and the published 45 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATR35-PP?", "a": "The NATR35-PP is a NATR yoke-type track roller with cage and axial guidance with 72 mm outside diameter, 35 mm bore and 29 mm width, envelope 35×72×29 mm. Mass is 547 g." }, { "q": "What does the NATR35-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR35-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 35×72×29 mm and the catalogue ratings are C 24.8 kN, C0 45 kN, Cur 6 kN." }, { "q": "What is the load capacity of the NATR35-PP?", "a": "The basic dynamic load rating C is 24.8 kN and the basic static load rating C0 is 45 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR35-PP?", "a": "HR1 lists a limiting speed of 1,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR35-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR35", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR35-PP", "NATR35-PP" ], "locale_variants": {} }, { "sku": "NATV35-PP", "brand": "FAG", "manufacturer_designation": "NATV35-PP", "series": "natv-series", "type": "support_roller", "d_mm": 35, "D_mm": 72, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 32.5, "static_load_kN": 72, "fatigue_load_limit_kN": 10.3, "limiting_speed_rpm": 750, "max_rpm": 750, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×72×29 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 32.5 kN and C0 72 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.45 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 10.3 kN at 35 mm bore, equivalent to 0.93 kN of dynamic rating per millimetre — the limiting speed is 750 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.12 kN per millimetre of rolling-element complement mass is 630 g, or 0.30 g per mm² of the 72×29 mm track envelope — inertia that the drive must accelerate on every index of the cam the 35 mm pin bore places this bearing in the medium band, where the 72 mm envelope already carries ratings in the tens of kilonewtons NATV is the full-complement yoke-type track roller: cageless needle rollers pack the 72 mm envelope for maximum C0 72 kN, guided axially by the outer-ring ribs The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 29 mm width covers most standard cam geometries -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 29 mm width. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 72 mm track diameter and 32.5 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 35 mm seat, and in automotive welding jig rollers the 630 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 29 mm width and the published 72 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 72 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATV35-PP?", "a": "The NATV35-PP is a NATV full-complement yoke-type track roller with axial guidance with 72 mm outside diameter, 35 mm bore and 29 mm width, envelope 35×72×29 mm. Mass is 630 g." }, { "q": "What does the NATV35-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV35-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 35×72×29 mm and the catalogue ratings are C 32.5 kN, C0 72 kN, Cur 10.3 kN." }, { "q": "What is the load capacity of the NATV35-PP?", "a": "The basic dynamic load rating C is 32.5 kN and the basic static load rating C0 is 72 kN; the fatigue load limit Cur is 10.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV35-PP?", "a": "HR1 lists a limiting speed of 750 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV35-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV35", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV35-PP", "NATV35-PP" ], "locale_variants": {} }, { "sku": "NATR40-PP", "brand": "FAG", "manufacturer_designation": "NATR40-PP", "series": "natr-series", "type": "support_roller", "d_mm": 40, "D_mm": 80, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 32, "static_load_kN": 59, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 795, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×80×32 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 32 kN and C0 59 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.4 kN at 40 mm bore, equivalent to 0.80 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.00 kN per millimetre of rolling-element complement mass is 795 g, or 0.31 g per mm² of the 80×32 mm track envelope — inertia that the drive must accelerate on every index of the cam the 40 mm pin bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons At 40 mm bore and 795 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load -PP protection suits cams and rails that are washed down or run in dust; exceeding the 850 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 80 mm track diameter and 32 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 40 mm seat, and in cam drives and indexing tables the 795 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 32 mm width and the published 59 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 80 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NATR40-PP?", "a": "The NATR40-PP is a NATR yoke-type track roller with cage and axial guidance with 80 mm outside diameter, 40 mm bore and 32 mm width, envelope 40×80×32 mm. Mass is 795 g." }, { "q": "What does the NATR40-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR40-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 40×80×32 mm and the catalogue ratings are C 32 kN, C0 59 kN, Cur 8.4 kN." }, { "q": "What is the load capacity of the NATR40-PP?", "a": "The basic dynamic load rating C is 32 kN and the basic static load rating C0 is 59 kN; the fatigue load limit Cur is 8.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR40-PP?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR40-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR40", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR40-PP", "NATR40-PP" ], "locale_variants": {} }, { "sku": "NATV40-PP", "brand": "FAG", "manufacturer_designation": "NATV40-PP", "series": "natv-series", "type": "support_roller", "d_mm": 40, "D_mm": 80, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 40, "static_load_kN": 89, "fatigue_load_limit_kN": 13.2, "limiting_speed_rpm": 650, "max_rpm": 650, "weight_g": 832, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×80×32 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 40 kN and C0 89 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.45 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 13.2 kN at 40 mm bore, equivalent to 1.00 kN of dynamic rating per millimetre — the limiting speed is 650 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.25 kN per millimetre of rolling-element complement mass is 832 g, or 0.33 g per mm² of the 80×32 mm track envelope — inertia that the drive must accelerate on every index of the cam at 40 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 32 mm width as a standard mounting space The cageless rollers can brinell on very short oscillating strokes — the motion must rotate the full pack, not just rock it At 40 mm bore and 832 g the roller mounts on a standard pin; yoke mounting means the pin, not a stud, carries the clamp load Reading -PP: rubbing seals at each face of the 80 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 80 mm track diameter and 40 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 40 mm seat, and in cam drives and indexing tables the 832 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 32 mm width and the published 89 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NATV40-PP?", "a": "The NATV40-PP is a NATV full-complement yoke-type track roller with axial guidance with 80 mm outside diameter, 40 mm bore and 32 mm width, envelope 40×80×32 mm. Mass is 832 g." }, { "q": "What does the NATV40-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV40-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 40×80×32 mm and the catalogue ratings are C 40 kN, C0 89 kN, Cur 13.2 kN." }, { "q": "What is the load capacity of the NATV40-PP?", "a": "The basic dynamic load rating C is 40 kN and the basic static load rating C0 is 89 kN; the fatigue load limit Cur is 13.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV40-PP?", "a": "HR1 lists a limiting speed of 650 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV40-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV40", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV40-PP", "NATV40-PP" ], "locale_variants": {} }, { "sku": "NATR50-PP", "brand": "FAG", "manufacturer_designation": "NATR50-PP", "series": "natr-series", "type": "support_roller", "d_mm": 50, "D_mm": 90, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 31, "static_load_kN": 60, "fatigue_load_limit_kN": 8.5, "limiting_speed_rpm": 650, "max_rpm": 650, "weight_g": 867, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×90×32 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 31 kN and C0 60 kN for the NATR yoke-type track roller with cage and axial guidance; the C/C0 ratio of 0.52 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.5 kN at 50 mm bore, equivalent to 0.62 kN of dynamic rating per millimetre — the limiting speed is 650 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 0.97 kN per millimetre of rolling-element complement mass is 867 g, or 0.30 g per mm² of the 90×32 mm track envelope — inertia that the drive must accelerate on every index of the cam the 50 mm pin bore places this bearing in the medium band, where the 90 mm envelope already carries ratings in the tens of kilonewtons The outer-ring ribs give axial guidance, so the roller tolerates light thrust from skewed tracks without external flanges; the 32 mm width covers most standard cam geometries Reading -PP: rubbing seals at each face of the 90 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 90 mm track diameter and 31 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 50 mm seat, and in woodworking machine feed tracks the 867 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 32 mm width and the published 60 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NATR50-PP?", "a": "The NATR50-PP is a NATR yoke-type track roller with cage and axial guidance with 90 mm outside diameter, 50 mm bore and 32 mm width, envelope 50×90×32 mm. Mass is 867 g." }, { "q": "What does the NATR50-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATR50-PP identifies this NATR yoke-type track roller with cage and axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 50×90×32 mm and the catalogue ratings are C 31 kN, C0 60 kN, Cur 8.5 kN." }, { "q": "What is the load capacity of the NATR50-PP?", "a": "The basic dynamic load rating C is 31 kN and the basic static load rating C0 is 60 kN; the fatigue load limit Cur is 8.5 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATR50-PP?", "a": "HR1 lists a limiting speed of 650 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATR50-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATR50", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATR50-PP", "NATR50-PP" ], "locale_variants": {} }, { "sku": "NATV50-PP", "brand": "FAG", "manufacturer_designation": "NATV50-PP", "series": "natv-series", "type": "support_roller", "d_mm": 50, "D_mm": 90, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 39, "static_load_kN": 93, "fatigue_load_limit_kN": 13.8, "limiting_speed_rpm": 550, "max_rpm": 550, "weight_g": 969, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×90×32 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 39 kN and C0 93 kN for the NATV full-complement yoke-type track roller with axial guidance; the C/C0 ratio of 0.42 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 13.8 kN at 50 mm bore, equivalent to 0.78 kN of dynamic rating per millimetre — the limiting speed is 550 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.22 kN per millimetre of rolling-element complement mass is 969 g, or 0.34 g per mm² of the 90×32 mm track envelope — inertia that the drive must accelerate on every index of the cam at 50 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 32 mm width as a standard mounting space The crowned outside surface of the 90 mm outer ring spreads contact stress when the cam track departs slightly from parallel, reducing edge loading Reading NATR/NATV: yoke rollers with inner ring and integral axial guidance; the PP suffix adds lip seals on both sides and a life-long grease fill Reading -PP: rubbing seals at each face of the 90 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 90 mm track diameter and 39 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 50 mm seat, and in woodworking machine feed tracks the 969 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 32 mm width and the published 93 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the NATV50-PP?", "a": "The NATV50-PP is a NATV full-complement yoke-type track roller with axial guidance with 90 mm outside diameter, 50 mm bore and 32 mm width, envelope 50×90×32 mm. Mass is 969 g." }, { "q": "What does the NATV50-PP designation mean in the FAG/INA HR1 catalogue?", "a": "NATV50-PP identifies this NATV full-complement yoke-type track roller with axial guidance in the Schaeffler HR1 rolling bearings catalogue. The envelope is 50×90×32 mm and the catalogue ratings are C 39 kN, C0 93 kN, Cur 13.8 kN." }, { "q": "What is the load capacity of the NATV50-PP?", "a": "The basic dynamic load rating C is 39 kN and the basic static load rating C0 is 93 kN; the fatigue load limit Cur is 13.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NATV50-PP?", "a": "HR1 lists a limiting speed of 550 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NATV50-PP?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NATV50", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1450", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NATV50-PP", "NATV50-PP" ], "locale_variants": {} }, { "sku": "NUTR15", "brand": "FAG", "manufacturer_designation": "NUTR15", "series": "nutr-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 15.3, "static_load_kN": 19, "fatigue_load_limit_kN": 2.48, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 99, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×19 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 15.3 kN and C0 19 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.81 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.48 kN at 15 mm bore, equivalent to 1.02 kN of dynamic rating per millimetre — the limiting speed is 6,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.81 kN per millimetre of rolling-element complement mass is 99 g, or 0.15 g per mm² of the 35×19 mm track envelope — inertia that the drive must accelerate on every index of the cam the 15 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Two roller rows across the 19 mm width provide C 15.3 kN and C0 19 kN, with the thick outer ring profiled to tolerate track misalignment The 15 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 19 kN static rating Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 35 mm track diameter and 15.3 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 15 mm seat, and in linear rail and profile track guidance the 99 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 19 mm width and the published 19 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 35 mm outer ring does.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NUTR15?", "a": "The NUTR15 is a NUTR double-row full-complement yoke-type track roller with 35 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×35×19 mm. Mass is 99 g." }, { "q": "What does the NUTR15 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR15 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×35×19 mm and the catalogue ratings are C 15.3 kN, C0 19 kN, Cur 2.48 kN." }, { "q": "What is the load capacity of the NUTR15?", "a": "The basic dynamic load rating C is 15.3 kN and the basic static load rating C0 is 19 kN; the fatigue load limit Cur is 2.48 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR15?", "a": "HR1 lists a limiting speed of 6,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR15?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR15", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR15", "NUTR15" ], "locale_variants": {} }, { "sku": "PWTR15-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR15-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 15, "D_mm": 35, "B_mm": 19, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 12.6, "static_load_kN": 14.9, "fatigue_load_limit_kN": 1.79, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 99, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×35×19 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 12.6 kN and C0 14.9 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.85 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.79 kN at 15 mm bore, equivalent to 0.84 kN of dynamic rating per millimetre — the limiting speed is 6,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.66 kN per millimetre of rolling-element complement mass is 99 g, or 0.15 g per mm² of the 35×19 mm track envelope — inertia that the drive must accelerate on every index of the cam the 15 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 6,000 r/min The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 12.6 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 35 mm outer ring. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 35 mm track diameter and 12.6 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 15 mm seat, and in packaging machine timing mechanisms the 99 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 19 mm width and the published 14.9 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the PWTR15-2RS-XL?", "a": "The PWTR15-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 35 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×35×19 mm. Mass is 99 g." }, { "q": "What does the PWTR15-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR15-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×35×19 mm and the catalogue ratings are C 12.6 kN, C0 14.9 kN, Cur 1.79 kN." }, { "q": "What is the load capacity of the PWTR15-2RS-XL?", "a": "The basic dynamic load rating C is 12.6 kN and the basic static load rating C0 is 14.9 kN; the fatigue load limit Cur is 1.79 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR15-2RS-XL?", "a": "HR1 lists a limiting speed of 6,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR15-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 35 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR15", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR15-2RS-XL", "PWTR15-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR17", "brand": "FAG", "manufacturer_designation": "NUTR17", "series": "nutr-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 18.8, "static_load_kN": 25.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×21 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 18.8 kN and C0 25.5 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.74 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.25 kN at 17 mm bore, equivalent to 1.11 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.90 kN per millimetre of rolling-element complement mass is 147 g, or 0.17 g per mm² of the 40×21 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 17 mm pin bore the 21 mm width and 18.8 kN C rating suit high-cycle industrial machinery rather than instrument duty No thermal reference speed is published — the 5,500 r/min limiting speed is the design ceiling, set by roller and seal kinematics Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 40 mm track diameter and 18.8 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 17 mm seat, and in automotive welding jig rollers the 147 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 21 mm width and the published 25.5 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 40 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NUTR17?", "a": "The NUTR17 is a NUTR double-row full-complement yoke-type track roller with 40 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×40×21 mm. Mass is 147 g." }, { "q": "What does the NUTR17 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR17 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×40×21 mm and the catalogue ratings are C 18.8 kN, C0 25.5 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the NUTR17?", "a": "The basic dynamic load rating C is 18.8 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 3.25 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR17?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR17?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR17", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR17", "NUTR17" ], "locale_variants": {} }, { "sku": "PWTR17-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR17-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 17, "D_mm": 40, "B_mm": 21, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 14.3, "static_load_kN": 18.2, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 147, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×40×21 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 14.3 kN and C0 18.2 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.79 reflects a rolling-element pack sized for heavy static track loading, and the 11.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.2 kN at 17 mm bore, equivalent to 0.84 kN of dynamic rating per millimetre — the limiting speed is 5,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.68 kN per millimetre of rolling-element complement mass is 147 g, or 0.17 g per mm² of the 40×21 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 17 mm pin bore the 21 mm width and 14.3 kN C rating suit high-cycle industrial machinery rather than instrument duty PWTR is the sealed double-row full-complement yoke roller: two cylindrical roller rows, 2RS contact seals both sides and the profiled (crowned) running surface on the 40 mm outer ring The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 5,000 r/min limit. The sealed 2RS execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 40 mm track diameter and 14.3 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 17 mm seat, and in automatic assembly machine carriages the 147 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 21 mm width and the published 18.2 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the PWTR17-2RS-XL?", "a": "The PWTR17-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 40 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×40×21 mm. Mass is 147 g." }, { "q": "What does the PWTR17-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR17-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×40×21 mm and the catalogue ratings are C 14.3 kN, C0 18.2 kN, Cur 2.2 kN." }, { "q": "What is the load capacity of the PWTR17-2RS-XL?", "a": "The basic dynamic load rating C is 14.3 kN and the basic static load rating C0 is 18.2 kN; the fatigue load limit Cur is 2.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR17-2RS-XL?", "a": "HR1 lists a limiting speed of 5,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR17-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 40 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR17", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR17-2RS-XL", "PWTR17-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR1542", "brand": "FAG", "manufacturer_designation": "NUTR1542", "series": "nutr-series", "type": "support_roller", "d_mm": 15, "D_mm": 42, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 18.3, "static_load_kN": 24.7, "fatigue_load_limit_kN": 3.15, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 158, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×42×19 mm: the 42 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 18.3 kN and C0 24.7 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.74 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.15 kN at 15 mm bore, equivalent to 1.22 kN of dynamic rating per millimetre — the limiting speed is 6,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.96 kN per millimetre of rolling-element complement mass is 158 g, or 0.20 g per mm² of the 42×19 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 15 mm pin bore the 19 mm width and 18.3 kN C rating suit high-cycle industrial machinery rather than instrument duty NUTR is the double-row full-complement yoke roller: two cylindrical roller rows give the highest radial capacity in the 42 mm track-roller envelope, open and relubricatable At 158 g the double-row roller has substantial inertia; the cam drive must accelerate that mass, and a misaligned track concentrates load onto one row Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 42 mm track diameter and 18.3 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 15 mm seat, and in woodworking machine feed tracks the 158 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 19 mm width and the published 24.7 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the NUTR1542?", "a": "The NUTR1542 is a NUTR double-row full-complement yoke-type track roller with 42 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×42×19 mm. Mass is 158 g." }, { "q": "What does the NUTR1542 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR1542 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 15×42×19 mm and the catalogue ratings are C 18.3 kN, C0 24.7 kN, Cur 3.15 kN." }, { "q": "What is the load capacity of the NUTR1542?", "a": "The basic dynamic load rating C is 18.3 kN and the basic static load rating C0 is 24.7 kN; the fatigue load limit Cur is 3.15 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR1542?", "a": "HR1 lists a limiting speed of 6,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR1542?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 42 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR1542", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR1542", "NUTR1542" ], "locale_variants": {} }, { "sku": "PWTR1542-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR1542-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 15, "D_mm": 42, "B_mm": 19, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 14.7, "static_load_kN": 16.2, "fatigue_load_limit_kN": 2.18, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 158, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 15×42×19 mm: the 42 mm outside diameter is the track-running surface — a thick-walled outer ring over a 15 mm bore — and the 19 mm width sets the contact width on the mating track the catalogue lists C 14.7 kN and C0 16.2 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.91 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.18 kN at 15 mm bore, equivalent to 0.98 kN of dynamic rating per millimetre — the limiting speed is 6,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 15 mm bore takes the mounting pin or shaft; across the 19 mm contact width the dynamic rating works out to 0.77 kN per millimetre of rolling-element complement mass is 158 g, or 0.20 g per mm² of the 42×19 mm track envelope — inertia that the drive must accelerate on every index of the cam the 15 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The 15 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 16.2 kN static rating Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 6,000 r/min X-life status (-XL) indicates the current Schaeffler premium execution at 15 mm bore; the 16.2 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 15 mm-bore unit greased for life. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 42 mm track diameter and 14.7 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 15 mm seat, and in robotic arm linear axes the 158 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 19 mm width and the published 16.2 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the PWTR1542-2RS-XL?", "a": "The PWTR1542-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 42 mm outside diameter, 15 mm bore and 19 mm width, envelope 15×42×19 mm. Mass is 158 g." }, { "q": "What does the PWTR1542-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR1542-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 15×42×19 mm and the catalogue ratings are C 14.7 kN, C0 16.2 kN, Cur 2.18 kN." }, { "q": "What is the load capacity of the PWTR1542-2RS-XL?", "a": "The basic dynamic load rating C is 14.7 kN and the basic static load rating C0 is 16.2 kN; the fatigue load limit Cur is 2.18 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR1542-2RS-XL?", "a": "HR1 lists a limiting speed of 6,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR1542-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 42 mm outer surface tolerates only small angular error. The inner ring lets the 15 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR1542", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR1542-2RS-XL", "PWTR1542-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR1747", "brand": "FAG", "manufacturer_designation": "NUTR1747", "series": "nutr-series", "type": "support_roller", "d_mm": 17, "D_mm": 47, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 21.6, "static_load_kN": 31, "fatigue_load_limit_kN": 3.9, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 220, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×47×21 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 21.6 kN and C0 31 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.70 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.9 kN at 17 mm bore, equivalent to 1.27 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 1.03 kN per millimetre of rolling-element complement mass is 220 g, or 0.22 g per mm² of the 47×21 mm track envelope — inertia that the drive must accelerate on every index of the cam at 17 mm pin bore this size balances the 47 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 17 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 31 kN static rating No thermal reference speed is published — the 5,500 r/min limiting speed is the design ceiling, set by roller and seal kinematics Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 47 mm track diameter and 21.6 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 17 mm seat, and in linear rail and profile track guidance the 220 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 21 mm width and the published 31 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the NUTR1747?", "a": "The NUTR1747 is a NUTR double-row full-complement yoke-type track roller with 47 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×47×21 mm. Mass is 220 g." }, { "q": "What does the NUTR1747 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR1747 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 17×47×21 mm and the catalogue ratings are C 21.6 kN, C0 31 kN, Cur 3.9 kN." }, { "q": "What is the load capacity of the NUTR1747?", "a": "The basic dynamic load rating C is 21.6 kN and the basic static load rating C0 is 31 kN; the fatigue load limit Cur is 3.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR1747?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR1747?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR1747", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR1747", "NUTR1747" ], "locale_variants": {} }, { "sku": "PWTR1747-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR1747-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 17, "D_mm": 47, "B_mm": 21, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 15.9, "static_load_kN": 18.4, "fatigue_load_limit_kN": 2.48, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 220, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 17×47×21 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 17 mm bore — and the 21 mm width sets the contact width on the mating track the catalogue lists C 15.9 kN and C0 18.4 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.86 reflects a rolling-element pack sized for heavy static track loading, and the 15.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.48 kN at 17 mm bore, equivalent to 0.94 kN of dynamic rating per millimetre — the limiting speed is 5,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 17 mm bore takes the mounting pin or shaft; across the 21 mm contact width the dynamic rating works out to 0.76 kN per millimetre of rolling-element complement mass is 220 g, or 0.22 g per mm² of the 47×21 mm track envelope — inertia that the drive must accelerate on every index of the cam the 17 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The 17 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 18.4 kN static rating Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 5,000 r/min -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 15.9 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 47 mm outer ring. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 47 mm track diameter and 15.9 kN dynamic rating match the duty. In robotic arm linear axes the unit fits a compact 17 mm seat, and in agricultural and textile cam followers the 220 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 21 mm width and the published 18.4 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the PWTR1747-2RS-XL?", "a": "The PWTR1747-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 47 mm outside diameter, 17 mm bore and 21 mm width, envelope 17×47×21 mm. Mass is 220 g." }, { "q": "What does the PWTR1747-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR1747-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 17×47×21 mm and the catalogue ratings are C 15.9 kN, C0 18.4 kN, Cur 2.48 kN." }, { "q": "What is the load capacity of the PWTR1747-2RS-XL?", "a": "The basic dynamic load rating C is 15.9 kN and the basic static load rating C0 is 18.4 kN; the fatigue load limit Cur is 2.48 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR1747-2RS-XL?", "a": "HR1 lists a limiting speed of 5,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR1747-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 17 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR1747", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR1747-2RS-XL", "PWTR1747-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR20", "brand": "FAG", "manufacturer_designation": "NUTR20", "series": "nutr-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 28.5, "static_load_kN": 38, "fatigue_load_limit_kN": 4.95, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 245, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×25 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 28.5 kN and C0 38 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.75 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.95 kN at 20 mm bore, equivalent to 1.43 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 1.14 kN per millimetre of rolling-element complement mass is 245 g, or 0.21 g per mm² of the 47×25 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 20 mm pin bore the 25 mm width and 28.5 kN C rating suit high-cycle industrial machinery rather than instrument duty NUTR is the double-row full-complement yoke roller: two cylindrical roller rows give the highest radial capacity in the 47 mm track-roller envelope, open and relubricatable Two roller rows across the 25 mm width provide C 28.5 kN and C0 38 kN, with the thick outer ring profiled to tolerate track misalignment Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 47 mm track diameter and 28.5 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 20 mm seat, and in automatic assembly machine carriages the 245 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 25 mm width and the published 38 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 47 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NUTR20?", "a": "The NUTR20 is a NUTR double-row full-complement yoke-type track roller with 47 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×47×25 mm. Mass is 245 g." }, { "q": "What does the NUTR20 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR20 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×25 mm and the catalogue ratings are C 28.5 kN, C0 38 kN, Cur 4.95 kN." }, { "q": "What is the load capacity of the NUTR20?", "a": "The basic dynamic load rating C is 28.5 kN and the basic static load rating C0 is 38 kN; the fatigue load limit Cur is 4.95 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR20?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR20?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR20", "NUTR20" ], "locale_variants": {} }, { "sku": "PWTR20-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR20-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 24.6, "static_load_kN": 31, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 245, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×25 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 24.6 kN and C0 31 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.79 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.8 kN at 20 mm bore, equivalent to 1.23 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 0.98 kN per millimetre of rolling-element complement mass is 245 g, or 0.21 g per mm² of the 47×25 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 20 mm pin bore the 25 mm width and 24.6 kN C rating suit high-cycle industrial machinery rather than instrument duty The 20 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 31 kN static rating As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 3.8 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 3,800 r/min. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 47 mm track diameter and 24.6 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 20 mm seat, and in robotic arm linear axes the 245 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 25 mm width and the published 31 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the PWTR20-2RS-XL?", "a": "The PWTR20-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 47 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×47×25 mm. Mass is 245 g." }, { "q": "What does the PWTR20-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR20-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×47×25 mm and the catalogue ratings are C 24.6 kN, C0 31 kN, Cur 3.8 kN." }, { "q": "What is the load capacity of the PWTR20-2RS-XL?", "a": "The basic dynamic load rating C is 24.6 kN and the basic static load rating C0 is 31 kN; the fatigue load limit Cur is 3.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR20-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR20-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 47 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR20", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR20-2RS-XL", "PWTR20-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR2052", "brand": "FAG", "manufacturer_designation": "NUTR2052", "series": "nutr-series", "type": "support_roller", "d_mm": 20, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 31.5, "static_load_kN": 44.5, "fatigue_load_limit_kN": 5.8, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 321, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 31.5 kN and C0 44.5 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.8 kN at 20 mm bore, equivalent to 1.57 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 1.26 kN per millimetre of rolling-element complement mass is 321 g, or 0.25 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The open form is relubricated via the inner ring; follow the interval strictly because the packed roller rows trap contaminants Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 4,200 r/min Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 52 mm track diameter and 31.5 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 20 mm seat, and in robotic arm linear axes the 321 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 25 mm width and the published 44.5 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the NUTR2052?", "a": "The NUTR2052 is a NUTR double-row full-complement yoke-type track roller with 52 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×52×25 mm. Mass is 321 g." }, { "q": "What does the NUTR2052 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR2052 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×52×25 mm and the catalogue ratings are C 31.5 kN, C0 44.5 kN, Cur 5.8 kN." }, { "q": "What is the load capacity of the NUTR2052?", "a": "The basic dynamic load rating C is 31.5 kN and the basic static load rating C0 is 44.5 kN; the fatigue load limit Cur is 5.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR2052?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR2052?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR2052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR2052", "NUTR2052" ], "locale_variants": {} }, { "sku": "PWTR2052-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR2052-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 20, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 27, "static_load_kN": 35.5, "fatigue_load_limit_kN": 4.35, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 321, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 27 kN and C0 35.5 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.35 kN at 20 mm bore, equivalent to 1.35 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 1.08 kN per millimetre of rolling-element complement mass is 321 g, or 0.25 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm pin bore this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication No thermal reference speed is published — the 3,800 r/min limiting speed is the design ceiling, set by roller and seal kinematics -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 27 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 52 mm outer ring. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 52 mm track diameter and 27 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 20 mm seat, and in packaging machine timing mechanisms the 321 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 25 mm width and the published 35.5 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the PWTR2052-2RS-XL?", "a": "The PWTR2052-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 52 mm outside diameter, 20 mm bore and 25 mm width, envelope 20×52×25 mm. Mass is 321 g." }, { "q": "What does the PWTR2052-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR2052-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×52×25 mm and the catalogue ratings are C 27 kN, C0 35.5 kN, Cur 4.35 kN." }, { "q": "What is the load capacity of the PWTR2052-2RS-XL?", "a": "The basic dynamic load rating C is 27 kN and the basic static load rating C0 is 35.5 kN; the fatigue load limit Cur is 4.35 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR2052-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR2052-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 20 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR2052", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR2052-2RS-XL", "PWTR2052-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR25", "brand": "FAG", "manufacturer_designation": "NUTR25", "series": "nutr-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 29.5, "static_load_kN": 41.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 281, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 29.5 kN and C0 41.5 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.4 kN at 25 mm bore, equivalent to 1.18 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 1.18 kN per millimetre of rolling-element complement mass is 281 g, or 0.22 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam at 25 mm pin bore this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Two roller rows across the 25 mm width provide C 29.5 kN and C0 41.5 kN, with the thick outer ring profiled to tolerate track misalignment Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 4,200 r/min Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 52 mm track diameter and 29.5 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 25 mm seat, and in packaging machine timing mechanisms the 281 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 25 mm width and the published 41.5 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NUTR25?", "a": "The NUTR25 is a NUTR double-row full-complement yoke-type track roller with 52 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×52×25 mm. Mass is 281 g." }, { "q": "What does the NUTR25 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR25 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×52×25 mm and the catalogue ratings are C 29.5 kN, C0 41.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NUTR25?", "a": "The basic dynamic load rating C is 29.5 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 5.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR25?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR25?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR25", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR25", "NUTR25" ], "locale_variants": {} }, { "sku": "PWTR25-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR25-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 25, "D_mm": 52, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 25.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 281, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×52×25 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 25.5 kN and C0 33.5 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.2 kN at 25 mm bore, equivalent to 1.02 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 1.02 kN per millimetre of rolling-element complement mass is 281 g, or 0.22 g per mm² of the 52×25 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 25 mm pin bore the 25 mm width and 25.5 kN C rating suit high-cycle industrial machinery rather than instrument duty The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication No thermal reference speed is published — the 3,800 r/min limiting speed is the design ceiling, set by roller and seal kinematics As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 4.2 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 3,800 r/min. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 52 mm track diameter and 25.5 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 25 mm seat, and in conveyor transfer and diverting stations the 281 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 25 mm width and the published 33.5 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 52 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the PWTR25-2RS-XL?", "a": "The PWTR25-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 52 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×52×25 mm. Mass is 281 g." }, { "q": "What does the PWTR25-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR25-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×52×25 mm and the catalogue ratings are C 25.5 kN, C0 33.5 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the PWTR25-2RS-XL?", "a": "The basic dynamic load rating C is 25.5 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 4.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR25-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR25-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 52 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR25", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR25-2RS-XL", "PWTR25-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR2562", "brand": "FAG", "manufacturer_designation": "NUTR2562", "series": "nutr-series", "type": "support_roller", "d_mm": 25, "D_mm": 62, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 35.5, "static_load_kN": 54, "fatigue_load_limit_kN": 7, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×62×25 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 35.5 kN and C0 54 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.66 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7 kN at 25 mm bore, equivalent to 1.42 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 1.42 kN per millimetre of rolling-element complement mass is 450 g, or 0.29 g per mm² of the 62×25 mm track envelope — inertia that the drive must accelerate on every index of the cam at 25 mm pin bore this size balances the 62 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Two roller rows across the 25 mm width provide C 35.5 kN and C0 54 kN, with the thick outer ring profiled to tolerate track misalignment The open form is relubricated via the inner ring; follow the interval strictly because the packed roller rows trap contaminants Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 62 mm track diameter and 35.5 kN dynamic rating match the duty. In robotic arm linear axes the unit fits a compact 25 mm seat, and in agricultural and textile cam followers the 450 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 25 mm width and the published 54 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 62 mm outer ring does.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 62 mm outer ring does.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NUTR2562?", "a": "The NUTR2562 is a NUTR double-row full-complement yoke-type track roller with 62 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×62×25 mm. Mass is 450 g." }, { "q": "What does the NUTR2562 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR2562 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 25×62×25 mm and the catalogue ratings are C 35.5 kN, C0 54 kN, Cur 7 kN." }, { "q": "What is the load capacity of the NUTR2562?", "a": "The basic dynamic load rating C is 35.5 kN and the basic static load rating C0 is 54 kN; the fatigue load limit Cur is 7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR2562?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR2562?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR2562", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR2562", "NUTR2562" ], "locale_variants": {} }, { "sku": "PWTR2562-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR2562-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 25, "D_mm": 62, "B_mm": 25, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 30, "static_load_kN": 42.5, "fatigue_load_limit_kN": 5.3, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 25×62×25 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 25 mm bore — and the 25 mm width sets the contact width on the mating track the catalogue lists C 30 kN and C0 42.5 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.3 kN at 25 mm bore, equivalent to 1.20 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 25 mm bore takes the mounting pin or shaft; across the 25 mm contact width the dynamic rating works out to 1.20 kN per millimetre of rolling-element complement mass is 450 g, or 0.29 g per mm² of the 62×25 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 25 mm pin bore the 25 mm width and 30 kN C rating suit high-cycle industrial machinery rather than instrument duty The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication The 25 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 42.5 kN static rating The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,800 r/min limit. The sealed 2RS execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 62 mm track diameter and 30 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 25 mm seat, and in linear rail and profile track guidance the 450 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 25 mm width and the published 42.5 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the PWTR2562-2RS-XL?", "a": "The PWTR2562-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 62 mm outside diameter, 25 mm bore and 25 mm width, envelope 25×62×25 mm. Mass is 450 g." }, { "q": "What does the PWTR2562-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR2562-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 25×62×25 mm and the catalogue ratings are C 30 kN, C0 42.5 kN, Cur 5.3 kN." }, { "q": "What is the load capacity of the PWTR2562-2RS-XL?", "a": "The basic dynamic load rating C is 30 kN and the basic static load rating C0 is 42.5 kN; the fatigue load limit Cur is 5.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR2562-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR2562-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 25 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR2562", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR2562-2RS-XL", "PWTR2562-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR30", "brand": "FAG", "manufacturer_designation": "NUTR30", "series": "nutr-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 40.5, "static_load_kN": 55, "fatigue_load_limit_kN": 7.4, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 465, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×29 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 40.5 kN and C0 55 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.74 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.4 kN at 30 mm bore, equivalent to 1.35 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.40 kN per millimetre of rolling-element complement mass is 465 g, or 0.26 g per mm² of the 62×29 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Two roller rows across the 29 mm width provide C 40.5 kN and C0 55 kN, with the thick outer ring profiled to tolerate track misalignment Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 2,600 r/min Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 62 mm track diameter and 40.5 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 30 mm seat, and in woodworking machine feed tracks the 465 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 29 mm width and the published 55 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 62 mm outer ring does.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 62 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NUTR30?", "a": "The NUTR30 is a NUTR double-row full-complement yoke-type track roller with 62 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×62×29 mm. Mass is 465 g." }, { "q": "What does the NUTR30 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR30 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×62×29 mm and the catalogue ratings are C 40.5 kN, C0 55 kN, Cur 7.4 kN." }, { "q": "What is the load capacity of the NUTR30?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 7.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR30?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR30?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR30", "NUTR30" ], "locale_variants": {} }, { "sku": "PWTR30-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR30-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 30, "D_mm": 62, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 35, "static_load_kN": 46, "fatigue_load_limit_kN": 5.9, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 465, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×62×29 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 35 kN and C0 46 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.9 kN at 30 mm bore, equivalent to 1.17 kN of dynamic rating per millimetre — the limiting speed is 2,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.21 kN per millimetre of rolling-element complement mass is 465 g, or 0.26 g per mm² of the 62×29 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty PWTR is the sealed double-row full-complement yoke roller: two cylindrical roller rows, 2RS contact seals both sides and the profiled (crowned) running surface on the 62 mm outer ring At 465 g the double-row roller has substantial inertia; the cam drive must accelerate that mass, and a misaligned track concentrates load onto one row As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 5.9 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 2,200 r/min. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 62 mm track diameter and 35 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 30 mm seat, and in printing press sheet-transfer grippers the 465 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 29 mm width and the published 46 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the PWTR30-2RS-XL?", "a": "The PWTR30-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 62 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×62×29 mm. Mass is 465 g." }, { "q": "What does the PWTR30-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR30-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×62×29 mm and the catalogue ratings are C 35 kN, C0 46 kN, Cur 5.9 kN." }, { "q": "What is the load capacity of the PWTR30-2RS-XL?", "a": "The basic dynamic load rating C is 35 kN and the basic static load rating C0 is 46 kN; the fatigue load limit Cur is 5.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR30-2RS-XL?", "a": "HR1 lists a limiting speed of 2,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR30-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 62 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR30", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1453", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR30-2RS-XL", "PWTR30-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR3072", "brand": "FAG", "manufacturer_designation": "NUTR3072", "series": "nutr-series", "type": "support_roller", "d_mm": 30, "D_mm": 72, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 48, "static_load_kN": 71, "fatigue_load_limit_kN": 9.3, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 697, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×72×29 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 48 kN and C0 71 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 21.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 9.3 kN at 30 mm bore, equivalent to 1.60 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.66 kN per millimetre of rolling-element complement mass is 697 g, or 0.33 g per mm² of the 72×29 mm track envelope — inertia that the drive must accelerate on every index of the cam at 30 mm pin bore this size balances the 72 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range No thermal reference speed is published — the 2,600 r/min limiting speed is the design ceiling, set by roller and seal kinematics Two roller rows across the 29 mm width provide C 48 kN and C0 71 kN, with the thick outer ring profiled to tolerate track misalignment Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 72 mm track diameter and 48 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 30 mm seat, and in conveyor transfer and diverting stations the 697 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 29 mm width and the published 71 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 72 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NUTR3072?", "a": "The NUTR3072 is a NUTR double-row full-complement yoke-type track roller with 72 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×72×29 mm. Mass is 697 g." }, { "q": "What does the NUTR3072 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR3072 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×72×29 mm and the catalogue ratings are C 48 kN, C0 71 kN, Cur 9.3 kN." }, { "q": "What is the load capacity of the NUTR3072?", "a": "The basic dynamic load rating C is 48 kN and the basic static load rating C0 is 71 kN; the fatigue load limit Cur is 9.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR3072?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR3072?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR3072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR3072", "NUTR3072" ], "locale_variants": {} }, { "sku": "PWTR3072-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR3072-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 30, "D_mm": 72, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 41, "static_load_kN": 56, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 697, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×72×29 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 41 kN and C0 56 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 21.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.3 kN at 30 mm bore, equivalent to 1.37 kN of dynamic rating per millimetre — the limiting speed is 2,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.41 kN per millimetre of rolling-element complement mass is 697 g, or 0.33 g per mm² of the 72×29 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm pin bore falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 2,200 r/min PWTR is the sealed double-row full-complement yoke roller: two cylindrical roller rows, 2RS contact seals both sides and the profiled (crowned) running surface on the 72 mm outer ring -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 41 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 72 mm outer ring. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 72 mm track diameter and 41 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 30 mm seat, and in printing press sheet-transfer grippers the 697 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 29 mm width and the published 56 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 72 mm outer ring does. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 72 mm outer ring does.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the PWTR3072-2RS-XL?", "a": "The PWTR3072-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 72 mm outside diameter, 30 mm bore and 29 mm width, envelope 30×72×29 mm. Mass is 697 g." }, { "q": "What does the PWTR3072-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR3072-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×72×29 mm and the catalogue ratings are C 41 kN, C0 56 kN, Cur 7.3 kN." }, { "q": "What is the load capacity of the PWTR3072-2RS-XL?", "a": "The basic dynamic load rating C is 41 kN and the basic static load rating C0 is 56 kN; the fatigue load limit Cur is 7.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR3072-2RS-XL?", "a": "HR1 lists a limiting speed of 2,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR3072-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 30 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR3072", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR3072-2RS-XL", "PWTR3072-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR35", "brand": "FAG", "manufacturer_designation": "NUTR35", "series": "nutr-series", "type": "support_roller", "d_mm": 35, "D_mm": 72, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45, "static_load_kN": 66, "fatigue_load_limit_kN": 8.9, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×72×29 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 45 kN and C0 66 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.9 kN at 35 mm bore, equivalent to 1.29 kN of dynamic rating per millimetre — the limiting speed is 2,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.55 kN per millimetre of rolling-element complement mass is 630 g, or 0.30 g per mm² of the 72×29 mm track envelope — inertia that the drive must accelerate on every index of the cam at 35 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 29 mm width as a standard mounting space No thermal reference speed is published — the 2,100 r/min limiting speed is the design ceiling, set by roller and seal kinematics Two roller rows across the 29 mm width provide C 45 kN and C0 66 kN, with the thick outer ring profiled to tolerate track misalignment Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 72 mm track diameter and 45 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 35 mm seat, and in automotive welding jig rollers the 630 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 29 mm width and the published 66 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 72 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NUTR35?", "a": "The NUTR35 is a NUTR double-row full-complement yoke-type track roller with 72 mm outside diameter, 35 mm bore and 29 mm width, envelope 35×72×29 mm. Mass is 630 g." }, { "q": "What does the NUTR35 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR35 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 35×72×29 mm and the catalogue ratings are C 45 kN, C0 66 kN, Cur 8.9 kN." }, { "q": "What is the load capacity of the NUTR35?", "a": "The basic dynamic load rating C is 45 kN and the basic static load rating C0 is 66 kN; the fatigue load limit Cur is 8.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR35?", "a": "HR1 lists a limiting speed of 2,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR35?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR35", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR35", "NUTR35" ], "locale_variants": {} }, { "sku": "PWTR35-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR35-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 35, "D_mm": 72, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 39, "static_load_kN": 55, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 630, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×72×29 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 39 kN and C0 55 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 18.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.1 kN at 35 mm bore, equivalent to 1.11 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.34 kN per millimetre of rolling-element complement mass is 630 g, or 0.30 g per mm² of the 72×29 mm track envelope — inertia that the drive must accelerate on every index of the cam the 35 mm pin bore places this bearing in the medium band, where the 72 mm envelope already carries ratings in the tens of kilonewtons At 630 g the double-row roller has substantial inertia; the cam drive must accelerate that mass, and a misaligned track concentrates load onto one row As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 7.1 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 1,800 r/min. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 72 mm track diameter and 39 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 35 mm seat, and in cam drives and indexing tables the 630 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 29 mm width and the published 55 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the PWTR35-2RS-XL?", "a": "The PWTR35-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 72 mm outside diameter, 35 mm bore and 29 mm width, envelope 35×72×29 mm. Mass is 630 g." }, { "q": "What does the PWTR35-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR35-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×72×29 mm and the catalogue ratings are C 39 kN, C0 55 kN, Cur 7.1 kN." }, { "q": "What is the load capacity of the PWTR35-2RS-XL?", "a": "The basic dynamic load rating C is 39 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 7.1 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR35-2RS-XL?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR35-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 72 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR35", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR35-2RS-XL", "PWTR35-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR3580", "brand": "FAG", "manufacturer_designation": "NUTR3580", "series": "nutr-series", "type": "support_roller", "d_mm": 35, "D_mm": 80, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 51, "static_load_kN": 79, "fatigue_load_limit_kN": 10.5, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 836, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×80×29 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 51 kN and C0 79 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.65 reflects a rolling-element pack sized for heavy static track loading, and the 22.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 10.5 kN at 35 mm bore, equivalent to 1.46 kN of dynamic rating per millimetre — the limiting speed is 2,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.76 kN per millimetre of rolling-element complement mass is 836 g, or 0.36 g per mm² of the 80×29 mm track envelope — inertia that the drive must accelerate on every index of the cam the 35 mm pin bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 2,100 r/min The open form is relubricated via the inner ring; follow the interval strictly because the packed roller rows trap contaminants Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 80 mm track diameter and 51 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 35 mm seat, and in automotive welding jig rollers the 836 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 29 mm width and the published 79 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NUTR3580?", "a": "The NUTR3580 is a NUTR double-row full-complement yoke-type track roller with 80 mm outside diameter, 35 mm bore and 29 mm width, envelope 35×80×29 mm. Mass is 836 g." }, { "q": "What does the NUTR3580 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR3580 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 35×80×29 mm and the catalogue ratings are C 51 kN, C0 79 kN, Cur 10.5 kN." }, { "q": "What is the load capacity of the NUTR3580?", "a": "The basic dynamic load rating C is 51 kN and the basic static load rating C0 is 79 kN; the fatigue load limit Cur is 10.5 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR3580?", "a": "HR1 lists a limiting speed of 2,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR3580?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR3580", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR3580", "NUTR3580" ], "locale_variants": {} }, { "sku": "PWTR3580-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR3580-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 35, "D_mm": 80, "B_mm": 29, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 43.5, "static_load_kN": 65, "fatigue_load_limit_kN": 8.3, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 836, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 35×80×29 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 35 mm bore — and the 29 mm width sets the contact width on the mating track the catalogue lists C 43.5 kN and C0 65 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 22.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.3 kN at 35 mm bore, equivalent to 1.24 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 35 mm bore takes the mounting pin or shaft; across the 29 mm contact width the dynamic rating works out to 1.50 kN per millimetre of rolling-element complement mass is 836 g, or 0.36 g per mm² of the 80×29 mm track envelope — inertia that the drive must accelerate on every index of the cam at 35 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 29 mm width as a standard mounting space The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication At 836 g the double-row roller has substantial inertia; the cam drive must accelerate that mass, and a misaligned track concentrates load onto one row -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 43.5 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 80 mm outer ring. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 80 mm track diameter and 43.5 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 35 mm seat, and in printing press sheet-transfer grippers the 836 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 29 mm width and the published 65 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the PWTR3580-2RS-XL?", "a": "The PWTR3580-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 80 mm outside diameter, 35 mm bore and 29 mm width, envelope 35×80×29 mm. Mass is 836 g." }, { "q": "What does the PWTR3580-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR3580-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 35×80×29 mm and the catalogue ratings are C 43.5 kN, C0 65 kN, Cur 8.3 kN." }, { "q": "What is the load capacity of the PWTR3580-2RS-XL?", "a": "The basic dynamic load rating C is 43.5 kN and the basic static load rating C0 is 65 kN; the fatigue load limit Cur is 8.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR3580-2RS-XL?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR3580-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 35 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR3580", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR3580-2RS-XL", "PWTR3580-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR40", "brand": "FAG", "manufacturer_designation": "NUTR40", "series": "nutr-series", "type": "support_roller", "d_mm": 40, "D_mm": 80, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 56, "static_load_kN": 81, "fatigue_load_limit_kN": 11.3, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×80×32 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 56 kN and C0 81 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.69 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.3 kN at 40 mm bore, equivalent to 1.40 kN of dynamic rating per millimetre — the limiting speed is 1,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.75 kN per millimetre of rolling-element complement mass is 816 g, or 0.32 g per mm² of the 80×32 mm track envelope — inertia that the drive must accelerate on every index of the cam the 40 mm pin bore places this bearing in the medium band, where the 80 mm envelope already carries ratings in the tens of kilonewtons The open form is relubricated via the inner ring; follow the interval strictly because the packed roller rows trap contaminants NUTR is the double-row full-complement yoke roller: two cylindrical roller rows give the highest radial capacity in the 80 mm track-roller envelope, open and relubricatable Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 80 mm track diameter and 56 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 40 mm seat, and in conveyor transfer and diverting stations the 816 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 32 mm width and the published 81 kN static rating. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips." ], "faq": [ { "q": "What are the dimensions of the NUTR40?", "a": "The NUTR40 is a NUTR double-row full-complement yoke-type track roller with 80 mm outside diameter, 40 mm bore and 32 mm width, envelope 40×80×32 mm. Mass is 816 g." }, { "q": "What does the NUTR40 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR40 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 40×80×32 mm and the catalogue ratings are C 56 kN, C0 81 kN, Cur 11.3 kN." }, { "q": "What is the load capacity of the NUTR40?", "a": "The basic dynamic load rating C is 56 kN and the basic static load rating C0 is 81 kN; the fatigue load limit Cur is 11.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR40?", "a": "HR1 lists a limiting speed of 1,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR40?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR40", "NUTR40" ], "locale_variants": {} }, { "sku": "PWTR40-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR40-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 40, "D_mm": 80, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45, "static_load_kN": 62, "fatigue_load_limit_kN": 8, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 816, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×80×32 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 45 kN and C0 62 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8 kN at 40 mm bore, equivalent to 1.13 kN of dynamic rating per millimetre — the limiting speed is 1,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.41 kN per millimetre of rolling-element complement mass is 816 g, or 0.32 g per mm² of the 80×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 40 mm pin bore marks the medium range: mounting forces and fits become critical, and the 816 g mass calls for proper induction or press tooling rather than hand fitting Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 1,500 r/min The 40 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 62 kN static rating X-life status (-XL) indicates the current Schaeffler premium execution at 40 mm bore; the 62 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 40 mm-bore unit greased for life. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 80 mm track diameter and 45 kN dynamic rating match the duty. In agricultural and textile cam followers the unit fits a compact 40 mm seat, and in packaging machine timing mechanisms the 816 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 32 mm width and the published 62 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading." ], "faq": [ { "q": "What are the dimensions of the PWTR40-2RS-XL?", "a": "The PWTR40-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 80 mm outside diameter, 40 mm bore and 32 mm width, envelope 40×80×32 mm. Mass is 816 g." }, { "q": "What does the PWTR40-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR40-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×80×32 mm and the catalogue ratings are C 45 kN, C0 62 kN, Cur 8 kN." }, { "q": "What is the load capacity of the PWTR40-2RS-XL?", "a": "The basic dynamic load rating C is 45 kN and the basic static load rating C0 is 62 kN; the fatigue load limit Cur is 8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR40-2RS-XL?", "a": "HR1 lists a limiting speed of 1,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR40-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 80 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR40", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR40-2RS-XL", "PWTR40-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR45", "brand": "FAG", "manufacturer_designation": "NUTR45", "series": "nutr-series", "type": "support_roller", "d_mm": 45, "D_mm": 85, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 56, "static_load_kN": 85, "fatigue_load_limit_kN": 11.7, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 883, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×85×32 mm: the 85 mm outside diameter is the track-running surface — a thick-walled outer ring over a 45 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 56 kN and C0 85 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.66 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.7 kN at 45 mm bore, equivalent to 1.24 kN of dynamic rating per millimetre — the limiting speed is 1,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 45 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.75 kN per millimetre of rolling-element complement mass is 883 g, or 0.32 g per mm² of the 85×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 45 mm pin bore marks the medium range: mounting forces and fits become critical, and the 883 g mass calls for proper induction or press tooling rather than hand fitting NUTR is the double-row full-complement yoke roller: two cylindrical roller rows give the highest radial capacity in the 85 mm track-roller envelope, open and relubricatable The open form is relubricated via the inner ring; follow the interval strictly because the packed roller rows trap contaminants Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 85 mm track diameter and 56 kN dynamic rating match the duty. In woodworking machine feed tracks the unit fits a compact 45 mm seat, and in cam drives and indexing tables the 883 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 32 mm width and the published 85 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 85 mm outer ring does. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 85 mm outer ring does.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the NUTR45?", "a": "The NUTR45 is a NUTR double-row full-complement yoke-type track roller with 85 mm outside diameter, 45 mm bore and 32 mm width, envelope 45×85×32 mm. Mass is 883 g." }, { "q": "What does the NUTR45 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR45 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 45×85×32 mm and the catalogue ratings are C 56 kN, C0 85 kN, Cur 11.7 kN." }, { "q": "What is the load capacity of the NUTR45?", "a": "The basic dynamic load rating C is 56 kN and the basic static load rating C0 is 85 kN; the fatigue load limit Cur is 11.7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR45?", "a": "HR1 lists a limiting speed of 1,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR45?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 85 mm outer surface tolerates only small angular error. The inner ring lets the 45 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR45", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR45", "NUTR45" ], "locale_variants": {} }, { "sku": "PWTR45-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR45-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 45, "D_mm": 85, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45.5, "static_load_kN": 64, "fatigue_load_limit_kN": 8.4, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 883, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×85×32 mm: the 85 mm outside diameter is the track-running surface — a thick-walled outer ring over a 45 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 45.5 kN and C0 64 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.4 kN at 45 mm bore, equivalent to 1.01 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 45 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.42 kN per millimetre of rolling-element complement mass is 883 g, or 0.32 g per mm² of the 85×32 mm track envelope — inertia that the drive must accelerate on every index of the cam at 45 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 32 mm width as a standard mounting space The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication Reading NUTR/PWTR: double-row, no cage, cylindrical rollers rather than needles — the pack is built for shock-dominated heavy track duty at 1,300 r/min As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 8.4 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 1,300 r/min. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 85 mm track diameter and 45.5 kN dynamic rating match the duty. In automatic assembly machine carriages the unit fits a compact 45 mm seat, and in automotive welding jig rollers the 883 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 32 mm width and the published 64 kN static rating. Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Sealed PP/2RSR units are greased for life: never add a grease nipple, and respect the lower limiting speed imposed by the rubbing lips.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam." ], "faq": [ { "q": "What are the dimensions of the PWTR45-2RS-XL?", "a": "The PWTR45-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 85 mm outside diameter, 45 mm bore and 32 mm width, envelope 45×85×32 mm. Mass is 883 g." }, { "q": "What does the PWTR45-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR45-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×85×32 mm and the catalogue ratings are C 45.5 kN, C0 64 kN, Cur 8.4 kN." }, { "q": "What is the load capacity of the PWTR45-2RS-XL?", "a": "The basic dynamic load rating C is 45.5 kN and the basic static load rating C0 is 64 kN; the fatigue load limit Cur is 8.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR45-2RS-XL?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR45-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 85 mm outer surface tolerates only small angular error. The inner ring lets the 45 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR45", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR45-2RS-XL", "PWTR45-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR4090", "brand": "FAG", "manufacturer_designation": "NUTR4090", "series": "nutr-series", "type": "support_roller", "d_mm": 40, "D_mm": 90, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 66, "static_load_kN": 103, "fatigue_load_limit_kN": 14.2, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 1129, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×90×32 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 66 kN and C0 103 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.64 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 14.2 kN at 40 mm bore, equivalent to 1.65 kN of dynamic rating per millimetre — the limiting speed is 1,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 2.06 kN per millimetre of rolling-element complement mass is 1.129 kg (1129 g), or 0.39 g per mm² of the 90×32 mm track envelope — inertia that the drive must accelerate on every index of the cam at 40 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 32 mm width as a standard mounting space No thermal reference speed is published — the 1,600 r/min limiting speed is the design ceiling, set by roller and seal kinematics At 1129 g the double-row roller has substantial inertia; the cam drive must accelerate that mass, and a misaligned track concentrates load onto one row Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 90 mm track diameter and 66 kN dynamic rating match the duty. In printing press sheet-transfer grippers the unit fits a compact 40 mm seat, and in glass and ceramic line conveyors the 1.129 kg mass is part of the rotor inertia calculation. Designers also specify it for cam drives and indexing tables, relying on the 32 mm width and the published 103 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NUTR4090?", "a": "The NUTR4090 is a NUTR double-row full-complement yoke-type track roller with 90 mm outside diameter, 40 mm bore and 32 mm width, envelope 40×90×32 mm. Mass is 1.129 kg." }, { "q": "What does the NUTR4090 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR4090 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 40×90×32 mm and the catalogue ratings are C 66 kN, C0 103 kN, Cur 14.2 kN." }, { "q": "What is the load capacity of the NUTR4090?", "a": "The basic dynamic load rating C is 66 kN and the basic static load rating C0 is 103 kN; the fatigue load limit Cur is 14.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR4090?", "a": "HR1 lists a limiting speed of 1,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR4090?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR4090", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR4090", "NUTR4090" ], "locale_variants": {} }, { "sku": "PWTR4090-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR4090-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 40, "D_mm": 90, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 52, "static_load_kN": 77, "fatigue_load_limit_kN": 9.8, "limiting_speed_rpm": 1500, "max_rpm": 1500, "weight_g": 1129, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 40×90×32 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 40 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 52 kN and C0 77 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 9.8 kN at 40 mm bore, equivalent to 1.30 kN of dynamic rating per millimetre — the limiting speed is 1,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 40 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.63 kN per millimetre of rolling-element complement mass is 1.129 kg (1129 g), or 0.39 g per mm² of the 90×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 40 mm pin bore marks the medium range: mounting forces and fits become critical, and the 1129 g mass calls for proper induction or press tooling rather than hand fitting At 1129 g the double-row roller has substantial inertia; the cam drive must accelerate that mass, and a misaligned track concentrates load onto one row PWTR is the sealed double-row full-complement yoke roller: two cylindrical roller rows, 2RS contact seals both sides and the profiled (crowned) running surface on the 90 mm outer ring X-life status (-XL) indicates the current Schaeffler premium execution at 40 mm bore; the 77 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 40 mm-bore unit greased for life. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 90 mm track diameter and 52 kN dynamic rating match the duty. In packaging machine timing mechanisms the unit fits a compact 40 mm seat, and in woodworking machine feed tracks the 1.129 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural and textile cam followers, relying on the 32 mm width and the published 77 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the PWTR4090-2RS-XL?", "a": "The PWTR4090-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 90 mm outside diameter, 40 mm bore and 32 mm width, envelope 40×90×32 mm. Mass is 1.129 kg." }, { "q": "What does the PWTR4090-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR4090-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 40×90×32 mm and the catalogue ratings are C 52 kN, C0 77 kN, Cur 9.8 kN." }, { "q": "What is the load capacity of the PWTR4090-2RS-XL?", "a": "The basic dynamic load rating C is 52 kN and the basic static load rating C0 is 77 kN; the fatigue load limit Cur is 9.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR4090-2RS-XL?", "a": "HR1 lists a limiting speed of 1,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR4090-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 40 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR4090", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR4090-2RS-XL", "PWTR4090-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR50", "brand": "FAG", "manufacturer_designation": "NUTR50", "series": "nutr-series", "type": "support_roller", "d_mm": 50, "D_mm": 90, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 57, "static_load_kN": 88, "fatigue_load_limit_kN": 12.2, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×90×32 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 57 kN and C0 88 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.65 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 12.2 kN at 50 mm bore, equivalent to 1.14 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.78 kN per millimetre of rolling-element complement mass is 950 g, or 0.33 g per mm² of the 90×32 mm track envelope — inertia that the drive must accelerate on every index of the cam at 50 mm pin bore this is a mainstream industrial size — conveyor drives, winches and medium gearboxes use the 32 mm width as a standard mounting space No thermal reference speed is published — the 1,300 r/min limiting speed is the design ceiling, set by roller and seal kinematics The 50 mm bore takes the pin; yoke design means the machine lugs support the roller on both sides, which is essential given the 88 kN static rating Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 90 mm track diameter and 57 kN dynamic rating match the duty. In cam drives and indexing tables the unit fits a compact 50 mm seat, and in printing press sheet-transfer grippers the 950 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 32 mm width and the published 88 kN static rating. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 90 mm outer ring does.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track." ], "faq": [ { "q": "What are the dimensions of the NUTR50?", "a": "The NUTR50 is a NUTR double-row full-complement yoke-type track roller with 90 mm outside diameter, 50 mm bore and 32 mm width, envelope 50×90×32 mm. Mass is 950 g." }, { "q": "What does the NUTR50 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR50 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 50×90×32 mm and the catalogue ratings are C 57 kN, C0 88 kN, Cur 12.2 kN." }, { "q": "What is the load capacity of the NUTR50?", "a": "The basic dynamic load rating C is 57 kN and the basic static load rating C0 is 88 kN; the fatigue load limit Cur is 12.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR50?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR50?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR50", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR50", "NUTR50" ], "locale_variants": {} }, { "sku": "PWTR50-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR50-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 50, "D_mm": 90, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 46, "static_load_kN": 67, "fatigue_load_limit_kN": 8.7, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×90×32 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 46 kN and C0 67 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.69 reflects a rolling-element pack sized for heavy static track loading, and the 20.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.7 kN at 50 mm bore, equivalent to 0.92 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.44 kN per millimetre of rolling-element complement mass is 950 g, or 0.33 g per mm² of the 90×32 mm track envelope — inertia that the drive must accelerate on every index of the cam the 50 mm pin bore places this bearing in the medium band, where the 90 mm envelope already carries ratings in the tens of kilonewtons At 950 g the double-row roller has substantial inertia; the cam drive must accelerate that mass, and a misaligned track concentrates load onto one row The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication X-life status (-XL) indicates the current Schaeffler premium execution at 50 mm bore; the 67 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 50 mm-bore unit greased for life. Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 90 mm track diameter and 46 kN dynamic rating match the duty. In glass and ceramic line conveyors the unit fits a compact 50 mm seat, and in linear rail and profile track guidance the 950 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 32 mm width and the published 67 kN static rating. Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Flangeless STO/RSTO/RNA22/NA22 rollers need external axial location; circlips or shoulders must control end float or the roller walks off the track.", "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not." ], "faq": [ { "q": "What are the dimensions of the PWTR50-2RS-XL?", "a": "The PWTR50-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 90 mm outside diameter, 50 mm bore and 32 mm width, envelope 50×90×32 mm. Mass is 950 g." }, { "q": "What does the PWTR50-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR50-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×90×32 mm and the catalogue ratings are C 46 kN, C0 67 kN, Cur 8.7 kN." }, { "q": "What is the load capacity of the PWTR50-2RS-XL?", "a": "The basic dynamic load rating C is 46 kN and the basic static load rating C0 is 67 kN; the fatigue load limit Cur is 8.7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR50-2RS-XL?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR50-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 90 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR50", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR50-2RS-XL", "PWTR50-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR45100", "brand": "FAG", "manufacturer_designation": "NUTR45100", "series": "nutr-series", "type": "support_roller", "d_mm": 45, "D_mm": 100, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 72, "static_load_kN": 116, "fatigue_load_limit_kN": 16.1, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 1396, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×100×32 mm: the 100 mm outside diameter is the track-running surface — a thick-walled outer ring over a 45 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 72 kN and C0 116 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.62 reflects a rolling-element pack sized for heavy static track loading, and the 27.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 16.1 kN at 45 mm bore, equivalent to 1.60 kN of dynamic rating per millimetre — the limiting speed is 1,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 45 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 2.25 kN per millimetre of rolling-element complement mass is 1.396 kg (1396 g), or 0.44 g per mm² of the 100×32 mm track envelope — inertia that the drive must accelerate on every index of the cam the 45 mm pin bore places this bearing in the medium band, where the 100 mm envelope already carries ratings in the tens of kilonewtons NUTR is the double-row full-complement yoke roller: two cylindrical roller rows give the highest radial capacity in the 100 mm track-roller envelope, open and relubricatable Two roller rows across the 32 mm width provide C 72 kN and C0 116 kN, with the thick outer ring profiled to tolerate track misalignment Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 100 mm track diameter and 72 kN dynamic rating match the duty. In automotive welding jig rollers the unit fits a compact 45 mm seat, and in conveyor transfer and diverting stations the 1.396 kg mass is part of the rotor inertia calculation. Designers also specify it for automatic assembly machine carriages, relying on the 32 mm width and the published 116 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 100 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the NUTR45100?", "a": "The NUTR45100 is a NUTR double-row full-complement yoke-type track roller with 100 mm outside diameter, 45 mm bore and 32 mm width, envelope 45×100×32 mm. Mass is 1.396 kg." }, { "q": "What does the NUTR45100 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR45100 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 45×100×32 mm and the catalogue ratings are C 72 kN, C0 116 kN, Cur 16.1 kN." }, { "q": "What is the load capacity of the NUTR45100?", "a": "The basic dynamic load rating C is 72 kN and the basic static load rating C0 is 116 kN; the fatigue load limit Cur is 16.1 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR45100?", "a": "HR1 lists a limiting speed of 1,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR45100?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 100 mm outer surface tolerates only small angular error. The inner ring lets the 45 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR45100", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR45100", "NUTR45100" ], "locale_variants": {} }, { "sku": "PWTR45100-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR45100-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 45, "D_mm": 100, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 56, "static_load_kN": 86, "fatigue_load_limit_kN": 11.1, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 1396, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 45×100×32 mm: the 100 mm outside diameter is the track-running surface — a thick-walled outer ring over a 45 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 56 kN and C0 86 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.65 reflects a rolling-element pack sized for heavy static track loading, and the 27.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.1 kN at 45 mm bore, equivalent to 1.24 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 45 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.75 kN per millimetre of rolling-element complement mass is 1.396 kg (1396 g), or 0.44 g per mm² of the 100×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 45 mm pin bore marks the medium range: mounting forces and fits become critical, and the 1396 g mass calls for proper induction or press tooling rather than hand fitting The 2RS seals make the unit greased for life: use it where wash-down, dust or lack of access rules out relubrication No thermal reference speed is published — the 1,300 r/min limiting speed is the design ceiling, set by roller and seal kinematics As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 11.1 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 1,300 r/min. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 100 mm track diameter and 56 kN dynamic rating match the duty. In linear rail and profile track guidance the unit fits a compact 45 mm seat, and in automatic assembly machine carriages the 1.396 kg mass is part of the rotor inertia calculation. Designers also specify it for glass and ceramic line conveyors, relying on the 32 mm width and the published 86 kN static rating. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 100 mm outer ring does." ], "faq": [ { "q": "What are the dimensions of the PWTR45100-2RS-XL?", "a": "The PWTR45100-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 100 mm outside diameter, 45 mm bore and 32 mm width, envelope 45×100×32 mm. Mass is 1.396 kg." }, { "q": "What does the PWTR45100-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR45100-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 45×100×32 mm and the catalogue ratings are C 56 kN, C0 86 kN, Cur 11.1 kN." }, { "q": "What is the load capacity of the PWTR45100-2RS-XL?", "a": "The basic dynamic load rating C is 56 kN and the basic static load rating C0 is 86 kN; the fatigue load limit Cur is 11.1 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR45100-2RS-XL?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR45100-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 100 mm outer surface tolerates only small angular error. The inner ring lets the 45 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR45100", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR45100-2RS-XL", "PWTR45100-2RS-XL" ], "locale_variants": {} }, { "sku": "NUTR50110", "brand": "FAG", "manufacturer_designation": "NUTR50110", "series": "nutr-series", "type": "support_roller", "d_mm": 50, "D_mm": 110, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 76, "static_load_kN": 130, "fatigue_load_limit_kN": 17.9, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 1690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×110×32 mm: the 110 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 76 kN and C0 130 kN for the NUTR double-row full-complement yoke-type track roller; the C/C0 ratio of 0.58 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 17.9 kN at 50 mm bore, equivalent to 1.52 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 2.38 kN per millimetre of rolling-element complement mass is 1.69 kg (1690 g), or 0.48 g per mm² of the 110×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 50 mm pin bore marks the medium range: mounting forces and fits become critical, and the 1690 g mass calls for proper induction or press tooling rather than hand fitting Two roller rows across the 32 mm width provide C 76 kN and C0 130 kN, with the thick outer ring profiled to tolerate track misalignment Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 110 mm track diameter and 76 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 50 mm seat, and in robotic arm linear axes the 1.69 kg mass is part of the rotor inertia calculation. Designers also specify it for automotive welding jig rollers, relying on the 32 mm width and the published 130 kN static rating. Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not. Check the mating track hardness and flatness — a soft or scalloped rail fails before the 110 mm outer ring does.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Full-complement NATV/NUTR/PWTR rollers make heat and flat-spot easily — slow continuous rotation is fine, stationary load on a turning track is not.", "Check the mating track hardness and flatness — a soft or scalloped rail fails before the 110 mm outer ring does.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the NUTR50110?", "a": "The NUTR50110 is a NUTR double-row full-complement yoke-type track roller with 110 mm outside diameter, 50 mm bore and 32 mm width, envelope 50×110×32 mm. Mass is 1.69 kg." }, { "q": "What does the NUTR50110 designation mean in the FAG/INA HR1 catalogue?", "a": "NUTR50110 identifies this NUTR double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 50×110×32 mm and the catalogue ratings are C 76 kN, C0 130 kN, Cur 17.9 kN." }, { "q": "What is the load capacity of the NUTR50110?", "a": "The basic dynamic load rating C is 76 kN and the basic static load rating C0 is 130 kN; the fatigue load limit Cur is 17.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUTR50110?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the NUTR50110?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 110 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "NUTR50110", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUTR50110", "NUTR50110" ], "locale_variants": {} }, { "sku": "PWTR50110-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWTR50110-2RS-XL", "series": "pwtr-series", "type": "support_roller", "d_mm": 50, "D_mm": 110, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 59, "static_load_kN": 95, "fatigue_load_limit_kN": 12.3, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 1690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 50×110×32 mm: the 110 mm outside diameter is the track-running surface — a thick-walled outer ring over a 50 mm bore — and the 32 mm width sets the contact width on the mating track the catalogue lists C 59 kN and C0 95 kN for the PWTR sealed double-row full-complement yoke-type track roller; the C/C0 ratio of 0.62 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 12.3 kN at 50 mm bore, equivalent to 1.18 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 50 mm bore takes the mounting pin or shaft; across the 32 mm contact width the dynamic rating works out to 1.84 kN per millimetre of rolling-element complement mass is 1.69 kg (1690 g), or 0.48 g per mm² of the 110×32 mm track envelope — inertia that the drive must accelerate on every index of the cam the 50 mm pin bore places this bearing in the medium band, where the 110 mm envelope already carries ratings in the tens of kilonewtons No thermal reference speed is published — the 1,100 r/min limiting speed is the design ceiling, set by roller and seal kinematics PWTR is the sealed double-row full-complement yoke roller: two cylindrical roller rows, 2RS contact seals both sides and the profiled (crowned) running surface on the 110 mm outer ring The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 50×110×32 mm envelope. With 2RS seals the 1690 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 110 mm track diameter and 59 kN dynamic rating match the duty. In conveyor transfer and diverting stations the unit fits a compact 50 mm seat, and in robotic arm linear axes the 1.69 kg mass is part of the rotor inertia calculation. Designers also specify it for automotive welding jig rollers, relying on the 32 mm width and the published 95 kN static rating. Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam. The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "outer-ring fatigue cracking across the unsupported track zone under excessive static load", "track-side brinelling when the mating rail is softer than the roller running surface", "flat spots from standing loads or very short oscillating strokes on full-complement rollers", "seal lip failure and grease loss after sustained running above the limiting speed (PP/2RSR executions)", "edge wear from skewed tracks that exceed the crowned-profile correction range", "pin-seat fretting where a hard journal requirement (RSTO/RNA22) was met with a soft pin", "roller walk-off in flangeless STO/RSTO executions with uncontrolled lateral float", "contamination entry through open sides in dusty or wash-down environments", "cage fracture in caged NATR/STO rollers exposed to heavy shock" ], "pitfalls": [ "Yoke lugs must support the pin on both sides over its full length — single-sided support turns the pin into a cantilever beam.", "The crowned outer profile tolerates only small skew; a track that departs by more than the catalogue angle still causes edge loading.", "The pin or shaft is part of the bearing system: harden it for RSTO/RNA22 positions, and size its deflection because the roller cannot compensate for a bent pin." ], "faq": [ { "q": "What are the dimensions of the PWTR50110-2RS-XL?", "a": "The PWTR50110-2RS-XL is a PWTR sealed double-row full-complement yoke-type track roller with 110 mm outside diameter, 50 mm bore and 32 mm width, envelope 50×110×32 mm. Mass is 1.69 kg." }, { "q": "What does the PWTR50110-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWTR50110-2RS-XL identifies this PWTR sealed double-row full-complement yoke-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 50×110×32 mm and the catalogue ratings are C 59 kN, C0 95 kN, Cur 12.3 kN." }, { "q": "What is the load capacity of the PWTR50110-2RS-XL?", "a": "The basic dynamic load rating C is 59 kN and the basic static load rating C0 is 95 kN; the fatigue load limit Cur is 12.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWTR50110-2RS-XL?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "What must the mating track and pin look like for the PWTR50110-2RS-XL?", "a": "The track should be flat, harder than the roller contact and clean; the crowned 110 mm outer surface tolerates only small angular error. The inner ring lets the 50 mm pin run at normal machined tolerance; lateral guidance comes from the adjacent structure on flangeless executions." } ], "cross_ref": [ { "equiv_sku": "PWTR50110", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1454", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWTR50110-2RS-XL", "PWTR50110-2RS-XL" ], "locale_variants": {} }, { "sku": "KR16", "brand": "FAG", "manufacturer_designation": "KR16", "series": "kr-series", "type": "cam_follower", "d_mm": 6, "D_mm": 16, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.15, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 19, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 6×16×28 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm stud — and the 28 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.15 kN and C0 3.4 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.93 reflects a rolling-element pack sized for heavy static track loading, and the 5.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.46 kN at 6 mm stud, equivalent to 0.53 kN of dynamic rating per millimetre — the limiting speed is 14,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 28 mm overall stud length mass is 19 g, or 0.04 g per mm² of the 16×28 mm track envelope — inertia that the drive must accelerate on every index of the cam the 6 mm stud shank sits in the miniature band; at 28 mm wide the KR16 is built into compact cam drives, indexing pawls and light linkages C 3.15 kN, C0 3.4 kN and Cur 0.46 kN are the cam-contact ratings; the limiting speed is 14,000 r/min with no reference speed published The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 16 mm track diameter and 3.15 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 19 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 28 mm stud length and the published 3.4 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the KR16?", "a": "The KR16 is a KR stud-type cam follower with needle roller and cage assembly with 16 mm outside diameter, 6 mm stud diameter and 28 mm overall length, envelope 6×16×28 mm. Mass is 19 g." }, { "q": "What does the KR16 designation mean in the FAG/INA HR1 catalogue?", "a": "KR16 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×16×28 mm and the catalogue ratings are C 3.15 kN, C0 3.4 kN, Cur 0.46 kN." }, { "q": "What is the load capacity of the KR16?", "a": "The basic dynamic load rating C is 3.15 kN and the basic static load rating C0 is 3.4 kN; the fatigue load limit Cur is 0.46 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR16?", "a": "HR1 lists a limiting speed of 14,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR16 fitted and adjusted?", "a": "The 6 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 16 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR16-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR16", "KR16" ], "locale_variants": {} }, { "sku": "KR16-PP", "brand": "FAG", "manufacturer_designation": "KR16-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 6, "D_mm": 16, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.15, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 18, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 6×16×28 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm stud — and the 28 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.15 kN and C0 3.4 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.93 reflects a rolling-element pack sized for heavy static track loading, and the 5.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.46 kN at 6 mm stud, equivalent to 0.53 kN of dynamic rating per millimetre — the limiting speed is 14,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 28 mm overall stud length mass is 18 g, or 0.04 g per mm² of the 16×28 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm stud shank and only 18 g: the smallest sizes demand accurate shaft geometry, because the 5.0 mm section leaves no tolerance for a soft or tapered seat C 3.15 kN, C0 3.4 kN and Cur 0.46 kN are the cam-contact ratings; the limiting speed is 14,000 r/min with no reference speed published Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 28 mm overall stud length The PP seals make this a maintenance-free unit: the 3.15 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 16 mm track diameter and 3.15 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 18 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 28 mm stud length and the published 3.4 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KR16-PP?", "a": "The KR16-PP is a KR stud-type cam follower with needle roller and cage assembly with 16 mm outside diameter, 6 mm stud diameter and 28 mm overall length, envelope 6×16×28 mm. Mass is 18 g." }, { "q": "What does the KR16-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR16-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×16×28 mm and the catalogue ratings are C 3.15 kN, C0 3.4 kN, Cur 0.46 kN." }, { "q": "What is the load capacity of the KR16-PP?", "a": "The basic dynamic load rating C is 3.15 kN and the basic static load rating C0 is 3.4 kN; the fatigue load limit Cur is 0.46 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR16-PP?", "a": "HR1 lists a limiting speed of 14,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR16-PP fitted and adjusted?", "a": "The 6 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 16 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR16", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR16-PP", "KR16-PP" ], "locale_variants": {} }, { "sku": "KRE16-PP", "brand": "FAG", "manufacturer_designation": "KRE16-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 6, "D_mm": 16, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.15, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 20, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 6×16×28 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm stud — and the 28 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.15 kN and C0 3.4 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.93 reflects a rolling-element pack sized for heavy static track loading, and the 5.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.46 kN at 6 mm stud, equivalent to 0.53 kN of dynamic rating per millimetre — the limiting speed is 14,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 28 mm overall stud length mass is 20 g, or 0.04 g per mm² of the 16×28 mm track envelope — inertia that the drive must accelerate on every index of the cam at 6 mm stud shank this is one of the smallest HR1 executions — chosen where a 16 mm envelope must carry line-contact loads that no miniature ball bearing could take C 3.15 kN, C0 3.4 kN and Cur 0.46 kN are the cam-contact ratings; the limiting speed is 14,000 r/min with no reference speed published The caged pack keeps friction and inertia low — at 20 g this is the follower for fast indexing drives and high-cycle linkages Reading -PP: rubbing seals at each face of the 16 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 16 mm track diameter and 3.15 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 20 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 28 mm stud length and the published 3.4 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the KRE16-PP?", "a": "The KRE16-PP is a KRE stud-type cam follower with eccentric locking collar with 16 mm outside diameter, 6 mm stud diameter and 28 mm overall length, envelope 6×16×28 mm. Mass is 20 g." }, { "q": "What does the KRE16-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE16-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×16×28 mm and the catalogue ratings are C 3.15 kN, C0 3.4 kN, Cur 0.46 kN." }, { "q": "What is the load capacity of the KRE16-PP?", "a": "The basic dynamic load rating C is 3.15 kN and the basic static load rating C0 is 3.4 kN; the fatigue load limit Cur is 0.46 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE16-PP?", "a": "HR1 lists a limiting speed of 14,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE16-PP fitted and adjusted?", "a": "The 6 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 16 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE16", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE16-PP", "KRE16-PP" ], "locale_variants": {} }, { "sku": "KR16-SK-PP", "brand": "FAG", "manufacturer_designation": "KR16-SK-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 6, "D_mm": 16, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.15, "static_load_kN": 3.4, "fatigue_load_limit_kN": 0.46, "limiting_speed_rpm": 14000, "max_rpm": 14000, "weight_g": 19, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 6×16×28 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm stud — and the 28 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.15 kN and C0 3.4 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.93 reflects a rolling-element pack sized for heavy static track loading, and the 5.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.46 kN at 6 mm stud, equivalent to 0.53 kN of dynamic rating per millimetre — the limiting speed is 14,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 28 mm overall stud length mass is 19 g, or 0.04 g per mm² of the 16×28 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm stud shank and only 19 g: the smallest sizes demand accurate shaft geometry, because the 5.0 mm section leaves no tolerance for a soft or tapered seat Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 28 mm overall stud length; the SK variant carries a hexagon socket in the stud for a key drive The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 3.4 kN static rating and skews the outer ring The PP seals make this a maintenance-free unit: the 3.15 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. -SK is a mounting-aid suffix only; the 3.15 kN rating and PP sealing are unchanged from the standard KR execution. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 16 mm track diameter and 3.15 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 19 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 28 mm stud length and the published 3.4 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 28 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KR16-SK-PP?", "a": "The KR16-SK-PP is a KR stud-type cam follower with needle roller and cage assembly with 16 mm outside diameter, 6 mm stud diameter and 28 mm overall length, envelope 6×16×28 mm. Mass is 19 g." }, { "q": "What does the KR16-SK-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR16-SK-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×16×28 mm and the catalogue ratings are C 3.15 kN, C0 3.4 kN, Cur 0.46 kN." }, { "q": "What is the load capacity of the KR16-SK-PP?", "a": "The basic dynamic load rating C is 3.15 kN and the basic static load rating C0 is 3.4 kN; the fatigue load limit Cur is 0.46 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR16-SK-PP?", "a": "HR1 lists a limiting speed of 14,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR16-SK-PP fitted and adjusted?", "a": "The 6 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 16 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR16", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR16-SK-PP", "KR16-SK-PP" ], "locale_variants": {} }, { "sku": "KRV16-PP", "brand": "FAG", "manufacturer_designation": "KRV16-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 6, "D_mm": 16, "B_mm": 28, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4.9, "static_load_kN": 6.7, "fatigue_load_limit_kN": 0.97, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 19, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 6×16×28 mm: the 16 mm outside diameter is the track-running surface — a thick-walled outer ring over a 6 mm stud — and the 28 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 4.9 kN and C0 6.7 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.73 reflects a rolling-element pack sized for heavy static track loading, and the 5.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.97 kN at 6 mm stud, equivalent to 0.82 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 6 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.18 kN per millimetre of rolling-element complement within the 28 mm overall stud length mass is 19 g, or 0.04 g per mm² of the 16×28 mm track envelope — inertia that the drive must accelerate on every index of the cam 6 mm stud shank and only 19 g: the smallest sizes demand accurate shaft geometry, because the 5.0 mm section leaves no tolerance for a soft or tapered seat C 4.9 kN, C0 6.7 kN and Cur 0.97 kN are the cam-contact ratings; the limiting speed is 3,800 r/min with no reference speed published The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 6.7 kN static rating and skews the outer ring The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 3,800 r/min limiting speed. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 16 mm track diameter and 4.9 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 19 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 28 mm stud length and the published 6.7 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 28 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KRV16-PP?", "a": "The KRV16-PP is a KRV full-complement stud-type cam follower with 16 mm outside diameter, 6 mm stud diameter and 28 mm overall length, envelope 6×16×28 mm. Mass is 19 g." }, { "q": "What does the KRV16-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV16-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 6×16×28 mm and the catalogue ratings are C 4.9 kN, C0 6.7 kN, Cur 0.97 kN." }, { "q": "What is the load capacity of the KRV16-PP?", "a": "The basic dynamic load rating C is 4.9 kN and the basic static load rating C0 is 6.7 kN; the fatigue load limit Cur is 0.97 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV16-PP?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV16-PP fitted and adjusted?", "a": "The 6 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 16 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV16", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV16-PP", "KRV16-PP" ], "locale_variants": {} }, { "sku": "KR19", "brand": "FAG", "manufacturer_designation": "KR19", "series": "kr-series", "type": "cam_follower", "d_mm": 8, "D_mm": 19, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.5, "static_load_kN": 4.05, "fatigue_load_limit_kN": 0.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 29, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 8×19×32 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm stud — and the 32 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.5 kN and C0 4.05 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.86 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.55 kN at 8 mm stud, equivalent to 0.44 kN of dynamic rating per millimetre — the limiting speed is 11,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 32 mm overall stud length mass is 29 g, or 0.05 g per mm² of the 19×32 mm track envelope — inertia that the drive must accelerate on every index of the cam the 8 mm stud shank sits in the miniature band; at 32 mm wide the KR19 is built into compact cam drives, indexing pawls and light linkages KR is the stud-type cam follower with a needle roller and cage assembly: the 8 mm threaded stud bolts into the bracket and the 19 mm crowned outer ring follows the cam The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 19 mm track diameter and 3.5 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 29 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 32 mm stud length and the published 4.05 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the KR19?", "a": "The KR19 is a KR stud-type cam follower with needle roller and cage assembly with 19 mm outside diameter, 8 mm stud diameter and 32 mm overall length, envelope 8×19×32 mm. Mass is 29 g." }, { "q": "What does the KR19 designation mean in the FAG/INA HR1 catalogue?", "a": "KR19 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×19×32 mm and the catalogue ratings are C 3.5 kN, C0 4.05 kN, Cur 0.55 kN." }, { "q": "What is the load capacity of the KR19?", "a": "The basic dynamic load rating C is 3.5 kN and the basic static load rating C0 is 4.05 kN; the fatigue load limit Cur is 0.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR19?", "a": "HR1 lists a limiting speed of 11,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR19 fitted and adjusted?", "a": "The 8 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 19 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR19-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR19", "KR19" ], "locale_variants": {} }, { "sku": "KR19-PP", "brand": "FAG", "manufacturer_designation": "KR19-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 8, "D_mm": 19, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.5, "static_load_kN": 4.05, "fatigue_load_limit_kN": 0.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 29, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 8×19×32 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm stud — and the 32 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.5 kN and C0 4.05 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.86 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.55 kN at 8 mm stud, equivalent to 0.44 kN of dynamic rating per millimetre — the limiting speed is 11,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 32 mm overall stud length mass is 29 g, or 0.05 g per mm² of the 19×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 8 mm stud shank and only 29 g: the smallest sizes demand accurate shaft geometry, because the 5.5 mm section leaves no tolerance for a soft or tapered seat KR is the stud-type cam follower with a needle roller and cage assembly: the 8 mm threaded stud bolts into the bracket and the 19 mm crowned outer ring follows the cam The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 4.05 kN static rating and skews the outer ring -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 32 mm width. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 19 mm track diameter and 3.5 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 29 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 32 mm stud length and the published 4.05 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 32 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KR19-PP?", "a": "The KR19-PP is a KR stud-type cam follower with needle roller and cage assembly with 19 mm outside diameter, 8 mm stud diameter and 32 mm overall length, envelope 8×19×32 mm. Mass is 29 g." }, { "q": "What does the KR19-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR19-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×19×32 mm and the catalogue ratings are C 3.5 kN, C0 4.05 kN, Cur 0.55 kN." }, { "q": "What is the load capacity of the KR19-PP?", "a": "The basic dynamic load rating C is 3.5 kN and the basic static load rating C0 is 4.05 kN; the fatigue load limit Cur is 0.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR19-PP?", "a": "HR1 lists a limiting speed of 11,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR19-PP fitted and adjusted?", "a": "The 8 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 19 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR19", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR19-PP", "KR19-PP" ], "locale_variants": {} }, { "sku": "KRE19-PP", "brand": "FAG", "manufacturer_designation": "KRE19-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 8, "D_mm": 19, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.5, "static_load_kN": 4.05, "fatigue_load_limit_kN": 0.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 32, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 8×19×32 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm stud — and the 32 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.5 kN and C0 4.05 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.86 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.55 kN at 8 mm stud, equivalent to 0.44 kN of dynamic rating per millimetre — the limiting speed is 11,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 32 mm overall stud length mass is 32 g, or 0.05 g per mm² of the 19×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 8 mm stud shank and only 32 g: the smallest sizes demand accurate shaft geometry, because the 5.5 mm section leaves no tolerance for a soft or tapered seat C 3.5 kN, C0 4.05 kN and Cur 0.55 kN are the cam-contact ratings; the limiting speed is 11,000 r/min with no reference speed published Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 32 mm overall stud length The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 11,000 r/min limiting speed. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 19 mm track diameter and 3.5 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 32 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 32 mm stud length and the published 4.05 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KRE19-PP?", "a": "The KRE19-PP is a KRE stud-type cam follower with eccentric locking collar with 19 mm outside diameter, 8 mm stud diameter and 32 mm overall length, envelope 8×19×32 mm. Mass is 32 g." }, { "q": "What does the KRE19-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE19-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×19×32 mm and the catalogue ratings are C 3.5 kN, C0 4.05 kN, Cur 0.55 kN." }, { "q": "What is the load capacity of the KRE19-PP?", "a": "The basic dynamic load rating C is 3.5 kN and the basic static load rating C0 is 4.05 kN; the fatigue load limit Cur is 0.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE19-PP?", "a": "HR1 lists a limiting speed of 11,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE19-PP fitted and adjusted?", "a": "The 8 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 19 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE19", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE19-PP", "KRE19-PP" ], "locale_variants": {} }, { "sku": "KR19-SK-PP", "brand": "FAG", "manufacturer_designation": "KR19-SK-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 8, "D_mm": 19, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 3.5, "static_load_kN": 4.05, "fatigue_load_limit_kN": 0.55, "limiting_speed_rpm": 11000, "max_rpm": 11000, "weight_g": 29, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 8×19×32 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm stud — and the 32 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 3.5 kN and C0 4.05 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.86 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.55 kN at 8 mm stud, equivalent to 0.44 kN of dynamic rating per millimetre — the limiting speed is 11,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.11 kN per millimetre of rolling-element complement within the 32 mm overall stud length mass is 29 g, or 0.05 g per mm² of the 19×32 mm track envelope — inertia that the drive must accelerate on every index of the cam at 8 mm stud shank this is one of the smallest HR1 executions — chosen where a 19 mm envelope must carry line-contact loads that no miniature ball bearing could take Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 32 mm overall stud length; the SK variant carries a hexagon socket in the stud for a key drive The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload Reading -PP: rubbing seals at each face of the 19 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. The SK socket prevents the stud from turning as the mounting nut is torqued, protecting the threaded 32 mm-long shank and the bracket faces. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 19 mm track diameter and 3.5 kN dynamic rating match the duty. In cam drives and indexing tables the threaded stud bolts directly to the frame, and in printing press sheet-transfer grippers the 29 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 32 mm stud length and the published 4.05 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the KR19-SK-PP?", "a": "The KR19-SK-PP is a KR stud-type cam follower with needle roller and cage assembly with 19 mm outside diameter, 8 mm stud diameter and 32 mm overall length, envelope 8×19×32 mm. Mass is 29 g." }, { "q": "What does the KR19-SK-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR19-SK-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×19×32 mm and the catalogue ratings are C 3.5 kN, C0 4.05 kN, Cur 0.55 kN." }, { "q": "What is the load capacity of the KR19-SK-PP?", "a": "The basic dynamic load rating C is 3.5 kN and the basic static load rating C0 is 4.05 kN; the fatigue load limit Cur is 0.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR19-SK-PP?", "a": "HR1 lists a limiting speed of 11,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR19-SK-PP fitted and adjusted?", "a": "The 8 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 19 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR19", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR19-SK-PP", "KR19-SK-PP" ], "locale_variants": {} }, { "sku": "KRV19-PP", "brand": "FAG", "manufacturer_designation": "KRV19-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 8, "D_mm": 19, "B_mm": 32, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5.4, "static_load_kN": 8.1, "fatigue_load_limit_kN": 1.19, "limiting_speed_rpm": 3100, "max_rpm": 3100, "weight_g": 31, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 8×19×32 mm: the 19 mm outside diameter is the track-running surface — a thick-walled outer ring over a 8 mm stud — and the 32 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 5.4 kN and C0 8.1 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 5.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.19 kN at 8 mm stud, equivalent to 0.68 kN of dynamic rating per millimetre — the limiting speed is 3,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 8 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.17 kN per millimetre of rolling-element complement within the 32 mm overall stud length mass is 31 g, or 0.05 g per mm² of the 19×32 mm track envelope — inertia that the drive must accelerate on every index of the cam 8 mm stud shank and only 31 g: the smallest sizes demand accurate shaft geometry, because the 5.5 mm section leaves no tolerance for a soft or tapered seat Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 32 mm overall stud length The full complement raises static capacity but lowers the speed ceiling and generates more friction torque — slow, heavily loaded cams are its duty -PP protection suits cams and rails that are washed down or run in dust; exceeding the 3,100 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 19 mm track diameter and 5.4 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 31 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 32 mm stud length and the published 8.1 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 32 mm stud unusable. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 32 mm stud unusable.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the KRV19-PP?", "a": "The KRV19-PP is a KRV full-complement stud-type cam follower with 19 mm outside diameter, 8 mm stud diameter and 32 mm overall length, envelope 8×19×32 mm. Mass is 31 g." }, { "q": "What does the KRV19-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV19-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 8×19×32 mm and the catalogue ratings are C 5.4 kN, C0 8.1 kN, Cur 1.19 kN." }, { "q": "What is the load capacity of the KRV19-PP?", "a": "The basic dynamic load rating C is 5.4 kN and the basic static load rating C0 is 8.1 kN; the fatigue load limit Cur is 1.19 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV19-PP?", "a": "HR1 lists a limiting speed of 3,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV19-PP fitted and adjusted?", "a": "The 8 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 19 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV19", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV19-PP", "KRV19-PP" ], "locale_variants": {} }, { "sku": "KR22", "brand": "FAG", "manufacturer_designation": "KR22", "series": "kr-series", "type": "cam_follower", "d_mm": 10, "D_mm": 22, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.55, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.74, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 45, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×22×36 mm: the 22 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 4.55 kN and C0 5.4 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.84 reflects a rolling-element pack sized for heavy static track loading, and the 6.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.74 kN at 10 mm stud, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.13 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 45 g, or 0.06 g per mm² of the 22×36 mm track envelope — inertia that the drive must accelerate on every index of the cam the 10 mm stud shank sits in the miniature band; at 36 mm wide the KR22 is built into compact cam drives, indexing pawls and light linkages KR is the stud-type cam follower with a needle roller and cage assembly: the 10 mm threaded stud bolts into the bracket and the 22 mm crowned outer ring follows the cam C 4.55 kN, C0 5.4 kN and Cur 0.74 kN are the cam-contact ratings; the limiting speed is 8,000 r/min with no reference speed published Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 22 mm track diameter and 4.55 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 45 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 36 mm stud length and the published 5.4 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 36 mm stud unusable. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 36 mm stud unusable.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the KR22?", "a": "The KR22 is a KR stud-type cam follower with needle roller and cage assembly with 22 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×22×36 mm. Mass is 45 g." }, { "q": "What does the KR22 designation mean in the FAG/INA HR1 catalogue?", "a": "KR22 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×22×36 mm and the catalogue ratings are C 4.55 kN, C0 5.4 kN, Cur 0.74 kN." }, { "q": "What is the load capacity of the KR22?", "a": "The basic dynamic load rating C is 4.55 kN and the basic static load rating C0 is 5.4 kN; the fatigue load limit Cur is 0.74 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR22?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR22 fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 22 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR22-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR22", "KR22" ], "locale_variants": {} }, { "sku": "KR22-PP", "brand": "FAG", "manufacturer_designation": "KR22-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 10, "D_mm": 22, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.55, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.74, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 43, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×22×36 mm: the 22 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 4.55 kN and C0 5.4 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.84 reflects a rolling-element pack sized for heavy static track loading, and the 6.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.74 kN at 10 mm stud, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.13 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 43 g, or 0.05 g per mm² of the 22×36 mm track envelope — inertia that the drive must accelerate on every index of the cam at 10 mm stud shank this is one of the smallest HR1 executions — chosen where a 22 mm envelope must carry line-contact loads that no miniature ball bearing could take Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 36 mm overall stud length The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 36 mm width. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 22 mm track diameter and 4.55 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 43 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 36 mm stud length and the published 5.4 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KR22-PP?", "a": "The KR22-PP is a KR stud-type cam follower with needle roller and cage assembly with 22 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×22×36 mm. Mass is 43 g." }, { "q": "What does the KR22-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR22-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×22×36 mm and the catalogue ratings are C 4.55 kN, C0 5.4 kN, Cur 0.74 kN." }, { "q": "What is the load capacity of the KR22-PP?", "a": "The basic dynamic load rating C is 4.55 kN and the basic static load rating C0 is 5.4 kN; the fatigue load limit Cur is 0.74 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR22-PP?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR22-PP fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 22 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR22", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR22-PP", "KR22-PP" ], "locale_variants": {} }, { "sku": "KRE22-PP", "brand": "FAG", "manufacturer_designation": "KRE22-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 10, "D_mm": 22, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.55, "static_load_kN": 5.4, "fatigue_load_limit_kN": 0.74, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 47, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×22×36 mm: the 22 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 4.55 kN and C0 5.4 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.84 reflects a rolling-element pack sized for heavy static track loading, and the 6.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.74 kN at 10 mm stud, equivalent to 0.45 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.13 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 47 g, or 0.06 g per mm² of the 22×36 mm track envelope — inertia that the drive must accelerate on every index of the cam at 10 mm stud shank this is one of the smallest HR1 executions — chosen where a 22 mm envelope must carry line-contact loads that no miniature ball bearing could take KRE adds the eccentric locking collar: rotating the collar on the stud re-centres the roller against the cam to set preload or compensate wear without re-machining the bracket The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately The PP seals make this a maintenance-free unit: the 4.55 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 22 mm track diameter and 4.55 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 47 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 36 mm stud length and the published 5.4 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KRE22-PP?", "a": "The KRE22-PP is a KRE stud-type cam follower with eccentric locking collar with 22 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×22×36 mm. Mass is 47 g." }, { "q": "What does the KRE22-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE22-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×22×36 mm and the catalogue ratings are C 4.55 kN, C0 5.4 kN, Cur 0.74 kN." }, { "q": "What is the load capacity of the KRE22-PP?", "a": "The basic dynamic load rating C is 4.55 kN and the basic static load rating C0 is 5.4 kN; the fatigue load limit Cur is 0.74 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE22-PP?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE22-PP fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 22 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE22", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE22-PP", "KRE22-PP" ], "locale_variants": {} }, { "sku": "KRV22-PP", "brand": "FAG", "manufacturer_designation": "KRV22-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 10, "D_mm": 22, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 6.2, "static_load_kN": 9.3, "fatigue_load_limit_kN": 1.23, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 45, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×22×36 mm: the 22 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 6.2 kN and C0 9.3 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 6.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.23 kN at 10 mm stud, equivalent to 0.62 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.17 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 45 g, or 0.06 g per mm² of the 22×36 mm track envelope — inertia that the drive must accelerate on every index of the cam at 10 mm stud shank this is one of the smallest HR1 executions — chosen where a 22 mm envelope must carry line-contact loads that no miniature ball bearing could take The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload The full complement raises static capacity but lowers the speed ceiling and generates more friction torque — slow, heavily loaded cams are its duty -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 36 mm width. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 22 mm track diameter and 6.2 kN dynamic rating match the duty. In cam drives and indexing tables the threaded stud bolts directly to the frame, and in printing press sheet-transfer grippers the 45 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 36 mm stud length and the published 9.3 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KRV22-PP?", "a": "The KRV22-PP is a KRV full-complement stud-type cam follower with 22 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×22×36 mm. Mass is 45 g." }, { "q": "What does the KRV22-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV22-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×22×36 mm and the catalogue ratings are C 6.2 kN, C0 9.3 kN, Cur 1.23 kN." }, { "q": "What is the load capacity of the KRV22-PP?", "a": "The basic dynamic load rating C is 6.2 kN and the basic static load rating C0 is 9.3 kN; the fatigue load limit Cur is 1.23 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV22-PP?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV22-PP fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 22 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV22", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV22-PP", "KRV22-PP" ], "locale_variants": {} }, { "sku": "KR26", "brand": "FAG", "manufacturer_designation": "KR26", "series": "kr-series", "type": "cam_follower", "d_mm": 10, "D_mm": 26, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.1, "static_load_kN": 6.5, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 59, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×26×36 mm: the 26 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 5.1 kN and C0 6.5 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.86 kN at 10 mm stud, equivalent to 0.51 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.14 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 59 g, or 0.06 g per mm² of the 26×36 mm track envelope — inertia that the drive must accelerate on every index of the cam 10 mm stud shank and only 59 g: the smallest sizes demand accurate shaft geometry, because the 8.0 mm section leaves no tolerance for a soft or tapered seat The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 6.5 kN static rating and skews the outer ring Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 26 mm track diameter and 5.1 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 59 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 36 mm stud length and the published 6.5 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 36 mm stud unusable.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 36 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the KR26?", "a": "The KR26 is a KR stud-type cam follower with needle roller and cage assembly with 26 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×26×36 mm. Mass is 59 g." }, { "q": "What does the KR26 designation mean in the FAG/INA HR1 catalogue?", "a": "KR26 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×26×36 mm and the catalogue ratings are C 5.1 kN, C0 6.5 kN, Cur 0.86 kN." }, { "q": "What is the load capacity of the KR26?", "a": "The basic dynamic load rating C is 5.1 kN and the basic static load rating C0 is 6.5 kN; the fatigue load limit Cur is 0.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR26?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR26 fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 26 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR26-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR26", "KR26" ], "locale_variants": {} }, { "sku": "KR26-PP", "brand": "FAG", "manufacturer_designation": "KR26-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 10, "D_mm": 26, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.1, "static_load_kN": 6.5, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 57, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×26×36 mm: the 26 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 5.1 kN and C0 6.5 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.86 kN at 10 mm stud, equivalent to 0.51 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.14 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 57 g, or 0.06 g per mm² of the 26×36 mm track envelope — inertia that the drive must accelerate on every index of the cam 10 mm stud shank and only 57 g: the smallest sizes demand accurate shaft geometry, because the 8.0 mm section leaves no tolerance for a soft or tapered seat The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately Reading -PP: rubbing seals at each face of the 26 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 26 mm track diameter and 5.1 kN dynamic rating match the duty. In cam drives and indexing tables the threaded stud bolts directly to the frame, and in printing press sheet-transfer grippers the 57 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 36 mm stud length and the published 6.5 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KR26-PP?", "a": "The KR26-PP is a KR stud-type cam follower with needle roller and cage assembly with 26 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×26×36 mm. Mass is 57 g." }, { "q": "What does the KR26-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR26-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×26×36 mm and the catalogue ratings are C 5.1 kN, C0 6.5 kN, Cur 0.86 kN." }, { "q": "What is the load capacity of the KR26-PP?", "a": "The basic dynamic load rating C is 5.1 kN and the basic static load rating C0 is 6.5 kN; the fatigue load limit Cur is 0.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR26-PP?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR26-PP fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 26 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR26", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR26-PP", "KR26-PP" ], "locale_variants": {} }, { "sku": "KRE26-PP", "brand": "FAG", "manufacturer_designation": "KRE26-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 10, "D_mm": 26, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.1, "static_load_kN": 6.5, "fatigue_load_limit_kN": 0.86, "limiting_speed_rpm": 8000, "max_rpm": 8000, "weight_g": 62, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×26×36 mm: the 26 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 5.1 kN and C0 6.5 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 0.86 kN at 10 mm stud, equivalent to 0.51 kN of dynamic rating per millimetre — the limiting speed is 8,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.14 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 62 g, or 0.07 g per mm² of the 26×36 mm track envelope — inertia that the drive must accelerate on every index of the cam at 10 mm stud shank this is one of the smallest HR1 executions — chosen where a 26 mm envelope must carry line-contact loads that no miniature ball bearing could take KR is the stud-type cam follower with a needle roller and cage assembly: the 10 mm threaded stud bolts into the bracket and the 26 mm crowned outer ring follows the cam Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 36 mm overall stud length The PP seals make this a maintenance-free unit: the 5.1 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 26 mm track diameter and 5.1 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 62 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 36 mm stud length and the published 6.5 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 36 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KRE26-PP?", "a": "The KRE26-PP is a KRE stud-type cam follower with eccentric locking collar with 26 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×26×36 mm. Mass is 62 g." }, { "q": "What does the KRE26-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE26-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×26×36 mm and the catalogue ratings are C 5.1 kN, C0 6.5 kN, Cur 0.86 kN." }, { "q": "What is the load capacity of the KRE26-PP?", "a": "The basic dynamic load rating C is 5.1 kN and the basic static load rating C0 is 6.5 kN; the fatigue load limit Cur is 0.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE26-PP?", "a": "HR1 lists a limiting speed of 8,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE26-PP fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 26 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE26", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE26-PP", "KRE26-PP" ], "locale_variants": {} }, { "sku": "KRV26-PP", "brand": "FAG", "manufacturer_designation": "KRV26-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 10, "D_mm": 26, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 7.3, "static_load_kN": 11.6, "fatigue_load_limit_kN": 1.52, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 59, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 10×26×36 mm: the 26 mm outside diameter is the track-running surface — a thick-walled outer ring over a 10 mm stud — and the 36 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 7.3 kN and C0 11.6 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.63 reflects a rolling-element pack sized for heavy static track loading, and the 8.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.52 kN at 10 mm stud, equivalent to 0.73 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 10 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.20 kN per millimetre of rolling-element complement within the 36 mm overall stud length mass is 59 g, or 0.06 g per mm² of the 26×36 mm track envelope — inertia that the drive must accelerate on every index of the cam 10 mm stud shank and only 59 g: the smallest sizes demand accurate shaft geometry, because the 8.0 mm section leaves no tolerance for a soft or tapered seat C 7.3 kN, C0 11.6 kN and Cur 1.52 kN are the cam-contact ratings; the limiting speed is 2,600 r/min with no reference speed published The full complement raises static capacity but lowers the speed ceiling and generates more friction torque — slow, heavily loaded cams are its duty -PP protection suits cams and rails that are washed down or run in dust; exceeding the 2,600 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 26 mm track diameter and 7.3 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 59 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 36 mm stud length and the published 11.6 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the KRV26-PP?", "a": "The KRV26-PP is a KRV full-complement stud-type cam follower with 26 mm outside diameter, 10 mm stud diameter and 36 mm overall length, envelope 10×26×36 mm. Mass is 59 g." }, { "q": "What does the KRV26-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV26-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 10×26×36 mm and the catalogue ratings are C 7.3 kN, C0 11.6 kN, Cur 1.52 kN." }, { "q": "What is the load capacity of the KRV26-PP?", "a": "The basic dynamic load rating C is 7.3 kN and the basic static load rating C0 is 11.6 kN; the fatigue load limit Cur is 1.52 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV26-PP?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV26-PP fitted and adjusted?", "a": "The 10 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 26 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV26", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV26-PP", "KRV26-PP" ], "locale_variants": {} }, { "sku": "KR30", "brand": "FAG", "manufacturer_designation": "KR30", "series": "kr-series", "type": "cam_follower", "d_mm": 12, "D_mm": 30, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.8, "static_load_kN": 8.7, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 92, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×30×40 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 6.8 kN and C0 8.7 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 9.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.24 kN at 12 mm stud, equivalent to 0.57 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.17 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 92 g, or 0.08 g per mm² of the 30×40 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm stud shank this is one of the smallest HR1 executions — chosen where a 30 mm envelope must carry line-contact loads that no miniature ball bearing could take The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 30 mm track diameter and 6.8 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 92 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 40 mm stud length and the published 8.7 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the KR30?", "a": "The KR30 is a KR stud-type cam follower with needle roller and cage assembly with 30 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×30×40 mm. Mass is 92 g." }, { "q": "What does the KR30 designation mean in the FAG/INA HR1 catalogue?", "a": "KR30 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×30×40 mm and the catalogue ratings are C 6.8 kN, C0 8.7 kN, Cur 1.24 kN." }, { "q": "What is the load capacity of the KR30?", "a": "The basic dynamic load rating C is 6.8 kN and the basic static load rating C0 is 8.7 kN; the fatigue load limit Cur is 1.24 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR30?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR30 fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 30 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR30-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR30", "KR30" ], "locale_variants": {} }, { "sku": "KR30-PP", "brand": "FAG", "manufacturer_designation": "KR30-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 12, "D_mm": 30, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.8, "static_load_kN": 8.7, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 88, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×30×40 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 6.8 kN and C0 8.7 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 9.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.24 kN at 12 mm stud, equivalent to 0.57 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.17 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 88 g, or 0.07 g per mm² of the 30×40 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm stud shank this is one of the smallest HR1 executions — chosen where a 30 mm envelope must carry line-contact loads that no miniature ball bearing could take The caged pack keeps friction and inertia low — at 88 g this is the follower for fast indexing drives and high-cycle linkages The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 40 mm width. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 30 mm track diameter and 6.8 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 88 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 40 mm stud length and the published 8.7 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the KR30-PP?", "a": "The KR30-PP is a KR stud-type cam follower with needle roller and cage assembly with 30 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×30×40 mm. Mass is 88 g." }, { "q": "What does the KR30-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR30-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×30×40 mm and the catalogue ratings are C 6.8 kN, C0 8.7 kN, Cur 1.24 kN." }, { "q": "What is the load capacity of the KR30-PP?", "a": "The basic dynamic load rating C is 6.8 kN and the basic static load rating C0 is 8.7 kN; the fatigue load limit Cur is 1.24 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR30-PP?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR30-PP fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 30 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR30", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR30-PP", "KR30-PP" ], "locale_variants": {} }, { "sku": "KRE30-PP", "brand": "FAG", "manufacturer_designation": "KRE30-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 12, "D_mm": 30, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.8, "static_load_kN": 8.7, "fatigue_load_limit_kN": 1.24, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 93, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×30×40 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 6.8 kN and C0 8.7 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.78 reflects a rolling-element pack sized for heavy static track loading, and the 9.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.24 kN at 12 mm stud, equivalent to 0.57 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.17 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 93 g, or 0.08 g per mm² of the 30×40 mm track envelope — inertia that the drive must accelerate on every index of the cam the 12 mm stud shank sits in the miniature band; at 40 mm wide the KRE30-PP is built into compact cam drives, indexing pawls and light linkages KR is the stud-type cam follower with a needle roller and cage assembly: the 12 mm threaded stud bolts into the bracket and the 30 mm crowned outer ring follows the cam The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 8.7 kN static rating and skews the outer ring -PP protection suits cams and rails that are washed down or run in dust; exceeding the 5,500 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 30 mm track diameter and 6.8 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 93 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 40 mm stud length and the published 8.7 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 40 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KRE30-PP?", "a": "The KRE30-PP is a KRE stud-type cam follower with eccentric locking collar with 30 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×30×40 mm. Mass is 93 g." }, { "q": "What does the KRE30-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE30-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×30×40 mm and the catalogue ratings are C 6.8 kN, C0 8.7 kN, Cur 1.24 kN." }, { "q": "What is the load capacity of the KRE30-PP?", "a": "The basic dynamic load rating C is 6.8 kN and the basic static load rating C0 is 8.7 kN; the fatigue load limit Cur is 1.24 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE30-PP?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE30-PP fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 30 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE30", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE30-PP", "KRE30-PP" ], "locale_variants": {} }, { "sku": "KRV30-PP", "brand": "FAG", "manufacturer_designation": "KRV30-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 12, "D_mm": 30, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 9.4, "static_load_kN": 15.1, "fatigue_load_limit_kN": 2.08, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 91, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×30×40 mm: the 30 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 9.4 kN and C0 15.1 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.62 reflects a rolling-element pack sized for heavy static track loading, and the 9.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.08 kN at 12 mm stud, equivalent to 0.78 kN of dynamic rating per millimetre — the limiting speed is 2,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.24 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 91 g, or 0.08 g per mm² of the 30×40 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm stud shank this is one of the smallest HR1 executions — chosen where a 30 mm envelope must carry line-contact loads that no miniature ball bearing could take KRV is the full-complement stud-type cam follower: a cageless needle pack maximises C0 15.1 kN inside the 30 mm outer ring on the 12 mm stud Reading -PP: rubbing seals at each face of the 30 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 30 mm track diameter and 9.4 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 91 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 40 mm stud length and the published 15.1 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KRV30-PP?", "a": "The KRV30-PP is a KRV full-complement stud-type cam follower with 30 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×30×40 mm. Mass is 91 g." }, { "q": "What does the KRV30-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV30-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×30×40 mm and the catalogue ratings are C 9.4 kN, C0 15.1 kN, Cur 2.08 kN." }, { "q": "What is the load capacity of the KRV30-PP?", "a": "The basic dynamic load rating C is 9.4 kN and the basic static load rating C0 is 15.1 kN; the fatigue load limit Cur is 2.08 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV30-PP?", "a": "HR1 lists a limiting speed of 2,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV30-PP fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 30 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV30", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV30-PP", "KRV30-PP" ], "locale_variants": {} }, { "sku": "KR32", "brand": "FAG", "manufacturer_designation": "KR32", "series": "kr-series", "type": "cam_follower", "d_mm": 12, "D_mm": 32, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.1, "static_load_kN": 9.3, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 103, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×32×40 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 7.1 kN and C0 9.3 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.32 kN at 12 mm stud, equivalent to 0.59 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.18 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 103 g, or 0.08 g per mm² of the 32×40 mm track envelope — inertia that the drive must accelerate on every index of the cam 12 mm stud shank and only 103 g: the smallest sizes demand accurate shaft geometry, because the 10.0 mm section leaves no tolerance for a soft or tapered seat The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 32 mm track diameter and 7.1 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 103 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 40 mm stud length and the published 9.3 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KR32?", "a": "The KR32 is a KR stud-type cam follower with needle roller and cage assembly with 32 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×32×40 mm. Mass is 103 g." }, { "q": "What does the KR32 designation mean in the FAG/INA HR1 catalogue?", "a": "KR32 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×40 mm and the catalogue ratings are C 7.1 kN, C0 9.3 kN, Cur 1.32 kN." }, { "q": "What is the load capacity of the KR32?", "a": "The basic dynamic load rating C is 7.1 kN and the basic static load rating C0 is 9.3 kN; the fatigue load limit Cur is 1.32 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR32?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR32 fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 32 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR32-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR32", "KR32" ], "locale_variants": {} }, { "sku": "KR32-PP", "brand": "FAG", "manufacturer_designation": "KR32-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 12, "D_mm": 32, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.1, "static_load_kN": 9.3, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 98, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×32×40 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 7.1 kN and C0 9.3 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.32 kN at 12 mm stud, equivalent to 0.59 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.18 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 98 g, or 0.08 g per mm² of the 32×40 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm stud shank this is one of the smallest HR1 executions — chosen where a 32 mm envelope must carry line-contact loads that no miniature ball bearing could take C 7.1 kN, C0 9.3 kN and Cur 1.32 kN are the cam-contact ratings; the limiting speed is 5,500 r/min with no reference speed published The PP seals make this a maintenance-free unit: the 7.1 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 32 mm track diameter and 7.1 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 98 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 40 mm stud length and the published 9.3 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the KR32-PP?", "a": "The KR32-PP is a KR stud-type cam follower with needle roller and cage assembly with 32 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×32×40 mm. Mass is 98 g." }, { "q": "What does the KR32-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR32-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×40 mm and the catalogue ratings are C 7.1 kN, C0 9.3 kN, Cur 1.32 kN." }, { "q": "What is the load capacity of the KR32-PP?", "a": "The basic dynamic load rating C is 7.1 kN and the basic static load rating C0 is 9.3 kN; the fatigue load limit Cur is 1.32 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR32-PP?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR32-PP fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 32 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR32", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR32-PP", "KR32-PP" ], "locale_variants": {} }, { "sku": "KRE32-PP", "brand": "FAG", "manufacturer_designation": "KRE32-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 12, "D_mm": 32, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7.1, "static_load_kN": 9.3, "fatigue_load_limit_kN": 1.32, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 104, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×32×40 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 7.1 kN and C0 9.3 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.32 kN at 12 mm stud, equivalent to 0.59 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.18 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 104 g, or 0.08 g per mm² of the 32×40 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm stud shank this is one of the smallest HR1 executions — chosen where a 32 mm envelope must carry line-contact loads that no miniature ball bearing could take C 7.1 kN, C0 9.3 kN and Cur 1.32 kN are the cam-contact ratings; the limiting speed is 5,500 r/min with no reference speed published The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately Reading -PP: rubbing seals at each face of the 32 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 32 mm track diameter and 7.1 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 104 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 40 mm stud length and the published 9.3 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 40 mm stud unusable. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 40 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KRE32-PP?", "a": "The KRE32-PP is a KRE stud-type cam follower with eccentric locking collar with 32 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×32×40 mm. Mass is 104 g." }, { "q": "What does the KRE32-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE32-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×40 mm and the catalogue ratings are C 7.1 kN, C0 9.3 kN, Cur 1.32 kN." }, { "q": "What is the load capacity of the KRE32-PP?", "a": "The basic dynamic load rating C is 7.1 kN and the basic static load rating C0 is 9.3 kN; the fatigue load limit Cur is 1.32 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE32-PP?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE32-PP fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 32 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE32", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE32-PP", "KRE32-PP" ], "locale_variants": {} }, { "sku": "KRV32-PP", "brand": "FAG", "manufacturer_designation": "KRV32-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 12, "D_mm": 32, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 10, "static_load_kN": 16.3, "fatigue_load_limit_kN": 2.24, "limiting_speed_rpm": 2100, "max_rpm": 2100, "weight_g": 101, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 12×32×40 mm: the 32 mm outside diameter is the track-running surface — a thick-walled outer ring over a 12 mm stud — and the 40 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 10 kN and C0 16.3 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.61 reflects a rolling-element pack sized for heavy static track loading, and the 10.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.24 kN at 12 mm stud, equivalent to 0.83 kN of dynamic rating per millimetre — the limiting speed is 2,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 12 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.25 kN per millimetre of rolling-element complement within the 40 mm overall stud length mass is 101 g, or 0.08 g per mm² of the 32×40 mm track envelope — inertia that the drive must accelerate on every index of the cam at 12 mm stud shank this is one of the smallest HR1 executions — chosen where a 32 mm envelope must carry line-contact loads that no miniature ball bearing could take The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately The PP seals make this a maintenance-free unit: the 10 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 32 mm track diameter and 10 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 101 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 40 mm stud length and the published 16.3 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KRV32-PP?", "a": "The KRV32-PP is a KRV full-complement stud-type cam follower with 32 mm outside diameter, 12 mm stud diameter and 40 mm overall length, envelope 12×32×40 mm. Mass is 101 g." }, { "q": "What does the KRV32-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV32-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 12×32×40 mm and the catalogue ratings are C 10 kN, C0 16.3 kN, Cur 2.24 kN." }, { "q": "What is the load capacity of the KRV32-PP?", "a": "The basic dynamic load rating C is 10 kN and the basic static load rating C0 is 16.3 kN; the fatigue load limit Cur is 2.24 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV32-PP?", "a": "HR1 lists a limiting speed of 2,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV32-PP fitted and adjusted?", "a": "The 12 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 32 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV32", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1455", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV32-PP", "KRV32-PP" ], "locale_variants": {} }, { "sku": "KR35", "brand": "FAG", "manufacturer_designation": "KR35", "series": "kr-series", "type": "cam_follower", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.7, "static_load_kN": 14.5, "fatigue_load_limit_kN": 1.86, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 173, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 9.7 kN and C0 14.5 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.86 kN at 16 mm stud, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 3,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.19 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 173 g, or 0.10 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 16 mm stud shank the 52 mm width and 9.7 kN C rating suit high-cycle industrial machinery rather than instrument duty Reading KR/KRV/KRE: stud-type needle cam followers in the open execution and a 52 mm overall stud length The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 35 mm track diameter and 9.7 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 173 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 52 mm stud length and the published 14.5 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the KR35?", "a": "The KR35 is a KR stud-type cam follower with needle roller and cage assembly with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 173 g." }, { "q": "What does the KR35 designation mean in the FAG/INA HR1 catalogue?", "a": "KR35 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×35×52 mm and the catalogue ratings are C 9.7 kN, C0 14.5 kN, Cur 1.86 kN." }, { "q": "What is the load capacity of the KR35?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 14.5 kN; the fatigue load limit Cur is 1.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR35?", "a": "HR1 lists a limiting speed of 3,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR35 fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR35-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR35", "KR35" ], "locale_variants": {} }, { "sku": "KR35-PP", "brand": "FAG", "manufacturer_designation": "KR35-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.7, "static_load_kN": 14.5, "fatigue_load_limit_kN": 1.86, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 164, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 9.7 kN and C0 14.5 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.86 kN at 16 mm stud, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 3,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.19 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 164 g, or 0.09 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 16 mm stud shank the 52 mm width and 9.7 kN C rating suit high-cycle industrial machinery rather than instrument duty The caged pack keeps friction and inertia low — at 164 g this is the follower for fast indexing drives and high-cycle linkages Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 52 mm overall stud length The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 3,600 r/min limiting speed. Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 35 mm track diameter and 9.7 kN dynamic rating match the duty. In glass and ceramic line conveyors the threaded stud bolts directly to the frame, and in linear rail and profile track guidance the 164 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 52 mm stud length and the published 14.5 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KR35-PP?", "a": "The KR35-PP is a KR stud-type cam follower with needle roller and cage assembly with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 164 g." }, { "q": "What does the KR35-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR35-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×35×52 mm and the catalogue ratings are C 9.7 kN, C0 14.5 kN, Cur 1.86 kN." }, { "q": "What is the load capacity of the KR35-PP?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 14.5 kN; the fatigue load limit Cur is 1.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR35-PP?", "a": "HR1 lists a limiting speed of 3,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR35-PP fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR35", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR35-PP", "KR35-PP" ], "locale_variants": {} }, { "sku": "KRE35-PP", "brand": "FAG", "manufacturer_designation": "KRE35-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 9.7, "static_load_kN": 14.5, "fatigue_load_limit_kN": 1.86, "limiting_speed_rpm": 3600, "max_rpm": 3600, "weight_g": 177, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 9.7 kN and C0 14.5 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.86 kN at 16 mm stud, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 3,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.19 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 177 g, or 0.10 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam the 16 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately -PP protection suits cams and rails that are washed down or run in dust; exceeding the 3,600 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 35 mm track diameter and 9.7 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 177 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 52 mm stud length and the published 14.5 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KRE35-PP?", "a": "The KRE35-PP is a KRE stud-type cam follower with eccentric locking collar with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 177 g." }, { "q": "What does the KRE35-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE35-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×35×52 mm and the catalogue ratings are C 9.7 kN, C0 14.5 kN, Cur 1.86 kN." }, { "q": "What is the load capacity of the KRE35-PP?", "a": "The basic dynamic load rating C is 9.7 kN and the basic static load rating C0 is 14.5 kN; the fatigue load limit Cur is 1.86 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE35-PP?", "a": "HR1 lists a limiting speed of 3,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE35-PP fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE35", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE35-PP", "KRE35-PP" ], "locale_variants": {} }, { "sku": "KRV35-PP", "brand": "FAG", "manufacturer_designation": "KRV35-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 12.6, "static_load_kN": 23.4, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 1600, "max_rpm": 1600, "weight_g": 166, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 12.6 kN and C0 23.4 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.25 kN at 16 mm stud, equivalent to 0.79 kN of dynamic rating per millimetre — the limiting speed is 1,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.24 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 166 g, or 0.09 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam the 16 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 23.4 kN static rating and skews the outer ring KRV is the full-complement stud-type cam follower: a cageless needle pack maximises C0 23.4 kN inside the 35 mm outer ring on the 16 mm stud The PP seals make this a maintenance-free unit: the 12.6 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 35 mm track diameter and 12.6 kN dynamic rating match the duty. In automatic assembly machine carriages the threaded stud bolts directly to the frame, and in automotive welding jig rollers the 166 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 52 mm stud length and the published 23.4 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 52 mm stud unusable.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 52 mm stud unusable.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the KRV35-PP?", "a": "The KRV35-PP is a KRV full-complement stud-type cam follower with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 166 g." }, { "q": "What does the KRV35-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV35-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×35×52 mm and the catalogue ratings are C 12.6 kN, C0 23.4 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the KRV35-PP?", "a": "The basic dynamic load rating C is 12.6 kN and the basic static load rating C0 is 23.4 kN; the fatigue load limit Cur is 3.25 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV35-PP?", "a": "HR1 lists a limiting speed of 1,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV35-PP fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV35", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV35-PP", "KRV35-PP" ], "locale_variants": {} }, { "sku": "KR40", "brand": "FAG", "manufacturer_designation": "KR40", "series": "kr-series", "type": "cam_follower", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.9, "static_load_kN": 16, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 247, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 10.9 kN and C0 16 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.13 kN at 18 mm stud, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 2,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.19 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 247 g, or 0.11 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam the 18 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The caged pack keeps friction and inertia low — at 247 g this is the follower for fast indexing drives and high-cycle linkages Reading KR/KRV/KRE: stud-type needle cam followers in the open execution and a 58 mm overall stud length Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 40 mm track diameter and 10.9 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 247 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 58 mm stud length and the published 16 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KR40?", "a": "The KR40 is a KR stud-type cam follower with needle roller and cage assembly with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 247 g." }, { "q": "What does the KR40 designation mean in the FAG/INA HR1 catalogue?", "a": "KR40 identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 18×40×58 mm and the catalogue ratings are C 10.9 kN, C0 16 kN, Cur 2.13 kN." }, { "q": "What is the load capacity of the KR40?", "a": "The basic dynamic load rating C is 10.9 kN and the basic static load rating C0 is 16 kN; the fatigue load limit Cur is 2.13 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR40?", "a": "HR1 lists a limiting speed of 2,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR40 fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR40-PP", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR40", "KR40" ], "locale_variants": {} }, { "sku": "KR40-PP", "brand": "FAG", "manufacturer_designation": "KR40-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.9, "static_load_kN": 16, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 239, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 10.9 kN and C0 16 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.13 kN at 18 mm stud, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 2,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.19 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 239 g, or 0.10 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam the 18 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 16 kN static rating and skews the outer ring C 10.9 kN, C0 16 kN and Cur 2.13 kN are the cam-contact ratings; the limiting speed is 2,900 r/min with no reference speed published -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 58 mm width. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 40 mm track diameter and 10.9 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 239 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 58 mm stud length and the published 16 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the KR40-PP?", "a": "The KR40-PP is a KR stud-type cam follower with needle roller and cage assembly with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 239 g." }, { "q": "What does the KR40-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR40-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 18×40×58 mm and the catalogue ratings are C 10.9 kN, C0 16 kN, Cur 2.13 kN." }, { "q": "What is the load capacity of the KR40-PP?", "a": "The basic dynamic load rating C is 10.9 kN and the basic static load rating C0 is 16 kN; the fatigue load limit Cur is 2.13 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR40-PP?", "a": "HR1 lists a limiting speed of 2,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR40-PP fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR40", "equiv_brand": "FAG", "level": "partial", "note": "Same envelope and mounting; open vs -PP sealed execution — the three-stage seal excludes contamination at the cost of a small drag torque and lower limiting speed." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR40-PP", "KR40-PP" ], "locale_variants": {} }, { "sku": "KRE40-PP", "brand": "FAG", "manufacturer_designation": "KRE40-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 10.9, "static_load_kN": 16, "fatigue_load_limit_kN": 2.13, "limiting_speed_rpm": 2900, "max_rpm": 2900, "weight_g": 255, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 10.9 kN and C0 16 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.13 kN at 18 mm stud, equivalent to 0.61 kN of dynamic rating per millimetre — the limiting speed is 2,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.19 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 255 g, or 0.11 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam at 18 mm stud shank this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range C 10.9 kN, C0 16 kN and Cur 2.13 kN are the cam-contact ratings; the limiting speed is 2,900 r/min with no reference speed published KR is the stud-type cam follower with a needle roller and cage assembly: the 18 mm threaded stud bolts into the bracket and the 40 mm crowned outer ring follows the cam -PP protection suits cams and rails that are washed down or run in dust; exceeding the 2,900 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 40 mm track diameter and 10.9 kN dynamic rating match the duty. In cam drives and indexing tables the threaded stud bolts directly to the frame, and in printing press sheet-transfer grippers the 255 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 58 mm stud length and the published 16 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KRE40-PP?", "a": "The KRE40-PP is a KRE stud-type cam follower with eccentric locking collar with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 255 g." }, { "q": "What does the KRE40-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE40-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 18×40×58 mm and the catalogue ratings are C 10.9 kN, C0 16 kN, Cur 2.13 kN." }, { "q": "What is the load capacity of the KRE40-PP?", "a": "The basic dynamic load rating C is 10.9 kN and the basic static load rating C0 is 16 kN; the fatigue load limit Cur is 2.13 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE40-PP?", "a": "HR1 lists a limiting speed of 2,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE40-PP fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE40", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE40-PP", "KRE40-PP" ], "locale_variants": {} }, { "sku": "KRV40-PP", "brand": "FAG", "manufacturer_designation": "KRV40-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 14.7, "static_load_kN": 27, "fatigue_load_limit_kN": 3.55, "limiting_speed_rpm": 1400, "max_rpm": 1400, "weight_g": 247, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 14.7 kN and C0 27 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.55 kN at 18 mm stud, equivalent to 0.82 kN of dynamic rating per millimetre — the limiting speed is 1,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.25 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 247 g, or 0.11 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam the 18 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload KRV is the full-complement stud-type cam follower: a cageless needle pack maximises C0 27 kN inside the 40 mm outer ring on the 18 mm stud -PP protection suits cams and rails that are washed down or run in dust; exceeding the 1,400 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 40 mm track diameter and 14.7 kN dynamic rating match the duty. In cam drives and indexing tables the threaded stud bolts directly to the frame, and in printing press sheet-transfer grippers the 247 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 58 mm stud length and the published 27 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the KRV40-PP?", "a": "The KRV40-PP is a KRV full-complement stud-type cam follower with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 247 g." }, { "q": "What does the KRV40-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV40-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 18×40×58 mm and the catalogue ratings are C 14.7 kN, C0 27 kN, Cur 3.55 kN." }, { "q": "What is the load capacity of the KRV40-PP?", "a": "The basic dynamic load rating C is 14.7 kN and the basic static load rating C0 is 27 kN; the fatigue load limit Cur is 3.55 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV40-PP?", "a": "HR1 lists a limiting speed of 1,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV40-PP fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV40", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV40-PP", "KRV40-PP" ], "locale_variants": {} }, { "sku": "KR47-PP", "brand": "FAG", "manufacturer_designation": "KR47-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 20, "D_mm": 47, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.4, "static_load_kN": 26, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 381, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 20×47×66 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 15.4 kN and C0 26 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.45 kN at 20 mm stud, equivalent to 0.77 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.23 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 381 g, or 0.12 g per mm² of the 47×66 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 20 mm stud shank the 66 mm width and 15.4 kN C rating suit high-cycle industrial machinery rather than instrument duty KR is the stud-type cam follower with a needle roller and cage assembly: the 20 mm threaded stud bolts into the bracket and the 47 mm crowned outer ring follows the cam The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload The PP seals make this a maintenance-free unit: the 15.4 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 47 mm track diameter and 15.4 kN dynamic rating match the duty. In glass and ceramic line conveyors the threaded stud bolts directly to the frame, and in linear rail and profile track guidance the 381 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 66 mm stud length and the published 26 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the KR47-PP?", "a": "The KR47-PP is a KR stud-type cam follower with needle roller and cage assembly with 47 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×47×66 mm. Mass is 381 g." }, { "q": "What does the KR47-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR47-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×66 mm and the catalogue ratings are C 15.4 kN, C0 26 kN, Cur 3.45 kN." }, { "q": "What is the load capacity of the KR47-PP?", "a": "The basic dynamic load rating C is 15.4 kN and the basic static load rating C0 is 26 kN; the fatigue load limit Cur is 3.45 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR47-PP?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR47-PP fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 47 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR47", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR47-PP", "KR47-PP" ], "locale_variants": {} }, { "sku": "KRE47-PP", "brand": "FAG", "manufacturer_designation": "KRE47-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 20, "D_mm": 47, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.4, "static_load_kN": 26, "fatigue_load_limit_kN": 3.45, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 20×47×66 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 15.4 kN and C0 26 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.59 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.45 kN at 20 mm stud, equivalent to 0.77 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.23 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 400 g, or 0.13 g per mm² of the 47×66 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty KR is the stud-type cam follower with a needle roller and cage assembly: the 20 mm threaded stud bolts into the bracket and the 47 mm crowned outer ring follows the cam Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 66 mm overall stud length Reading -PP: rubbing seals at each face of the 47 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 47 mm track diameter and 15.4 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 400 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 66 mm stud length and the published 26 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KRE47-PP?", "a": "The KRE47-PP is a KRE stud-type cam follower with eccentric locking collar with 47 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×47×66 mm. Mass is 400 g." }, { "q": "What does the KRE47-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE47-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×66 mm and the catalogue ratings are C 15.4 kN, C0 26 kN, Cur 3.45 kN." }, { "q": "What is the load capacity of the KRE47-PP?", "a": "The basic dynamic load rating C is 15.4 kN and the basic static load rating C0 is 26 kN; the fatigue load limit Cur is 3.45 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE47-PP?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE47-PP fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 47 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE47", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE47-PP", "KRE47-PP" ], "locale_variants": {} }, { "sku": "KRV47-PP", "brand": "FAG", "manufacturer_designation": "KRV47-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 20, "D_mm": 47, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 20.3, "static_load_kN": 42.5, "fatigue_load_limit_kN": 6, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 20×47×66 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 20.3 kN and C0 42.5 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.48 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6 kN at 20 mm stud, equivalent to 1.02 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.31 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 390 g, or 0.13 g per mm² of the 47×66 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 20 mm stud shank the 66 mm width and 20.3 kN C rating suit high-cycle industrial machinery rather than instrument duty The full complement raises static capacity but lowers the speed ceiling and generates more friction torque — slow, heavily loaded cams are its duty C 20.3 kN, C0 42.5 kN and Cur 6 kN are the cam-contact ratings; the limiting speed is 1,300 r/min with no reference speed published -PP protection suits cams and rails that are washed down or run in dust; exceeding the 1,300 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 47 mm track diameter and 20.3 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 390 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 66 mm stud length and the published 42.5 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the KRV47-PP?", "a": "The KRV47-PP is a KRV full-complement stud-type cam follower with 47 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×47×66 mm. Mass is 390 g." }, { "q": "What does the KRV47-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV47-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×66 mm and the catalogue ratings are C 20.3 kN, C0 42.5 kN, Cur 6 kN." }, { "q": "What is the load capacity of the KRV47-PP?", "a": "The basic dynamic load rating C is 20.3 kN and the basic static load rating C0 is 42.5 kN; the fatigue load limit Cur is 6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV47-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV47-PP fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 47 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV47", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV47-PP", "KRV47-PP" ], "locale_variants": {} }, { "sku": "KR52-PP", "brand": "FAG", "manufacturer_designation": "KR52-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 20, "D_mm": 52, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.6, "static_load_kN": 29.5, "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 454, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 16.6 kN and C0 29.5 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.56 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.85 kN at 20 mm stud, equivalent to 0.83 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.25 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 454 g, or 0.13 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 29.5 kN static rating and skews the outer ring The PP seals make this a maintenance-free unit: the 16.6 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 52 mm track diameter and 16.6 kN dynamic rating match the duty. In automatic assembly machine carriages the threaded stud bolts directly to the frame, and in automotive welding jig rollers the 454 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 66 mm stud length and the published 29.5 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KR52-PP?", "a": "The KR52-PP is a KR stud-type cam follower with needle roller and cage assembly with 52 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×52×66 mm. Mass is 454 g." }, { "q": "What does the KR52-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR52-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×52×66 mm and the catalogue ratings are C 16.6 kN, C0 29.5 kN, Cur 3.85 kN." }, { "q": "What is the load capacity of the KR52-PP?", "a": "The basic dynamic load rating C is 16.6 kN and the basic static load rating C0 is 29.5 kN; the fatigue load limit Cur is 3.85 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR52-PP?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR52-PP fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 52 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR52", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR52-PP", "KR52-PP" ], "locale_variants": {} }, { "sku": "KRE52-PP", "brand": "FAG", "manufacturer_designation": "KRE52-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 20, "D_mm": 52, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 16.6, "static_load_kN": 29.5, "fatigue_load_limit_kN": 3.85, "limiting_speed_rpm": 2400, "max_rpm": 2400, "weight_g": 473, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 16.6 kN and C0 29.5 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.56 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.85 kN at 20 mm stud, equivalent to 0.83 kN of dynamic rating per millimetre — the limiting speed is 2,400 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.25 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 473 g, or 0.14 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 66 mm overall stud length The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately -PP protection suits cams and rails that are washed down or run in dust; exceeding the 2,400 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 52 mm track diameter and 16.6 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 473 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 66 mm stud length and the published 29.5 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KRE52-PP?", "a": "The KRE52-PP is a KRE stud-type cam follower with eccentric locking collar with 52 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×52×66 mm. Mass is 473 g." }, { "q": "What does the KRE52-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE52-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×52×66 mm and the catalogue ratings are C 16.6 kN, C0 29.5 kN, Cur 3.85 kN." }, { "q": "What is the load capacity of the KRE52-PP?", "a": "The basic dynamic load rating C is 16.6 kN and the basic static load rating C0 is 29.5 kN; the fatigue load limit Cur is 3.85 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE52-PP?", "a": "HR1 lists a limiting speed of 2,400 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE52-PP fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 52 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE52", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE52-PP", "KRE52-PP" ], "locale_variants": {} }, { "sku": "KRV52-PP", "brand": "FAG", "manufacturer_designation": "KRV52-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 20, "D_mm": 52, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 22.3, "static_load_kN": 48.5, "fatigue_load_limit_kN": 6.8, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 463, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 22.3 kN and C0 48.5 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.46 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 6.8 kN at 20 mm stud, equivalent to 1.11 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.34 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 463 g, or 0.13 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty C 22.3 kN, C0 48.5 kN and Cur 6.8 kN are the cam-contact ratings; the limiting speed is 1,300 r/min with no reference speed published Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 66 mm overall stud length Reading -PP: rubbing seals at each face of the 52 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 52 mm track diameter and 22.3 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 463 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 66 mm stud length and the published 48.5 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the KRV52-PP?", "a": "The KRV52-PP is a KRV full-complement stud-type cam follower with 52 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×52×66 mm. Mass is 463 g." }, { "q": "What does the KRV52-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV52-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×52×66 mm and the catalogue ratings are C 22.3 kN, C0 48.5 kN, Cur 6.8 kN." }, { "q": "What is the load capacity of the KRV52-PP?", "a": "The basic dynamic load rating C is 22.3 kN and the basic static load rating C0 is 48.5 kN; the fatigue load limit Cur is 6.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV52-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV52-PP fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 52 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV52", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV52-PP", "KRV52-PP" ], "locale_variants": {} }, { "sku": "KR62-PP", "brand": "FAG", "manufacturer_designation": "KR62-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 24, "D_mm": 62, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 48.5, "fatigue_load_limit_kN": 7, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 24×62×80 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 26 kN and C0 48.5 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 19.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7 kN at 24 mm stud, equivalent to 1.08 kN of dynamic rating per millimetre — the limiting speed is 1,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.33 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 770 g, or 0.16 g per mm² of the 62×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately C 26 kN, C0 48.5 kN and Cur 7 kN are the cam-contact ratings; the limiting speed is 1,900 r/min with no reference speed published The PP seals make this a maintenance-free unit: the 26 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 62 mm track diameter and 26 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 770 g mass keeps follower kinetics light. Designers also specify it for glass and ceramic line conveyors, relying on the 80 mm stud length and the published 48.5 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the KR62-PP?", "a": "The KR62-PP is a KR stud-type cam follower with needle roller and cage assembly with 62 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×62×80 mm. Mass is 770 g." }, { "q": "What does the KR62-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR62-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×62×80 mm and the catalogue ratings are C 26 kN, C0 48.5 kN, Cur 7 kN." }, { "q": "What is the load capacity of the KR62-PP?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 48.5 kN; the fatigue load limit Cur is 7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR62-PP?", "a": "HR1 lists a limiting speed of 1,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR62-PP fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 62 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR62", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR62-PP", "KR62-PP" ], "locale_variants": {} }, { "sku": "KRE62-PP", "brand": "FAG", "manufacturer_designation": "KRE62-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 24, "D_mm": 62, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 26, "static_load_kN": 48.5, "fatigue_load_limit_kN": 7, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 789, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 24×62×80 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 26 kN and C0 48.5 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.54 reflects a rolling-element pack sized for heavy static track loading, and the 19.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7 kN at 24 mm stud, equivalent to 1.08 kN of dynamic rating per millimetre — the limiting speed is 1,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.33 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 789 g, or 0.16 g per mm² of the 62×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty C 26 kN, C0 48.5 kN and Cur 7 kN are the cam-contact ratings; the limiting speed is 1,900 r/min with no reference speed published -PP protection suits cams and rails that are washed down or run in dust; exceeding the 1,900 r/min speed ceiling overheats the lips rather than just accelerating wear. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 62 mm track diameter and 26 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 789 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 80 mm stud length and the published 48.5 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the KRE62-PP?", "a": "The KRE62-PP is a KRE stud-type cam follower with eccentric locking collar with 62 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×62×80 mm. Mass is 789 g." }, { "q": "What does the KRE62-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE62-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×62×80 mm and the catalogue ratings are C 26 kN, C0 48.5 kN, Cur 7 kN." }, { "q": "What is the load capacity of the KRE62-PP?", "a": "The basic dynamic load rating C is 26 kN and the basic static load rating C0 is 48.5 kN; the fatigue load limit Cur is 7 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE62-PP?", "a": "HR1 lists a limiting speed of 1,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE62-PP fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 62 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE62", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE62-PP", "KRE62-PP" ], "locale_variants": {} }, { "sku": "KRV62-PP", "brand": "FAG", "manufacturer_designation": "KRV62-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 24, "D_mm": 62, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 33.5, "static_load_kN": 76, "fatigue_load_limit_kN": 11.4, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 787, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 24×62×80 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 33.5 kN and C0 76 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.44 reflects a rolling-element pack sized for heavy static track loading, and the 19.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.4 kN at 24 mm stud, equivalent to 1.40 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.42 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 787 g, or 0.16 g per mm² of the 62×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The full complement raises static capacity but lowers the speed ceiling and generates more friction torque — slow, heavily loaded cams are its duty The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 76 kN static rating and skews the outer ring -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 80 mm width. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 62 mm track diameter and 33.5 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 787 g mass keeps follower kinetics light. Designers also specify it for automotive welding jig rollers, relying on the 80 mm stud length and the published 76 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 80 mm stud unusable.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 80 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the KRV62-PP?", "a": "The KRV62-PP is a KRV full-complement stud-type cam follower with 62 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×62×80 mm. Mass is 787 g." }, { "q": "What does the KRV62-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV62-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×62×80 mm and the catalogue ratings are C 33.5 kN, C0 76 kN, Cur 11.4 kN." }, { "q": "What is the load capacity of the KRV62-PP?", "a": "The basic dynamic load rating C is 33.5 kN and the basic static load rating C0 is 76 kN; the fatigue load limit Cur is 11.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV62-PP?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV62-PP fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 62 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV62", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV62-PP", "KRV62-PP" ], "locale_variants": {} }, { "sku": "KR72-PP", "brand": "FAG", "manufacturer_designation": "KR72-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 24, "D_mm": 72, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28, "static_load_kN": 53, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 1010, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 28 kN and C0 53 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.53 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.3 kN at 24 mm stud, equivalent to 1.17 kN of dynamic rating per millimetre — the limiting speed is 1,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.35 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.01 kg (1010 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 80 mm overall stud length KR is the stud-type cam follower with a needle roller and cage assembly: the 24 mm threaded stud bolts into the bracket and the 72 mm crowned outer ring follows the cam -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 80 mm width. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 72 mm track diameter and 28 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 1.01 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural and textile cam followers, relying on the 80 mm stud length and the published 53 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the KR72-PP?", "a": "The KR72-PP is a KR stud-type cam follower with needle roller and cage assembly with 72 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×72×80 mm. Mass is 1.01 kg." }, { "q": "What does the KR72-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR72-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×72×80 mm and the catalogue ratings are C 28 kN, C0 53 kN, Cur 7.3 kN." }, { "q": "What is the load capacity of the KR72-PP?", "a": "The basic dynamic load rating C is 28 kN and the basic static load rating C0 is 53 kN; the fatigue load limit Cur is 7.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR72-PP?", "a": "HR1 lists a limiting speed of 1,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR72-PP fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 72 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR72", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR72-PP", "KR72-PP" ], "locale_variants": {} }, { "sku": "KRE72-PP", "brand": "FAG", "manufacturer_designation": "KRE72-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 24, "D_mm": 72, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 28, "static_load_kN": 53, "fatigue_load_limit_kN": 7.3, "limiting_speed_rpm": 1900, "max_rpm": 1900, "weight_g": 1038, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 28 kN and C0 53 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.53 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.3 kN at 24 mm stud, equivalent to 1.17 kN of dynamic rating per millimetre — the limiting speed is 1,900 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.35 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.038 kg (1038 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam at 24 mm stud shank this size balances the 72 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The caged pack keeps friction and inertia low — at 1038 g this is the follower for fast indexing drives and high-cycle linkages The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 80 mm width. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 72 mm track diameter and 28 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 1.038 kg mass is part of the rotor inertia calculation. Designers also specify it for cam drives and indexing tables, relying on the 80 mm stud length and the published 53 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KRE72-PP?", "a": "The KRE72-PP is a KRE stud-type cam follower with eccentric locking collar with 72 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×72×80 mm. Mass is 1.038 kg." }, { "q": "What does the KRE72-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE72-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×72×80 mm and the catalogue ratings are C 28 kN, C0 53 kN, Cur 7.3 kN." }, { "q": "What is the load capacity of the KRE72-PP?", "a": "The basic dynamic load rating C is 28 kN and the basic static load rating C0 is 53 kN; the fatigue load limit Cur is 7.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE72-PP?", "a": "HR1 lists a limiting speed of 1,900 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE72-PP fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 72 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE72", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE72-PP", "KRE72-PP" ], "locale_variants": {} }, { "sku": "KRV72-PP", "brand": "FAG", "manufacturer_designation": "KRV72-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 24, "D_mm": 72, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 36.5, "static_load_kN": 86, "fatigue_load_limit_kN": 12.8, "limiting_speed_rpm": 1100, "max_rpm": 1100, "weight_g": 1027, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 36.5 kN and C0 86 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.42 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 12.8 kN at 24 mm stud, equivalent to 1.52 kN of dynamic rating per millimetre — the limiting speed is 1,100 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.46 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.027 kg (1027 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 86 kN static rating and skews the outer ring -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 80 mm width. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 72 mm track diameter and 36.5 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 1.027 kg mass is part of the rotor inertia calculation. Designers also specify it for cam drives and indexing tables, relying on the 80 mm stud length and the published 86 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 80 mm stud unusable.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 80 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the KRV72-PP?", "a": "The KRV72-PP is a KRV full-complement stud-type cam follower with 72 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×72×80 mm. Mass is 1.027 kg." }, { "q": "What does the KRV72-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV72-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×72×80 mm and the catalogue ratings are C 36.5 kN, C0 86 kN, Cur 12.8 kN." }, { "q": "What is the load capacity of the KRV72-PP?", "a": "The basic dynamic load rating C is 36.5 kN and the basic static load rating C0 is 86 kN; the fatigue load limit Cur is 12.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV72-PP?", "a": "HR1 lists a limiting speed of 1,100 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV72-PP fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 72 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV72", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV72-PP", "KRV72-PP" ], "locale_variants": {} }, { "sku": "KR80-PP", "brand": "FAG", "manufacturer_designation": "KR80-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 30, "D_mm": 80, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38.5, "static_load_kN": 78, "fatigue_load_limit_kN": 11.2, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 1608, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 30×80×100 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 38.5 kN and C0 78 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.49 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.2 kN at 30 mm stud, equivalent to 1.28 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.39 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.608 kg (1608 g), or 0.20 g per mm² of the 80×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading KR/KRV/KRE: stud-type needle cam followers with PP lip seals on both sides and a 100 mm overall stud length The PP seals make this a maintenance-free unit: the 38.5 kN C rating is slightly below the open execution because the seal recesses shorten the effective roller complement. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 80 mm track diameter and 38.5 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 1.608 kg mass is part of the rotor inertia calculation. Designers also specify it for glass and ceramic line conveyors, relying on the 100 mm stud length and the published 78 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KR80-PP?", "a": "The KR80-PP is a KR stud-type cam follower with needle roller and cage assembly with 80 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×80×100 mm. Mass is 1.608 kg." }, { "q": "What does the KR80-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR80-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×80×100 mm and the catalogue ratings are C 38.5 kN, C0 78 kN, Cur 11.2 kN." }, { "q": "What is the load capacity of the KR80-PP?", "a": "The basic dynamic load rating C is 38.5 kN and the basic static load rating C0 is 78 kN; the fatigue load limit Cur is 11.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR80-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR80-PP fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 80 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR80", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR80-PP", "KR80-PP" ], "locale_variants": {} }, { "sku": "KRE80-PP", "brand": "FAG", "manufacturer_designation": "KRE80-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 30, "D_mm": 80, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 38.5, "static_load_kN": 78, "fatigue_load_limit_kN": 11.2, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 1665, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 30×80×100 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 38.5 kN and C0 78 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.49 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.2 kN at 30 mm stud, equivalent to 1.28 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.39 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.665 kg (1665 g), or 0.21 g per mm² of the 80×100 mm track envelope — inertia that the drive must accelerate on every index of the cam at 30 mm stud shank this size balances the 80 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range C 38.5 kN, C0 78 kN and Cur 11.2 kN are the cam-contact ratings; the limiting speed is 1,300 r/min with no reference speed published The crowned outer-ring profile is the standard form: it distributes edge stress when the cam track is not perfectly parallel, and a cylindrical-profile variant would be ordered separately Reading -PP: rubbing seals at each face of the 80 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 80 mm track diameter and 38.5 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 1.665 kg mass is part of the rotor inertia calculation. Designers also specify it for automotive welding jig rollers, relying on the 100 mm stud length and the published 78 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the KRE80-PP?", "a": "The KRE80-PP is a KRE stud-type cam follower with eccentric locking collar with 80 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×80×100 mm. Mass is 1.665 kg." }, { "q": "What does the KRE80-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE80-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×80×100 mm and the catalogue ratings are C 38.5 kN, C0 78 kN, Cur 11.2 kN." }, { "q": "What is the load capacity of the KRE80-PP?", "a": "The basic dynamic load rating C is 38.5 kN and the basic static load rating C0 is 78 kN; the fatigue load limit Cur is 11.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE80-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE80-PP fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 80 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE80", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE80-PP", "KRE80-PP" ], "locale_variants": {} }, { "sku": "KRV80-PP", "brand": "FAG", "manufacturer_designation": "KRV80-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 30, "D_mm": 80, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 48.5, "static_load_kN": 118, "fatigue_load_limit_kN": 17.6, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 1636, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 30×80×100 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 48.5 kN and C0 118 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.41 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 17.6 kN at 30 mm stud, equivalent to 1.62 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.48 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.636 kg (1636 g), or 0.20 g per mm² of the 80×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The full complement raises static capacity but lowers the speed ceiling and generates more friction torque — slow, heavily loaded cams are its duty The standard stud axis fixes the roller centre; shimming the bracket faces is the way to adjust track preload -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 100 mm width. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 80 mm track diameter and 48.5 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 1.636 kg mass is part of the rotor inertia calculation. Designers also specify it for automotive welding jig rollers, relying on the 100 mm stud length and the published 118 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the KRV80-PP?", "a": "The KRV80-PP is a KRV full-complement stud-type cam follower with 80 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×80×100 mm. Mass is 1.636 kg." }, { "q": "What does the KRV80-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV80-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×80×100 mm and the catalogue ratings are C 48.5 kN, C0 118 kN, Cur 17.6 kN." }, { "q": "What is the load capacity of the KRV80-PP?", "a": "The basic dynamic load rating C is 48.5 kN and the basic static load rating C0 is 118 kN; the fatigue load limit Cur is 17.6 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV80-PP?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV80-PP fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 80 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV80", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV80-PP", "KRV80-PP" ], "locale_variants": {} }, { "sku": "KR90-PP", "brand": "FAG", "manufacturer_designation": "KR90-PP", "series": "kr-series", "type": "cam_follower", "d_mm": 30, "D_mm": 90, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 40.5, "static_load_kN": 84, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 1975, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 40.5 kN and C0 84 kN for the KR stud-type cam follower with needle roller and cage assembly; the C/C0 ratio of 0.48 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.9 kN at 30 mm stud, equivalent to 1.35 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.41 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.975 kg (1975 g), or 0.22 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty KR is the stud-type cam follower with a needle roller and cage assembly: the 30 mm threaded stud bolts into the bracket and the 90 mm crowned outer ring follows the cam The stud must be fully supported and torqued against a flat bracket face; an under-supported cantilever stud bends under the 84 kN static rating and skews the outer ring The -PP suffix fits contact lip seals on both sides, retaining the factory grease and excluding water and dust; seal friction is reflected in the 1,300 r/min limiting speed. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 90 mm track diameter and 40.5 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 1.975 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural and textile cam followers, relying on the 100 mm stud length and the published 84 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the KR90-PP?", "a": "The KR90-PP is a KR stud-type cam follower with needle roller and cage assembly with 90 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×90×100 mm. Mass is 1.975 kg." }, { "q": "What does the KR90-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KR90-PP identifies this KR stud-type cam follower with needle roller and cage assembly in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×90×100 mm and the catalogue ratings are C 40.5 kN, C0 84 kN, Cur 11.9 kN." }, { "q": "What is the load capacity of the KR90-PP?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 84 kN; the fatigue load limit Cur is 11.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KR90-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KR90-PP fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 90 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KR90", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KR90-PP", "KR90-PP" ], "locale_variants": {} }, { "sku": "KRE90-PP", "brand": "FAG", "manufacturer_designation": "KRE90-PP", "series": "kre-series", "type": "cam_follower", "d_mm": 30, "D_mm": 90, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 40.5, "static_load_kN": 84, "fatigue_load_limit_kN": 11.9, "limiting_speed_rpm": 1300, "max_rpm": 1300, "weight_g": 2032, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 40.5 kN and C0 84 kN for the KRE stud-type cam follower with eccentric locking collar; the C/C0 ratio of 0.48 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 11.9 kN at 30 mm stud, equivalent to 1.35 kN of dynamic rating per millimetre — the limiting speed is 1,300 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.41 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 2.032 kg (2032 g), or 0.23 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam at 30 mm stud shank this size balances the 90 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range KR is the stud-type cam follower with a needle roller and cage assembly: the 30 mm threaded stud bolts into the bracket and the 90 mm crowned outer ring follows the cam C 40.5 kN, C0 84 kN and Cur 11.9 kN are the cam-contact ratings; the limiting speed is 1,300 r/min with no reference speed published -PP means sealed both sides with elastomer lips — the roller is greased for life and needs no relubrication fitting in the 100 mm width. Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 90 mm track diameter and 40.5 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 2.032 kg mass is part of the rotor inertia calculation. Designers also specify it for automatic assembly machine carriages, relying on the 100 mm stud length and the published 84 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the KRE90-PP?", "a": "The KRE90-PP is a KRE stud-type cam follower with eccentric locking collar with 90 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×90×100 mm. Mass is 2.032 kg." }, { "q": "What does the KRE90-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRE90-PP identifies this KRE stud-type cam follower with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×90×100 mm and the catalogue ratings are C 40.5 kN, C0 84 kN, Cur 11.9 kN." }, { "q": "What is the load capacity of the KRE90-PP?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 84 kN; the fatigue load limit Cur is 11.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRE90-PP?", "a": "HR1 lists a limiting speed of 1,300 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRE90-PP fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 90 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRE90", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRE90-PP", "KRE90-PP" ], "locale_variants": {} }, { "sku": "KRV90-PP", "brand": "FAG", "manufacturer_designation": "KRV90-PP", "series": "krv-series", "type": "cam_follower", "d_mm": 30, "D_mm": 90, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 52, "static_load_kN": 130, "fatigue_load_limit_kN": 19.4, "limiting_speed_rpm": 850, "max_rpm": 850, "weight_g": 2003, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 7063", "naming_rule_text": "envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 52 kN and C0 130 kN for the KRV full-complement stud-type cam follower; the C/C0 ratio of 0.40 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 19.4 kN at 30 mm stud, equivalent to 1.73 kN of dynamic rating per millimetre — the limiting speed is 850 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.52 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 2.003 kg (2003 g), or 0.22 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The full complement raises static capacity but lowers the speed ceiling and generates more friction torque — slow, heavily loaded cams are its duty KRV is the full-complement stud-type cam follower: a cageless needle pack maximises C0 130 kN inside the 90 mm outer ring on the 30 mm stud Reading -PP: rubbing seals at each face of the 90 mm outer ring; they protect the rolling-element pack in abrasive track environments at the cost of a small drag torque. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 90 mm track diameter and 52 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 2.003 kg mass is part of the rotor inertia calculation. Designers also specify it for cam drives and indexing tables, relying on the 100 mm stud length and the published 130 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the KRV90-PP?", "a": "The KRV90-PP is a KRV full-complement stud-type cam follower with 90 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×90×100 mm. Mass is 2.003 kg." }, { "q": "What does the KRV90-PP designation mean in the FAG/INA HR1 catalogue?", "a": "KRV90-PP identifies this KRV full-complement stud-type cam follower in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×90×100 mm and the catalogue ratings are C 52 kN, C0 130 kN, Cur 19.4 kN." }, { "q": "What is the load capacity of the KRV90-PP?", "a": "The basic dynamic load rating C is 52 kN and the basic static load rating C0 is 130 kN; the fatigue load limit Cur is 19.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the KRV90-PP?", "a": "HR1 lists a limiting speed of 850 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the KRV90-PP fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 90 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "KRV90", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1457", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "KRV90-PP", "KRV90-PP" ], "locale_variants": {} }, { "sku": "NUKR35", "brand": "FAG", "manufacturer_designation": "NUKR35", "series": "nukr-series", "type": "support_roller", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 15.3, "static_load_kN": 19, "fatigue_load_limit_kN": 2.48, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 164, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 15.3 kN and C0 19 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.81 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.48 kN at 16 mm stud, equivalent to 0.96 kN of dynamic rating per millimetre — the limiting speed is 6,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.29 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 164 g, or 0.09 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam the 16 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, with labyrinth-style protection at the faces The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 164 g roller runs without cantilever bending Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 35 mm track diameter and 15.3 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 164 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 52 mm stud length and the published 19 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 52 mm stud unusable. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 52 mm stud unusable.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the NUKR35?", "a": "The NUKR35 is a NUKR double-row full-complement stud-type track roller with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 164 g." }, { "q": "What does the NUKR35 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR35 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×35×52 mm and the catalogue ratings are C 15.3 kN, C0 19 kN, Cur 2.48 kN." }, { "q": "What is the load capacity of the NUKR35?", "a": "The basic dynamic load rating C is 15.3 kN and the basic static load rating C0 is 19 kN; the fatigue load limit Cur is 2.48 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR35?", "a": "HR1 lists a limiting speed of 6,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR35 fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR35", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR35", "NUKR35" ], "locale_variants": {} }, { "sku": "NUKRE35", "brand": "FAG", "manufacturer_designation": "NUKRE35", "series": "nukre-series", "type": "support_roller", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 15.3, "static_load_kN": 19, "fatigue_load_limit_kN": 2.48, "limiting_speed_rpm": 6500, "max_rpm": 6500, "weight_g": 177, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 15.3 kN and C0 19 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.81 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.48 kN at 16 mm stud, equivalent to 0.96 kN of dynamic rating per millimetre — the limiting speed is 6,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.29 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 177 g, or 0.10 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 16 mm stud shank the 52 mm width and 15.3 kN C rating suit high-cycle industrial machinery rather than instrument duty The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 177 g roller runs without cantilever bending NUKRE is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket Typical applications include cam drives and indexing tables, printing press sheet-transfer grippers and woodworking machine feed tracks, where the 35 mm track diameter and 15.3 kN dynamic rating match the duty. In cam drives and indexing tables the threaded stud bolts directly to the frame, and in printing press sheet-transfer grippers the 177 g mass keeps follower kinetics light. Designers also specify it for woodworking machine feed tracks, relying on the 52 mm stud length and the published 19 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 52 mm stud unusable. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 52 mm stud unusable.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the NUKRE35?", "a": "The NUKRE35 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 177 g." }, { "q": "What does the NUKRE35 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE35 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 16×35×52 mm and the catalogue ratings are C 15.3 kN, C0 19 kN, Cur 2.48 kN." }, { "q": "What is the load capacity of the NUKRE35?", "a": "The basic dynamic load rating C is 15.3 kN and the basic static load rating C0 is 19 kN; the fatigue load limit Cur is 2.48 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE35?", "a": "HR1 lists a limiting speed of 6,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE35 fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE35", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE35", "NUKRE35" ], "locale_variants": {} }, { "sku": "PWKR35-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR35-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 12.6, "static_load_kN": 14.9, "fatigue_load_limit_kN": 1.79, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 164, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 12.6 kN and C0 14.9 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.85 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.79 kN at 16 mm stud, equivalent to 0.79 kN of dynamic rating per millimetre — the limiting speed is 6,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.24 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 164 g, or 0.09 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 16 mm stud shank the 52 mm width and 12.6 kN C rating suit high-cycle industrial machinery rather than instrument duty The 16 mm stud clamps into the machine frame with its nut and washer while the 35 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 52 mm Two cageless roller rows deliver C 12.6 kN and C0 14.9 kN, 0.79 kN of dynamic rating per millimetre of stud — the heaviest track-roller ratings in the HR1 range -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 12.6 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 35 mm outer ring. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 35 mm track diameter and 12.6 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 164 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 52 mm stud length and the published 14.9 kN static rating. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the PWKR35-2RS-XL?", "a": "The PWKR35-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 164 g." }, { "q": "What does the PWKR35-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR35-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×35×52 mm and the catalogue ratings are C 12.6 kN, C0 14.9 kN, Cur 1.79 kN." }, { "q": "What is the load capacity of the PWKR35-2RS-XL?", "a": "The basic dynamic load rating C is 12.6 kN and the basic static load rating C0 is 14.9 kN; the fatigue load limit Cur is 1.79 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR35-2RS-XL?", "a": "HR1 lists a limiting speed of 6,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR35-2RS-XL fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR35", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR35-2RS-XL", "PWKR35-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE35-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE35-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 16, "D_mm": 35, "B_mm": 52, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 12.6, "static_load_kN": 14.9, "fatigue_load_limit_kN": 1.79, "limiting_speed_rpm": 6000, "max_rpm": 6000, "weight_g": 177, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 16×35×52 mm: the 35 mm outside diameter is the track-running surface — a thick-walled outer ring over a 16 mm stud — and the 52 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 12.6 kN and C0 14.9 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.85 reflects a rolling-element pack sized for heavy static track loading, and the 9.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 1.79 kN at 16 mm stud, equivalent to 0.79 kN of dynamic rating per millimetre — the limiting speed is 6,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 16 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.24 kN per millimetre of rolling-element complement within the 52 mm overall stud length mass is 177 g, or 0.10 g per mm² of the 35×52 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 16 mm stud shank the 52 mm width and 12.6 kN C rating suit high-cycle industrial machinery rather than instrument duty The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 6,000 r/min and no thermal reference speed is given for track rollers The 16 mm stud clamps into the machine frame with its nut and washer while the 35 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 52 mm -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 12.6 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 35 mm outer ring. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 35 mm track diameter and 12.6 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 177 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 52 mm stud length and the published 14.9 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the PWKRE35-2RS-XL?", "a": "The PWKRE35-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 35 mm outside diameter, 16 mm stud diameter and 52 mm overall length, envelope 16×35×52 mm. Mass is 177 g." }, { "q": "What does the PWKRE35-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE35-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 16×35×52 mm and the catalogue ratings are C 12.6 kN, C0 14.9 kN, Cur 1.79 kN." }, { "q": "What is the load capacity of the PWKRE35-2RS-XL?", "a": "The basic dynamic load rating C is 12.6 kN and the basic static load rating C0 is 14.9 kN; the fatigue load limit Cur is 1.79 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE35-2RS-XL?", "a": "HR1 lists a limiting speed of 6,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE35-2RS-XL fitted and adjusted?", "a": "The 16 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 35 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE35", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE35-2RS-XL", "PWKRE35-2RS-XL" ], "locale_variants": {} }, { "sku": "NUKR40", "brand": "FAG", "manufacturer_designation": "NUKR40", "series": "nukr-series", "type": "support_roller", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 18.8, "static_load_kN": 25.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 18.8 kN and C0 25.5 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.74 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.25 kN at 18 mm stud, equivalent to 1.04 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.32 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 242 g, or 0.10 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 18 mm stud shank the 58 mm width and 18.8 kN C rating suit high-cycle industrial machinery rather than instrument duty The 18 mm stud clamps into the machine frame with its nut and washer while the 40 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 58 mm Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, with labyrinth-style protection at the faces Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 40 mm track diameter and 18.8 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 242 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 58 mm stud length and the published 25.5 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the NUKR40?", "a": "The NUKR40 is a NUKR double-row full-complement stud-type track roller with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 242 g." }, { "q": "What does the NUKR40 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR40 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 18×40×58 mm and the catalogue ratings are C 18.8 kN, C0 25.5 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the NUKR40?", "a": "The basic dynamic load rating C is 18.8 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 3.25 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR40?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR40 fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR40", "NUKR40" ], "locale_variants": {} }, { "sku": "NUKRE40", "brand": "FAG", "manufacturer_designation": "NUKRE40", "series": "nukre-series", "type": "support_roller", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 18.8, "static_load_kN": 25.5, "fatigue_load_limit_kN": 3.25, "limiting_speed_rpm": 5500, "max_rpm": 5500, "weight_g": 258, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 18.8 kN and C0 25.5 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.74 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.25 kN at 18 mm stud, equivalent to 1.04 kN of dynamic rating per millimetre — the limiting speed is 5,500 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.32 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 258 g, or 0.11 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam at 18 mm stud shank this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 18 mm stud clamps into the machine frame with its nut and washer while the 40 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 58 mm Reading the designation: the trailing E marks the eccentric locking collar — turning the collar shifts the roller centre to take up clearance or preload against the track, with labyrinth-style protection at the faces Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 40 mm track diameter and 18.8 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 258 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 58 mm stud length and the published 25.5 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the NUKRE40?", "a": "The NUKRE40 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 258 g." }, { "q": "What does the NUKRE40 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE40 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 18×40×58 mm and the catalogue ratings are C 18.8 kN, C0 25.5 kN, Cur 3.25 kN." }, { "q": "What is the load capacity of the NUKRE40?", "a": "The basic dynamic load rating C is 18.8 kN and the basic static load rating C0 is 25.5 kN; the fatigue load limit Cur is 3.25 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE40?", "a": "HR1 lists a limiting speed of 5,500 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE40 fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE40", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE40", "NUKRE40" ], "locale_variants": {} }, { "sku": "PWKR40-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR40-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 14.3, "static_load_kN": 18.2, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 242, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 14.3 kN and C0 18.2 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.79 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.2 kN at 18 mm stud, equivalent to 0.79 kN of dynamic rating per millimetre — the limiting speed is 5,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.25 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 242 g, or 0.10 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam the 18 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Stud mounting puts all moment load into the bracket — torque the stud nut to the catalogue value, support the shank over its full length, and use the eccentric collar only for its small design adjustment range As an X-life (-XL) bearing it benefits from the optimised surface finish that reduces friction and raises the fatigue strength behind the 2.2 kN Cur value. 2RS means two side contact seals: the sealed roller excludes contamination without a separate shield arrangement, at the published limiting speed of 5,000 r/min. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 40 mm track diameter and 14.3 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 242 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 58 mm stud length and the published 18.2 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the PWKR40-2RS-XL?", "a": "The PWKR40-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 242 g." }, { "q": "What does the PWKR40-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR40-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 18×40×58 mm and the catalogue ratings are C 14.3 kN, C0 18.2 kN, Cur 2.2 kN." }, { "q": "What is the load capacity of the PWKR40-2RS-XL?", "a": "The basic dynamic load rating C is 14.3 kN and the basic static load rating C0 is 18.2 kN; the fatigue load limit Cur is 2.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR40-2RS-XL?", "a": "HR1 lists a limiting speed of 5,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR40-2RS-XL fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR40", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR40-2RS-XL", "PWKR40-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE40-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE40-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 18, "D_mm": 40, "B_mm": 58, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 14.3, "static_load_kN": 18.2, "fatigue_load_limit_kN": 2.2, "limiting_speed_rpm": 5000, "max_rpm": 5000, "weight_g": 258, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 18×40×58 mm: the 40 mm outside diameter is the track-running surface — a thick-walled outer ring over a 18 mm stud — and the 58 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 14.3 kN and C0 18.2 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.79 reflects a rolling-element pack sized for heavy static track loading, and the 11.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 2.2 kN at 18 mm stud, equivalent to 0.79 kN of dynamic rating per millimetre — the limiting speed is 5,000 r/min and, as for HR1 track rollers, no thermal reference speed is published the 18 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.25 kN per millimetre of rolling-element complement within the 58 mm overall stud length mass is 258 g, or 0.11 g per mm² of the 40×58 mm track envelope — inertia that the drive must accelerate on every index of the cam at 18 mm stud shank this size balances the 40 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 5,000 r/min and no thermal reference speed is given for track rollers Stud mounting puts all moment load into the bracket — torque the stud nut to the catalogue value, support the shank over its full length, and use the eccentric collar only for its small design adjustment range -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 14.3 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 40 mm outer ring. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 40 mm track diameter and 14.3 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 258 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 58 mm stud length and the published 18.2 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "printing press sheet-transfer grippers", "automotive welding jig rollers", "cam drives and indexing tables", "woodworking machine feed tracks" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 58 mm stud unusable.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the PWKRE40-2RS-XL?", "a": "The PWKRE40-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 40 mm outside diameter, 18 mm stud diameter and 58 mm overall length, envelope 18×40×58 mm. Mass is 258 g." }, { "q": "What does the PWKRE40-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE40-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 18×40×58 mm and the catalogue ratings are C 14.3 kN, C0 18.2 kN, Cur 2.2 kN." }, { "q": "What is the load capacity of the PWKRE40-2RS-XL?", "a": "The basic dynamic load rating C is 14.3 kN and the basic static load rating C0 is 18.2 kN; the fatigue load limit Cur is 2.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE40-2RS-XL?", "a": "HR1 lists a limiting speed of 5,000 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE40-2RS-XL fitted and adjusted?", "a": "The 18 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 40 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE40", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE40-2RS-XL", "PWKRE40-2RS-XL" ], "locale_variants": {} }, { "sku": "NUKR47", "brand": "FAG", "manufacturer_designation": "NUKR47", "series": "nukr-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 66, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 28.5, "static_load_kN": 38, "fatigue_load_limit_kN": 4.95, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×66 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 28.5 kN and C0 38 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.75 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.95 kN at 20 mm stud, equivalent to 1.43 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.43 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 380 g, or 0.12 g per mm² of the 47×66 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, with labyrinth-style protection at the faces The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 380 g roller runs without cantilever bending Typical applications include automotive welding jig rollers, conveyor transfer and diverting stations and automatic assembly machine carriages, where the 47 mm track diameter and 28.5 kN dynamic rating match the duty. In automotive welding jig rollers the threaded stud bolts directly to the frame, and in conveyor transfer and diverting stations the 380 g mass keeps follower kinetics light. Designers also specify it for automatic assembly machine carriages, relying on the 66 mm stud length and the published 38 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the NUKR47?", "a": "The NUKR47 is a NUKR double-row full-complement stud-type track roller with 47 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×47×66 mm. Mass is 380 g." }, { "q": "What does the NUKR47 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR47 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×66 mm and the catalogue ratings are C 28.5 kN, C0 38 kN, Cur 4.95 kN." }, { "q": "What is the load capacity of the NUKR47?", "a": "The basic dynamic load rating C is 28.5 kN and the basic static load rating C0 is 38 kN; the fatigue load limit Cur is 4.95 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR47?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR47 fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 47 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR47", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR47", "NUKR47" ], "locale_variants": {} }, { "sku": "NUKRE47", "brand": "FAG", "manufacturer_designation": "NUKRE47", "series": "nukre-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 66, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 28.5, "static_load_kN": 38, "fatigue_load_limit_kN": 4.95, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×66 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 28.5 kN and C0 38 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.75 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.95 kN at 20 mm stud, equivalent to 1.43 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.43 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 400 g, or 0.13 g per mm² of the 47×66 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 20 mm stud shank the 66 mm width and 28.5 kN C rating suit high-cycle industrial machinery rather than instrument duty The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 400 g roller runs without cantilever bending NUKRE is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 47 mm track diameter and 28.5 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 400 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 66 mm stud length and the published 38 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the NUKRE47?", "a": "The NUKRE47 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 47 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×47×66 mm. Mass is 400 g." }, { "q": "What does the NUKRE47 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE47 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×47×66 mm and the catalogue ratings are C 28.5 kN, C0 38 kN, Cur 4.95 kN." }, { "q": "What is the load capacity of the NUKRE47?", "a": "The basic dynamic load rating C is 28.5 kN and the basic static load rating C0 is 38 kN; the fatigue load limit Cur is 4.95 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE47?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE47 fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 47 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE47", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE47", "NUKRE47" ], "locale_variants": {} }, { "sku": "PWKR47-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR47-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 24.6, "static_load_kN": 31, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×66 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 24.6 kN and C0 31 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.79 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.8 kN at 20 mm stud, equivalent to 1.23 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.37 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 380 g, or 0.12 g per mm² of the 47×66 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 20 mm stud shank the 66 mm width and 24.6 kN C rating suit high-cycle industrial machinery rather than instrument duty The 20 mm stud clamps into the machine frame with its nut and washer while the 47 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 66 mm PWKR is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,800 r/min limit. The sealed 2RS execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 47 mm track diameter and 24.6 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 380 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 66 mm stud length and the published 31 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the PWKR47-2RS-XL?", "a": "The PWKR47-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 47 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×47×66 mm. Mass is 380 g." }, { "q": "What does the PWKR47-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR47-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×47×66 mm and the catalogue ratings are C 24.6 kN, C0 31 kN, Cur 3.8 kN." }, { "q": "What is the load capacity of the PWKR47-2RS-XL?", "a": "The basic dynamic load rating C is 24.6 kN and the basic static load rating C0 is 31 kN; the fatigue load limit Cur is 3.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR47-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR47-2RS-XL fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 47 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR47", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR47-2RS-XL", "PWKR47-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE47-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE47-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 20, "D_mm": 47, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 24.6, "static_load_kN": 31, "fatigue_load_limit_kN": 3.8, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×47×66 mm: the 47 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 24.6 kN and C0 31 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.79 reflects a rolling-element pack sized for heavy static track loading, and the 13.5 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 3.8 kN at 20 mm stud, equivalent to 1.23 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.37 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 400 g, or 0.13 g per mm² of the 47×66 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 20 mm stud shank the 66 mm width and 24.6 kN C rating suit high-cycle industrial machinery rather than instrument duty The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 3,800 r/min and no thermal reference speed is given for track rollers Stud mounting puts all moment load into the bracket — torque the stud nut to the catalogue value, support the shank over its full length, and use the eccentric collar only for its small design adjustment range The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,800 r/min limit. The sealed 2RS execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 47 mm track diameter and 24.6 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 400 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 66 mm stud length and the published 31 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the PWKRE47-2RS-XL?", "a": "The PWKRE47-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 47 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×47×66 mm. Mass is 400 g." }, { "q": "What does the PWKRE47-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE47-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×47×66 mm and the catalogue ratings are C 24.6 kN, C0 31 kN, Cur 3.8 kN." }, { "q": "What is the load capacity of the PWKRE47-2RS-XL?", "a": "The basic dynamic load rating C is 24.6 kN and the basic static load rating C0 is 31 kN; the fatigue load limit Cur is 3.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE47-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE47-2RS-XL fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 47 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE47", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE47-2RS-XL", "PWKRE47-2RS-XL" ], "locale_variants": {} }, { "sku": "NUKR52", "brand": "FAG", "manufacturer_designation": "NUKR52", "series": "nukr-series", "type": "support_roller", "d_mm": 20, "D_mm": 52, "B_mm": 66, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 29.5, "static_load_kN": 41.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 29.5 kN and C0 41.5 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.4 kN at 20 mm stud, equivalent to 1.48 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.45 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 450 g, or 0.13 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm stud shank this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 4,200 r/min and no thermal reference speed is given for track rollers Stud mounting puts all moment load into the bracket — torque the stud nut to the catalogue value, support the shank over its full length, and use the eccentric collar only for its small design adjustment range Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 52 mm track diameter and 29.5 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 450 g mass keeps follower kinetics light. Designers also specify it for conveyor transfer and diverting stations, relying on the 66 mm stud length and the published 41.5 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the NUKR52?", "a": "The NUKR52 is a NUKR double-row full-complement stud-type track roller with 52 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×52×66 mm. Mass is 450 g." }, { "q": "What does the NUKR52 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR52 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×52×66 mm and the catalogue ratings are C 29.5 kN, C0 41.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NUKR52?", "a": "The basic dynamic load rating C is 29.5 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 5.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR52?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR52 fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 52 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR52", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR52", "NUKR52" ], "locale_variants": {} }, { "sku": "NUKRE52", "brand": "FAG", "manufacturer_designation": "NUKRE52", "series": "nukre-series", "type": "support_roller", "d_mm": 20, "D_mm": 52, "B_mm": 66, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 29.5, "static_load_kN": 41.5, "fatigue_load_limit_kN": 5.4, "limiting_speed_rpm": 4200, "max_rpm": 4200, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 29.5 kN and C0 41.5 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.4 kN at 20 mm stud, equivalent to 1.48 kN of dynamic rating per millimetre — the limiting speed is 4,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.45 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 470 g, or 0.14 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm stud shank this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 470 g roller runs without cantilever bending NUKRE is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 52 mm track diameter and 29.5 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 470 g mass keeps follower kinetics light. Designers also specify it for agricultural and textile cam followers, relying on the 66 mm stud length and the published 41.5 kN static rating. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 66 mm stud unusable.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the NUKRE52?", "a": "The NUKRE52 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 52 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×52×66 mm. Mass is 470 g." }, { "q": "What does the NUKRE52 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE52 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 20×52×66 mm and the catalogue ratings are C 29.5 kN, C0 41.5 kN, Cur 5.4 kN." }, { "q": "What is the load capacity of the NUKRE52?", "a": "The basic dynamic load rating C is 29.5 kN and the basic static load rating C0 is 41.5 kN; the fatigue load limit Cur is 5.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE52?", "a": "HR1 lists a limiting speed of 4,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE52 fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 52 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE52", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE52", "NUKRE52" ], "locale_variants": {} }, { "sku": "PWKR52-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR52-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 20, "D_mm": 52, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 25.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 25.5 kN and C0 33.5 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.2 kN at 20 mm stud, equivalent to 1.27 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.39 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 450 g, or 0.13 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam the 20 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty PWKR is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 450 g roller runs without cantilever bending The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 20×52×66 mm envelope. With 2RS seals the 450 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 52 mm track diameter and 25.5 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 450 g mass keeps follower kinetics light. Designers also specify it for robotic arm linear axes, relying on the 66 mm stud length and the published 33.5 kN static rating. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "conveyor transfer and diverting stations", "woodworking machine feed tracks", "automotive welding jig rollers", "automatic assembly machine carriages" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the PWKR52-2RS-XL?", "a": "The PWKR52-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 52 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×52×66 mm. Mass is 450 g." }, { "q": "What does the PWKR52-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR52-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×52×66 mm and the catalogue ratings are C 25.5 kN, C0 33.5 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the PWKR52-2RS-XL?", "a": "The basic dynamic load rating C is 25.5 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 4.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR52-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR52-2RS-XL fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 52 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR52", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR52-2RS-XL", "PWKR52-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE52-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE52-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 20, "D_mm": 52, "B_mm": 66, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 25.5, "static_load_kN": 33.5, "fatigue_load_limit_kN": 4.2, "limiting_speed_rpm": 3800, "max_rpm": 3800, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 20×52×66 mm: the 52 mm outside diameter is the track-running surface — a thick-walled outer ring over a 20 mm stud — and the 66 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 25.5 kN and C0 33.5 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 16.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 4.2 kN at 20 mm stud, equivalent to 1.27 kN of dynamic rating per millimetre — the limiting speed is 3,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 20 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.39 kN per millimetre of rolling-element complement within the 66 mm overall stud length mass is 470 g, or 0.14 g per mm² of the 52×66 mm track envelope — inertia that the drive must accelerate on every index of the cam at 20 mm stud shank this size balances the 52 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The 20 mm stud clamps into the machine frame with its nut and washer while the 52 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 66 mm The -XL suffix is the Schaeffler X-life mark: interchangeable envelope with the basic bearing, but higher load capacity and lower running temperature at the 3,800 r/min limit. The sealed 2RS execution protects the rolling elements in dirty conveyors and cam drives; seal lip drag is the reason for the conservative speed rating. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 52 mm track diameter and 25.5 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 470 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 66 mm stud length and the published 33.5 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the PWKRE52-2RS-XL?", "a": "The PWKRE52-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 52 mm outside diameter, 20 mm stud diameter and 66 mm overall length, envelope 20×52×66 mm. Mass is 470 g." }, { "q": "What does the PWKRE52-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE52-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 20×52×66 mm and the catalogue ratings are C 25.5 kN, C0 33.5 kN, Cur 4.2 kN." }, { "q": "What is the load capacity of the PWKRE52-2RS-XL?", "a": "The basic dynamic load rating C is 25.5 kN and the basic static load rating C0 is 33.5 kN; the fatigue load limit Cur is 4.2 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE52-2RS-XL?", "a": "HR1 lists a limiting speed of 3,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE52-2RS-XL fitted and adjusted?", "a": "The 20 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 52 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE52", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE52-2RS-XL", "PWKRE52-2RS-XL" ], "locale_variants": {} }, { "sku": "NUKR62", "brand": "FAG", "manufacturer_designation": "NUKR62", "series": "nukr-series", "type": "support_roller", "d_mm": 24, "D_mm": 62, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 40.5, "static_load_kN": 55, "fatigue_load_limit_kN": 7.4, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 795, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×62×80 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 40.5 kN and C0 55 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.74 reflects a rolling-element pack sized for heavy static track loading, and the 19.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.4 kN at 24 mm stud, equivalent to 1.69 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.51 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 795 g, or 0.16 g per mm² of the 62×80 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 24 mm stud shank the 80 mm width and 40.5 kN C rating suit high-cycle industrial machinery rather than instrument duty Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, with labyrinth-style protection at the faces Stud mounting puts all moment load into the bracket — torque the stud nut to the catalogue value, support the shank over its full length, and use the eccentric collar only for its small design adjustment range Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 62 mm track diameter and 40.5 kN dynamic rating match the duty. In glass and ceramic line conveyors the threaded stud bolts directly to the frame, and in linear rail and profile track guidance the 795 g mass keeps follower kinetics light. Designers also specify it for printing press sheet-transfer grippers, relying on the 80 mm stud length and the published 55 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "automatic assembly machine carriages", "agricultural and textile cam followers", "linear rail and profile track guidance", "glass and ceramic line conveyors" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 80 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the NUKR62?", "a": "The NUKR62 is a NUKR double-row full-complement stud-type track roller with 62 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×62×80 mm. Mass is 795 g." }, { "q": "What does the NUKR62 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR62 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×62×80 mm and the catalogue ratings are C 40.5 kN, C0 55 kN, Cur 7.4 kN." }, { "q": "What is the load capacity of the NUKR62?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 7.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR62?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR62 fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 62 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR62", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR62", "NUKR62" ], "locale_variants": {} }, { "sku": "NUKRE62", "brand": "FAG", "manufacturer_designation": "NUKRE62", "series": "nukre-series", "type": "support_roller", "d_mm": 24, "D_mm": 62, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 40.5, "static_load_kN": 55, "fatigue_load_limit_kN": 7.4, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 824, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×62×80 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 40.5 kN and C0 55 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.74 reflects a rolling-element pack sized for heavy static track loading, and the 19.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.4 kN at 24 mm stud, equivalent to 1.69 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.51 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 824 g, or 0.17 g per mm² of the 62×80 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 24 mm stud shank the 80 mm width and 40.5 kN C rating suit high-cycle industrial machinery rather than instrument duty Stud mounting puts all moment load into the bracket — torque the stud nut to the catalogue value, support the shank over its full length, and use the eccentric collar only for its small design adjustment range Two cageless roller rows deliver C 40.5 kN and C0 55 kN, 1.69 kN of dynamic rating per millimetre of stud — the heaviest track-roller ratings in the HR1 range Typical applications include automatic assembly machine carriages, automotive welding jig rollers and linear rail and profile track guidance, where the 62 mm track diameter and 40.5 kN dynamic rating match the duty. In automatic assembly machine carriages the threaded stud bolts directly to the frame, and in automotive welding jig rollers the 824 g mass keeps follower kinetics light. Designers also specify it for linear rail and profile track guidance, relying on the 80 mm stud length and the published 55 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 80 mm stud unusable.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 80 mm stud unusable.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement." ], "faq": [ { "q": "What are the dimensions of the NUKRE62?", "a": "The NUKRE62 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 62 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×62×80 mm. Mass is 824 g." }, { "q": "What does the NUKRE62 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE62 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×62×80 mm and the catalogue ratings are C 40.5 kN, C0 55 kN, Cur 7.4 kN." }, { "q": "What is the load capacity of the NUKRE62?", "a": "The basic dynamic load rating C is 40.5 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 7.4 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE62?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE62 fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 62 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE62", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE62", "NUKRE62" ], "locale_variants": {} }, { "sku": "PWKR62-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR62-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 24, "D_mm": 62, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 35, "static_load_kN": 46, "fatigue_load_limit_kN": 5.9, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 795, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×62×80 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 35 kN and C0 46 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 19.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.9 kN at 24 mm stud, equivalent to 1.46 kN of dynamic rating per millimetre — the limiting speed is 2,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.44 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 795 g, or 0.16 g per mm² of the 62×80 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 24 mm stud shank the 80 mm width and 35 kN C rating suit high-cycle industrial machinery rather than instrument duty PWKR is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 2,200 r/min and no thermal reference speed is given for track rollers The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 24×62×80 mm envelope. With 2RS seals the 795 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 62 mm track diameter and 35 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 795 g mass keeps follower kinetics light. Designers also specify it for cam drives and indexing tables, relying on the 80 mm stud length and the published 46 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the PWKR62-2RS-XL?", "a": "The PWKR62-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 62 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×62×80 mm. Mass is 795 g." }, { "q": "What does the PWKR62-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR62-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 24×62×80 mm and the catalogue ratings are C 35 kN, C0 46 kN, Cur 5.9 kN." }, { "q": "What is the load capacity of the PWKR62-2RS-XL?", "a": "The basic dynamic load rating C is 35 kN and the basic static load rating C0 is 46 kN; the fatigue load limit Cur is 5.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR62-2RS-XL?", "a": "HR1 lists a limiting speed of 2,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR62-2RS-XL fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 62 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR62", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR62-2RS-XL", "PWKR62-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE62-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE62-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 24, "D_mm": 62, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 35, "static_load_kN": 46, "fatigue_load_limit_kN": 5.9, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 824, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×62×80 mm: the 62 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 35 kN and C0 46 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.76 reflects a rolling-element pack sized for heavy static track loading, and the 19.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 5.9 kN at 24 mm stud, equivalent to 1.46 kN of dynamic rating per millimetre — the limiting speed is 2,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.44 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 824 g, or 0.17 g per mm² of the 62×80 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 24 mm stud shank the 80 mm width and 35 kN C rating suit high-cycle industrial machinery rather than instrument duty The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 2,200 r/min and no thermal reference speed is given for track rollers The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 24×62×80 mm envelope. With 2RS seals the 824 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 62 mm track diameter and 35 kN dynamic rating match the duty. In woodworking machine feed tracks the threaded stud bolts directly to the frame, and in cam drives and indexing tables the 824 g mass keeps follower kinetics light. Designers also specify it for packaging machine timing mechanisms, relying on the 80 mm stud length and the published 46 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket." ], "faq": [ { "q": "What are the dimensions of the PWKRE62-2RS-XL?", "a": "The PWKRE62-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 62 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×62×80 mm. Mass is 824 g." }, { "q": "What does the PWKRE62-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE62-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 24×62×80 mm and the catalogue ratings are C 35 kN, C0 46 kN, Cur 5.9 kN." }, { "q": "What is the load capacity of the PWKRE62-2RS-XL?", "a": "The basic dynamic load rating C is 35 kN and the basic static load rating C0 is 46 kN; the fatigue load limit Cur is 5.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE62-2RS-XL?", "a": "HR1 lists a limiting speed of 2,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE62-2RS-XL fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 62 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE62", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE62-2RS-XL", "PWKRE62-2RS-XL" ], "locale_variants": {} }, { "sku": "NUKR72", "brand": "FAG", "manufacturer_designation": "NUKR72", "series": "nukr-series", "type": "support_roller", "d_mm": 24, "D_mm": 72, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45, "static_load_kN": 66, "fatigue_load_limit_kN": 8.9, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 1020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 45 kN and C0 66 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.9 kN at 24 mm stud, equivalent to 1.88 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.56 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.02 kg (1020 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The 24 mm stud clamps into the machine frame with its nut and washer while the 72 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 80 mm The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 1020 g roller runs without cantilever bending Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 72 mm track diameter and 45 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 1.02 kg mass is part of the rotor inertia calculation. Designers also specify it for robotic arm linear axes, relying on the 80 mm stud length and the published 66 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "woodworking machine feed tracks", "linear rail and profile track guidance", "packaging machine timing mechanisms", "agricultural and textile cam followers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the NUKR72?", "a": "The NUKR72 is a NUKR double-row full-complement stud-type track roller with 72 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×72×80 mm. Mass is 1.02 kg." }, { "q": "What does the NUKR72 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR72 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×72×80 mm and the catalogue ratings are C 45 kN, C0 66 kN, Cur 8.9 kN." }, { "q": "What is the load capacity of the NUKR72?", "a": "The basic dynamic load rating C is 45 kN and the basic static load rating C0 is 66 kN; the fatigue load limit Cur is 8.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR72?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR72 fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 72 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR72", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR72", "NUKR72" ], "locale_variants": {} }, { "sku": "NUKRE72", "brand": "FAG", "manufacturer_designation": "NUKRE72", "series": "nukre-series", "type": "support_roller", "d_mm": 24, "D_mm": 72, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45, "static_load_kN": 66, "fatigue_load_limit_kN": 8.9, "limiting_speed_rpm": 2600, "max_rpm": 2600, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 45 kN and C0 66 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.68 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 8.9 kN at 24 mm stud, equivalent to 1.88 kN of dynamic rating per millimetre — the limiting speed is 2,600 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.56 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.05 kg (1050 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the designation: the trailing E marks the eccentric locking collar — turning the collar shifts the roller centre to take up clearance or preload against the track, with labyrinth-style protection at the faces NUKRE is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 72 mm track diameter and 45 kN dynamic rating match the duty. In woodworking machine feed tracks the threaded stud bolts directly to the frame, and in cam drives and indexing tables the 1.05 kg mass is part of the rotor inertia calculation. Designers also specify it for packaging machine timing mechanisms, relying on the 80 mm stud length and the published 66 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the NUKRE72?", "a": "The NUKRE72 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 72 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×72×80 mm. Mass is 1.05 kg." }, { "q": "What does the NUKRE72 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE72 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 24×72×80 mm and the catalogue ratings are C 45 kN, C0 66 kN, Cur 8.9 kN." }, { "q": "What is the load capacity of the NUKRE72?", "a": "The basic dynamic load rating C is 45 kN and the basic static load rating C0 is 66 kN; the fatigue load limit Cur is 8.9 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE72?", "a": "HR1 lists a limiting speed of 2,600 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE72 fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 72 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE72", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE72", "NUKRE72" ], "locale_variants": {} }, { "sku": "PWKR72-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR72-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 24, "D_mm": 72, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 39, "static_load_kN": 55, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 1020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 39 kN and C0 55 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.1 kN at 24 mm stud, equivalent to 1.63 kN of dynamic rating per millimetre — the limiting speed is 2,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.49 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.02 kg (1020 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam the 24 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 2,200 r/min and no thermal reference speed is given for track rollers The 24 mm stud clamps into the machine frame with its nut and washer while the 72 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 80 mm -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 39 kN C rating and longer nominal life come without an envelope change. The 2RS suffix fits elastomer contact seals on both sides, retaining the life-long grease fill behind the 72 mm outer ring. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 72 mm track diameter and 39 kN dynamic rating match the duty. In woodworking machine feed tracks the threaded stud bolts directly to the frame, and in cam drives and indexing tables the 1.02 kg mass is part of the rotor inertia calculation. Designers also specify it for packaging machine timing mechanisms, relying on the 80 mm stud length and the published 55 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "cam drives and indexing tables", "automatic assembly machine carriages", "woodworking machine feed tracks", "packaging machine timing mechanisms" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the PWKR72-2RS-XL?", "a": "The PWKR72-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 72 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×72×80 mm. Mass is 1.02 kg." }, { "q": "What does the PWKR72-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR72-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 24×72×80 mm and the catalogue ratings are C 39 kN, C0 55 kN, Cur 7.1 kN." }, { "q": "What is the load capacity of the PWKR72-2RS-XL?", "a": "The basic dynamic load rating C is 39 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 7.1 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR72-2RS-XL?", "a": "HR1 lists a limiting speed of 2,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR72-2RS-XL fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 72 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR72", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR72-2RS-XL", "PWKR72-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE72-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE72-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 24, "D_mm": 72, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 39, "static_load_kN": 55, "fatigue_load_limit_kN": 7.1, "limiting_speed_rpm": 2200, "max_rpm": 2200, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 24×72×80 mm: the 72 mm outside diameter is the track-running surface — a thick-walled outer ring over a 24 mm stud — and the 80 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 39 kN and C0 55 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.71 reflects a rolling-element pack sized for heavy static track loading, and the 24.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 7.1 kN at 24 mm stud, equivalent to 1.63 kN of dynamic rating per millimetre — the limiting speed is 2,200 r/min and, as for HR1 track rollers, no thermal reference speed is published the 24 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.49 kN per millimetre of rolling-element complement within the 80 mm overall stud length mass is 1.05 kg (1050 g), or 0.18 g per mm² of the 72×80 mm track envelope — inertia that the drive must accelerate on every index of the cam at 24 mm stud shank this size balances the 72 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range Two cageless roller rows deliver C 39 kN and C0 55 kN, 1.63 kN of dynamic rating per millimetre of stud — the heaviest track-roller ratings in the HR1 range The 24 mm stud clamps into the machine frame with its nut and washer while the 72 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 80 mm The -XL suffix marks the X-life execution: refined raceway topography and upgraded materials lift the basic ratings versus the non-X-life bearing at the same 24×72×80 mm envelope. With 2RS seals the 1050 g roller is effectively sealed for life — no relubrication path is provided and none is needed over the design life. Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 72 mm track diameter and 39 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 1.05 kg mass is part of the rotor inertia calculation. Designers also specify it for glass and ceramic line conveyors, relying on the 80 mm stud length and the published 55 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the PWKRE72-2RS-XL?", "a": "The PWKRE72-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 72 mm outside diameter, 24 mm stud diameter and 80 mm overall length, envelope 24×72×80 mm. Mass is 1.05 kg." }, { "q": "What does the PWKRE72-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE72-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 24×72×80 mm and the catalogue ratings are C 39 kN, C0 55 kN, Cur 7.1 kN." }, { "q": "What is the load capacity of the PWKRE72-2RS-XL?", "a": "The basic dynamic load rating C is 39 kN and the basic static load rating C0 is 55 kN; the fatigue load limit Cur is 7.1 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE72-2RS-XL?", "a": "HR1 lists a limiting speed of 2,200 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE72-2RS-XL fitted and adjusted?", "a": "The 24 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 72 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE72", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE72-2RS-XL", "PWKRE72-2RS-XL" ], "locale_variants": {} }, { "sku": "NUKR80", "brand": "FAG", "manufacturer_designation": "NUKR80", "series": "nukr-series", "type": "support_roller", "d_mm": 30, "D_mm": 80, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 69, "static_load_kN": 105, "fatigue_load_limit_kN": 14.3, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×80×100 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 69 kN and C0 105 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.66 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 14.3 kN at 30 mm stud, equivalent to 2.30 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.69 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.6 kg (1600 g), or 0.20 g per mm² of the 80×100 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 30 mm stud shank the 100 mm width and 69 kN C rating suit high-cycle industrial machinery rather than instrument duty The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 1,800 r/min and no thermal reference speed is given for track rollers Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, with labyrinth-style protection at the faces Typical applications include printing press sheet-transfer grippers, glass and ceramic line conveyors and cam drives and indexing tables, where the 80 mm track diameter and 69 kN dynamic rating match the duty. In printing press sheet-transfer grippers the threaded stud bolts directly to the frame, and in glass and ceramic line conveyors the 1.6 kg mass is part of the rotor inertia calculation. Designers also specify it for cam drives and indexing tables, relying on the 100 mm stud length and the published 105 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "applications": [ "packaging machine timing mechanisms", "glass and ceramic line conveyors", "agricultural and textile cam followers", "robotic arm linear axes" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the NUKR80?", "a": "The NUKR80 is a NUKR double-row full-complement stud-type track roller with 80 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×80×100 mm. Mass is 1.6 kg." }, { "q": "What does the NUKR80 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR80 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×80×100 mm and the catalogue ratings are C 69 kN, C0 105 kN, Cur 14.3 kN." }, { "q": "What is the load capacity of the NUKR80?", "a": "The basic dynamic load rating C is 69 kN and the basic static load rating C0 is 105 kN; the fatigue load limit Cur is 14.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR80?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR80 fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 80 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR80", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR80", "NUKR80" ], "locale_variants": {} }, { "sku": "NUKRE80", "brand": "FAG", "manufacturer_designation": "NUKRE80", "series": "nukre-series", "type": "support_roller", "d_mm": 30, "D_mm": 80, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 69, "static_load_kN": 105, "fatigue_load_limit_kN": 14.3, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×80×100 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 69 kN and C0 105 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.66 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 14.3 kN at 30 mm stud, equivalent to 2.30 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.69 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.67 kg (1670 g), or 0.21 g per mm² of the 80×100 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 30 mm stud shank the 100 mm width and 69 kN C rating suit high-cycle industrial machinery rather than instrument duty The 30 mm stud clamps into the machine frame with its nut and washer while the 80 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 100 mm NUKRE is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket Typical applications include linear rail and profile track guidance, automatic assembly machine carriages and glass and ceramic line conveyors, where the 80 mm track diameter and 69 kN dynamic rating match the duty. In linear rail and profile track guidance the threaded stud bolts directly to the frame, and in automatic assembly machine carriages the 1.67 kg mass is part of the rotor inertia calculation. Designers also specify it for glass and ceramic line conveyors, relying on the 100 mm stud length and the published 105 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the NUKRE80?", "a": "The NUKRE80 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 80 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×80×100 mm. Mass is 1.67 kg." }, { "q": "What does the NUKRE80 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE80 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×80×100 mm and the catalogue ratings are C 69 kN, C0 105 kN, Cur 14.3 kN." }, { "q": "What is the load capacity of the NUKRE80?", "a": "The basic dynamic load rating C is 69 kN and the basic static load rating C0 is 105 kN; the fatigue load limit Cur is 14.3 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE80?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE80 fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 80 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE80", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE80", "NUKRE80" ], "locale_variants": {} }, { "sku": "PWKR80-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR80-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 30, "D_mm": 80, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 56, "static_load_kN": 80, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×80×100 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 56 kN and C0 80 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.70 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 10.8 kN at 30 mm stud, equivalent to 1.87 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.56 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.6 kg (1600 g), or 0.20 g per mm² of the 80×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, and the 2RS seals close both sides for a greased-for-life unit PWKR is a double-row full-complement stud-type track roller: two cylindrical roller rows run on a heavy-section threaded stud, ready to bolt straight into a bracket X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 80 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 30 mm-bore unit greased for life. Typical applications include agricultural and textile cam followers, packaging machine timing mechanisms and robotic arm linear axes, where the 80 mm track diameter and 56 kN dynamic rating match the duty. In agricultural and textile cam followers the threaded stud bolts directly to the frame, and in packaging machine timing mechanisms the 1.6 kg mass is part of the rotor inertia calculation. Designers also specify it for robotic arm linear axes, relying on the 100 mm stud length and the published 80 kN static rating. Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "robotic arm linear axes", "cam drives and indexing tables", "conveyor transfer and diverting stations", "automotive welding jig rollers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further." ], "faq": [ { "q": "What are the dimensions of the PWKR80-2RS-XL?", "a": "The PWKR80-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 80 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×80×100 mm. Mass is 1.6 kg." }, { "q": "What does the PWKR80-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR80-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×80×100 mm and the catalogue ratings are C 56 kN, C0 80 kN, Cur 10.8 kN." }, { "q": "What is the load capacity of the PWKR80-2RS-XL?", "a": "The basic dynamic load rating C is 56 kN and the basic static load rating C0 is 80 kN; the fatigue load limit Cur is 10.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR80-2RS-XL?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR80-2RS-XL fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 80 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR80", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR80-2RS-XL", "PWKR80-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE80-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE80-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 30, "D_mm": 80, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 56, "static_load_kN": 80, "fatigue_load_limit_kN": 10.8, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×80×100 mm: the 80 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 56 kN and C0 80 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.70 reflects a rolling-element pack sized for heavy static track loading, and the 25.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 10.8 kN at 30 mm stud, equivalent to 1.87 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.56 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.67 kg (1670 g), or 0.21 g per mm² of the 80×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 1670 g roller runs without cantilever bending X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 80 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 30 mm-bore unit greased for life. Typical applications include conveyor transfer and diverting stations, robotic arm linear axes and automotive welding jig rollers, where the 80 mm track diameter and 56 kN dynamic rating match the duty. In conveyor transfer and diverting stations the threaded stud bolts directly to the frame, and in robotic arm linear axes the 1.67 kg mass is part of the rotor inertia calculation. Designers also specify it for automotive welding jig rollers, relying on the 100 mm stud length and the published 80 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "automotive welding jig rollers", "packaging machine timing mechanisms", "automatic assembly machine carriages", "linear rail and profile track guidance" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the PWKRE80-2RS-XL?", "a": "The PWKRE80-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 80 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×80×100 mm. Mass is 1.67 kg." }, { "q": "What does the PWKRE80-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE80-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×80×100 mm and the catalogue ratings are C 56 kN, C0 80 kN, Cur 10.8 kN." }, { "q": "What is the load capacity of the PWKRE80-2RS-XL?", "a": "The basic dynamic load rating C is 56 kN and the basic static load rating C0 is 80 kN; the fatigue load limit Cur is 10.8 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE80-2RS-XL?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE80-2RS-XL fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 80 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE80", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE80-2RS-XL", "PWKRE80-2RS-XL" ], "locale_variants": {} }, { "sku": "NUKR90", "brand": "FAG", "manufacturer_designation": "NUKR90", "series": "nukr-series", "type": "support_roller", "d_mm": 30, "D_mm": 90, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 79, "static_load_kN": 126, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1960, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 79 kN and C0 126 kN for the NUKR double-row full-complement stud-type track roller; the C/C0 ratio of 0.63 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 17 kN at 30 mm stud, equivalent to 2.63 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.79 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.96 kg (1960 g), or 0.22 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Reading the designation: no eccentric collar is fitted — the roller centre is fixed by the stud axis, with labyrinth-style protection at the faces Typical applications include robotic arm linear axes, agricultural and textile cam followers and conveyor transfer and diverting stations, where the 90 mm track diameter and 79 kN dynamic rating match the duty. In robotic arm linear axes the threaded stud bolts directly to the frame, and in agricultural and textile cam followers the 1.96 kg mass is part of the rotor inertia calculation. Designers also specify it for conveyor transfer and diverting stations, relying on the 100 mm stud length and the published 126 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "applications": [ "linear rail and profile track guidance", "robotic arm linear axes", "glass and ceramic line conveyors", "printing press sheet-transfer grippers" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Never hammer the stud or use the hex socket as a press point during mounting; thread or socket damage renders the 100 mm stud unusable." ], "faq": [ { "q": "What are the dimensions of the NUKR90?", "a": "The NUKR90 is a NUKR double-row full-complement stud-type track roller with 90 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×90×100 mm. Mass is 1.96 kg." }, { "q": "What does the NUKR90 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKR90 identifies this NUKR double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×90×100 mm and the catalogue ratings are C 79 kN, C0 126 kN, Cur 17 kN." }, { "q": "What is the load capacity of the NUKR90?", "a": "The basic dynamic load rating C is 79 kN and the basic static load rating C0 is 126 kN; the fatigue load limit Cur is 17 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKR90?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKR90 fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 90 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKR90", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKR90", "NUKR90" ], "locale_variants": {} }, { "sku": "NUKRE90", "brand": "FAG", "manufacturer_designation": "NUKRE90", "series": "nukre-series", "type": "support_roller", "d_mm": 30, "D_mm": 90, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 79, "static_load_kN": 126, "fatigue_load_limit_kN": 17, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 2020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 79 kN and C0 126 kN for the NUKRE double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.63 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 17 kN at 30 mm stud, equivalent to 2.63 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.79 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 2.02 kg (2020 g), or 0.22 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam the 30 mm stud shank falls in the small band, the workhorse size for gearbox planetary positions, hydraulic pumps and general cam and linkage duty Two cageless roller rows deliver C 79 kN and C0 126 kN, 2.63 kN of dynamic rating per millimetre of stud — the heaviest track-roller ratings in the HR1 range Typical applications include packaging machine timing mechanisms, woodworking machine feed tracks and agricultural and textile cam followers, where the 90 mm track diameter and 79 kN dynamic rating match the duty. In packaging machine timing mechanisms the threaded stud bolts directly to the frame, and in woodworking machine feed tracks the 2.02 kg mass is part of the rotor inertia calculation. Designers also specify it for agricultural and textile cam followers, relying on the 100 mm stud length and the published 126 kN static rating. Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR. On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR.", "On eccentric KRE/NUKRE/PWKRE units, re-torque after setting the collar — the adjustment changes the effective stud engagement.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval." ], "faq": [ { "q": "What are the dimensions of the NUKRE90?", "a": "The NUKRE90 is a NUKRE double-row full-complement stud-type track roller with eccentric locking collar with 90 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×90×100 mm. Mass is 2.02 kg." }, { "q": "What does the NUKRE90 designation mean in the FAG/INA HR1 catalogue?", "a": "NUKRE90 identifies this NUKRE double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue. The envelope is 30×90×100 mm and the catalogue ratings are C 79 kN, C0 126 kN, Cur 17 kN." }, { "q": "What is the load capacity of the NUKRE90?", "a": "The basic dynamic load rating C is 79 kN and the basic static load rating C0 is 126 kN; the fatigue load limit Cur is 17 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the NUKRE90?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the NUKRE90 fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 90 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "NUKRE90", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "NUKRE90", "NUKRE90" ], "locale_variants": {} }, { "sku": "PWKR90-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKR90-2RS-XL", "series": "pwkr-series", "type": "support_roller", "d_mm": 30, "D_mm": 90, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 62, "static_load_kN": 92, "fatigue_load_limit_kN": 12.5, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 1960, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 62 kN and C0 92 kN for the PWKR sealed double-row full-complement stud-type track roller; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 12.5 kN at 30 mm stud, equivalent to 2.07 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.62 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 1.96 kg (1960 g), or 0.22 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam at 30 mm stud shank this size balances the 90 mm outside diameter against machineability of the adjacent parts — the most frequently specified band in the HR1 range The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 1960 g roller runs without cantilever bending The 30 mm stud clamps into the machine frame with its nut and washer while the 90 mm thick-walled, crowned-profile outer ring runs on the cam; overall length is 100 mm X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 92 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 30 mm-bore unit greased for life. Typical applications include glass and ceramic line conveyors, linear rail and profile track guidance and printing press sheet-transfer grippers, where the 90 mm track diameter and 62 kN dynamic rating match the duty. In glass and ceramic line conveyors the threaded stud bolts directly to the frame, and in linear rail and profile track guidance the 1.96 kg mass is part of the rotor inertia calculation. Designers also specify it for printing press sheet-transfer grippers, relying on the 100 mm stud length and the published 92 kN static rating. The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "agricultural and textile cam followers", "printing press sheet-transfer grippers", "robotic arm linear axes", "conveyor transfer and diverting stations" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The stud must be fully supported and the nut torqued to the catalogue value; a loose follower wears the bracket hole oval and loosens further.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Use a washer under the nut and a flat square bracket face; the stud head alone cannot spread the clamp load of the heavy double-row executions." ], "faq": [ { "q": "What are the dimensions of the PWKR90-2RS-XL?", "a": "The PWKR90-2RS-XL is a PWKR sealed double-row full-complement stud-type track roller with 90 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×90×100 mm. Mass is 1.96 kg." }, { "q": "What does the PWKR90-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKR90-2RS-XL identifies this PWKR sealed double-row full-complement stud-type track roller in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×90×100 mm and the catalogue ratings are C 62 kN, C0 92 kN, Cur 12.5 kN." }, { "q": "What is the load capacity of the PWKR90-2RS-XL?", "a": "The basic dynamic load rating C is 62 kN and the basic static load rating C0 is 92 kN; the fatigue load limit Cur is 12.5 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKR90-2RS-XL?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKR90-2RS-XL fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The 90 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKR90", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKR90-2RS-XL", "PWKR90-2RS-XL" ], "locale_variants": {} }, { "sku": "PWKRE90-2RS-XL", "brand": "FAG", "manufacturer_designation": "PWKRE90-2RS-XL", "series": "pwkre-series", "type": "support_roller", "d_mm": 30, "D_mm": 90, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 62, "static_load_kN": 92, "fatigue_load_limit_kN": 12.5, "limiting_speed_rpm": 1800, "max_rpm": 1800, "weight_g": 2020, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "envelope 30×90×100 mm: the 90 mm outside diameter is the track-running surface — a thick-walled outer ring over a 30 mm stud — and the 100 mm overall stud-and-roller length sets the required bracket clearance the catalogue lists C 62 kN and C0 92 kN for the PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar; the C/C0 ratio of 0.67 reflects a rolling-element pack sized for heavy static track loading, and the 30.0 mm radial section gives the outer ring its bending stiffness fatigue load limit Cur is 12.5 kN at 30 mm stud, equivalent to 2.07 kN of dynamic rating per millimetre — the limiting speed is 1,800 r/min and, as for HR1 track rollers, no thermal reference speed is published the 30 mm threaded stud clamps directly into the machine bracket; over the roller running width the dynamic rating works out to 0.62 kN per millimetre of rolling-element complement within the 100 mm overall stud length mass is 2.02 kg (2020 g), or 0.22 g per mm² of the 90×100 mm track envelope — inertia that the drive must accelerate on every index of the cam with a 30 mm stud shank the 100 mm width and 62 kN C rating suit high-cycle industrial machinery rather than instrument duty The outer ring is axially guided by the rolling elements against the stud head and thrust washer; the clamping faces must be square so the 2020 g roller runs without cantilever bending The stud is drilled for relubrication via the lubricating nipple in the head; the limiting speed is 1,800 r/min and no thermal reference speed is given for track rollers X-life status (-XL) indicates the current Schaeffler premium execution at 30 mm bore; the 92 kN C0 rating reflects the improved rolling-contact geometry. Reading the suffix: 2RS is the FAG/INA code for rubbing lip seals at both faces, making the 30 mm-bore unit greased for life. Typical applications include woodworking machine feed tracks, cam drives and indexing tables and packaging machine timing mechanisms, where the 90 mm track diameter and 62 kN dynamic rating match the duty. In woodworking machine feed tracks the threaded stud bolts directly to the frame, and in cam drives and indexing tables the 2.02 kg mass is part of the rotor inertia calculation. Designers also specify it for packaging machine timing mechanisms, relying on the 100 mm stud length and the published 92 kN static rating. The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket. Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "applications": [ "glass and ceramic line conveyors", "conveyor transfer and diverting stations", "printing press sheet-transfer grippers", "cam drives and indexing tables" ], "failure_modes": [ "stud bending and loosening when the shank is not fully supported by the bracket", "bracket hole fretting and ovalisation under an under-torqued mounting nut", "outer-ring fatigue at the cam contact from overloading beyond the track-rated C0", "flat spots on full-complement followers during short-stroke oscillation", "seal destruction and grease loss above the limiting speed on PP/2RS executions", "edge loading after the crowned profile bottoms out against a badly skewed cam", "eccentric-collar slippage when the lock nut is not re-torqued after adjustment", "lubricant starvation of the stud contact when the relubrication interval is ignored", "stud-thread damage from hammering or from using the hex socket as a press point" ], "pitfalls": [ "The eccentric collar throw is small (typically around 1 mm); it removes clearance, it cannot repair a grossly misplaced bracket.", "Sealed PP/2RS followers are life-lubricated; open KR/NUKR executions need the stud greaseway serviced on a fixed interval.", "Full-complement followers trade speed for static capacity — apply the lower limiting speed and expect higher drive torque than a caged KR." ], "faq": [ { "q": "What are the dimensions of the PWKRE90-2RS-XL?", "a": "The PWKRE90-2RS-XL is a PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar with 90 mm outside diameter, 30 mm stud diameter and 100 mm overall length, envelope 30×90×100 mm. Mass is 2.02 kg." }, { "q": "What does the PWKRE90-2RS-XL designation mean in the FAG/INA HR1 catalogue?", "a": "PWKRE90-2RS-XL identifies this PWKRE sealed double-row full-complement stud-type track roller with eccentric locking collar in the Schaeffler HR1 rolling bearings catalogue; the -XL suffix marks the X-life execution. The envelope is 30×90×100 mm and the catalogue ratings are C 62 kN, C0 92 kN, Cur 12.5 kN." }, { "q": "What is the load capacity of the PWKRE90-2RS-XL?", "a": "The basic dynamic load rating C is 62 kN and the basic static load rating C0 is 92 kN; the fatigue load limit Cur is 12.5 kN. For track rollers these values already cover the thick-walled outer ring bending case on an unsupported track." }, { "q": "What is the maximum speed of the PWKRE90-2RS-XL?", "a": "HR1 lists a limiting speed of 1,800 r/min for track rollers and no thermal reference speed. The crowned thick-walled outer ring and (on stud types) the stud contact make the limiting speed the governing figure." }, { "q": "How is a stud-type roller like the PWKRE90-2RS-XL fitted and adjusted?", "a": "The 30 mm threaded stud passes through the bracket and is clamped with its nut and washer against a flat face; torque to the catalogue value and support the shank over its full length. The eccentric locking collar is turned to set the track preload, then the nut is re-torqued. The 90 mm outer ring then runs directly on the cam." } ], "cross_ref": [ { "equiv_sku": "PWKRE90", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#pdfpage=1459", "catalog_ver": "HR1 2026-09-25", "extracted_at": "2026-09-30", "last_verified": "2026-09-30", "confidence_score": 0.7, "status": "published", "aliases": [ "PWKRE90-2RS-XL", "PWKRE90-2RS-XL" ], "locale_variants": {} }, { "sku": "61800-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61800", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.72, "static_load_kN": 0.84, "limiting_speed_rpm": 54000, "reference_speed_rpm": 27500, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "61800 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 19 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61800 with C3 for those conditions.", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "Storage matters for open bearings: 61800-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61800 units.", "Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "The open 61800 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 54000 r/min mechanical limiting speed puts 61800 at the top of the HR 1 deep-groove speed range (thermal reference speed 27500 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 61800 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 1.72 kN dynamic load rating (C) and 0.84 kN static (C0), 61800 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "The 10×19×5 mm envelope of 61800 gives a D/d ratio of 1.90 and 4.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 1.72/0.84 kN load ratings here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61800-FAG on the 10×19×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61800 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61800 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61800; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 61800-FAG bearing?", "a": "A 61800-FAG deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61800 compare with other series at the same 10 mm bore?", "a": "618 is an extra-thin section: 19×5 mm, only 4.5 mm radial section at 10 mm bore, far smaller than a 6210, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "Are 61800 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61800 uses the same ISO 15 envelope (10×19×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the FAG order number for an open 61800?", "a": "FAG lists the open 61800 under the bare designation 61800-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 10 mm bore envelope." }, { "q": "Does FAG offer 61800 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61800-FAG for normal duty." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61800", "61800-FAG" ], "locale_variants": {} }, { "sku": "61800-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61800-2RSR", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.72, "static_load_kN": 0.84, "limiting_speed_rpm": 21000, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 10 = 10 mm. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61800-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61800 with C3 for those conditions.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 10 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6210.", "Contact seals add drag and heat: 61800-2RS-FAG runs slower and cooler-limited than the open 61800; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61800-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61800-2RS-FAG-C3. No clearance suffix means normal CN clearance.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Schaeffler HR 1 lists the lip-contact sealed version as 61800-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61800 at 21000 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 10 mm bore the 61800 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 1.72 kN dynamic load rating (C) and 0.84 kN static (C0), 61800 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 6 g, 61800 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×19×5 mm envelope of 61800 gives a D/d ratio of 1.90 and 4.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 1.72/0.84 kN load ratings, mass 6 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61800-2RSR on the 10×19×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61800 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61800; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61800 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way." ], "faq": [ { "q": "What are the dimensions of a 61800-2RS-FAG bearing?", "a": "A 61800-2RS-FAG deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61800 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61800 uses the same ISO 15 envelope (10×19×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61800-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 61800-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61800 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 61800?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61800-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×19×5 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61800-2RSR." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61800-2RS", "61800-2rs", "61800-2RSR", "61800-2RS-FAG" ], "locale_variants": {} }, { "sku": "61800-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61800-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 10, "D_mm": 19, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.72, "static_load_kN": 0.84, "limiting_speed_rpm": 46000, "reference_speed_rpm": 27500, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61800 carries bore code 10 = 10 mm. Outside diameter 19 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 61800-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61800 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 10 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.", "ZZ shields are non-contact: 61800-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61800-2RS for that.", "Shielded 61800-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61800-ZZ-FAG drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Schaeffler HR 1 lists the shielded version as 61800-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 46000 r/min mechanical limiting speed puts 61800 at the top of the HR 1 deep-groove speed range (thermal reference speed 27500 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 61800 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 1.72 kN dynamic load rating (C) and 0.84 kN static (C0), 61800 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 6 g, 61800 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×19×5 mm envelope of 61800 gives a D/d ratio of 1.90 and 4.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 1.72/0.84 kN load ratings, mass 6 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61800-2Z on the 10×19×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61800 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61800; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61800: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61800-ZZ-FAG bearing?", "a": "A 61800-ZZ-FAG deep-groove ball bearing has a 10 mm bore, 19 mm outer diameter and 5 mm width (0.394 × 0.748 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61800-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 61800-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61800 and verify the residual clearance after mounting." }, { "q": "How should 61800-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the FAG suffix for a sealed 61800?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61800-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×19×5 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61800-2Z." } ], "cross_ref": [ { "equiv_sku": "61800-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61800-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61800", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×19×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61800-ZZ", "61800-zz", "61800-2Z", "61800-ZZ-FAG" ], "locale_variants": {} }, { "sku": "61900-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61900", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "limiting_speed_rpm": 48000, "reference_speed_rpm": 27000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61900 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 22 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61900 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 10 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61900-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61900 units.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 61900 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 48000 r/min mechanical limiting speed puts 61900 at the top of the HR 1 deep-groove speed range (thermal reference speed 27000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 61900 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.7 kN dynamic load rating (C) and 1.27 kN static (C0), 61900 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 10 g, 61900 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×22×6 mm envelope of 61900 gives a D/d ratio of 2.20 and 6.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 2.7/1.27 kN load ratings, mass 10 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61900-FAG on the 10×22×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61900 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61900: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61900-FAG bearing?", "a": "A 61900-FAG deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61900 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61900 uses the same ISO 15 envelope (10×22×6 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61900-FAG have?", "a": "Unless a clearance suffix says otherwise, 61900-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting." }, { "q": "What is the FAG order number for an open 61900?", "a": "FAG lists the open 61900 under the bare designation 61900-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 10 mm bore envelope." }, { "q": "Does FAG offer 61900 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61900-FAG for normal duty." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61900", "61900-FAG" ], "locale_variants": {} }, { "sku": "61900-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61900-2RSR", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.7, "static_load_kN": 1.27, "limiting_speed_rpm": 19200, "weight_g": 12, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61900 carries bore code 10 = 10 mm. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61900-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61900 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61900-2RS-FAG runs slower and cooler-limited than the open 61900; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61900-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 6 mm-wide ring of 61900-2RS-FAG drags the lip and overheats it.", "The housing bore for the 22 mm OD should be round within IT7; an oval bore pinches the outer ring of 61900-2RS-FAG and shows up later as two-point loaded raceway wear.", "Schaeffler HR 1 lists the lip-contact sealed version as 61900-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61900 at 19200 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 10 mm bore the 61900 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.7 kN dynamic load rating (C) and 1.27 kN static (C0), 61900 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 12 g, 61900 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×22×6 mm envelope of 61900 gives a D/d ratio of 2.20 and 6.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 2.7/1.27 kN load ratings, mass 12 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61900-2RSR on the 10×22×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61900 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61900; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 61900-2RS-FAG bearing?", "a": "A 61900-2RS-FAG deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61900 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61900 uses the same ISO 15 envelope (10×22×6 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61900-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 61900-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 61900?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61900-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×22×6 mm ISO 15 envelope." }, { "q": "Does FAG offer 61900 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61900-2RSR for normal duty." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61900-2RS", "61900-2rs", "61900-2RSR", "61900-2RS-FAG" ], "locale_variants": {} }, { "sku": "61900-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61900-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 10, "D_mm": 22, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.7, "static_load_kN": 1.02, "limiting_speed_rpm": 41000, "reference_speed_rpm": 27000, "weight_g": 10, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61900 carries bore code 10 = 10 mm. Outside diameter 22 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 61900-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61900 with C3 for those conditions.", "The 619xx thin section (6.0 mm section height at 10 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "ZZ shields are non-contact: 61900-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61900-2RS for that.", "Do not wash 61900-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 22 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61900-ZZ-FAG.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Schaeffler HR 1 lists the shielded version as 61900-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 41000 r/min mechanical limiting speed puts 61900 at the top of the HR 1 deep-groove speed range (thermal reference speed 27000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 61900 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.7 kN dynamic load rating (C) and 1.02 kN static (C0), 61900 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 10 g, 61900 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×22×6 mm envelope of 61900 gives a D/d ratio of 2.20 and 6.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 2.7/1.02 kN load ratings, mass 10 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61900-2Z on the 10×22×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61900 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61900 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 61900-ZZ-FAG bearing?", "a": "A 61900-ZZ-FAG deep-groove ball bearing has a 10 mm bore, 22 mm outer diameter and 6 mm width (0.394 × 0.866 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 61900 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61900 uses the same ISO 15 envelope (10×22×6 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61900-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 61900-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61900 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 61900?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61900-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×22×6 mm ISO 15 envelope." }, { "q": "Is 61900-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "61900-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61900", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×22×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61900-ZZ", "61900-zz", "61900-2Z", "61900-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6000-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6000-C", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.3, "static_load_kN": 1.97, "limiting_speed_rpm": 44500, "reference_speed_rpm": 30000, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 10 = 10 mm. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6000 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6000-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6000 units.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 26 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6000-FAG.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6000 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 44500 r/min mechanical limiting speed puts 6000 at the top of the HR 1 deep-groove speed range (thermal reference speed 30000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6000 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6000 at 5.3 kN dynamic (C) and 1.97 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 17 g, 6000 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×26×8 mm envelope of 6000 gives a D/d ratio of 2.60 and 8.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 5.3/1.97 kN load ratings, mass 17 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6000-C on the 10×26×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6000 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6000; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units." ], "faq": [ { "q": "What are the dimensions of a 6000-FAG bearing?", "a": "A 6000-FAG deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6000 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6000 uses the same ISO 15 envelope (10×26×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6000-FAG have?", "a": "Unless a clearance suffix says otherwise, 6000-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6000 and verify the residual clearance after mounting." }, { "q": "What is the FAG order number for an open 6000?", "a": "FAG lists the open 6000 under the bare designation 6000-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 10 mm bore envelope." }, { "q": "Does FAG offer 6000 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6000-C for normal duty." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6000", "6000-C", "6000-FAG" ], "locale_variants": {} }, { "sku": "6000-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6000-C-2HRS", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.3, "static_load_kN": 1.97, "limiting_speed_rpm": 28500, "weight_g": 18, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6000 carries bore code 10 = 10 mm. Outside diameter 26 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6000-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6000 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 10 mm bore uses a smaller 26 mm OD than a 6210; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6000-2RS-FAG runs slower and cooler-limited than the open 6000; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6000-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Measure the shaft, do not trust the drawing: a 10 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6000-2RS-FAG.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 8 mm-wide ring of 6000-2RS-FAG drags the lip and overheats it.", "Schaeffler HR 1 lists the lip-contact sealed version as 6000-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "The 28500 r/min mechanical limiting speed puts 6000 at the top of the HR 1 deep-groove speed range; at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6000 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6000 at 5.3 kN dynamic (C) and 1.97 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 18 g, 6000 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×26×8 mm envelope of 6000 gives a D/d ratio of 2.60 and 8.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 5.3/1.97 kN load ratings, mass 18 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6000-C-2HRS on the 10×26×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6000 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6000: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 6000-2RS-FAG bearing?", "a": "A 6000-2RS-FAG deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 6000-2RS-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6000-2RS-FAG need?", "a": "6000-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6000 with a housing grease fitting instead." }, { "q": "What is the FAG suffix for a sealed 6000?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6000-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×26×8 mm ISO 15 envelope." }, { "q": "Does FAG offer 6000 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6000-C-2HRS for normal duty." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6000-2RS", "6000-2rs", "6000-C-2HRS", "6000-2RS-FAG" ], "locale_variants": {} }, { "sku": "6000-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6000-C-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 10, "D_mm": 26, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.3, "static_load_kN": 1.97, "limiting_speed_rpm": 38000, "reference_speed_rpm": 30000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6000-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 26 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6000-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6000 against the shaft shoulder while it cools so the ring cannot creep back.", "Choosing the 60xx extra-light section saves radial space at 10 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6210 before committing to the smaller envelope.", "Do not wash 6000-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6000-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Schaeffler HR 1 lists the shielded version as 6000-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 38000 r/min mechanical limiting speed puts 6000 at the top of the HR 1 deep-groove speed range (thermal reference speed 30000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6000 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6000 at 5.3 kN dynamic (C) and 1.97 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 19 g, 6000 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×26×8 mm envelope of 6000 gives a D/d ratio of 2.60 and 8.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 5.3/1.97 kN load ratings, mass 19 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6000-C-2Z on the 10×26×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6000 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6000; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6000-ZZ-FAG bearing?", "a": "A 6000-ZZ-FAG deep-groove ball bearing has a 10 mm bore, 26 mm outer diameter and 8 mm width (0.394 × 1.024 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6000-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6000-ZZ-FAG need?", "a": "6000-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the FAG suffix for a sealed 6000?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6000-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×26×8 mm ISO 15 envelope." }, { "q": "Is 6000-C-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6000-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6000", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×26×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6000-ZZ", "6000-zz", "6000-C-2Z", "6000-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6200-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6200-C", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7, "static_load_kN": 2.6, "limiting_speed_rpm": 40500, "reference_speed_rpm": 26000, "weight_g": 29, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6200 carries bore code 10 = 10 mm. Outside diameter 30 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6200 against the shaft shoulder while it cools so the ring cannot creep back.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "The open 6200-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 10×30×9 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6200 units.", "Vibration during standstill brinells the raceways of a 10 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Never mix components between two 6200-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6200 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 40500 r/min mechanical limiting speed puts 6200 at the top of the HR 1 deep-groove speed range (thermal reference speed 26000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6200 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6200 at 7 kN dynamic (C) and 2.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 29 g, 6200 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×30×9 mm envelope of 6200 gives a D/d ratio of 3.00 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 7/2.6 kN load ratings, mass 29 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6200-C on the 10×30×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6200 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6200; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units." ], "faq": [ { "q": "What are the dimensions of a 6200-FAG bearing?", "a": "A 6200-FAG deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6200 compare with other series at the same 10 mm bore?", "a": "The '2' is the light diameter series: 30×9 mm with a 10.0 mm radial section at 10 mm bore. A 6310 on the same bore is larger and higher-rated; a 6010 is smaller and lower-rated." }, { "q": "Are 6200 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6200 uses the same ISO 15 envelope (10×30×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the FAG order number for an open 6200?", "a": "FAG lists the open 6200 under the bare designation 6200-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 10 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6200-C." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6200", "6200-C", "6200-FAG" ], "locale_variants": {} }, { "sku": "6200-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6200-C-2HRS", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7, "static_load_kN": 2.6, "limiting_speed_rpm": 26000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6200-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Interference on a 10 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6200 with C3 clearance and re-check the residual value after mounting.", "The 62xx light series is the default general-purpose section at 10 mm bore; before upgrading to a 6310 for extra capacity, confirm the housing accepts a 30 mm OD and 9 mm width — it is not a drop-in swap.", "Heat is the enemy of the sealed 6200-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6200-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6200-2RS-FAG.", "Schaeffler HR 1 lists the lip-contact sealed version as 6200-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "The 26000 r/min mechanical limiting speed puts 6200 at the top of the HR 1 deep-groove speed range; at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6200 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6200 at 7 kN dynamic (C) and 2.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 30 g, 6200 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×30×9 mm envelope of 6200 gives a D/d ratio of 3.00 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 7/2.6 kN load ratings, mass 30 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6200-C-2HRS on the 10×30×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6200 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6200-2RS-FAG bearing?", "a": "A 6200-2RS-FAG deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6200-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 6200-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6200 and verify the residual clearance after mounting." }, { "q": "How should 6200-2RS-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the FAG suffix for a sealed 6200?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6200-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×30×9 mm ISO 15 envelope." }, { "q": "Is 6200-C-2HRS an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6200-2RS", "6200-2rs", "6200-C-2HRS", "6200-2RS-FAG" ], "locale_variants": {} }, { "sku": "6200-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6200-C-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 10, "D_mm": 30, "B_mm": 9, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 7, "static_load_kN": 2.6, "limiting_speed_rpm": 34500, "reference_speed_rpm": 26000, "weight_g": 30, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6200-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 10 by five gives the 10 mm bore; the 30 mm outside diameter and 9 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 10 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6200-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6200 against the shaft shoulder while it cools so the ring cannot creep back.", "At 10 mm bore the 62xx light series is the workhorse section; its 30×9 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Do not wash 6200-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6200-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 30 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6200-ZZ-FAG.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6200-ZZ-FAG-C3. No clearance suffix means normal CN clearance.", "Schaeffler HR 1 lists the shielded version as 6200-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 34500 r/min mechanical limiting speed puts 6200 at the top of the HR 1 deep-groove speed range (thermal reference speed 26000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6200 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6200 at 7 kN dynamic (C) and 2.6 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 30 g, 6200 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 10×30×9 mm envelope of 6200 gives a D/d ratio of 3.00 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 7/2.6 kN load ratings, mass 30 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6200-C-2Z on the 10×30×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6200 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6200; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6200-ZZ-FAG bearing?", "a": "A 6200-ZZ-FAG deep-groove ball bearing has a 10 mm bore, 30 mm outer diameter and 9 mm width (0.394 × 1.181 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6200 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6200 uses the same ISO 15 envelope (10×30×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6200-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 6200-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6200 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 6200?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6200-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×30×9 mm ISO 15 envelope." }, { "q": "Is 6200-C-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6200-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6200-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6200", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×30×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6200-ZZ", "6200-zz", "6200-C-2Z", "6200-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6300-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6300", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.6, "static_load_kN": 3.45, "limiting_speed_rpm": 31000, "reference_speed_rpm": 21100, "weight_g": 53, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 10 = 10 mm. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6300 with C3 for those conditions.", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "The open 6300-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 10×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6300-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "A 10 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6300 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 31000 r/min mechanical limiting speed puts 6300 at the top of the HR 1 deep-groove speed range (thermal reference speed 21100 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6300 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6300 at 8.6 kN dynamic (C) and 3.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 53 g, 6300 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 10×35×11 mm envelope of 6300 gives a D/d ratio of 3.50 and 12.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8.6/3.45 kN load ratings, mass 53 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6300-FAG on the 10×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6300 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6300 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6300-FAG bearing?", "a": "A 6300-FAG deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6300-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 10 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6300-FAG need?", "a": "The open 6300-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the FAG order number for an open 6300?", "a": "FAG lists the open 6300 under the bare designation 6300-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 10 mm bore envelope." }, { "q": "Is 6300-FAG an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6300", "6300-FAG" ], "locale_variants": {} }, { "sku": "6300-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6300-2RSR", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.6, "static_load_kN": 3.45, "limiting_speed_rpm": 14800, "weight_g": 57, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 10 = 10 mm. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6300-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 10 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6300 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium series gains rating at 10 mm bore through a 35 mm OD and 11 mm width; the heavier rolling elements also trade away some speed versus a 6210.", "Contact seals add drag and heat: 6300-2RS-FAG runs slower and cooler-limited than the open 6300; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6300-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6300-2RS-FAG and shows up later as two-point loaded raceway wear.", "Schaeffler HR 1 lists the lip-contact sealed version as 6300-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6300 at 14800 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 10 mm bore the 6300 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6300 at 8.6 kN dynamic (C) and 3.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 57 g, 6300 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 10×35×11 mm envelope of 6300 gives a D/d ratio of 3.50 and 12.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8.6/3.45 kN load ratings, mass 57 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6300-2RSR on the 10×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6300 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6300: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 6300-2RS-FAG bearing?", "a": "A 6300-2RS-FAG deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6300 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6300-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 6300-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6300 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 6300?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6300-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×35×11 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6300-2RSR." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6300-2RS", "6300-2rs", "6300-2RSR", "6300-2RS-FAG" ], "locale_variants": {} }, { "sku": "6300-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6300-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 10, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.6, "static_load_kN": 3.45, "limiting_speed_rpm": 26500, "reference_speed_rpm": 21100, "weight_g": 54, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6300 carries bore code 10 = 10 mm. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 10 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6300-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "material-handling equipment", "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 10 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6300 with C3 for those conditions.", "The 63xx medium section at 10 mm bore gains dynamic rating through larger rolling elements on a 35 mm OD; the penalty is mass and a lower limiting speed than the 6210 — do not specify it for speed-critical shafts.", "Do not wash 6300-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6300-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6300-ZZ-FAG-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Schaeffler HR 1 lists the shielded version as 6300-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 26500 r/min mechanical limiting speed puts 6300 at the top of the HR 1 deep-groove speed range (thermal reference speed 21100 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 10 mm bore the 6300 sits in Schaeffler's miniature range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6300 at 8.6 kN dynamic (C) and 3.45 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 54 g, 6300 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 10×35×11 mm envelope of 6300 gives a D/d ratio of 3.50 and 12.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8.6/3.45 kN load ratings, mass 54 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6300-2Z on the 10×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6300 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6300: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6300; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6300-ZZ-FAG bearing?", "a": "A 6300-ZZ-FAG deep-groove ball bearing has a 10 mm bore, 35 mm outer diameter and 11 mm width (0.394 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6300 compare with other series at the same 10 mm bore?", "a": "The '3' is the medium diameter series: 35×11 mm, 12.5 mm radial section at 10 mm bore, carrying more load than a 6210 but needing a larger housing bore and giving up some speed." }, { "q": "Are 6300 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6300 uses the same ISO 15 envelope (10×35×11 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the FAG suffix for a sealed 6300?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6300-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 10×35×11 mm ISO 15 envelope." }, { "q": "Does FAG offer 6300 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6300-2Z for normal duty." } ], "cross_ref": [ { "equiv_sku": "6300-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6300-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6300", "equiv_brand": "SKF", "level": "partial", "note": "Same 10×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=240", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6300-ZZ", "6300-zz", "6300-2Z", "6300-ZZ-FAG" ], "locale_variants": {} }, { "sku": "61801-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61801", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.92, "static_load_kN": 1.04, "limiting_speed_rpm": 50000, "reference_speed_rpm": 23500, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61801 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 21 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61801 against the shaft shoulder while it cools so the ring cannot creep back.", "The 618xx thin section at 12 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6212.", "Storage matters for open bearings: 61801-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61801 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 61801 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 50000 r/min mechanical limiting speed puts 61801 at the top of the HR 1 deep-groove speed range (thermal reference speed 23500 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 61801 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 1.92 kN dynamic load rating (C) and 1.04 kN static (C0), 61801 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 7 g, 61801 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×21×5 mm envelope of 61801 gives a D/d ratio of 1.75 and 4.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 1.92/1.04 kN load ratings, mass 7 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61801-FAG on the 12×21×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61801 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61801; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61801: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61801-FAG bearing?", "a": "A 61801-FAG deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61801 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61801 uses the same ISO 15 envelope (12×21×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61801-FAG have?", "a": "Unless a clearance suffix says otherwise, 61801-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61801 and verify the residual clearance after mounting." }, { "q": "What is the FAG order number for an open 61801?", "a": "FAG lists the open 61801 under the bare designation 61801-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 12 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61801-FAG." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61801", "61801-FAG" ], "locale_variants": {} }, { "sku": "61801-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61801-2RSR", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.92, "static_load_kN": 1.04, "limiting_speed_rpm": 18100, "weight_g": 7, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61801-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 21 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 61801-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61801 against the shaft shoulder while it cools so the ring cannot creep back.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "Heat is the enemy of the sealed 61801-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61801-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 61801-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Schaeffler HR 1 lists the lip-contact sealed version as 61801-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61801 at 18100 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 12 mm bore the 61801 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 1.92 kN dynamic load rating (C) and 1.04 kN static (C0), 61801 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 7 g, 61801 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×21×5 mm envelope of 61801 gives a D/d ratio of 1.75 and 4.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 1.92/1.04 kN load ratings, mass 7 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61801-2RSR on the 12×21×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61801 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61801: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61801 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way." ], "faq": [ { "q": "What are the dimensions of a 61801-2RS-FAG bearing?", "a": "A 61801-2RS-FAG deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61801 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61801 uses the same ISO 15 envelope (12×21×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61801-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 61801-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61801 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 61801?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61801-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×21×5 mm ISO 15 envelope." }, { "q": "Is 61801-2RSR an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-2RS", "61801-2rs", "61801-2RSR", "61801-2RS-FAG" ], "locale_variants": {} }, { "sku": "61801-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61801-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 12, "D_mm": 21, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 1.92, "static_load_kN": 1.04, "limiting_speed_rpm": 42500, "reference_speed_rpm": 23500, "weight_g": 6, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61801 carries bore code 12 = 12 mm. Outside diameter 21 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 61801-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61801 with C3 for those conditions.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 12 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6212.", "ZZ shields are non-contact: 61801-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61801-2RS for that.", "Do not wash 61801-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Never mix components between two 61801-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Schaeffler HR 1 lists the shielded version as 61801-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 42500 r/min mechanical limiting speed puts 61801 at the top of the HR 1 deep-groove speed range (thermal reference speed 23500 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 61801 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 1.92 kN dynamic load rating (C) and 1.04 kN static (C0), 61801 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 6 g, 61801 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×21×5 mm envelope of 61801 gives a D/d ratio of 1.75 and 4.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 1.92/1.04 kN load ratings, mass 6 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61801-2Z on the 12×21×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61801 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61801; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61801: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61801-ZZ-FAG bearing?", "a": "A 61801-ZZ-FAG deep-groove ball bearing has a 12 mm bore, 21 mm outer diameter and 5 mm width (0.472 × 0.827 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 61801-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 61801-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61801 and verify the residual clearance after mounting." }, { "q": "How should 61801-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the FAG suffix for a sealed 61801?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61801-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×21×5 mm ISO 15 envelope." }, { "q": "Does FAG offer 61801 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61801-2Z for normal duty." } ], "cross_ref": [ { "equiv_sku": "61801-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61801-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61801-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×21×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61801-ZZ", "61801-zz", "61801-2Z", "61801-ZZ-FAG" ], "locale_variants": {} }, { "sku": "61901-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61901", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.89, "static_load_kN": 1.46, "limiting_speed_rpm": 45000, "reference_speed_rpm": 23300, "weight_g": 12, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61901 carries bore code 12 = 12 mm. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61901 with C3 for those conditions.", "The 619xx thin section (6.0 mm section height at 12 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61901-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61901 units.", "Measure the shaft, do not trust the drawing: a 12 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61901-FAG.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "The open 61901 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 45000 r/min mechanical limiting speed puts 61901 at the top of the HR 1 deep-groove speed range (thermal reference speed 23300 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 61901 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.89 kN dynamic load rating (C) and 1.46 kN static (C0), 61901 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 12 g, 61901 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×24×6 mm envelope of 61901 gives a D/d ratio of 2.00 and 6.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 2.89/1.46 kN load ratings, mass 12 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61901-FAG on the 12×24×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61901 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61901 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61901: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61901-FAG bearing?", "a": "A 61901-FAG deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61901 bore code work?", "a": "The last two digits of 61901 are bore code 12, giving 12 × 5 = 12 mm bore. The 24 mm outside diameter and 6 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61901 mean?", "a": "A bare 61901 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the FAG order number for an open 61901?", "a": "FAG lists the open 61901 under the bare designation 61901-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 12 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61901-FAG." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901", "equiv_brand": "SKF", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61901", "61901-FAG" ], "locale_variants": {} }, { "sku": "61901-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61901-2RSR", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.89, "static_load_kN": 1.46, "limiting_speed_rpm": 16700, "weight_g": 12, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61901 carries bore code 12 = 12 mm. Outside diameter 24 mm and width 6 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61901-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61901 with C3 for those conditions.", "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Contact seals add drag and heat: 61901-2RS-FAG runs slower and cooler-limited than the open 61901; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 61901-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Shaft and housing fillets must clear the bearing chamfer so the 6 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61901-2RS-FAG-C3. No clearance suffix means normal CN clearance.", "Schaeffler HR 1 lists the lip-contact sealed version as 61901-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61901 at 16700 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 12 mm bore the 61901 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.89 kN dynamic load rating (C) and 1.46 kN static (C0), 61901 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 12 g, 61901 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×24×6 mm envelope of 61901 gives a D/d ratio of 2.00 and 6.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 2.89/1.46 kN load ratings, mass 12 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61901-2RSR on the 12×24×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61901 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 61901-2RS-FAG bearing?", "a": "A 61901-2RS-FAG deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61901-2RS-FAG need?", "a": "61901-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61901 with a housing grease fitting instead." }, { "q": "How does the 61901 bore code work?", "a": "The last two digits of 61901 are bore code 12, giving 12 × 5 = 12 mm bore. The 24 mm outside diameter and 6 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the FAG suffix for a sealed 61901?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61901-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×24×6 mm ISO 15 envelope." }, { "q": "Does FAG offer 61901 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61901-2RSR for normal duty." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61901-2RS", "61901-2rs", "61901-2RSR", "61901-2RS-FAG" ], "locale_variants": {} }, { "sku": "61901-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61901-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 12, "D_mm": 24, "B_mm": 6, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.89, "static_load_kN": 1.46, "limiting_speed_rpm": 38000, "reference_speed_rpm": 23300, "weight_g": 12, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61901-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 24 mm outside diameter and 6 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61901-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61901 with C3 clearance and re-check the residual value after mounting.", "The 619xx thin section at 12 mm bore (6.0 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61901-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61901-2RS for that.", "Shielded 61901-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61901-ZZ-FAG-C3. No clearance suffix means normal CN clearance.", "Schaeffler HR 1 lists the shielded version as 61901-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 38000 r/min mechanical limiting speed puts 61901 at the top of the HR 1 deep-groove speed range (thermal reference speed 23300 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 61901 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.89 kN dynamic load rating (C) and 1.46 kN static (C0), 61901 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 12 g, 61901 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×24×6 mm envelope of 61901 gives a D/d ratio of 2.00 and 6.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 2.89/1.46 kN load ratings, mass 12 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61901-2Z on the 12×24×6 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61901 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61901; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 61901-ZZ-FAG bearing?", "a": "A 61901-ZZ-FAG deep-groove ball bearing has a 12 mm bore, 24 mm outer diameter and 6 mm width (0.472 × 0.945 × 0.236 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61901-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 12 mm bore?", "a": "619 is a thin section one step above 618: 24×6 mm with a 6.0 mm radial section at 12 mm bore; a 6212 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the FAG suffix for a sealed 61901?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61901-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×24×6 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61901-2Z." } ], "cross_ref": [ { "equiv_sku": "61901-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61901-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61901", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×24×6 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61901-ZZ", "61901-zz", "61901-2Z", "61901-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6001-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6001-C", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.9, "static_load_kN": 2.37, "limiting_speed_rpm": 42500, "reference_speed_rpm": 26000, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6001 carries bore code 12 = 12 mm. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6001 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "The open 6001-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 12×28×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6001 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 8 mm-wide ring of 6001-FAG drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6001 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 42500 r/min mechanical limiting speed puts 6001 at the top of the HR 1 deep-groove speed range (thermal reference speed 26000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 6001 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6001 at 5.9 kN dynamic (C) and 2.37 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 19 g, 6001 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×28×8 mm envelope of 6001 gives a D/d ratio of 2.33 and 8.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 5.9/2.37 kN load ratings, mass 19 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6001-C on the 12×28×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6001 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6001; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6001-FAG bearing?", "a": "A 6001-FAG deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6001 bore code work?", "a": "The last two digits of 6001 are bore code 12, giving 12 × 5 = 12 mm bore. The 28 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6001 mean?", "a": "A bare 6001 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the FAG order number for an open 6001?", "a": "FAG lists the open 6001 under the bare designation 6001-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 12 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6001-C." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6001", "6001-C", "6001-FAG" ], "locale_variants": {} }, { "sku": "6001-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6001-C-2HRS", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.9, "static_load_kN": 2.37, "limiting_speed_rpm": 24900, "weight_g": 20, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6001 carries bore code 12 = 12 mm. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6001-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6001 against the shaft shoulder while it cools so the ring cannot creep back.", "The 60xx extra-light section at 12 mm bore uses a smaller 28 mm OD than a 6212; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Heat is the enemy of the sealed 6001-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6001-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6000-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6001-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Schaeffler HR 1 lists the lip-contact sealed version as 6001-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6001 at 24900 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 12 mm bore the 6001 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6001 at 5.9 kN dynamic (C) and 2.37 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 20 g, 6001 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×28×8 mm envelope of 6001 gives a D/d ratio of 2.33 and 8.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 5.9/2.37 kN load ratings, mass 20 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6001-C-2HRS on the 12×28×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6001 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6001 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 6001-2RS-FAG bearing?", "a": "A 6001-2RS-FAG deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6001 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6001 uses the same ISO 15 envelope (12×28×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6001-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 6001-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6001 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 6001?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6001-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×28×8 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6001-C-2HRS." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6001-2RS", "6001-2rs", "6001-C-2HRS", "6001-2RS-FAG" ], "locale_variants": {} }, { "sku": "6001-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6001-C-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 12, "D_mm": 28, "B_mm": 8, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.9, "static_load_kN": 2.37, "limiting_speed_rpm": 36000, "reference_speed_rpm": 26000, "weight_g": 21, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6001 carries bore code 12 = 12 mm. Outside diameter 28 mm and width 8 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6001-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6001 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 12 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6212 before committing to the smaller envelope.", "ZZ shields are non-contact: 6001-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6001-2RS for that.", "Shielded 6001-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 28 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6001-ZZ-FAG.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Schaeffler HR 1 lists the shielded version as 6001-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 36000 r/min mechanical limiting speed puts 6001 at the top of the HR 1 deep-groove speed range (thermal reference speed 26000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 6001 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6001 at 5.9 kN dynamic (C) and 2.37 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 21 g, 6001 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×28×8 mm envelope of 6001 gives a D/d ratio of 2.33 and 8.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 5.9/2.37 kN load ratings, mass 21 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6001-C-2Z on the 12×28×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6001 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6001: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 6001-ZZ-FAG bearing?", "a": "A 6001-ZZ-FAG deep-groove ball bearing has a 12 mm bore, 28 mm outer diameter and 8 mm width (0.472 × 1.102 × 0.315 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6001 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6001 uses the same ISO 15 envelope (12×28×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6001-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 6001-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6001 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 6001?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6001-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×28×8 mm ISO 15 envelope." }, { "q": "Is 6001-C-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6001-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6001-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6001", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×28×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6001-ZZ", "6001-zz", "6001-C-2Z", "6001-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6201-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6201-C", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8, "static_load_kN": 3.1, "limiting_speed_rpm": 37000, "reference_speed_rpm": 24600, "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6201 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 12 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6201 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "The open 6201-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 12×32×10 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6201 units.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 6201-FAG drags the lip and overheats it.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 6201 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 37000 r/min mechanical limiting speed puts 6201 at the top of the HR 1 deep-groove speed range (thermal reference speed 24600 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 6201 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6201 at 8 kN dynamic (C) and 3.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 37 g, 6201 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×32×10 mm envelope of 6201 gives a D/d ratio of 2.67 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8/3.1 kN load ratings, mass 37 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6201-C on the 12×32×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6201 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 6201-FAG bearing?", "a": "A 6201-FAG deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 6201-FAG need?", "a": "The open 6201-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 6201 bore code work?", "a": "The last two digits of 6201 are bore code 12, giving 12 × 5 = 12 mm bore. The 32 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the FAG order number for an open 6201?", "a": "FAG lists the open 6201 under the bare designation 6201-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 12 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6201-C." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6201", "6201-C", "6201-FAG" ], "locale_variants": {} }, { "sku": "6201-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6201-C-2HRS", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8, "static_load_kN": 3.1, "limiting_speed_rpm": 22500, "weight_g": 36, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6201-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 32 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6201-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6201 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "Contact seals add drag and heat: 6201-2RS-FAG runs slower and cooler-limited than the open 6201; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6201-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 6201-2RS-FAG drags the lip and overheats it.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Schaeffler HR 1 lists the lip-contact sealed version as 6201-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6201 at 22500 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 12 mm bore the 6201 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6201 at 8 kN dynamic (C) and 3.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 36 g, 6201 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×32×10 mm envelope of 6201 gives a D/d ratio of 2.67 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8/3.1 kN load ratings, mass 36 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6201-C-2HRS on the 12×32×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6201 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6201 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6201-2RS-FAG bearing?", "a": "A 6201-2RS-FAG deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6201-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 12 mm bore?", "a": "The '2' is the light diameter series: 32×10 mm with a 10.0 mm radial section at 12 mm bore. A 6312 on the same bore is larger and higher-rated; a 6012 is smaller and lower-rated." }, { "q": "What is the FAG suffix for a sealed 6201?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6201-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×32×10 mm ISO 15 envelope." }, { "q": "Does FAG offer 6201 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6201-C-2HRS for normal duty." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6201-2RS", "6201-2rs", "6201-C-2HRS", "6201-2RS-FAG" ], "locale_variants": {} }, { "sku": "6201-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6201-C-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 12, "D_mm": 32, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8, "static_load_kN": 3.1, "limiting_speed_rpm": 31500, "reference_speed_rpm": 24600, "weight_g": 36, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6201 carries bore code 12 = 12 mm. Outside diameter 32 mm and width 10 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6201-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6201 with C3 for those conditions.", "The 62xx light series is the default general-purpose section at 12 mm bore; before upgrading to a 6312 for extra capacity, confirm the housing accepts a 32 mm OD and 10 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6201-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6201-2RS for that.", "Shielded 6201-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6201-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Do not quieten a noisy bearing by preloading it: the 6200-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Schaeffler HR 1 lists the shielded version as 6201-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 31500 r/min mechanical limiting speed puts 6201 at the top of the HR 1 deep-groove speed range (thermal reference speed 24600 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 6201 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6201 at 8 kN dynamic (C) and 3.1 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 36 g, 6201 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 12×32×10 mm envelope of 6201 gives a D/d ratio of 2.67 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8/3.1 kN load ratings, mass 36 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6201-C-2Z on the 12×32×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6201 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6201-ZZ-FAG bearing?", "a": "A 6201-ZZ-FAG deep-groove ball bearing has a 12 mm bore, 32 mm outer diameter and 10 mm width (0.472 × 1.26 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6201 bore code work?", "a": "The last two digits of 6201 are bore code 12, giving 12 × 5 = 12 mm bore. The 32 mm outside diameter and 10 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 6201-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the FAG suffix for a sealed 6201?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6201-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×32×10 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6201-C-2Z." } ], "cross_ref": [ { "equiv_sku": "6201-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6201-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6201", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×32×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6201-ZZ", "6201-zz", "6201-C-2Z", "6201-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6301-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6301-C", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.5, "static_load_kN": 4.2, "limiting_speed_rpm": 31000, "reference_speed_rpm": 21900, "weight_g": 62, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6301 carries bore code 12 = 12 mm. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 12 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6301 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "The open 6301-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 12×37×12 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6301-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Vibration during standstill brinells the raceways of a 12 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 37 mm OD should be round within IT7; an oval bore pinches the outer ring of 6301-FAG and shows up later as two-point loaded raceway wear.", "The open 6301 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 31000 r/min mechanical limiting speed puts 6301 at the top of the HR 1 deep-groove speed range (thermal reference speed 21900 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 6301 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6301 at 11.5 kN dynamic (C) and 4.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 62 g, 6301 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 12×37×12 mm envelope of 6301 gives a D/d ratio of 3.08 and 12.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 11.5/4.2 kN load ratings, mass 62 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6301-C on the 12×37×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6301 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6301-FAG bearing?", "a": "A 6301-FAG deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6301 mean?", "a": "A bare 6301 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 12 mm bore?", "a": "The '3' is the medium diameter series: 37×12 mm, 12.5 mm radial section at 12 mm bore, carrying more load than a 6212 but needing a larger housing bore and giving up some speed." }, { "q": "What is the FAG order number for an open 6301?", "a": "FAG lists the open 6301 under the bare designation 6301-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 12 mm bore envelope." }, { "q": "Is 6301-C an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6301", "6301-C", "6301-FAG" ], "locale_variants": {} }, { "sku": "6301-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6301-C-2HRS", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.5, "static_load_kN": 4.2, "limiting_speed_rpm": 21700, "weight_g": 59, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6301-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 12 by five gives the 12 mm bore; the 37 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 12 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6301-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6301 with C3 for those conditions.", "The 63xx medium section at 12 mm bore gains dynamic rating through larger rolling elements on a 37 mm OD; the penalty is mass and a lower limiting speed than the 6212 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6301-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6301-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6300-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Schaeffler HR 1 lists the lip-contact sealed version as 6301-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6301 at 21700 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 12 mm bore the 6301 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6301 at 11.5 kN dynamic (C) and 4.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 59 g, 6301 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 12×37×12 mm envelope of 6301 gives a D/d ratio of 3.08 and 12.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 11.5/4.2 kN load ratings, mass 59 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6301-C-2HRS on the 12×37×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6301 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6301-2RS-FAG bearing?", "a": "A 6301-2RS-FAG deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6301-2RS-FAG need?", "a": "6301-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6301 with a housing grease fitting instead." }, { "q": "How does the 6301 bore code work?", "a": "The last two digits of 6301 are bore code 12, giving 12 × 5 = 12 mm bore. The 37 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the FAG suffix for a sealed 6301?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6301-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×37×12 mm ISO 15 envelope." }, { "q": "Is 6301-C-2HRS an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6301-2RS", "6301-2rs", "6301-C-2HRS", "6301-2RS-FAG" ], "locale_variants": {} }, { "sku": "6301-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6301-C-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 12, "D_mm": 37, "B_mm": 12, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11.5, "static_load_kN": 4.2, "limiting_speed_rpm": 26500, "reference_speed_rpm": 21900, "weight_g": 59, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6301 carries bore code 12 = 12 mm. Outside diameter 37 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 12 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6301-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 12 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6301 with C3 for those conditions.", "The 63xx medium series gains rating at 12 mm bore through a 37 mm OD and 12 mm width; the heavier rolling elements also trade away some speed versus a 6212.", "ZZ shields are non-contact: 6301-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6301-2RS for that.", "Do not wash 6301-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 12 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Schaeffler HR 1 lists the shielded version as 6301-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 26500 r/min mechanical limiting speed puts 6301 at the top of the HR 1 deep-groove speed range (thermal reference speed 21900 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 12 mm bore the 6301 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6301 at 11.5 kN dynamic (C) and 4.2 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 59 g, 6301 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 12×37×12 mm envelope of 6301 gives a D/d ratio of 3.08 and 12.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 11.5/4.2 kN load ratings, mass 59 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6301-C-2Z on the 12×37×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6301 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6301; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6301-ZZ-FAG bearing?", "a": "A 6301-ZZ-FAG deep-groove ball bearing has a 12 mm bore, 37 mm outer diameter and 12 mm width (0.472 × 1.457 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6301-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 6301-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6301 and verify the residual clearance after mounting." }, { "q": "How should 6301-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 12 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the FAG suffix for a sealed 6301?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6301-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 12×37×12 mm ISO 15 envelope." }, { "q": "Is 6301-C-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6301-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6301-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6301", "equiv_brand": "SKF", "level": "partial", "note": "Same 12×37×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=242", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6301-ZZ", "6301-zz", "6301-C-2Z", "6301-ZZ-FAG" ], "locale_variants": {} }, { "sku": "61802-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61802", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.07, "static_load_kN": 1.26, "limiting_speed_rpm": 45000, "reference_speed_rpm": 19200, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 15 = 15 mm. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61802 with C3 clearance and re-check the residual value after mounting.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 15 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "The open 61802-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 15×24×5 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61802 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61802-FAG-C3. No clearance suffix means normal CN clearance.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "The open 61802 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 45000 r/min mechanical limiting speed puts 61802 at the top of the HR 1 deep-groove speed range (thermal reference speed 19200 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 61802 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.07 kN dynamic load rating (C) and 1.26 kN static (C0), 61802 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 8 g, 61802 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×24×5 mm envelope of 61802 gives a D/d ratio of 1.60 and 4.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.", "The 2.07/1.26 kN load ratings, mass 8 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61802-FAG on the 15×24×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61802 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61802: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61802-FAG bearing?", "a": "A 61802-FAG deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 61802 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61802 uses the same ISO 15 envelope (15×24×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 61802-FAG have?", "a": "Unless a clearance suffix says otherwise, 61802-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61802 and verify the residual clearance after mounting." }, { "q": "What is the FAG order number for an open 61802?", "a": "FAG lists the open 61802 under the bare designation 61802-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 15 mm bore envelope." }, { "q": "Is 61802-FAG an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61802", "61802-FAG" ], "locale_variants": {} }, { "sku": "61802-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61802-2RSR", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.07, "static_load_kN": 1.26, "limiting_speed_rpm": 15000, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61802 carries bore code 15 = 15 mm. Outside diameter 24 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61802-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61802 with C3 for those conditions.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 15 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6215.", "Contact seals add drag and heat: 61802-2RS-FAG runs slower and cooler-limited than the open 61802; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61802-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 61802-2RS-FAG-C3. No clearance suffix means normal CN clearance.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Schaeffler HR 1 lists the lip-contact sealed version as 61802-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61802 at 15000 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 15 mm bore the 61802 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.07 kN dynamic load rating (C) and 1.26 kN static (C0), 61802 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 8 g, 61802 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×24×5 mm envelope of 61802 gives a D/d ratio of 1.60 and 4.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.", "The 2.07/1.26 kN load ratings, mass 8 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61802-2RSR on the 15×24×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61802 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61802 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 61802-2RS-FAG bearing?", "a": "A 61802-2RS-FAG deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61802-2RS-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61802-2RS-FAG need?", "a": "61802-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61802 with a housing grease fitting instead." }, { "q": "What is the FAG suffix for a sealed 61802?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61802-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×24×5 mm ISO 15 envelope." }, { "q": "Does FAG offer 61802 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61802-2RSR for normal duty." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-2RS", "61802-2rs", "61802-2RSR", "61802-2RS-FAG" ], "locale_variants": {} }, { "sku": "61802-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61802-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 15, "D_mm": 24, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.07, "static_load_kN": 1.26, "limiting_speed_rpm": 38000, "reference_speed_rpm": 19200, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "61802-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 24 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61802-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 61802 with C3 clearance and re-check the residual value after mounting.", "The 618xx thin section at 15 mm bore has only a 4.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6215.", "ZZ shields are non-contact: 61802-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61802-2RS for that.", "Shielded 61802-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 5 mm-wide ring of 61802-ZZ-FAG drags the lip and overheats it.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Schaeffler HR 1 lists the shielded version as 61802-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 38000 r/min mechanical limiting speed puts 61802 at the top of the HR 1 deep-groove speed range (thermal reference speed 19200 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 61802 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.07 kN dynamic load rating (C) and 1.26 kN static (C0), 61802 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "The 15×24×5 mm envelope of 61802 gives a D/d ratio of 1.60 and 4.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.", "The 2.07/1.26 kN load ratings here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61802-2Z on the 15×24×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61802 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 61802-ZZ-FAG bearing?", "a": "A 61802-ZZ-FAG deep-groove ball bearing has a 15 mm bore, 24 mm outer diameter and 5 mm width (0.591 × 0.945 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61802-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61802-ZZ-FAG need?", "a": "61802-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the FAG suffix for a sealed 61802?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61802-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×24×5 mm ISO 15 envelope." }, { "q": "Is 61802-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "61802-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61802-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61802-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×24×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61802-ZZ", "61802-zz", "61802-2Z", "61802-ZZ-FAG" ], "locale_variants": {} }, { "sku": "61902-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61902", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.33, "static_load_kN": 2.25, "limiting_speed_rpm": 38000, "reference_speed_rpm": 20600, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 15 = 15 mm. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61902 with C3 for those conditions.", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Storage matters for open bearings: 61902-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61902 units.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61902-FAG.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 7 mm-wide ring of 61902-FAG drags the lip and overheats it.", "The open 61902 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 38000 r/min mechanical limiting speed puts 61902 at the top of the HR 1 deep-groove speed range (thermal reference speed 20600 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 61902 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 4.33 kN dynamic load rating (C) and 2.25 kN static (C0), 61902 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 19 g, 61902 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×28×7 mm envelope of 61902 gives a D/d ratio of 1.87 and 6.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 4.33/2.25 kN load ratings, mass 19 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61902-FAG on the 15×28×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61902 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61902; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61902 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way." ], "faq": [ { "q": "What are the dimensions of a 61902-FAG bearing?", "a": "A 61902-FAG deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What internal clearance does 61902-FAG have?", "a": "Unless a clearance suffix says otherwise, 61902-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting." }, { "q": "How should 61902-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the FAG order number for an open 61902?", "a": "FAG lists the open 61902 under the bare designation 61902-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 15 mm bore envelope." }, { "q": "Does FAG offer 61902 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61902-FAG for normal duty." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61902", "61902-FAG" ], "locale_variants": {} }, { "sku": "61902-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61902-2RSR", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.33, "static_load_kN": 2.25, "limiting_speed_rpm": 14200, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61902 carries bore code 15 = 15 mm. Outside diameter 28 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61902-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 61902 with C3 for those conditions.", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Heat is the enemy of the sealed 61902-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 61902-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Schaeffler HR 1 lists the lip-contact sealed version as 61902-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61902 at 14200 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 15 mm bore the 61902 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 4.33 kN dynamic load rating (C) and 2.25 kN static (C0), 61902 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 19 g, 61902 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×28×7 mm envelope of 61902 gives a D/d ratio of 1.87 and 6.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 4.33/2.25 kN load ratings, mass 19 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61902-2RSR on the 15×28×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61902 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61902: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 61902-2RS-FAG bearing?", "a": "A 61902-2RS-FAG deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 61902-2RS-FAG need?", "a": "61902-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61902 with a housing grease fitting instead." }, { "q": "How does the 61902 bore code work?", "a": "The last two digits of 61902 are bore code 15, giving 15 × 5 = 15 mm bore. The 28 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the FAG suffix for a sealed 61902?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61902-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×28×7 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61902-2RSR." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61902-2RS", "61902-2rs", "61902-2RSR", "61902-2RS-FAG" ], "locale_variants": {} }, { "sku": "61902-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61902-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 15, "D_mm": 28, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.33, "static_load_kN": 2.25, "limiting_speed_rpm": 32000, "reference_speed_rpm": 20600, "weight_g": 19, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61902-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61902-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "clutch and transmission assemblies", "robotics and automation joints", "lay shafts and idler shafts", "textile machinery" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61902 against the shaft shoulder while it cools so the ring cannot creep back.", "The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "ZZ shields are non-contact: 61902-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61902-2RS for that.", "Shielded 61902-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "A 15 mm bore listing showing the right d/D/B but no standard or precision-class reference may be a loose-tolerance import; measure bore/OD spread before fitting it to a machined shaft.", "Schaeffler HR 1 lists the shielded version as 61902-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 32000 r/min mechanical limiting speed puts 61902 at the top of the HR 1 deep-groove speed range (thermal reference speed 20600 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 61902 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 4.33 kN dynamic load rating (C) and 2.25 kN static (C0), 61902 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 19 g, 61902 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×28×7 mm envelope of 61902 gives a D/d ratio of 1.87 and 6.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 4.33/2.25 kN load ratings, mass 19 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61902-2Z on the 15×28×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61902 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61902 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61902: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61902-ZZ-FAG bearing?", "a": "A 61902-ZZ-FAG deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 61902-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 61900 compare with other series at the same 15 mm bore?", "a": "619 is a thin section one step above 618: 28×7 mm with a 6.5 mm radial section at 15 mm bore; a 6215 on the same bore is substantially larger and more heavily rated." }, { "q": "What is the FAG suffix for a sealed 61902?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61902-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×28×7 mm ISO 15 envelope." }, { "q": "Does FAG offer 61902 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61902-2Z for normal duty." } ], "cross_ref": [ { "equiv_sku": "61902-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61902-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61902", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×28×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61902-ZZ", "61902-zz", "61902-2Z", "61902-ZZ-FAG" ], "locale_variants": {} }, { "sku": "16002", "brand": "FAG", "manufacturer_designation": "FAG 16002", "series": "16000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 5.59, "static_load_kN": 2.84, "limiting_speed_rpm": 33500, "reference_speed_rpm": 20000, "weight_g": 25, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "16002 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 15 by five gives the 15 mm bore; the 32 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 16002 with C3 clearance and re-check the residual value after mounting.", "Because the 160xx narrow section shares the 32 mm OD of the 6015 at 15 mm bore but is only 8 mm wide, a housing machined for the wider bearing needs a spacer or relocated circlip — never assume width interchangeability.", "The open 16002 has no lubricant retention: grease escapes and contaminants migrate straight into the 15×32×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16002 units.", "Do not quieten a noisy bearing by preloading it: the 16000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Shaft and housing fillets must clear the bearing chamfer so the 8 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The open 16002 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 33500 r/min mechanical limiting speed puts 16002 at the top of the HR 1 deep-groove speed range (thermal reference speed 20000 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 16002 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 16002 at 5.59 kN dynamic (C) and 2.84 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 25 g, 16002 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×32×8 mm envelope of 16002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 5.59/2.84 kN load ratings, mass 25 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16002 on the 15×32×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16002 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.", "Schaeffler's medias/eKatalog is the live source for the current execution of 16002: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 16002 bearing?", "a": "A 16002 deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 8 mm width (0.591 × 1.26 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 16002 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 16002 uses the same ISO 15 envelope (15×32×8 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 16002 have?", "a": "Unless a clearance suffix says otherwise, 16002 is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 16002 and verify the residual clearance after mounting." }, { "q": "What is the FAG order number for an open 16002?", "a": "FAG lists the open 16002 under the bare designation 16002; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 15 mm bore envelope." }, { "q": "Does FAG offer 16002 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 16002 for normal duty." } ], "cross_ref": [ { "equiv_sku": "16002-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×32×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "16002-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16002" ], "locale_variants": {} }, { "sku": "6002-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6002-C", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.3, "static_load_kN": 2.85, "limiting_speed_rpm": 37000, "reference_speed_rpm": 23200, "weight_g": 27, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 15 = 15 mm. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "edge loading from shaft deflection or housing misalignment", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6002 with C3 clearance and re-check the residual value after mounting.", "The 60xx extra-light section at 15 mm bore uses a smaller 32 mm OD than a 6215; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Storage matters for open bearings: 6002-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6002 units.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6002-FAG and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 15 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6002-FAG.", "The open 6002 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 37000 r/min mechanical limiting speed puts 6002 at the top of the HR 1 deep-groove speed range (thermal reference speed 23200 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 6002 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6002 at 6.3 kN dynamic (C) and 2.85 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 27 g, 6002 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×32×9 mm envelope of 6002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 6.3/2.85 kN load ratings, mass 27 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6002-C on the 15×32×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6002 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6002; the standard NBR lip is the economical general-duty choice, not the high-temperature one.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6002 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way." ], "faq": [ { "q": "What are the dimensions of a 6002-FAG bearing?", "a": "A 6002-FAG deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6002 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6002 uses the same ISO 15 envelope (15×32×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What is the FAG order number for an open 6002?", "a": "FAG lists the open 6002 under the bare designation 6002-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 15 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6002-C." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6002", "6002-C", "6002-FAG" ], "locale_variants": {} }, { "sku": "6002-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6002-C-2HRS", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.3, "static_load_kN": 2.85, "limiting_speed_rpm": 20300, "weight_g": 29, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 15 = 15 mm. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6002-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6002 with C3 for those conditions.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Contact seals add drag and heat: 6002-2RS-FAG runs slower and cooler-limited than the open 6002; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6002-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "The housing bore for the 32 mm OD should be round within IT7; an oval bore pinches the outer ring of 6002-2RS-FAG and shows up later as two-point loaded raceway wear.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6002-2RS-FAG.", "Schaeffler HR 1 lists the lip-contact sealed version as 6002-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6002 at 20300 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 15 mm bore the 6002 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6002 at 6.3 kN dynamic (C) and 2.85 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 29 g, 6002 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×32×9 mm envelope of 6002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 6.3/2.85 kN load ratings, mass 29 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6002-C-2HRS on the 15×32×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6002 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6002 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units." ], "faq": [ { "q": "What are the dimensions of a 6002-2RS-FAG bearing?", "a": "A 6002-2RS-FAG deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What internal clearance does 6002-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 6002-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6002 and verify the residual clearance after mounting." }, { "q": "How should 6002-2RS-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the FAG suffix for a sealed 6002?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6002-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×32×9 mm ISO 15 envelope." }, { "q": "Is 6002-C-2HRS an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6002-2RS", "6002-2rs", "6002-C-2HRS", "6002-2RS-FAG" ], "locale_variants": {} }, { "sku": "6002-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6002-C-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 15, "D_mm": 32, "B_mm": 9, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.3, "static_load_kN": 2.85, "limiting_speed_rpm": 31500, "reference_speed_rpm": 23200, "weight_g": 29, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6000-series (diameter series 0 of ISO 15) the last two digits encode the bore: 6002 carries bore code 15 = 15 mm. Outside diameter 32 mm and width 9 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6002-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6002 with C3 clearance and re-check the residual value after mounting.", "Choosing the 60xx extra-light section saves radial space at 15 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6215 before committing to the smaller envelope.", "Do not wash 6002-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6002-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Do not quieten a noisy bearing by preloading it: the 6000-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 32 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6002-ZZ-FAG.", "Schaeffler HR 1 lists the shielded version as 6002-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 31500 r/min mechanical limiting speed puts 6002 at the top of the HR 1 deep-groove speed range (thermal reference speed 23200 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 6002 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6002 at 6.3 kN dynamic (C) and 2.85 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 29 g, 6002 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×32×9 mm envelope of 6002 gives a D/d ratio of 2.13 and 8.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 6.3/2.85 kN load ratings, mass 29 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6002-C-2Z on the 15×32×9 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6002 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6002: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 6002-ZZ-FAG bearing?", "a": "A 6002-ZZ-FAG deep-groove ball bearing has a 15 mm bore, 32 mm outer diameter and 9 mm width (0.591 × 1.26 × 0.354 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 15 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (32×9 mm, 8.5 mm radial section) at 15 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6002 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6002 uses the same ISO 15 envelope (15×32×9 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the FAG suffix for a sealed 6002?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6002-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×32×9 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6002-C-2Z." } ], "cross_ref": [ { "equiv_sku": "6002-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6002-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6002", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×32×9 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6002-ZZ", "6002-zz", "6002-C-2Z", "6002-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6202-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6202-C", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.9, "static_load_kN": 3.75, "limiting_speed_rpm": 33000, "reference_speed_rpm": 21900, "weight_g": 42, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers", "conveyor drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6202 against the shaft shoulder while it cools so the ring cannot creep back.", "The 62xx light series is the default general-purpose section at 15 mm bore; before upgrading to a 6315 for extra capacity, confirm the housing accepts a 35 mm OD and 11 mm width — it is not a drop-in swap.", "The open 6202-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 15×35×11 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6202-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 35 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6202-FAG.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The open 6202 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 33000 r/min mechanical limiting speed puts 6202 at the top of the HR 1 deep-groove speed range (thermal reference speed 21900 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 6202 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6202 at 8.9 kN dynamic (C) and 3.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 42 g, 6202 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×35×11 mm envelope of 6202 gives a D/d ratio of 2.33 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8.9/3.75 kN load ratings, mass 42 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6202-C on the 15×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6202 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 6202-FAG bearing?", "a": "A 6202-FAG deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 6202 bore code work?", "a": "The last two digits of 6202 are bore code 15, giving 15 × 5 = 15 mm bore. The 35 mm outside diameter and 11 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 6202 mean?", "a": "A bare 6202 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the FAG order number for an open 6202?", "a": "FAG lists the open 6202 under the bare designation 6202-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 15 mm bore envelope." }, { "q": "Is 6202-C an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6202", "6202-C", "6202-FAG" ], "locale_variants": {} }, { "sku": "6202-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6202-C-2HRS", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.9, "static_load_kN": 3.75, "limiting_speed_rpm": 19400, "weight_g": 44, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6202-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 35 mm outside diameter and 11 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6202-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6202 with C3 clearance and re-check the residual value after mounting.", "At 15 mm bore the 62xx light series is the workhorse section; its 35×11 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6202-2RS-FAG runs slower and cooler-limited than the open 6202; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6202-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 6200-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 6202-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Schaeffler HR 1 lists the lip-contact sealed version as 6202-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6202 at 19400 r/min mechanical limiting speed — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 15 mm bore the 6202 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6202 at 8.9 kN dynamic (C) and 3.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 44 g, 6202 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×35×11 mm envelope of 6202 gives a D/d ratio of 2.33 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8.9/3.75 kN load ratings, mass 44 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6202-C-2HRS on the 15×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6202 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6202: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 6202-2RS-FAG bearing?", "a": "A 6202-2RS-FAG deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What does the 2RS suffix on 6202-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "How does the 6200 compare with other series at the same 15 mm bore?", "a": "The '2' is the light diameter series: 35×11 mm with a 10.0 mm radial section at 15 mm bore. A 6315 on the same bore is larger and higher-rated; a 6015 is smaller and lower-rated." }, { "q": "What is the FAG suffix for a sealed 6202?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6202-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×35×11 mm ISO 15 envelope." }, { "q": "Does FAG offer 6202 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6202-C-2HRS for normal duty." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6202-2RS", "6202-2rs", "6202-C-2HRS", "6202-2RS-FAG" ], "locale_variants": {} }, { "sku": "6202-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6202-C-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 8.9, "static_load_kN": 3.75, "limiting_speed_rpm": 28000, "reference_speed_rpm": 21900, "weight_g": 44, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6202 carries bore code 15 = 15 mm. Outside diameter 35 mm and width 11 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 15 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6202-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "industrial fans", "industrial electric motors", "centrifugal and positive-displacement pumps", "gearboxes and speed reducers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6202 against the shaft shoulder while it cools so the ring cannot creep back.", "At 15 mm bore the 62xx light series is the workhorse section; its 35×11 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "ZZ shields are non-contact: 6202-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6202-2RS for that.", "Shielded 6202-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6202-ZZ-FAG and shows up later as two-point loaded raceway wear.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 11 mm-wide ring of 6202-ZZ-FAG drags the lip and overheats it.", "Schaeffler HR 1 lists the shielded version as 6202-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 28000 r/min mechanical limiting speed puts 6202 at the top of the HR 1 deep-groove speed range (thermal reference speed 21900 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 6202 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6202 at 8.9 kN dynamic (C) and 3.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 44 g, 6202 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 15×35×11 mm envelope of 6202 gives a D/d ratio of 2.33 and 10.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 8.9/3.75 kN load ratings, mass 44 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6202-C-2Z on the 15×35×11 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6202 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6202 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6202; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6202-ZZ-FAG bearing?", "a": "A 6202-ZZ-FAG deep-groove ball bearing has a 15 mm bore, 35 mm outer diameter and 11 mm width (0.591 × 1.378 × 0.433 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 6202-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6202-ZZ-FAG need?", "a": "6202-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the FAG suffix for a sealed 6202?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6202-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×35×11 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6202-C-2Z." } ], "cross_ref": [ { "equiv_sku": "6202-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6202-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6202", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×35×11 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6202-ZZ", "6202-zz", "6202-C-2Z", "6202-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6302-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6302-C", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13.3, "static_load_kN": 5.3, "limiting_speed_rpm": 27500, "reference_speed_rpm": 19200, "weight_g": 81, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "brinelling from static overload or hammering during mounting", "false brinelling from vibration while the shaft is stationary" ], "pitfalls": [ "Temperature rise and interference fits consume internal clearance on this 15 mm bore: a CN bearing on a tight, hot shaft can lose all residual clearance — size 6302 with C3 for those conditions.", "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "Storage matters for open bearings: 6302-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6300-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6302 units.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6302-FAG-C3. No clearance suffix means normal CN clearance.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 6302-FAG.", "The open 6302 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 27500 r/min mechanical limiting speed puts 6302 at the top of the HR 1 deep-groove speed range (thermal reference speed 19200 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 15 mm bore the 6302 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6302 at 13.3 kN dynamic (C) and 5.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 81 g, 6302 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 15×42×13 mm envelope of 6302 gives a D/d ratio of 2.80 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 13.3/5.3 kN load ratings, mass 81 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6302-C on the 15×42×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6302 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6302; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6302-FAG bearing?", "a": "A 6302-FAG deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6302 mean?", "a": "A bare 6302 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6300 compare with other series at the same 15 mm bore?", "a": "The '3' is the medium diameter series: 42×13 mm, 13.5 mm radial section at 15 mm bore, carrying more load than a 6215 but needing a larger housing bore and giving up some speed." }, { "q": "What is the FAG order number for an open 6302?", "a": "FAG lists the open 6302 under the bare designation 6302-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 15 mm bore envelope." }, { "q": "Is 6302-C an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6302", "6302-C", "6302-FAG" ], "locale_variants": {} }, { "sku": "6302-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6302-C-2HRS", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13.3, "static_load_kN": 5.3, "limiting_speed_rpm": 17700, "weight_g": 83, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6302-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "conveyor drives", "material-handling equipment", "industrial fans", "industrial electric motors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Interference on a 15 mm shaft plus running heat consumes radial clearance: where the shaft runs hot or the fit is tight, order 6302 with C3 clearance and re-check the residual value after mounting.", "The 63xx medium section at 15 mm bore gains dynamic rating through larger rolling elements on a 42 mm OD; the penalty is mass and a lower limiting speed than the 6215 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6302-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6302-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 13 mm-wide ring of 6302-2RS-FAG drags the lip and overheats it.", "Schaeffler HR 1 lists the lip-contact sealed version as 6302-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6302 at 17700 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 15 mm bore the 6302 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6302 at 13.3 kN dynamic (C) and 5.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 83 g, 6302 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 15×42×13 mm envelope of 6302 gives a D/d ratio of 2.80 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 13.3/5.3 kN load ratings, mass 83 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6302-C-2HRS on the 15×42×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6302 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6302: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6302-2RS-FAG bearing?", "a": "A 6302-2RS-FAG deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "What lubrication does 6302-2RS-FAG need?", "a": "6302-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 6302 with a housing grease fitting instead." }, { "q": "How does the 6302 bore code work?", "a": "The last two digits of 6302 are bore code 15, giving 15 × 5 = 15 mm bore. The 42 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the FAG suffix for a sealed 6302?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6302-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×42×13 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6302-C-2HRS." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6302-2RS", "6302-2rs", "6302-C-2HRS", "6302-2RS-FAG" ], "locale_variants": {} }, { "sku": "6302-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6302-C-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 15, "D_mm": 42, "B_mm": 13, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 13.3, "static_load_kN": 5.3, "limiting_speed_rpm": 23500, "reference_speed_rpm": 19200, "weight_g": 84, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6302-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 15 by five gives the 15 mm bore; the 42 mm outside diameter and 13 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6302-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "gearboxes and speed reducers", "conveyor drives", "material-handling equipment", "industrial fans" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 15 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 6302 against the shaft shoulder while it cools so the ring cannot creep back.", "The 63xx medium series gains rating at 15 mm bore through a 42 mm OD and 13 mm width; the heavier rolling elements also trade away some speed versus a 6215.", "ZZ shields are non-contact: 6302-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6302-2RS for that.", "Do not wash 6302-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "The housing bore for the 42 mm OD should be round within IT7; an oval bore pinches the outer ring of 6302-ZZ-FAG and shows up later as two-point loaded raceway wear.", "Vibration during standstill brinells the raceways of a 15 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Schaeffler HR 1 lists the shielded version as 6302-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "FAG rates 6302 at 23500 r/min mechanical limiting speed (thermal reference speed 19200 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 15 mm bore the 6302 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6302 at 13.3 kN dynamic (C) and 5.3 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 84 g, 6302 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 15×42×13 mm envelope of 6302 gives a D/d ratio of 2.80 and 13.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 13.3/5.3 kN load ratings, mass 84 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6302-C-2Z on the 15×42×13 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6302 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units." ], "faq": [ { "q": "What are the dimensions of a 6302-ZZ-FAG bearing?", "a": "A 6302-ZZ-FAG deep-groove ball bearing has a 15 mm bore, 42 mm outer diameter and 13 mm width (0.591 × 1.654 × 0.512 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "Are 6302 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6302 uses the same ISO 15 envelope (15×42×13 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6302-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 6302-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6302 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 6302?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6302-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 15×42×13 mm ISO 15 envelope." }, { "q": "Does FAG offer 6302 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6302-C-2Z for normal duty." } ], "cross_ref": [ { "equiv_sku": "6302-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6302-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6302", "equiv_brand": "SKF", "level": "partial", "note": "Same 15×42×13 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=244", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6302-ZZ", "6302-zz", "6302-C-2Z", "6302-ZZ-FAG" ], "locale_variants": {} }, { "sku": "61803-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61803", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.23, "static_load_kN": 1.46, "limiting_speed_rpm": 41500, "reference_speed_rpm": 17100, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61803 carries bore code 17 = 17 mm. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 17 mm bore the ring mass is significant: heat 61803 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 17 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.", "Storage matters for open bearings: 61803-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61803 units.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Never mix components between two 61803-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 61803 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 41500 r/min mechanical limiting speed puts 61803 at the top of the HR 1 deep-groove speed range (thermal reference speed 17100 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 61803 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.23 kN dynamic load rating (C) and 1.46 kN static (C0), 61803 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 8 g, 61803 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×26×5 mm envelope of 61803 gives a D/d ratio of 1.53 and 4.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.", "The 2.23/1.46 kN load ratings, mass 8 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61803-FAG on the 17×26×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61803 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61803: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 61803; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 61803-FAG bearing?", "a": "A 61803-FAG deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 61803 mean?", "a": "A bare 61803 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 61800 compare with other series at the same 17 mm bore?", "a": "618 is an extra-thin section: 26×5 mm, only 4.5 mm radial section at 17 mm bore, far smaller than a 6217, for space-limited layouts at the cost of load rating and misalignment tolerance." }, { "q": "What is the FAG order number for an open 61803?", "a": "FAG lists the open 61803 under the bare designation 61803-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 17 mm bore envelope." }, { "q": "Does FAG offer 61803 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61803-FAG for normal duty." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61803", "61803-FAG" ], "locale_variants": {} }, { "sku": "61803-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61803-2RSR", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.23, "static_load_kN": 1.46, "limiting_speed_rpm": 13500, "weight_g": 8, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61803 carries bore code 17 = 17 mm. Outside diameter 26 mm and width 5 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61803-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "robotics and automation joints", "lay shafts and idler shafts", "textile machinery", "packaging machinery" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 17 mm bore the ring mass is significant: heat 61803 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 17 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.", "Contact seals add drag and heat: 61803-2RS-FAG runs slower and cooler-limited than the open 61803; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61803-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Deep-groove ball bearings tolerate only minutes of misalignment; if the 26 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61803-2RS-FAG.", "The housing bore for the 26 mm OD should be round within IT7; an oval bore pinches the outer ring of 61803-2RS-FAG and shows up later as two-point loaded raceway wear.", "Schaeffler HR 1 lists the lip-contact sealed version as 61803-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61803 at 13500 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 17 mm bore the 61803 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.23 kN dynamic load rating (C) and 1.46 kN static (C0), 61803 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 8 g, 61803 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×26×5 mm envelope of 61803 gives a D/d ratio of 1.53 and 4.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.", "The 2.23/1.46 kN load ratings, mass 8 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61803-2RSR on the 17×26×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61803 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61803 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61803: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61803-2RS-FAG bearing?", "a": "A 61803-2RS-FAG deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 61803 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 61803 uses the same ISO 15 envelope (17×26×5 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 61803-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 61803-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61803 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 61803?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61803-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×26×5 mm ISO 15 envelope." }, { "q": "Does FAG offer 61803 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61803-2RSR for normal duty." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-2RS", "61803-2rs", "61803-2RSR", "61803-2RS-FAG" ], "locale_variants": {} }, { "sku": "61803-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61803-2Z", "series": "61800-series", "type": "deep_groove", "d_mm": 17, "D_mm": 26, "B_mm": 5, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 2.23, "static_load_kN": 1.46, "limiting_speed_rpm": 35000, "reference_speed_rpm": 17100, "weight_estimated": true, "standard": "ISO 15", "naming_rule_text": "61803-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 26 mm outside diameter and 5 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61803-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "lay shafts and idler shafts", "textile machinery", "packaging machinery", "space-constrained gearboxes" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 17 mm of 61803-ZZ-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "Only 4.5 mm of radial section separates bore and OD on the 618xx series at 17 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.", "Do not wash 61803-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61803-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 5 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "The housing bore for the 26 mm OD should be round within IT7; an oval bore pinches the outer ring of 61803-ZZ-FAG and shows up later as two-point loaded raceway wear.", "Schaeffler HR 1 lists the shielded version as 61803-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 35000 r/min mechanical limiting speed puts 61803 at the top of the HR 1 deep-groove speed range (thermal reference speed 17100 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 61803 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 2.23 kN dynamic load rating (C) and 1.46 kN static (C0), 61803 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "The 17×26×5 mm envelope of 61803 gives a D/d ratio of 1.53 and 4.5 mm radial section height — a thin FAG section that saves space but is sensitive to misalignment and shock; keep the housing round within IT7 and the shaft deflection below the raceway contact envelope.", "The 2.23/1.46 kN load ratings here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61803-2Z on the 17×26×5 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61803 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61803: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61803-ZZ-FAG bearing?", "a": "A 61803-ZZ-FAG deep-groove ball bearing has a 17 mm bore, 26 mm outer diameter and 5 mm width (0.669 × 1.024 × 0.197 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 61803 bore code work?", "a": "The last two digits of 61803 are bore code 17, giving 17 × 5 = 17 mm bore. The 26 mm outside diameter and 5 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the ZZ suffix on 61803-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "What is the FAG suffix for a sealed 61803?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61803-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×26×5 mm ISO 15 envelope." }, { "q": "Does FAG offer 61803 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 61803-2Z for normal duty." } ], "cross_ref": [ { "equiv_sku": "61803-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61803-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61803-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×26×5 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61803-ZZ", "61803-zz", "61803-2Z", "61803-ZZ-FAG" ], "locale_variants": {} }, { "sku": "61903-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61903", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.59, "static_load_kN": 2.56, "limiting_speed_rpm": 34500, "reference_speed_rpm": 17800, "weight_g": 14, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61903 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 17 mm of 61903-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Storage matters for open bearings: 61903-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 61900-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61903 units.", "Never mix components between two 61903-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The housing bore for the 30 mm OD should be round within IT7; an oval bore pinches the outer ring of 61903-FAG and shows up later as two-point loaded raceway wear.", "The open 61903 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 34500 r/min mechanical limiting speed puts 61903 at the top of the HR 1 deep-groove speed range (thermal reference speed 17800 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 61903 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 4.59 kN dynamic load rating (C) and 2.56 kN static (C0), 61903 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 14 g, 61903 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×30×7 mm envelope of 61903 gives a D/d ratio of 1.76 and 6.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 4.59/2.56 kN load ratings, mass 14 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61903-FAG on the 17×30×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61903 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 61903 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 61903-FAG bearing?", "a": "A 61903-FAG deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How does the 61903 bore code work?", "a": "The last two digits of 61903 are bore code 17, giving 17 × 5 = 17 mm bore. The 30 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does no suffix on 61903 mean?", "a": "A bare 61903 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "What is the FAG order number for an open 61903?", "a": "FAG lists the open 61903 under the bare designation 61903-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 17 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 61903-FAG." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61903", "61903-FAG" ], "locale_variants": {} }, { "sku": "61903-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61903-2RSR", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.59, "static_load_kN": 2.56, "limiting_speed_rpm": 12700, "weight_g": 20, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 61900-series (diameter series 9 of ISO 15) the last two digits encode the bore: 61903 carries bore code 17 = 17 mm. Outside diameter 30 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 61903-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "textile machinery", "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 619xx thin section (6.5 mm section height at 17 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.", "Contact seals add drag and heat: 61903-2RS-FAG runs slower and cooler-limited than the open 61903; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 61903-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "The housing bore for the 30 mm OD should be round within IT7; an oval bore pinches the outer ring of 61903-2RS-FAG and shows up later as two-point loaded raceway wear.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 61903-2RS-FAG.", "Schaeffler HR 1 lists the lip-contact sealed version as 61903-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 61903 at 12700 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 17 mm bore the 61903 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 4.59 kN dynamic load rating (C) and 2.56 kN static (C0), 61903 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 20 g, 61903 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×30×7 mm envelope of 61903 gives a D/d ratio of 1.76 and 6.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 4.59/2.56 kN load ratings, mass 20 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61903-2RSR on the 17×30×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61903 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61903: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 61903-2RS-FAG bearing?", "a": "A 61903-2RS-FAG deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How should 61903-2RS-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61903-2RS-FAG need?", "a": "61903-2RS-FAG is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61903 with a housing grease fitting instead." }, { "q": "What is the FAG suffix for a sealed 61903?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61903-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×30×7 mm ISO 15 envelope." }, { "q": "Is 61903-2RSR an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61903-2RS", "61903-2rs", "61903-2RSR", "61903-2RS-FAG" ], "locale_variants": {} }, { "sku": "61903-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 61903-2Z", "series": "61900-series", "type": "deep_groove", "d_mm": 17, "D_mm": 30, "B_mm": 7, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 4.59, "static_load_kN": 2.56, "limiting_speed_rpm": 29000, "reference_speed_rpm": 17800, "weight_g": 17, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "61903-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 30 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 61903-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "packaging machinery", "space-constrained gearboxes", "clutch and transmission assemblies", "robotics and automation joints" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 17 mm bore the ring mass is significant: heat 61903 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 619xx thin section at 17 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.", "Do not wash 61903-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 61903-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61900-series position can soften the mixture and leak — clean out the old fill before switching grease types.", "Never mix components between two 61903-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Schaeffler HR 1 lists the shielded version as 61903-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 29000 r/min mechanical limiting speed puts 61903 at the top of the HR 1 deep-groove speed range (thermal reference speed 17800 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 61903 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 4.59 kN dynamic load rating (C) and 2.56 kN static (C0), 61903 is a light-load FAG bearing: L10 life above a few kN of equivalent load is short, so size up to a 62-series on the same bore if the duty sees shock or frequent starts.", "At only 17 g, 61903 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×30×7 mm envelope of 61903 gives a D/d ratio of 1.76 and 6.5 mm radial section height — a standard FAG medium section balancing load capacity and speed; the standard cage is adequate up to the listed speeds and C3 clearance is the common hot-shaft choice.", "The 4.59/2.56 kN load ratings, mass 17 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 61903-2Z on the 17×30×7 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 61903 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "Schaeffler's medias/eKatalog is the live source for the current execution of 61903: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 61903-ZZ-FAG bearing?", "a": "A 61903-ZZ-FAG deep-groove ball bearing has a 17 mm bore, 30 mm outer diameter and 7 mm width (0.669 × 1.181 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How should 61903-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 61903-ZZ-FAG need?", "a": "61903-ZZ-FAG is greased at the factory and the shields hold the fill for the bearing's service life; relubrication is not intended, and adding grease through the shield gap usually forces dirt in with it." }, { "q": "What is the FAG suffix for a sealed 61903?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 61903-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×30×7 mm ISO 15 envelope." }, { "q": "Is 61903-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "61903-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "61903-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W61903", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×30×7 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "61903-ZZ", "61903-zz", "61903-2Z", "61903-ZZ-FAG" ], "locale_variants": {} }, { "sku": "16003", "brand": "FAG", "manufacturer_designation": "FAG 16003", "series": "16000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6, "static_load_kN": 3.25, "limiting_speed_rpm": 31000, "reference_speed_rpm": 17700, "weight_g": 32, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "16003 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the narrow 160xx section of the ISO 15 general plan, multiplying bore code 17 by five gives the 17 mm bore; the 35 mm outside diameter and 8 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "At 17 mm bore the ring mass is significant: heat 16003 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 160xx narrow section at 17 mm bore shares the 35 mm outside diameter of the 6017 but is only 8 mm wide; a 6017 in an 8 mm-wide seat is loose axially and the reverse swap will not fit — match width as well as bore and outside diameter.", "The open 16003 has no lubricant retention: grease escapes and contaminants migrate straight into the 17×35×8 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Open bearings tolerate the highest speeds in the 16000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 16003 units.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 8 mm-wide ring of 16003 drags the lip and overheats it.", "The open 16003 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 31000 r/min mechanical limiting speed puts 16003 at the top of the HR 1 deep-groove speed range (thermal reference speed 17700 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 16003 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 16003 at 6 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 32 g, 16003 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×35×8 mm envelope of 16003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 6/3.25 kN load ratings, mass 32 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 16003 on the 17×35×8 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 16003 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 16003; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 16003 bearing?", "a": "A 16003 deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 8 mm width (0.669 × 1.378 × 0.315 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What lubrication does 16003 need?", "a": "The open 16003 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "How does the 16003 bore code work?", "a": "The last two digits of 16003 are bore code 17, giving 17 × 5 = 17 mm bore. The 35 mm outside diameter and 8 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What is the FAG order number for an open 16003?", "a": "FAG lists the open 16003 under the bare designation 16003; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 17 mm bore envelope." }, { "q": "Is 16003 an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "16003-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×35×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "16003-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×8 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "16003" ], "locale_variants": {} }, { "sku": "6003-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6003", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.4, "static_load_kN": 3.25, "limiting_speed_rpm": 31000, "reference_speed_rpm": 20300, "weight_g": 38, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6003 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "Choosing the 60xx extra-light section saves radial space at 17 mm bore, but the trade-off is rating: if the drive sees shock or frequent start-stop cycles, re-check the L10 life against a 6217 before committing to the smaller envelope.", "Storage matters for open bearings: 6003-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6000-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6003 units.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Axial location must clamp the ring face, not the seal area: a shoulder or circlip bearing on the seal side of the 10 mm-wide ring of 6003-FAG drags the lip and overheats it.", "The open 6003 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 31000 r/min mechanical limiting speed puts 6003 at the top of the HR 1 deep-groove speed range (thermal reference speed 20300 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 6003 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6003 at 6.4 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 38 g, 6003 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×35×10 mm envelope of 6003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 6.4/3.25 kN load ratings, mass 38 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6003-FAG on the 17×35×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6003 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6003: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change." ], "faq": [ { "q": "What are the dimensions of a 6003-FAG bearing?", "a": "A 6003-FAG deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting." }, { "q": "What internal clearance does 6003-FAG have?", "a": "Unless a clearance suffix says otherwise, 6003-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6003 and verify the residual clearance after mounting." }, { "q": "What is the FAG order number for an open 6003?", "a": "FAG lists the open 6003 under the bare designation 6003-FAG; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 17 mm bore envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6003-FAG." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6003", "6003-FAG" ], "locale_variants": {} }, { "sku": "6003-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6003-2RSR", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.4, "static_load_kN": 3.25, "limiting_speed_rpm": 11800, "weight_g": 40, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6003-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6003-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers", "hoists and winches" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "Contact seals add drag and heat: 6003-2RS-FAG runs slower and cooler-limited than the open 6003; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Heat is the enemy of the sealed 6003-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "The housing bore for the 35 mm OD should be round within IT7; an oval bore pinches the outer ring of 6003-2RS-FAG and shows up later as two-point loaded raceway wear.", "Schaeffler HR 1 lists the lip-contact sealed version as 6003-2RSR (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "At 11800 r/min mechanical limiting speed, 6003 covers general-purpose motor and pump duty; keep grease fill at 25–35% of free volume and verify the housing can dissipate the frictional heat at the thermal reference speed.", "At 17 mm bore the 6003 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6003 at 6.4 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 40 g, 6003 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×35×10 mm envelope of 6003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 6.4/3.25 kN load ratings, mass 40 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6003-2RSR on the 17×35×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6003 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler's medias/eKatalog is the live source for the current execution of 6003: cage material, seal lip design and ratings can be revised between catalogue generations without any designation change.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6003-2RS-FAG bearing?", "a": "A 6003-2RS-FAG deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What internal clearance does 6003-2RS-FAG have?", "a": "Unless a clearance suffix says otherwise, 6003-2RS-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6003 and verify the residual clearance after mounting." }, { "q": "What is the FAG suffix for a sealed 6003?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6003-2RSR), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×35×10 mm ISO 15 envelope." }, { "q": "Does FAG offer 6003 with C3 clearance?", "a": "FAG lists C3 internal clearance for most deep-groove sizes (suffix C3 follows the seal code); choose C3 for tight fits or hot shafts and stay with the standard CN clearance of 6003-2RSR for normal duty." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6003-2RS", "6003-2rs", "6003-2RSR", "6003-2RS-FAG" ], "locale_variants": {} }, { "sku": "6003-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6003-2Z", "series": "6000-series", "type": "deep_groove", "d_mm": 17, "D_mm": 35, "B_mm": 10, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 6.4, "static_load_kN": 3.25, "limiting_speed_rpm": 26000, "reference_speed_rpm": 20300, "weight_g": 37, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6003-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the extra-light 60xx section (diameter series 0 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 35 mm outside diameter and 10 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6003-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "Mount this 17 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.", "The 60xx extra-light section at 17 mm bore uses a smaller 35 mm OD than a 6217; load ratings are lower, so do not replace a failed 62-series bearing with a 60-series without re-rating the load.", "ZZ shields are non-contact: 6003-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6003-2RS for that.", "Shielded 6003-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6003-ZZ-FAG.", "Schaeffler HR 1 lists the shielded version as 6003-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "The 26000 r/min mechanical limiting speed puts 6003 at the top of the HR 1 deep-groove speed range (thermal reference speed 20300 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 6003 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6003 at 6.4 kN dynamic (C) and 3.25 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At only 37 g, 6003 is a lightweight FAG bearing that can be handled by hand; still press it onto the shaft with a sleeve against the inner ring — never through the balls or outer ring.", "The 17×35×10 mm envelope of 6003 gives a D/d ratio of 2.06 and 9.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 6.4/3.25 kN load ratings, mass 37 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6003-2Z on the 17×35×10 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6003 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6003 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units." ], "faq": [ { "q": "What are the dimensions of a 6003-ZZ-FAG bearing?", "a": "A 6003-ZZ-FAG deep-groove ball bearing has a 17 mm bore, 35 mm outer diameter and 10 mm width (0.669 × 1.378 × 0.394 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "How does the 6000 compare with other series at the same 17 mm bore?", "a": "The second digit is the diameter series: 60 is the smallest standard section (35×10 mm, 9.0 mm radial section) at 17 mm bore — below 62/63/64 in load capacity, for light loads in compact spaces." }, { "q": "Are 6003 bearings from different brands interchangeable?", "a": "For boundary dimensions, yes: every brand's 6003 uses the same ISO 15 envelope (17×35×10 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU, 2RSL and similar)." }, { "q": "What is the FAG suffix for a sealed 6003?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6003-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×35×10 mm ISO 15 envelope." }, { "q": "Is 6003-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6003-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6003-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6003", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×35×10 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6003-ZZ", "6003-zz", "6003-2Z", "6003-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6203-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6203-C", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11, "static_load_kN": 4.75, "limiting_speed_rpm": 29000, "reference_speed_rpm": 20100, "weight_g": 61, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6203 carries bore code 17 = 17 mm. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "hoists and winches", "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "fretting corrosion on a loose shaft seat", "cage damage from operation beyond the limiting speed" ], "pitfalls": [ "At 17 mm bore the ring mass is significant: heat 6203 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "Storage matters for open bearings: 6203-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Open bearings tolerate the highest speeds in the 6200-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 6203 units.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Never mix components between two 6203-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6203 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "The 29000 r/min mechanical limiting speed puts 6203 at the top of the HR 1 deep-groove speed range (thermal reference speed 20100 r/min); at these speeds cage design and grease shear dominate — run open with oil-mist or air-over-oil lubrication and verify the thermal reference speed for the actual load before committing.", "At 17 mm bore the 6203 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6203 at 11 kN dynamic (C) and 4.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 61 g, 6203 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 17×40×12 mm envelope of 6203 gives a D/d ratio of 2.35 and 11.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 11/4.75 kN load ratings, mass 61 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6203-C on the 17×40×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6203 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6203 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6203; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6203-FAG bearing?", "a": "A 6203-FAG deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "What does no suffix on 6203 mean?", "a": "A bare 6203 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with an 11.5 mm radial section at 17 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the FAG order number for an open 6203?", "a": "FAG lists the open 6203 under the bare designation 6203-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 17 mm bore envelope." }, { "q": "Is 6203-C an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6203", "6203-C", "6203-FAG" ], "locale_variants": {} }, { "sku": "6203-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6203-C-2HRS", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11, "static_load_kN": 4.75, "limiting_speed_rpm": 16900, "weight_g": 66, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6203-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the light 62xx section (diameter series 2 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 40 mm outside diameter and 12 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogues the lip-contact sealed version as 6203-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "false brinelling from vibration while the shaft is stationary", "fretting corrosion on a loose shaft seat" ], "pitfalls": [ "Large bores like the 17 mm of 6203-2RS-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "At 17 mm bore the 62xx light series is the workhorse section; its 40×12 mm envelope is what most motor and gearbox seats are machined for, so any alternative section must be checked against both this OD and this width, not the bore alone.", "Contact seals add drag and heat: 6203-2RS-FAG runs slower and cooler-limited than the open 6203; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.", "Never wash a sealed 6203-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Never mix components between two 6203-2RS-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Schaeffler HR 1 lists the lip-contact sealed version as 6203-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6203 at 16900 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 17 mm bore the 6203 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6203 at 11 kN dynamic (C) and 4.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 66 g, 6203 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 17×40×12 mm envelope of 6203 gives a D/d ratio of 2.35 and 11.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 11/4.75 kN load ratings, mass 66 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6203-C-2HRS on the 17×40×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6203 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units.", "Mixing old and new FAG generations of the same designation in one arrangement is dimensionally acceptable, but where ratings matter — preloaded or matched sets — order both positions from the same generation and lot." ], "faq": [ { "q": "What are the dimensions of a 6203-2RS-FAG bearing?", "a": "A 6203-2RS-FAG deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6203 bore code work?", "a": "The last two digits of 6203 are bore code 17, giving 17 × 5 = 17 mm bore. The 40 mm outside diameter and 12 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6203-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the FAG suffix for a sealed 6203?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6203-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×40×12 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6203-C-2HRS." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6203-2RS", "6203-2rs", "6203-C-2HRS", "6203-2RS-FAG" ], "locale_variants": {} }, { "sku": "6203-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6203-C-2Z", "series": "6200-series", "type": "deep_groove", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 11, "static_load_kN": 4.75, "limiting_speed_rpm": 24600, "reference_speed_rpm": 20100, "weight_g": 67, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6200-series (diameter series 2 of ISO 15) the last two digits encode the bore: 6203 carries bore code 17 = 17 mm. Outside diameter 40 mm and width 12 mm come from the ISO 15 boundary-dimensions general plan. Suffix -ZZ denotes two non-contact metallic shields; they retain grease and block coarse debris but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogue order number: 6203-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "large gearboxes", "industrial fans and blowers", "hoists and winches", "heavy conveyors" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "electrical pitting in VFD-driven motors without grounding protection", "raceway smearing under marginal lubrication at start-up" ], "pitfalls": [ "At 17 mm bore the ring mass is significant: heat 6203 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 62xx light series is the default general-purpose section at 17 mm bore; before upgrading to a 6317 for extra capacity, confirm the housing accepts a 40 mm OD and 12 mm width — it is not a drop-in swap.", "ZZ shields are non-contact: 6203-ZZ-FAG blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6203-2RS for that.", "Shielded 6203-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Shaft and housing fillets must clear the bearing chamfer so the 12 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.", "Assign fits by which ring rotates: an interference shaft fit for a rotating inner ring; if the outer ring rotates instead, reverse the logic — a loose rotating ring creeps and frets its seat.", "Schaeffler HR 1 lists the shielded version as 6203-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "FAG rates 6203 at 24600 r/min mechanical limiting speed (thermal reference speed 20100 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 17 mm bore the 6203 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "FAG rates 6203 at 11 kN dynamic (C) and 4.75 kN static (C0); this light-to-medium rating suits fractional-horsepower drives and instruments — verify the equivalent dynamic load stays well below C for conveying or gearbox duty with shock.", "At 67 g, 6203 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 17×40×12 mm envelope of 6203 gives a D/d ratio of 2.35 and 11.5 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 11/4.75 kN load ratings, mass 67 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6203-C-2Z on the 17×40×12 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6203 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6203 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock." ], "faq": [ { "q": "What are the dimensions of a 6203-ZZ-FAG bearing?", "a": "A 6203-ZZ-FAG deep-groove ball bearing has a 17 mm bore, 40 mm outer diameter and 12 mm width (0.669 × 1.575 × 0.472 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What does the ZZ suffix on 6203-ZZ mean?", "a": "ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing." }, { "q": "How does the 6200 compare with other series at the same 17 mm bore?", "a": "The '2' is the light diameter series: 40×12 mm with an 11.5 mm radial section at 17 mm bore. A 6317 on the same bore is larger and higher-rated; a 6017 is smaller and lower-rated." }, { "q": "What is the FAG suffix for a sealed 6203?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6203-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×40×12 mm ISO 15 envelope." }, { "q": "Is 6203-C-2Z an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6203-2RS-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6203-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6203", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×40×12 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6203-ZZ", "6203-zz", "6203-C-2Z", "6203-ZZ-FAG" ], "locale_variants": {} }, { "sku": "6303-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6303-C", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.8, "static_load_kN": 6.5, "limiting_speed_rpm": 24500, "reference_speed_rpm": 17400, "weight_g": 114, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6303 carries bore code 17 = 17 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the Schaeffler HR 1 catalogue this open execution carries the bare designation; protected variants are ordered separately with suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals).", "applications": [ "heavy conveyors", "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes" ], "failure_modes": [ "contamination wear from dust and dirt ingress through the open arrangement", "lubricant starvation when no regreasing interval is maintained", "raceway smearing under marginal lubrication at start-up", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Large bores like the 17 mm of 6303-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium section at 17 mm bore gains dynamic rating through larger rolling elements on a 47 mm OD; the penalty is mass and a lower limiting speed than the 6217 — do not specify it for speed-critical shafts.", "The open 6303-FAG has no lubricant retention: grease escapes and contaminants migrate straight into the 17×47×14 mm raceway, so specify a sealed arrangement for dusty or washdown duty.", "Storage matters for open bearings: 6303-FAG leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6303-FAG.", "Never mix components between two 6303-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "The open 6303 has no integral sealing; in the Schaeffler HR 1 catalogue the protected variants carry suffixes 2Z (two steel shields), 2RZ (two non-contact rubber seals) and 2RSR (two lip-contact rubber seals). Do not confuse FAG's 2RZ with a contact seal — the RZ lip does not touch the inner ring, which is why its speed capability stays close to the open bearing.", "FAG rates 6303 at 24500 r/min mechanical limiting speed (thermal reference speed 17400 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 17 mm bore the 6303 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 15.8 kN dynamic load rating (C) and 6.5 kN static (C0), 6303 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.", "At 114 g, 6303 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 17×47×14 mm envelope of 6303 gives a D/d ratio of 2.76 and 15.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 15.8/6.5 kN load ratings, mass 114 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6303-C on the 17×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6303 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6303 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6303; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6303-FAG bearing?", "a": "A 6303-FAG deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields." }, { "q": "How should 6303-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What lubrication does 6303-FAG need?", "a": "The open 6303-FAG is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval." }, { "q": "What is the FAG order number for an open 6303?", "a": "FAG lists the open 6303 under the bare designation 6303-C; protected versions use suffixes 2Z (steel shields), 2RZ (non-contact rubber seals) and 2RSR (lip-contact rubber seals) on the same 17 mm bore envelope." }, { "q": "Is 6303-C an X-life bearing?", "a": "Many HR 1 sizes have transitioned to the X-life generation in current production; the eKatalog entry for the designation shows the present generation and its ratings. Boundary dimensions do not change between generations." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6303", "6303-C", "6303-FAG" ], "locale_variants": {} }, { "sku": "6303-2RS-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6303-C-2HRS", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.8, "static_load_kN": 6.5, "limiting_speed_rpm": 15700, "weight_g": 118, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "In the 6300-series (diameter series 3 of ISO 15) the last two digits encode the bore: 6303 carries bore code 17 = 17 mm. Outside diameter 47 mm and width 14 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 17 mm shaft, typical catalogue practice is a j5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. Schaeffler HR 1 catalogues the lip-contact sealed version as 6303-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "seal-lip hardening and loss of pre-grease in sustained high-temperature service", "grease-life expiry in the sealed-for-life cavity (no relubrication path)", "cage damage from operation beyond the limiting speed", "electrical pitting in VFD-driven motors without grounding protection" ], "pitfalls": [ "At 17 mm bore the ring mass is significant: heat 6303 on an induction heater (max 120 °C), never over an open flame, and plan puller access or a withdrawal sleeve now for the day it has to come off again.", "The 63xx medium section at 17 mm bore gains dynamic rating through larger rolling elements on a 47 mm OD; the penalty is mass and a lower limiting speed than the 6217 — do not specify it for speed-critical shafts.", "Heat is the enemy of the sealed 6303-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.", "Never wash a sealed 6303-2RS-FAG in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.", "Measure the shaft, do not trust the drawing: a 17 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6303-2RS-FAG.", "Suffixes stack in a defined order — clearance follows the seal code, e.g. 6303-2RS-FAG-C3. No clearance suffix means normal CN clearance.", "Schaeffler HR 1 lists the lip-contact sealed version as 6303-C-2HRS (FAG suffix 2RSR), mapped here from the industry-neutral -2RS spelling; it is greased for life and the contacting lip lowers the speed ceiling versus the open bearing. FAG's RSR lip material is NBR as standard — above roughly 100 °C continuous, consult Schaeffler for higher-temperature seal options.", "FAG rates 6303 at 15700 r/min mechanical limiting speed — electric-motor territory; prefer the open or 2Z execution (sealed 2RSR variants lose roughly a third of the thermal speed) and confirm grease life at the reference speed for continuous running.", "At 17 mm bore the 6303 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 15.8 kN dynamic load rating (C) and 6.5 kN static (C0), 6303 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.", "At 118 g, 6303 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 17×47×14 mm envelope of 6303 gives a D/d ratio of 2.76 and 15.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 15.8/6.5 kN load ratings, mass 118 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6303-C-2HRS on the 17×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6303 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "FAG standard tolerance for this size is P0 (PN); P6/P5 precision executions exist for spindle-adjacent duty but carry different order numbers in the Schaeffler system — they are not a selectable sorting of standard stock.", "For hot shafts above roughly 100 °C continuous, consult Schaeffler about seal material and grease options for the 2RSR execution of 6303; the standard NBR lip is the economical general-duty choice, not the high-temperature one." ], "faq": [ { "q": "What are the dimensions of a 6303-2RS-FAG bearing?", "a": "A 6303-2RS-FAG deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased." }, { "q": "How does the 6303 bore code work?", "a": "The last two digits of 6303 are bore code 17, giving 17 × 5 = 17 mm bore. The 47 mm outside diameter and 14 mm width follow the ISO 15 diameter series, not the bore code alone." }, { "q": "What does the 2RS suffix on 6303-2RS mean?", "a": "2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling." }, { "q": "What is the FAG suffix for a sealed 6303?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6303-C-2HRS), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×47×14 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6303-C-2HRS." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6303-2RS", "6303-2rs", "6303-C-2HRS", "6303-2RS-FAG" ], "locale_variants": {} }, { "sku": "6303-ZZ-FAG", "brand": "FAG", "manufacturer_designation": "FAG 6303-C-2Z", "series": "6300-series", "type": "deep_groove", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "ZZ", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 15.8, "static_load_kN": 6.5, "limiting_speed_rpm": 20800, "reference_speed_rpm": 17400, "weight_g": 117, "weight_estimated": false, "standard": "ISO 15", "naming_rule_text": "6303-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the medium 63xx section (diameter series 3 of ISO 15), multiplying bore code 17 by five gives the 17 mm bore; the 47 mm outside diameter and 14 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 17 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. Schaeffler HR 1 catalogue order number: 6303-C-2Z (FAG suffix 2Z), two non-contact steel shields, mapped here from the industry-neutral -ZZ spelling.", "applications": [ "pulp and paper machinery", "medium and heavy industrial drives", "large gearboxes", "industrial fans and blowers" ], "failure_modes": [ "fine-particle abrasion when non-contact shields let dust past in dirty duty", "grease aging in the shield-for-life cavity with no relubrication path", "rolling-contact fatigue spalling after the rated L10 life is exceeded", "brinelling from static overload or hammering during mounting" ], "pitfalls": [ "Large bores like the 17 mm of 6303-ZZ-FAG demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.", "The 63xx medium series gains rating at 17 mm bore through a 47 mm OD and 14 mm width; the heavier rolling elements also trade away some speed versus a 6217.", "Do not wash 6303-ZZ-FAG in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.", "Shielded 6303-ZZ-FAG units are typically greased for life; prying the shields out for regreasing usually bends them and leaves a gap that throws grease in service.", "Never mix components between two 6303-ZZ-FAG units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.", "Vibration during standstill brinells the raceways of a 17 mm bearing at ball spacing; if the machine sits idle next to running equipment, turn the shaft over periodically or isolate the arrangement.", "Schaeffler HR 1 lists the shielded version as 6303-C-2Z — FAG suffix 2Z, two non-contact steel shields. The industry-neutral page spelling is -ZZ; quote the FAG order number when buying through a Schaeffler channel.", "FAG rates 6303 at 20800 r/min mechanical limiting speed (thermal reference speed 17400 r/min) — a high-speed range where the thermal reference speed governs continuous duty; use low-viscosity turbine oil or high-speed grease and avoid lip-contact seals entirely.", "At 17 mm bore the 6303 sits in Schaeffler's small-bore range; HR 1 ships these sizes with a pressed steel or plastic cage and P0 tolerance as standard — for instrument or spindle accuracy order the P6/P5 variant explicitly, since P0 runout figures will not hold.", "At 15.8 kN dynamic load rating (C) and 6.5 kN static (C0), 6303 is a medium-load FAG bearing for most electric-motor and pump duty; check the static safety factor against C0 for preloaded or thrust-loaded arrangements.", "At 117 g, 6303 is light enough for hand assembly but should be pressed on with a fitting sleeve against the inner ring; do not strike the outer ring or cage with a hammer.", "The 17×47×14 mm envelope of 6303 gives a D/d ratio of 2.76 and 15.0 mm radial section height — a heavy FAG section for high-load, lower-speed duty; specifying it in a high-rpm motor generates excess heat and shortens grease life, so prefer a 62/63-series there.", "The 15.8/6.5 kN load ratings, mass 117 g here are Schaeffler HR 1 Rolling Bearings (Jan 2020) catalogue figures for 6303-C-2Z on the 17×47×14 mm ISO 15 envelope; internal geometry and ratings legitimately differ between brands, so re-verify before substituting another manufacturer's 6303 in a rated drive. Where FAG has since released an X-life version of this size, its expanded C/C0 ratings supersede the HR 1 print values quoted here.", "Schaeffler has moved many HR 1 sizes to the X-life generation with higher C/C0 ratings; the designation is unchanged, so a current eKatalog listing for 6303 may quote higher values than the HR 1 print figures on this page — the envelope is identical either way.", "FAG sealed units arrive greased for life with a lithium-soap fill; Schaeffler quotes a shelf life for greased bearings and recommends running stock first-in-first-out rather than re-greasing aged sealed units." ], "faq": [ { "q": "What are the dimensions of a 6303-ZZ-FAG bearing?", "a": "A 6303-ZZ-FAG deep-groove ball bearing has a 17 mm bore, 47 mm outer diameter and 14 mm width (0.669 × 1.85 × 0.551 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields." }, { "q": "What internal clearance does 6303-ZZ-FAG have?", "a": "Unless a clearance suffix says otherwise, 6303-ZZ-FAG is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 6303 and verify the residual clearance after mounting." }, { "q": "How should 6303-ZZ-FAG be mounted?", "a": "Apply the mounting force to the ring being fitted: on a 17 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals." }, { "q": "What is the FAG suffix for a sealed 6303?", "a": "FAG uses suffix 2RSR for the lip-contact rubber seal (catalogue number 6303-C-2Z), 2RZ for the non-contact rubber seal and 2Z for steel shields. The industry-neutral spellings on this page (-2RS / -RSR / -ZZ) map to those FAG suffixes while keeping the 17×47×14 mm ISO 15 envelope." }, { "q": "What is the difference between FAG 2RZ and 2RSR seals?", "a": "2RZ is a non-contact rubber seal: minimal drag, speed close to the open bearing, not liquid-tight. 2RSR is a lip-contact seal: better protection against moisture and fine dust at the cost of speed and torque. Both keep the ISO 15 envelope of 6303-C-2Z." } ], "cross_ref": [ { "equiv_sku": "6303-2RS", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ-NSK", "equiv_brand": "NSK", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-NSK", "equiv_brand": "NSK", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-2RS-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ-NTN", "equiv_brand": "NTN", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-ZZ", "equiv_brand": "SKF", "level": "full", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "6303-RSR", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303-2RS", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303-ZZ", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." }, { "equiv_sku": "W6303", "equiv_brand": "SKF", "level": "partial", "note": "Same 17×47×14 mm envelope per ISO 15; seal variant and load ratings may differ — confirm sealing and rating before substituting." } ], "source_ref": "https://www.schaeffler.it/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/catalogue_1/downloads_6/hr1_de_en.pdf#page=246", "catalog_ver": "HR 1 Rolling Bearings (Jan 2020)", "extracted_at": "2026-09-25", "last_verified": "2026-09-25", "confidence_score": 0.7, "status": "published", "aliases": [ "6303-ZZ", "6303-zz", "6303-C-2Z", "6303-ZZ-FAG" ], "locale_variants": {} } ]